r4/dischord
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

init

Browse Source
This commit is contained in:
r4 2022-09-20 00:54:22 +02:00
commit 4195b20e65
33 changed files with 6397 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
DEBIAN/conffiles Normal file
View File

@ -0,0 +1 @@
/etc/dischord/config.json

6
DEBIAN/control Normal file
View File

@ -0,0 +1,6 @@
Package: dischord
Version: 0.1
Maintainer: r4
Architecture: amd64
Description: Discord music bot, supports YouTube, Spotify and many other sites
Depends: youtube-dl, ffmpeg

5
DEBIAN/postinst Executable file
View File

@ -0,0 +1,5 @@
#!/usr/bin/env sh
cd /etc/dischord
dischord -wizard -quit_after_wizard
cd -
systemctl enable --now dischord.service

2
DEBIAN/prerm Executable file
View File

@ -0,0 +1,2 @@
#!/usr/bin/env sh
systemctl disable --now dischord.service || true

674
LICENSE Normal file
View File

@ -0,0 +1,674 @@
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights. Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received. You must make sure that they, too, receive
or can get the source code. And you must show them these terms so they
know their rights.
Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software. For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.
Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so. This is fundamentally incompatible with the aim of
protecting users' freedom to change the software. The systematic
pattern of such abuse occurs in the area of products for individuals to
use, which is precisely where it is most unacceptable. Therefore, we
have designed this version of the GPL to prohibit the practice for those
products. If such problems arise substantially in other domains, we
stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and
modification follow.
TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
"The Program" refers to any copyrightable work licensed under this
License. Each licensee is addressed as "you". "Licensees" and
"recipients" may be individuals or organizations.
To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.
A "covered work" means either the unmodified Program or a work based
on the Program.
To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy. Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.
To "convey" a work means any kind of propagation that enables other
parties to make or receive copies. Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.
An interactive user interface displays "Appropriate Legal Notices"
to the extent that it includes a convenient and prominently visible
feature that (1) displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License. If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.
1. Source Code.
The "source code" for a work means the preferred form of the work
for making modifications to it. "Object code" means any non-source
form of a work.
A "Standard Interface" means an interface that either is an official
standard defined by a recognized standards body, or, in the case of
interfaces specified for a particular programming language, one that
is widely used among developers working in that language.
The "System Libraries" of an executable work include anything, other
than the work as a whole, that (a) is included in the normal form of
packaging a Major Component, but which is not part of that Major
Component, and (b) serves only to enable use of the work with that
Major Component, or to implement a Standard Interface for which an
implementation is available to the public in source code form. A
"Major Component", in this context, means a major essential component
(kernel, window system, and so on) of the specific operating system
(if any) on which the executable work runs, or a compiler used to
produce the work, or an object code interpreter used to run it.
The "Corresponding Source" for a work in object code form means all
the source code needed to generate, install, and (for an executable
work) run the object code and to modify the work, including scripts to
control those activities. However, it does not include the work's
System Libraries, or general-purpose tools or generally available free
programs which are used unmodified in performing those activities but
which are not part of the work. For example, Corresponding Source
includes interface definition files associated with source files for
the work, and the source code for shared libraries and dynamically
linked subprograms that the work is specifically designed to require,
such as by intimate data communication or control flow between those
subprograms and other parts of the work.
The Corresponding Source need not include anything that users
can regenerate automatically from other parts of the Corresponding
Source.
The Corresponding Source for a work in source code form is that
same work.
2. Basic Permissions.
All rights granted under this License are granted for the term of
copyright on the Program, and are irrevocable provided the stated
conditions are met. This License explicitly affirms your unlimited
permission to run the unmodified Program. The output from running a
covered work is covered by this License only if the output, given its
content, constitutes a covered work. This License acknowledges your
rights of fair use or other equivalent, as provided by copyright law.
You may make, run and propagate covered works that you do not
convey, without conditions so long as your license otherwise remains
in force. You may convey covered works to others for the sole purpose
of having them make modifications exclusively for you, or provide you
with facilities for running those works, provided that you comply with
the terms of this License in conveying all material for which you do
not control copyright. Those thus making or running the covered works
for you must do so exclusively on your behalf, under your direction
and control, on terms that prohibit them from making any copies of
your copyrighted material outside their relationship with you.
Conveying under any other circumstances is permitted solely under
the conditions stated below. Sublicensing is not allowed; section 10
makes it unnecessary.
3. Protecting Users' Legal Rights From Anti-Circumvention Law.
No covered work shall be deemed part of an effective technological
measure under any applicable law fulfilling obligations under article
11 of the WIPO copyright treaty adopted on 20 December 1996, or
similar laws prohibiting or restricting circumvention of such
measures.
When you convey a covered work, you waive any legal power to forbid
circumvention of technological measures to the extent such circumvention
is effected by exercising rights under this License with respect to
the covered work, and you disclaim any intention to limit operation or
modification of the work as a means of enforcing, against the work's
users, your or third parties' legal rights to forbid circumvention of
technological measures.
4. Conveying Verbatim Copies.
You may convey verbatim copies of the Program's source code as you
receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice;
keep intact all notices stating that this License and any
non-permissive terms added in accord with section 7 apply to the code;
keep intact all notices of the absence of any warranty; and give all
recipients a copy of this License along with the Program.
You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.
5. Conveying Modified Source Versions.
You may convey a work based on the Program, or the modifications to
produce it from the Program, in the form of source code under the
terms of section 4, provided that you also meet all of these conditions:
a) The work must carry prominent notices stating that you modified
it, and giving a relevant date.
b) The work must carry prominent notices stating that it is
released under this License and any conditions added under section
7. This requirement modifies the requirement in section 4 to
"keep intact all notices".
c) You must license the entire work, as a whole, under this
License to anyone who comes into possession of a copy. This
License will therefore apply, along with any applicable section 7
additional terms, to the whole of the work, and all its parts,
regardless of how they are packaged. This License gives no
permission to license the work in any other way, but it does not
invalidate such permission if you have separately received it.
d) If the work has interactive user interfaces, each must display
Appropriate Legal Notices; however, if the Program has interactive
interfaces that do not display Appropriate Legal Notices, your
work need not make them do so.
A compilation of a covered work with other separate and independent
works, which are not by their nature extensions of the covered work,
and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
"aggregate" if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.
6. Conveying Non-Source Forms.
You may convey a covered work in object code form under the terms
of sections 4 and 5, provided that you also convey the
machine-readable Corresponding Source under the terms of this License,
in one of these ways:
a) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by the
Corresponding Source fixed on a durable physical medium
customarily used for software interchange.
b) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by a
written offer, valid for at least three years and valid for as
long as you offer spare parts or customer support for that product
model, to give anyone who possesses the object code either (1) a
copy of the Corresponding Source for all the software in the
product that is covered by this License, on a durable physical
medium customarily used for software interchange, for a price no
more than your reasonable cost of physically performing this
conveying of source, or (2) access to copy the
Corresponding Source from a network server at no charge.
c) Convey individual copies of the object code with a copy of the
written offer to provide the Corresponding Source. This
alternative is allowed only occasionally and noncommercially, and
only if you received the object code with such an offer, in accord
with subsection 6b.
d) Convey the object code by offering access from a designated
place (gratis or for a charge), and offer equivalent access to the
Corresponding Source in the same way through the same place at no
further charge. You need not require recipients to copy the
Corresponding Source along with the object code. If the place to
copy the object code is a network server, the Corresponding Source
may be on a different server (operated by you or a third party)
that supports equivalent copying facilities, provided you maintain
clear directions next to the object code saying where to find the
Corresponding Source. Regardless of what server hosts the
Corresponding Source, you remain obligated to ensure that it is
available for as long as needed to satisfy these requirements.
e) Convey the object code using peer-to-peer transmission, provided
you inform other peers where the object code and Corresponding
Source of the work are being offered to the general public at no
charge under subsection 6d.
A separable portion of the object code, whose source code is excluded
from the Corresponding Source as a System Library, need not be
included in conveying the object code work.
A "User Product" is either (1) a "consumer product", which means any
tangible personal property which is normally used for personal, family,
or household purposes, or (2) anything designed or sold for incorporation
into a dwelling. In determining whether a product is a consumer product,
doubtful cases shall be resolved in favor of coverage. For a particular
product received by a particular user, "normally used" refers to a
typical or common use of that class of product, regardless of the status
of the particular user or of the way in which the particular user
actually uses, or expects or is expected to use, the product. A product
is a consumer product regardless of whether the product has substantial
commercial, industrial or non-consumer uses, unless such uses represent
the only significant mode of use of the product.
"Installation Information" for a User Product means any methods,
procedures, authorization keys, or other information required to install
and execute modified versions of a covered work in that User Product from
a modified version of its Corresponding Source. The information must
suffice to ensure that the continued functioning of the modified object
code is in no case prevented or interfered with solely because
modification has been made.
If you convey an object code work under this section in, or with, or
specifically for use in, a User Product, and the conveying occurs as
part of a transaction in which the right of possession and use of the
User Product is transferred to the recipient in perpetuity or for a
fixed term (regardless of how the transaction is characterized), the
Corresponding Source conveyed under this section must be accompanied
by the Installation Information. But this requirement does not apply
if neither you nor any third party retains the ability to install
modified object code on the User Product (for example, the work has
been installed in ROM).
The requirement to provide Installation Information does not include a
requirement to continue to provide support service, warranty, or updates
for a work that has been modified or installed by the recipient, or for
the User Product in which it has been modified or installed. Access to a
network may be denied when the modification itself materially and
adversely affects the operation of the network or violates the rules and
protocols for communication across the network.
Corresponding Source conveyed, and Installation Information provided,
in accord with this section must be in a format that is publicly
documented (and with an implementation available to the public in
source code form), and must require no special password or key for
unpacking, reading or copying.
7. Additional Terms.
"Additional permissions" are terms that supplement the terms of this
License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
be treated as though they were included in this License, to the extent
that they are valid under applicable law. If additional permissions
apply only to part of the Program, that part may be used separately
under those permissions, but the entire Program remains governed by
this License without regard to the additional permissions.
When you convey a copy of a covered work, you may at your option
remove any additional permissions from that copy, or from any part of
it. (Additional permissions may be written to require their own
removal in certain cases when you modify the work.) You may place
additional permissions on material, added by you to a covered work,
for which you have or can give appropriate copyright permission.
Notwithstanding any other provision of this License, for material you
add to a covered work, you may (if authorized by the copyright holders of
that material) supplement the terms of this License with terms:
a) Disclaiming warranty or limiting liability differently from the
terms of sections 15 and 16 of this License; or
b) Requiring preservation of specified reasonable legal notices or
author attributions in that material or in the Appropriate Legal
Notices displayed by works containing it; or
c) Prohibiting misrepresentation of the origin of that material, or
requiring that modified versions of such material be marked in
reasonable ways as different from the original version; or
d) Limiting the use for publicity purposes of names of licensors or
authors of the material; or
e) Declining to grant rights under trademark law for use of some
trade names, trademarks, or service marks; or
f) Requiring indemnification of licensors and authors of that
material by anyone who conveys the material (or modified versions of
it) with contractual assumptions of liability to the recipient, for
any liability that these contractual assumptions directly impose on
those licensors and authors.
All other non-permissive additional terms are considered "further
restrictions" within the meaning of section 10. If the Program as you
received it, or any part of it, contains a notice stating that it is
governed by this License along with a term that is a further
restriction, you may remove that term. If a license document contains
a further restriction but permits relicensing or conveying under this
License, you may add to a covered work material governed by the terms
of that license document, provided that the further restriction does
not survive such relicensing or conveying.
If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in the
form of a separately written license, or stated as exceptions;
the above requirements apply either way.
8. Termination.
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and (b) permanently, if the copyright
holder fails to notify you of the violation by some reasonable means
prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License. If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.
9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
modify any covered work. These actions infringe copyright if you do
not accept this License. Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.
10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You are not responsible
for enforcing compliance by third parties with this License.
An "entity transaction" is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a covered
work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party's predecessor in interest had or could
give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if
the predecessor has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.
11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License. You may not convey a covered
work if you are a party to an arrangement with a third party that is
in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
the work, and under which the third party grants, to any of the
parties who would receive the covered work from you, a discriminatory
patent license (a) in connection with copies of the covered work
conveyed by you (or copies made from those copies), or (b) primarily
for and in connection with specific products or compilations that
contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'show c' for details.
The hypothetical commands 'show w' and 'show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

57
Makefile Normal file
View File

@ -0,0 +1,57 @@
GO = go
PREFIX = /usr/local
CFGPREFIX = /etc
EXE = dischord
all:
$(GO) build -o $(EXE) cmd/$(EXE)/*.go
debug:
$(GO) build -o $(EXE) -gcflags=all="-N -l" cmd/$(EXE)/*.go
dlv exec ./dischord
install: all
mkdir -p $(DESTDIR)$(PREFIX)/bin
cp -f $(EXE) $(DESTDIR)$(PREFIX)/bin
chmod 755 $(DESTDIR)$(PREFIX)/bin/$(EXE)
mkdir -p $(DESTDIR)$(CFGPREFIX)/$(EXE)
@if command -v systemd; then \
$(MAKE) install-systemd; \
else \
@echo "Systemd not found, if you want to add $(DESTDIR)$(PREFIX)/bin/$(EXE) as a service, please do so manually."; \
fi
install-systemd:
mkdir -p $(DESTDIR)$(CFGPREFIX)/systemd/system
echo \
[Unit] \
Description=$(EXE) \
Requires=network-online.target \
After=network-online.target \
[Service] \
Type=simple \
ExecStart=$(PREFIX)/bin/$(EXE) \
WorkingDirectory=$(CFGPREFIX)/$(EXE) \
Restart=on-failure \
[Install] \
WantedBy=multi-user.target \
| sed 's/ /\n/g' > $(DESTDIR)$(CFGPREFIX)/systemd/system/$(EXE).service
uninstall:
@if command -v systemd; then \
systemctl stop $(EXE); \
systemctl disable $(EXE); \
fi
rm -f $(DESTDIR)$(PREFIX)/bin/$(EXE)
rm -f $(DESTDIR)$(CFGPREFIX)/systemd/system/$(EXE).service
test:
$(GO) test -count=1 -v $(EXE)/extractor
.PHONY: all debug install uninstall clean
clean:
rm -f $(EXE)
rm -rf build/

108
README.md Normal file
View File

@ -0,0 +1,108 @@
# Dischord
### A simple, easy-to-deploy Discord music bot written in go
### Supports YouTube, Spotify and hundreds of other sites using youtube-dl
---
## Setup
- [Windows](#windows)
- [MacOS](#macos)
- [Linux](#linux)
- [From source (BSDs etc.)](#from-source)
### Windows
#### Download .exe from releases
- [64-bit](https://github.com/xypwn/Dischord/releases/download/latest/dischord-windows-amd64.exe) (reasonably modern hardware)
- [32-bit](https://github.com/xypwn/Dischord/releases/download/latest/dischord-windows-x86.exe) (very old hardware)
#### Preparations
After you're done downloading, I would recommend putting the executable into a new
folder so your downloads don't get too cluttered, since a few more files will
be created upon running the executable.
#### Initial setup / running the .exe
To start the program, simply double click the .exe. This will bring up a command
window saying it will have to first download a few additional programs. After
it's finished downloading, edit the newly generated config.toml file and
replace the text after `token = ` with your Discord bot token, leaving the
surrounding "". After editing, the line should look something like this:
```toml
token = "dmMpDY4K8dFyqMoypaZg3QXP.QUp5Sg.e7VQhRpEfud6SajSvyFZpxZpVwwBrwNYr2L3m7"
```
Now if you start the .exe again, it should just work.
### MacOS
#### Download the executable from releases
- [Apple silicon](https://github.com/xypwn/Dischord/releases/download/latest/dischord-macos-apple-silicon) (newer models)
- [Intel hardware (untested)](https://github.com/xypwn/Dischord/releases/download/latest/dischord-macos-intel) (slightly older models)
#### Preparations
After you're done downloading, I would recommend putting the executable into a new
folder so your downloads don't get too cluttered, since a few more files will
be created upon running the executable.
In order to run the program, you will need to enable opening a terminal in
the current folder. To do so, go to
**System Preferences -> Keyboard -> Keyboard Shortcuts -> Services**
and enable
**Files and Folders -> New Terminal at Folder** and **New Terminal Tab at Folder**.
#### Initial setup / running the executable
Navigate to the folder containing your executable, right-click and select
**Services -> New Terminal at Folder**. In the command
window that opens up, type `chmod +x dischord-macos-*` and hit `Enter` (you
will only need to do this once).
Then, to run the executable, type `./dischord-macos-*` and hit `Enter`.
On the first run, it will download a few additional programs.
When it's done, open the newly generated config.toml file with a text editor
and replace the text after `token = ` with your Discord bot token, leaving the
surrounding "". After editing, the line should look something like this:
```toml
token = "dmMpDY4K8dFyqMoypaZg3QXP.QUp5Sg.e7VQhRpEfud6SajSvyFZpxZpVwwBrwNYr2L3m7"
```
Done! Now you can just run the executable and everything should work.
### Linux
#### Download the executable from releases
- [amd64/x86_64/x64](https://github.com/xypwn/Dischord/releases/download/latest/dischord-linux-amd64)
- [i386/x86](https://github.com/xypwn/Dischord/releases/download/latest/dischord-linux-x86)
- [arm64 (untested)](https://github.com/xypwn/Dischord/releases/download/latest/dischord-linux-arm64)
- [armhf/arm32 (untested)](https://github.com/xypwn/Dischord/releases/download/latest/dischord-linux-arm32)
#### Preparations
After you're done downloading, I would recommend putting the executable into a new
folder so your downloads don't get too cluttered, since a few more files will
be created upon running the executable.
#### Initial setup / running the executable
First, `cd` into the executable's directory.
Then, run `chmod +x dischord-linux-*` to make the file executable.
Run the executable with `./dischord-linux-*`.
On the first run, it will download **youtube-dl** and **FFmpeg** if they aren't
already installed on your system (for example through your package manager).
When it's done, open the newly generated config.toml file with a text editor
and replace the text after `token = ` with your Discord bot token, leaving the
surrounding "". After editing, the line should look something like this:
```toml
token = "dmMpDY4K8dFyqMoypaZg3QXP.QUp5Sg.e7VQhRpEfud6SajSvyFZpxZpVwwBrwNYr2L3m7"
```
Done! Now you can just run the executable and everything should work.
### From source (BSDs etc.)
After installing [go](https://go.dev/dl/), you can simply run the makefile to
build a native binary.
In case you are using a non-Linux OS, you will have to manually install
[youtube-dl](https://yt-dl.org/) and [FFmpeg](https://ffmpeg.org/) first before being able to run the bot.

4
TODO.md Normal file
View File

@ -0,0 +1,4 @@
- Replace the fmt.Prints in `player/player.go` with proper logging
- Add /skip
- Add expressions like -18..45 or -18..-2 to delete
- Decide on whether to keep `make install` and the Debian package template

167
audio/audio.go Normal file
View File

@ -0,0 +1,167 @@
package audio
import (
"errors"
"io"
"os"
"os/exec"
"strconv"
"strings"
"time"
"fmt"
)
const (
BufferLength = 300 // 5min / 3.6MB
Channels = 1 // unfortunately, Discord doesn't seem to support stereo at the time
BitRate = 96000
SampleRate = 48000
FrameSize = 960 // 960 samples
FrameDuration = float64(FrameSize) / float64(SampleRate) // 20ms
FramesPerSecond = SampleRate / FrameSize
)
var (
ErrNotHttp = errors.New("the requested resource is not an http/https address")
)
type frameIdx struct {
start uint
end uint
}
// Takes a file path/HTTP(S) stream URL and returns Discord audio frames through
// audioFrameCh. After audioFrameCh is closed, errCh can be read to get any
// potential error. Will cleanly kill ffmpeg if a struct{} is sent through
// killCh (IMPORTANT: only send the kill signal ONCE: there is a chance that
// this goroutine exits just before you send a kill signal; this will be
// absorbed by the channel buffer, but your program might get stuck if you try
// to send two kill signals to a dead stream).
func StreamToDiscordOpus(ffmpegPath, input string, stdin io.Reader, seekSeconds float64, playbackSpeed float64, inetOnly bool) (audioFrameCh <-chan []byte, errCh <-chan error, killCh chan<- struct{}) {
out := make(chan []byte, BufferLength*FramesPerSecond)
errch := make(chan error, 1)
killch := make(chan struct{}, 1)
go func() {
defer close(out)
defer close(errch)
if inetOnly && !(strings.HasPrefix(input, "http://") || strings.HasPrefix(input, "https://")) {
errch <- ErrNotHttp
return
}
// Set ffmpeg options
var cmdOpts []string
cmdOpts = append(cmdOpts,
"-vn", // no video
"-sn", // no subs
"-dn") // no data encoding
if seekSeconds != 0.0 {
cmdOpts = append(cmdOpts,
"-accurate_seek",
"-ss", strconv.FormatFloat(seekSeconds, 'f', 5, 64)) // seek duration
}
cmdOpts = append(cmdOpts,
"-i", input)
if playbackSpeed != 1.0 {
cmdOpts = append(cmdOpts,
"-filter:a", "atempo="+strconv.FormatFloat(playbackSpeed, 'f', 5, 64)) // playback speed
}
cmdOpts = append(cmdOpts,
"-ab", strconv.Itoa(BitRate), // audio bit rate
"-ac", strconv.Itoa(Channels), // audio channels
"-frame_size", strconv.Itoa(int(FrameDuration*1000)), // frame size (in ms)
"-f", "opus", // output OPUS audio
"pipe:1") // output to stdout
// Prepare ffmpeg command
cmd := exec.Command(ffmpegPath, cmdOpts...)
if stdin != nil {
cmd.Stdin = stdin
}
stdout, err := cmd.StdoutPipe()
if err != nil {
errch <- err
return
}
// Start ffmpeg
if err := cmd.Start(); err != nil {
errch <- err
return
}
// We want to let our main loop know if ffmpeg is done
donech := make(chan error)
go func() {
donech <- cmd.Wait()
}()
// Ogg decoder
dec := newOggDecoder(stdout)
var segDec *oggSegmentDecoder
startSegDec := false
// Avoid dropping frames
wantNewFrame := true
// Main opus encoder loop
for {
var frame []byte
for wantNewFrame {
if startSegDec && segDec.More() {
frame = make([]byte, segDec.SegmentSize())
if err := segDec.ReadSegment(frame); err != nil {
errch <- err
return
}
wantNewFrame = false
} else if dec.More() {
var err error
var hdr oggPageHeader
hdr, segDec, err = dec.Page()
if err != nil {
errch <- err
return
}
if hdr.GranulePosition != 0 {
startSegDec = true
}
} else {
out = nil
break
}
}
// Channel IO
select {
case err := <-donech:
fmt.Println("Audio done, waiting for read to finish")
if err != nil {
// Send error and exit
errch <- err
return
}
// Process exited normally, wait until all samples are read
// before closing the channels
for len(out) != 0 {
time.Sleep(20 * time.Millisecond)
}
fmt.Println("Audio read finished")
return
case <-killch:
// Process was killed by user
cmd.Process.Signal(os.Interrupt)
return
case out <- frame:
// Output is ready to receive a new frame
wantNewFrame = true
}
}
}()
return out, errch, killch
}

279
audio/ogg.go Normal file
View File

@ -0,0 +1,279 @@
// Minimal Ogg decoder according to rfc3533
// (https://www.xiph.org/ogg/doc/rfc3533.txt). Whenever 'the spec' is mentioned,
// it is referring to rfc3533.
package audio
import (
"encoding/binary"
"errors"
"io"
)
var (
ErrOggInvalidMagicNumber = errors.New("ogg: invalid magic number")
ErrOggInvalidChecksum = errors.New("ogg: invalid checksum")
ErrOggInvalidSegmentBufferSize = errors.New("ogg: WriteSegment(): invalid segment buffer size")
)
const (
headerSize = 27
// Uncombined segments are meant here (see Page.Segments or the spec for
// more details about segments).
maxSegments = 255
maxSegmentSize = 255
maxPageSize = headerSize + maxSegments + maxSegments*maxSegmentSize
)
// Using polynomial 0x04c11db7 (see the spec).
var crcLookup = [256]uint32{
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4,
}
type crc32Writer struct {
sum uint32
}
func (w *crc32Writer) Write(p []byte) (n int, err error) {
for _, v := range p {
w.sum = (w.sum << 8) ^ crcLookup[uint8(w.sum>>24)^v]
}
return len(p), nil
}
var (
FHeaderTypeContinuation = uint8(0x1)
FHeaderTypeBOS = uint8(0x2) // Beginning of stream
FHeaderTypeEOS = uint8(0x4) // End of stream
)
// See the spec for more info on the individual fields.
type oggPageHeader struct {
MagicNumber [4]uint8
Version uint8
HeaderType uint8
GranulePosition uint64
BitstreamSerialNum uint32
PageSequenceNum uint32
Checksum uint32
NumSegments uint8 // Number of uncombined segments (see Page.Segments or the spec for more details).
}
type oggPage struct {
Header oggPageHeader
// These are the combined segments. The spec says that when a segment is
// said to have a length of 255, it is to be combined with the next segment,
// which is already done here.
Segments [][]byte
}
type oggDecoder struct {
r io.Reader
sum *crc32Writer
givenSum uint32
done bool
sd *oggSegmentDecoder
}
// An oggDecoder decodes the given raw Ogg data according to rfc3533
// (https://www.xiph.org/ogg/doc/rfc3533.txt).
// The given reader `r` must be set to start at the beginning of the page, i.e.
// at the magic number "OggS".
// The data is dispensed in units of pages, each of which returns a segment
// decoder for getting the individual segments.
func newOggDecoder(r io.Reader) *oggDecoder {
return &oggDecoder{
r: r,
}
}
func (d *oggDecoder) More() bool {
return !d.done
}
func (d *oggDecoder) Page() (hdr oggPageHeader, sd *oggSegmentDecoder, err error) {
if d.sd != nil {
for d.sd.More() {
err = d.sd.SkipSegment()
if err != nil {
return
}
}
}
sd = &oggSegmentDecoder{}
d.sd = sd
// Read header
err = binary.Read(d.r, binary.LittleEndian, &hdr)
if err != nil {
return
}
// Validate magic number
if string(hdr.MagicNumber[:]) != "OggS" {
err = ErrOggInvalidMagicNumber
return
}
// Save the given checksum to match later
sd.givenSum = hdr.Checksum
// Set checksum field to 0 before recalculating the checksum
hdr.Checksum = 0
sd.sum = &crc32Writer{}
// Write header to checksum
binary.Write(sd.sum, binary.LittleEndian, hdr)
// Write any future data read by the segment reader to the checksum as well
sd.r = io.TeeReader(d.r, sd.sum)
// Read the sizes of all page segments
segsizes := make([]byte, hdr.NumSegments)
sd.r.Read(segsizes)
// Whether to add to the last segment size: Whenever a segment length is
// specified as being 255, that means the next segment should be appended
// to it.
var add bool
for _, s := range segsizes {
if add {
sd.fullSegsizes[len(sd.fullSegsizes)-1] += int(s)
} else {
sd.fullSegsizes = append(sd.fullSegsizes, int(s))
}
add = s == 255
}
if hdr.HeaderType == FHeaderTypeEOS {
d.done = true
}
return
}
type oggSegmentDecoder struct {
dec *oggDecoder
r io.Reader
sum *crc32Writer
givenSum uint32
fullSegsizes []int
i int // segment index
done bool
}
func (d *oggSegmentDecoder) More() bool {
return !d.done
}
func (d *oggSegmentDecoder) SegmentSize() int {
return d.fullSegsizes[d.i]
}
func (d *oggSegmentDecoder) SkipSegment() error {
_, err := io.CopyN(io.Discard, d.r, int64(d.fullSegsizes[d.i]))
if err != nil {
d.done = true
return err
}
d.i++
if d.i == len(d.fullSegsizes) {
d.done = true
if d.sum.sum != d.givenSum {
return ErrOggInvalidChecksum
}
}
return nil
}
// Assumes buf to be exactly the right size (use SegmentSize() to get the size beforehand)
func (d *oggSegmentDecoder) ReadSegment(buf []byte) error {
if len(buf) != d.fullSegsizes[d.i] {
return ErrOggInvalidSegmentBufferSize
}
_, err := io.ReadFull(d.r, buf)
if err != nil {
d.done = true
return err
}
d.i++
if d.i == len(d.fullSegsizes) {
d.done = true
if d.sum.sum != d.givenSum {
return ErrOggInvalidChecksum
}
}
return nil
}

49
build-all.sh Executable file
View File

@ -0,0 +1,49 @@
#! /usr/bin/env sh
SRC=cmd/dischord/*.go
BUILDDIR="build"
BUILD_CMDS=""
BUILDS=0
DONE=0
[ "$1" = "clean" ] && echo "Cleaning $BUILDDIR" && rm -rf "$BUILDDIR" && exit 0
do_build() {
[ "$OS" = "windows" ] && EXT=".exe"
env GOOS="$OS" GOARCH="$ARCH" CGO_ENABLED=0 go build -ldflags "-s -w" -o "$BUILDDIR/$NAME$EXT" $SRC
}
add() {
BUILDS=$((BUILDS+1))
BUILD_CMDS=$(printf "%s\n%s" "$BUILD_CMDS" "$1 $2 $3")
}
build() {
mkdir -p "$BUILDDIR"
BUILD_CMDS="$(printf "%s" "$BUILD_CMDS" | grep '.')"
while IFS= read -r l; do
OS=$(echo $l|cut -d\ -f1)
ARCH=$(echo $l|cut -d\ -f2)
NAME=$(echo $l|cut -d\ -f3)
echo "Building for $OS on $ARCH"
printf "%s\r" "Progress: $((DONE*100/BUILDS))%"
do_build
DONE=$((DONE+1))
done << EOF
$BUILD_CMDS
EOF
echo "Progress: DONE"
}
# see `go tool dist list` for possible configs
add linux 386 dischord-linux-x86
add linux amd64 dischord-linux-amd64
add linux arm dischord-linux-arm32
add linux arm64 dischord-linux-arm64
add darwin arm64 dischord-macos-apple-silicon
add darwin amd64 dischord-macos-intel
add windows 386 dischord-windows-x86
add windows amd64 dischord-windows-amd64
build

BIN
cmd/dischord/bye.opus Normal file
View File

Binary file not shown.

773
cmd/dischord/copyright.go Normal file
View File

@ -0,0 +1,773 @@
package main
const copyrightText = `=== Dischord ===
Copyright (C) Darwin Schuppan
License: GNU General Public License Version 3 (see below)
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights. Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received. You must make sure that they, too, receive
or can get the source code. And you must show them these terms so they
know their rights.
Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software. For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.
Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so. This is fundamentally incompatible with the aim of
protecting users' freedom to change the software. The systematic
pattern of such abuse occurs in the area of products for individuals to
use, which is precisely where it is most unacceptable. Therefore, we
have designed this version of the GPL to prohibit the practice for those
products. If such problems arise substantially in other domains, we
stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and
modification follow.
TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
"The Program" refers to any copyrightable work licensed under this
License. Each licensee is addressed as "you". "Licensees" and
"recipients" may be individuals or organizations.
To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.
A "covered work" means either the unmodified Program or a work based
on the Program.
To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy. Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.
To "convey" a work means any kind of propagation that enables other
parties to make or receive copies. Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.
An interactive user interface displays "Appropriate Legal Notices"
to the extent that it includes a convenient and prominently visible
feature that (1) displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License. If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.
1. Source Code.
The "source code" for a work means the preferred form of the work
for making modifications to it. "Object code" means any non-source
form of a work.
A "Standard Interface" means an interface that either is an official
standard defined by a recognized standards body, or, in the case of
interfaces specified for a particular programming language, one that
is widely used among developers working in that language.
The "System Libraries" of an executable work include anything, other
than the work as a whole, that (a) is included in the normal form of
packaging a Major Component, but which is not part of that Major
Component, and (b) serves only to enable use of the work with that
Major Component, or to implement a Standard Interface for which an
implementation is available to the public in source code form. A
"Major Component", in this context, means a major essential component
(kernel, window system, and so on) of the specific operating system
(if any) on which the executable work runs, or a compiler used to
produce the work, or an object code interpreter used to run it.
The "Corresponding Source" for a work in object code form means all
the source code needed to generate, install, and (for an executable
work) run the object code and to modify the work, including scripts to
control those activities. However, it does not include the work's
System Libraries, or general-purpose tools or generally available free
programs which are used unmodified in performing those activities but
which are not part of the work. For example, Corresponding Source
includes interface definition files associated with source files for
the work, and the source code for shared libraries and dynamically
linked subprograms that the work is specifically designed to require,
such as by intimate data communication or control flow between those
subprograms and other parts of the work.
The Corresponding Source need not include anything that users
can regenerate automatically from other parts of the Corresponding
Source.
The Corresponding Source for a work in source code form is that
same work.
2. Basic Permissions.
All rights granted under this License are granted for the term of
copyright on the Program, and are irrevocable provided the stated
conditions are met. This License explicitly affirms your unlimited
permission to run the unmodified Program. The output from running a
covered work is covered by this License only if the output, given its
content, constitutes a covered work. This License acknowledges your
rights of fair use or other equivalent, as provided by copyright law.
You may make, run and propagate covered works that you do not
convey, without conditions so long as your license otherwise remains
in force. You may convey covered works to others for the sole purpose
of having them make modifications exclusively for you, or provide you
with facilities for running those works, provided that you comply with
the terms of this License in conveying all material for which you do
not control copyright. Those thus making or running the covered works
for you must do so exclusively on your behalf, under your direction
and control, on terms that prohibit them from making any copies of
your copyrighted material outside their relationship with you.
Conveying under any other circumstances is permitted solely under
the conditions stated below. Sublicensing is not allowed; section 10
makes it unnecessary.
3. Protecting Users' Legal Rights From Anti-Circumvention Law.
No covered work shall be deemed part of an effective technological
measure under any applicable law fulfilling obligations under article
11 of the WIPO copyright treaty adopted on 20 December 1996, or
similar laws prohibiting or restricting circumvention of such
measures.
When you convey a covered work, you waive any legal power to forbid
circumvention of technological measures to the extent such circumvention
is effected by exercising rights under this License with respect to
the covered work, and you disclaim any intention to limit operation or
modification of the work as a means of enforcing, against the work's
users, your or third parties' legal rights to forbid circumvention of
technological measures.
4. Conveying Verbatim Copies.
You may convey verbatim copies of the Program's source code as you
receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice;
keep intact all notices stating that this License and any
non-permissive terms added in accord with section 7 apply to the code;
keep intact all notices of the absence of any warranty; and give all
recipients a copy of this License along with the Program.
You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.
5. Conveying Modified Source Versions.
You may convey a work based on the Program, or the modifications to
produce it from the Program, in the form of source code under the
terms of section 4, provided that you also meet all of these conditions:
a) The work must carry prominent notices stating that you modified
it, and giving a relevant date.
b) The work must carry prominent notices stating that it is
released under this License and any conditions added under section
7. This requirement modifies the requirement in section 4 to
"keep intact all notices".
c) You must license the entire work, as a whole, under this
License to anyone who comes into possession of a copy. This
License will therefore apply, along with any applicable section 7
additional terms, to the whole of the work, and all its parts,
regardless of how they are packaged. This License gives no
permission to license the work in any other way, but it does not
invalidate such permission if you have separately received it.
d) If the work has interactive user interfaces, each must display
Appropriate Legal Notices; however, if the Program has interactive
interfaces that do not display Appropriate Legal Notices, your
work need not make them do so.
A compilation of a covered work with other separate and independent
works, which are not by their nature extensions of the covered work,
and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
"aggregate" if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.
6. Conveying Non-Source Forms.
You may convey a covered work in object code form under the terms
of sections 4 and 5, provided that you also convey the
machine-readable Corresponding Source under the terms of this License,
in one of these ways:
a) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by the
Corresponding Source fixed on a durable physical medium
customarily used for software interchange.
b) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by a
written offer, valid for at least three years and valid for as
long as you offer spare parts or customer support for that product
model, to give anyone who possesses the object code either (1) a
copy of the Corresponding Source for all the software in the
product that is covered by this License, on a durable physical
medium customarily used for software interchange, for a price no
more than your reasonable cost of physically performing this
conveying of source, or (2) access to copy the
Corresponding Source from a network server at no charge.
c) Convey individual copies of the object code with a copy of the
written offer to provide the Corresponding Source. This
alternative is allowed only occasionally and noncommercially, and
only if you received the object code with such an offer, in accord
with subsection 6b.
d) Convey the object code by offering access from a designated
place (gratis or for a charge), and offer equivalent access to the
Corresponding Source in the same way through the same place at no
further charge. You need not require recipients to copy the
Corresponding Source along with the object code. If the place to
copy the object code is a network server, the Corresponding Source
may be on a different server (operated by you or a third party)
that supports equivalent copying facilities, provided you maintain
clear directions next to the object code saying where to find the
Corresponding Source. Regardless of what server hosts the
Corresponding Source, you remain obligated to ensure that it is
available for as long as needed to satisfy these requirements.
e) Convey the object code using peer-to-peer transmission, provided
you inform other peers where the object code and Corresponding
Source of the work are being offered to the general public at no
charge under subsection 6d.
A separable portion of the object code, whose source code is excluded
from the Corresponding Source as a System Library, need not be
included in conveying the object code work.
A "User Product" is either (1) a "consumer product", which means any
tangible personal property which is normally used for personal, family,
or household purposes, or (2) anything designed or sold for incorporation
into a dwelling. In determining whether a product is a consumer product,
doubtful cases shall be resolved in favor of coverage. For a particular
product received by a particular user, "normally used" refers to a
typical or common use of that class of product, regardless of the status
of the particular user or of the way in which the particular user
actually uses, or expects or is expected to use, the product. A product
is a consumer product regardless of whether the product has substantial
commercial, industrial or non-consumer uses, unless such uses represent
the only significant mode of use of the product.
"Installation Information" for a User Product means any methods,
procedures, authorization keys, or other information required to install
and execute modified versions of a covered work in that User Product from
a modified version of its Corresponding Source. The information must
suffice to ensure that the continued functioning of the modified object
code is in no case prevented or interfered with solely because
modification has been made.
If you convey an object code work under this section in, or with, or
specifically for use in, a User Product, and the conveying occurs as
part of a transaction in which the right of possession and use of the
User Product is transferred to the recipient in perpetuity or for a
fixed term (regardless of how the transaction is characterized), the
Corresponding Source conveyed under this section must be accompanied
by the Installation Information. But this requirement does not apply
if neither you nor any third party retains the ability to install
modified object code on the User Product (for example, the work has
been installed in ROM).
The requirement to provide Installation Information does not include a
requirement to continue to provide support service, warranty, or updates
for a work that has been modified or installed by the recipient, or for
the User Product in which it has been modified or installed. Access to a
network may be denied when the modification itself materially and
adversely affects the operation of the network or violates the rules and
protocols for communication across the network.
Corresponding Source conveyed, and Installation Information provided,
in accord with this section must be in a format that is publicly
documented (and with an implementation available to the public in
source code form), and must require no special password or key for
unpacking, reading or copying.
7. Additional Terms.
"Additional permissions" are terms that supplement the terms of this
License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
be treated as though they were included in this License, to the extent
that they are valid under applicable law. If additional permissions
apply only to part of the Program, that part may be used separately
under those permissions, but the entire Program remains governed by
this License without regard to the additional permissions.
When you convey a copy of a covered work, you may at your option
remove any additional permissions from that copy, or from any part of
it. (Additional permissions may be written to require their own
removal in certain cases when you modify the work.) You may place
additional permissions on material, added by you to a covered work,
for which you have or can give appropriate copyright permission.
Notwithstanding any other provision of this License, for material you
add to a covered work, you may (if authorized by the copyright holders of
that material) supplement the terms of this License with terms:
a) Disclaiming warranty or limiting liability differently from the
terms of sections 15 and 16 of this License; or
b) Requiring preservation of specified reasonable legal notices or
author attributions in that material or in the Appropriate Legal
Notices displayed by works containing it; or
c) Prohibiting misrepresentation of the origin of that material, or
requiring that modified versions of such material be marked in
reasonable ways as different from the original version; or
d) Limiting the use for publicity purposes of names of licensors or
authors of the material; or
e) Declining to grant rights under trademark law for use of some
trade names, trademarks, or service marks; or
f) Requiring indemnification of licensors and authors of that
material by anyone who conveys the material (or modified versions of
it) with contractual assumptions of liability to the recipient, for
any liability that these contractual assumptions directly impose on
those licensors and authors.
All other non-permissive additional terms are considered "further
restrictions" within the meaning of section 10. If the Program as you
received it, or any part of it, contains a notice stating that it is
governed by this License along with a term that is a further
restriction, you may remove that term. If a license document contains
a further restriction but permits relicensing or conveying under this
License, you may add to a covered work material governed by the terms
of that license document, provided that the further restriction does
not survive such relicensing or conveying.
If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in the
form of a separately written license, or stated as exceptions;
the above requirements apply either way.
8. Termination.
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and (b) permanently, if the copyright
holder fails to notify you of the violation by some reasonable means
prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License. If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.
9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
modify any covered work. These actions infringe copyright if you do
not accept this License. Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.
10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You are not responsible
for enforcing compliance by third parties with this License.
An "entity transaction" is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a covered
work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party's predecessor in interest had or could
give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if
the predecessor has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.
11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License. You may not convey a covered
work if you are a party to an arrangement with a third party that is
in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
the work, and under which the third party grants, to any of the
parties who would receive the covered work from you, a discriminatory
patent license (a) in connection with copies of the covered work
conveyed by you (or copies made from those copies), or (b) primarily
for and in connection with specific products or compilations that
contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type 'show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'show c' for details.
The hypothetical commands 'show w' and 'show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
=== https://github.com/BurntSushi/toml ===
The MIT License (MIT)
Copyright (c) 2013 TOML authors
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
=== https://github.com/ulikunitz/xz ===
Copyright (c) 2014-2021 Ulrich Kunitz
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* My name, Ulrich Kunitz, may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
=== https://github.com/bwmarrin/discordgo ===
Copyright (c) 2015, Bruce Marriner
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of discordgo nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.`

1204
cmd/dischord/dischord.go Normal file
View File

File diff suppressed because it is too large Load Diff

234
config/config.go Normal file
View File

@ -0,0 +1,234 @@
package config
import (
"github.com/BurntSushi/toml"
"git.nobrain.org/r4/dischord/extractor"
"errors"
"fmt"
"os"
"os/exec"
"runtime"
)
var (
ErrTokenNotSet = errors.New("bot token not set")
ErrInvalidYoutubeDlPath = errors.New("invalid youtube-dl path")
ErrInvalidFfmpegPath = errors.New("invalid FFmpeg path")
ErrYoutubeDlNotFound = errors.New("youtube-dl not found, please install it from https://youtube-dl.org/ first")
ErrFfmpegNotFound = errors.New("FFmpeg not found, please install it from https://ffmpeg.org first")
ErrPythonNotInstalled = errors.New("python not installed")
)
type Config struct {
Token string `toml:"bot-token"`
FfmpegPath string `toml:"ffmpeg-path"`
Extractors extractor.Config `toml:"extractors"`
}
const (
defaultToken = "insert your Discord bot token here"
)
var (
ffmpegPaths = []string{"ffmpeg", "./ffmpeg"}
youtubeDlPaths = []string{"youtube-dl", "./youtube-dl", "yt-dlp", "./yt-dlp", "youtube-dlc", "./youtube-dlc"}
)
// Returns a valid path if one exists. Returns "" if none found.
func searchExecPaths(paths ...string) string {
for _, pathbase := range paths {
path := pathbase
if runtime.GOOS == "windows" {
path += ".exe"
}
if _, err := exec.LookPath(path); err == nil {
return path
}
}
return ""
}
func write(filename string, cfg *Config) error {
file, err := os.Create(filename)
if err != nil {
return err
}
defer file.Close()
if _, err := file.WriteString(`# Insert your Discord bot token here.
# It can be found at https://discord.com/developers/applications -> <your application> -> Bot -> Reset Token.
# Make sure to keep the "" around your token text.
`); err != nil {
return err
}
enc := toml.NewEncoder(file)
enc.Indent = ""
if err := enc.Encode(cfg); err != nil {
return err
}
return nil
}
func macosEnableExecutable(filename string) error {
if runtime.GOOS != "darwin" {
return nil
}
// Commands from http://www.osxexperts.net/
if runtime.GOARCH == "arm64" {
cmd := exec.Command("xattr", "-cr", filename)
if err := cmd.Run(); err != nil {
return err
}
cmd = exec.Command("codesign", "-s", "-", filename)
if err := cmd.Run(); err != nil {
return err
}
} else if runtime.GOARCH == "amd64" {
cmd := exec.Command("xattr", "-dr", "com.apple.quarantine", filename)
if err := cmd.Run(); err != nil {
return err
}
}
return nil
}
// Tries to load the given TOML config file. Returns an error if the
// configuration file does not exist or is invalid.
func Load(filename string) (*Config, error) {
cfg := &Config{}
_, err := toml.DecodeFile(filename, cfg)
if err != nil {
return nil, err
}
if cfg.Token == defaultToken || cfg.Token == "" {
return nil, ErrTokenNotSet
}
if err := cfg.Extractors.CheckTypes(); err != nil {
return nil, err
}
if _, err := exec.LookPath(cfg.Extractors["youtube-dl"]["youtube-dl-path"].(string)); err != nil {
return nil, ErrInvalidYoutubeDlPath
}
if _, err := exec.LookPath(cfg.FfmpegPath); err != nil {
return nil, ErrInvalidFfmpegPath
}
return cfg, nil
}
// Automatically creates a TOML configuration file with the default values and
// prints information and instructions for the user to stdout.
func Autoconf(filename string) (*Config, error) {
cfg := &Config{
Token: defaultToken,
Extractors: extractor.DefaultConfig(),
}
download := func(executable bool, urlsByOS map[string]map[string]string) (filename string, err error) {
filename, err = download(executable, urlsByOS, func(progress float32){
fmt.Printf("Progress: %.1f%%\r", progress*100.0)
})
if err != nil {
fmt.Println()
return "", err
} else {
fmt.Println("Progress: Finished downloading")
}
return filename, nil
}
python3IsPython := false
if runtime.GOOS != "windows" {
if _, err := exec.LookPath("python"); err != nil {
if _, err := exec.LookPath("python3"); err == nil {
python3IsPython = true
} else {
return nil, ErrPythonNotInstalled
}
}
}
youtubeDlPath := searchExecPaths(youtubeDlPaths...)
if youtubeDlPath == "" {
fmt.Println("Downloading youtube-dl")
filename, err := download(true, map[string]map[string]string{
"windows": {
"amd64": "https://yt-dl.org/downloads/latest/youtube-dl.exe",
"386": "https://yt-dl.org/downloads/latest/youtube-dl.exe",
},
"any": {
"any": "https://yt-dl.org/downloads/latest/youtube-dl",
},
})
if err != nil {
return nil, err
}
youtubeDlPath = "./"+filename
macosEnableExecutable(youtubeDlPath)
if python3IsPython {
// Replace first line with `replacement`
data, err := os.ReadFile(youtubeDlPath)
if err != nil {
return nil, err
}
replacement := []byte("#!/usr/bin/env python3")
for i, c := range data {
if c == '\n' {
data = append(replacement, data[i:]...)
break
}
}
if err := os.WriteFile(youtubeDlPath, data, 0777); err != nil {
return nil, err
}
}
} else {
fmt.Println("Using youtube-dl executable found at", youtubeDlPath)
}
cfg.Extractors["youtube-dl"]["youtube-dl-path"] = youtubeDlPath
cfg.FfmpegPath = searchExecPaths(ffmpegPaths...)
if cfg.FfmpegPath == "" {
targetFile := "ffmpeg"
if runtime.GOOS == "windows" {
targetFile += ".exe"
}
fmt.Println("Downloading FFmpeg")
filename, err := download(false, map[string]map[string]string{
"linux": {
"amd64": "https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz",
"386": "https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-i686-static.tar.xz",
"arm64": "https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-arm64-static.tar.xz",
"arm": "https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-armhf-static.tar.xz",
},
"windows": {
"amd64": "https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip",
"386": "https://github.com/sudo-nautilus/FFmpeg-Builds-Win32/releases/download/latest/ffmpeg-n5.1-latest-win32-gpl-5.1.zip",
},
"darwin": {
"amd64": "https://evermeet.cx/ffmpeg/getrelease/zip",
"arm64": "https://www.osxexperts.net/FFmpeg511ARM.zip",
},
})
if err != nil {
return nil, err
}
fmt.Println("Unpacking", targetFile, "from", filename)
if err := unarchiveSingleFile(filename, targetFile); err != nil {
return nil, err
}
if err := os.Remove(filename); err != nil {
return nil, err
}
cfg.FfmpegPath = "./"+targetFile
macosEnableExecutable(cfg.FfmpegPath)
} else {
fmt.Println("Using FFmpeg executable found at", cfg.FfmpegPath)
}
fmt.Println("Writing configuration to", filename)
write(filename, cfg)
fmt.Println("Almost done. Now just edit", filename, "and set your bot token.")
return cfg, nil
}

191
config/util.go Normal file
View File

@ -0,0 +1,191 @@
package config
import (
"github.com/ulikunitz/xz"
"archive/tar"
"archive/zip"
"compress/gzip"
"errors"
"io"
"io/fs"
"mime"
"net/http"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
)
var (
ErrUnsupportedOSAndArch = errors.New("no download available for your operating system and hardware architecture")
ErrFileNotFoundInArchive = errors.New("file not found in archive")
ErrUnsupportedArchive = errors.New("unsupported archive format (supported are .tar, .tar.gz, .tar.xz and .zip")
)
func download(executable bool, urlsByOS map[string]map[string]string, progCallback func(progress float32)) (filename string, err error) {
// Find appropriate URL
var url string
var urlByArch map[string]string
var ok bool
if urlByArch, ok = urlsByOS[runtime.GOOS]; !ok {
urlByArch, ok = urlsByOS["any"]
}
if ok {
if url, ok = urlByArch[runtime.GOARCH]; !ok {
url, ok = urlByArch["any"]
}
}
if !ok {
return "", ErrUnsupportedOSAndArch
}
// Initiate request
lastPath := url
resp, err := http.Get(url)
if err != nil {
return "", err
}
defer resp.Body.Close()
// Get the filename to save the downloaded file to
var savePath string
if v := resp.Header.Get("Content-Disposition"); v != "" {
disposition, params, err := mime.ParseMediaType(v)
if err != nil {
return "", err
}
if disposition == "attachment" {
lastPath = params["filename"]
}
}
if savePath == "" {
sp := strings.Split(lastPath, "/")
savePath = sp[len(sp)-1]
}
// Download resource
size, _ := strconv.Atoi(resp.Header.Get("content-length"))
var perms uint32 = 0666
if executable {
perms = 0777
}
file, err := os.OpenFile(savePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fs.FileMode(perms))
if err != nil {
return "", err
}
for i := 0; ; i += 100_000 {
_, err := io.CopyN(file, resp.Body, 100_000)
if err != nil {
if err == io.EOF {
break
} else {
return "", err
}
}
if progCallback != nil && size != 0 {
progCallback(float32(i)/float32(size))
}
}
return savePath, nil
}
func unarchiveSingleFile(archive, target string) error {
unzip := func() error {
ar, err := zip.OpenReader(archive)
if err != nil {
return err
}
defer ar.Close()
found := false
for _, file := range ar.File {
if !file.FileInfo().IsDir() && filepath.Base(file.Name) == target {
found = true
dstFile, err := os.OpenFile(target, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, file.Mode())
if err != nil {
return err
}
defer dstFile.Close()
fileReader, err := file.Open()
if err != nil {
return err
}
defer fileReader.Close()
if _, err := io.Copy(dstFile, fileReader); err != nil {
return err
}
}
}
if !found {
return ErrFileNotFoundInArchive
}
return nil
}
untar := func(rd io.Reader) error {
ar := tar.NewReader(rd)
for {
hdr, err := ar.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
if hdr.Typeflag == tar.TypeReg && filepath.Base(hdr.Name) == target {
dstFile, err := os.OpenFile(target, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fs.FileMode(hdr.Mode))
if err != nil {
return err
}
defer dstFile.Close()
if _, err := io.Copy(dstFile, ar); err != nil {
return err
}
return nil
}
}
return ErrFileNotFoundInArchive
}
match := func(name string, patterns ...string) bool {
for _, pattern := range patterns {
matches, err := filepath.Match(pattern, archive)
if err != nil {
panic(err)
}
if matches {
return true
}
}
return false
}
if match(archive, "*.zip") {
return unzip()
} else if match(archive, "*.tar", "*.tar.[gx]z") {
file, err := os.Open(archive)
if err != nil {
return err
}
defer file.Close()
var uncompressedFile io.Reader
if match(archive, "*.tar") {
uncompressedFile = file
} else if match(archive, "*.tar.gz") {
gz, err := gzip.NewReader(file)
if err != nil {
return err
}
defer gz.Close()
uncompressedFile = gz
} else if match(archive, "*.tar.xz") {
uncompressedFile, err = xz.NewReader(file)
if err != nil {
return err
}
}
return untar(uncompressedFile)
} else {
return ErrUnsupportedArchive
}
return nil
}

7
extractor/builtins/builtins.go Normal file
View File

@ -0,0 +1,7 @@
package builtins
import (
_ "git.nobrain.org/r4/dischord/extractor/spotify"
_ "git.nobrain.org/r4/dischord/extractor/youtube"
_ "git.nobrain.org/r4/dischord/extractor/ytdl"
)

208
extractor/extractor.go Normal file
View File

@ -0,0 +1,208 @@
package extractor
import (
"errors"
"fmt"
"reflect"
"time"
)
var (
ErrNoSearchResults = errors.New("no search provider available")
ErrNoSearchProvider = errors.New("no search provider available")
ErrNoSuggestionProvider = errors.New("no search suggestion provider available")
)
var (
providers []provider
extractors []extractor
searchers []searcher
suggestors []suggestor
defaultConfig Config
)
func Extract(cfg Config, input string) ([]Data, error) {
if err := cfg.CheckTypes(); err != nil {
return nil, err
}
for _, e := range extractors {
if e.Matches(cfg[e.name], input) {
data, err := e.Extract(cfg[e.name], input)
if err != nil {
return nil, &Error{e.name, err}
}
return data, nil
}
}
d, err := Search(cfg, input)
if err != nil {
return nil, err
}
if len(d) == 0 {
return nil, ErrNoSearchResults
}
return []Data{d[0]}, nil
}
func Search(cfg Config, input string) ([]Data, error) {
if err := cfg.CheckTypes(); err != nil {
return nil, err
}
for _, s := range searchers {
data, err := s.Search(cfg[s.name], input)
if err != nil {
return nil, &Error{s.name, err}
}
return data, nil
}
return nil, ErrNoSearchProvider
}
func Suggest(cfg Config, input string) ([]string, error) {
if err := cfg.CheckTypes(); err != nil {
return nil, err
}
for _, s := range suggestors {
data, err := s.Suggest(cfg[s.name], input)
if err != nil {
return nil, &Error{s.name, err}
}
return data, nil
}
return nil, ErrNoSuggestionProvider
}
type Error struct {
ProviderName string
Err error
}
func (e *Error) Error() string {
return "extractor[" + e.ProviderName + "]: " + e.Err.Error()
}
type provider struct {
Provider
name string
}
type extractor struct {
Extractor
name string
}
type searcher struct {
Searcher
name string
}
type suggestor struct {
Suggestor
name string
}
type Config map[string]ProviderConfig
func DefaultConfig() Config {
if defaultConfig == nil {
cfg := make(Config)
for _, e := range providers {
cfg[e.name] = e.DefaultConfig()
}
return cfg
} else {
return defaultConfig
}
}
func (cfg Config) CheckTypes() error {
for provider, pCfg := range cfg {
if pCfg == nil {
return fmt.Errorf("extractor config for %v is nil", provider)
}
for k, v := range pCfg {
got, expected := reflect.TypeOf(v), reflect.TypeOf(DefaultConfig()[provider][k])
if got != expected {
return &ConfigTypeError{
Provider: provider,
Key: k,
Expected: expected,
Got: got,
}
}
}
}
return nil
}
type ConfigTypeError struct {
Provider string
Key string
Expected reflect.Type
Got reflect.Type
}
func (e *ConfigTypeError) Error() string {
expectedName := "nil"
if e.Expected != nil {
expectedName = e.Expected.Name()
}
gotName := "nil"
if e.Got != nil {
gotName = e.Got.Name()
}
return "extractor config type error: "+e.Provider+"."+e.Key+": expected "+expectedName+" but got "+gotName
}
type ProviderConfig map[string]any
type Provider interface {
DefaultConfig() ProviderConfig
}
type Extractor interface {
Provider
Matches(cfg ProviderConfig, input string) bool
Extract(cfg ProviderConfig, input string) ([]Data, error)
}
func AddExtractor(name string, e Extractor) {
providers = append(providers, provider{e, name})
extractors = append(extractors, extractor{e, name})
}
type Searcher interface {
Provider
Search(cfg ProviderConfig, input string) ([]Data, error)
}
func AddSearcher(name string, s Searcher) {
providers = append(providers, provider{s, name})
searchers = append(searchers, searcher{s, name})
}
type Suggestor interface {
Provider
Suggest(cfg ProviderConfig, input string) ([]string, error)
}
func AddSuggestor(name string, s Suggestor) {
providers = append(providers, provider{s, name})
suggestors = append(suggestors, suggestor{s, name})
}
type Data struct {
// Each instance of this struct should be reconstructable by calling
// Extract() on the SourceUrl
// String values are "" if not present
SourceUrl string
StreamUrl string // may expire, see Expires
Title string
PlaylistUrl string
PlaylistTitle string
Description string
Uploader string
Duration int // in seconds; -1 if unknown
Expires time.Time // when StreamUrl expires
OfficialArtist bool // only for sites that have non-music (e.g. YouTube); search results only
}

220
extractor/extractor_test.go Normal file
View File

@ -0,0 +1,220 @@
package extractor_test
import (
"git.nobrain.org/r4/dischord/extractor"
_ "git.nobrain.org/r4/dischord/extractor/builtins"
"net/http"
"net/url"
"strings"
"testing"
)
var extractorTestCfg = extractor.DefaultConfig()
func validYtStreamUrl(strmUrl string) bool {
u, err := url.Parse(strmUrl)
if err != nil {
return false
}
q, err := url.ParseQuery(u.RawQuery)
if err != nil {
return false
}
looksOk := u.Scheme == "https" &&
strings.HasSuffix(u.Host, ".googlevideo.com") &&
u.Path == "/videoplayback" &&
q.Has("expire") &&
q.Has("id")
if !looksOk {
return false
}
resp, err := http.Get(strmUrl)
if err != nil {
return false
}
defer resp.Body.Close()
return resp.StatusCode == 200
}
func verifySearchResult(t *testing.T, data []extractor.Data, targetUrl string) {
if len(data) == 0 {
t.Fatalf("Expected search results but got none")
}
first := data[0]
if first.SourceUrl != targetUrl {
t.Fatalf("Invalid search result: expected '%v' but got '%v'", targetUrl, first.SourceUrl)
}
strmData, err := extractor.Extract(extractorTestCfg, first.SourceUrl)
if err != nil {
t.Fatalf("Error retrieving video data: %v", err)
}
if len(strmData) != 1 {
t.Fatalf("Expected exactly one extraction result")
}
if !validYtStreamUrl(strmData[0].StreamUrl) {
t.Fatalf("Invalid YouTube stream URL: got '%v'", strmData[0].StreamUrl)
}
}
func TestSearch(t *testing.T) {
extractor.Extract(extractorTestCfg, "https://open.spotify.com/track/22z9GL53FudbuFJqa43Nzj")
data, err := extractor.Search(extractorTestCfg, "nilered turns water into wine like jesus")
if err != nil {
t.Fatalf("Error searching YouTube: %v", err)
}
verifySearchResult(t, data, "https://www.youtube.com/watch?v=tAU0FX1d044")
}
func TestSearchPlaylist(t *testing.T) {
data, err := extractor.Search(extractorTestCfg, "instant regret clicking this playlist epic donut dude")
if err != nil {
t.Fatalf("Error searching YouTube: %v", err)
}
if len(data) == 0 {
t.Fatalf("Expected search results but got none")
}
target := "https://www.youtube.com/playlist?list=PLv3TTBr1W_9tppikBxAE_G6qjWdBljBHJ"
if data[0].PlaylistUrl != target {
t.Fatalf("Invalid search result: expected '%v' but got '%v'", target, data[0].SourceUrl)
}
}
func TestSearchSuggestions(t *testing.T) {
sug, err := extractor.Suggest(extractorTestCfg, "a")
if err != nil {
t.Fatalf("Error: %v", err)
}
if len(sug) == 0 {
t.Fatalf("Function didn't return any suggestions")
}
}
func TestSearchIntegrityWeirdCharacters(t *testing.T) {
data, err := extractor.Extract(extractorTestCfg, "test lol | # !@#%&(*)!&*!äöfáßö®©œæ %% %3 %32")
if err != nil {
t.Fatalf("Error searching YouTube: %v", err)
}
if len(data) != 1 {
t.Fatalf("Expected exactly one URL but got %v", len(data))
}
}
func TestYoutubeMusicVideo(t *testing.T) {
data, err := extractor.Extract(extractorTestCfg, "https://www.youtube.com/watch?v=dQw4w9WgXcQ")
if err != nil {
t.Fatalf("Error searching YouTube: %v", err)
}
if len(data) != 1 {
t.Fatalf("Expected exactly one URL but got %v", len(data))
}
if !validYtStreamUrl(data[0].StreamUrl) {
t.Fatalf("Invalid YouTube stream URL: got '%v'", data[0].StreamUrl)
}
}
func TestYoutubeMusicVideoMulti(t *testing.T) {
for i := 0; i < 10; i++ {
TestYoutubeMusicVideo(t)
}
}
func TestYoutubePlaylist(t *testing.T) {
cfg := extractor.DefaultConfig()
cfg["YouTube"]["Require direct playlist URL"] = "true"
url := "https://www.youtube.com/watch?v=jdUXfsMTv7o&list=PLdImBTpIvHA1xN1Dfw2Ec5NQ5d-LF3ZP5"
pUrl := "https://www.youtube.com/playlist?list=PLdImBTpIvHA1xN1Dfw2Ec5NQ5d-LF3ZP5"
data, err := extractor.Extract(cfg, url)
if err != nil {
t.Fatalf("Error: %v", err)
}
if len(data) != 1 {
t.Fatalf("Expected only a single video")
}
if data[0].PlaylistTitle != "" {
t.Fatalf("Did not expect a playlist")
}
data, err = extractor.Extract(cfg, pUrl)
if err != nil {
t.Fatalf("Error: %v", err)
}
if len(data) != 14 {
t.Fatalf("Invalid playlist item count: got '%v'", len(data))
}
data, err = extractor.Extract(extractorTestCfg, url)
if err != nil {
t.Fatalf("Error: %v", err)
}
if len(data) != 14 {
t.Fatalf("Invalid playlist item count: got '%v'", len(data))
}
if data[0].Title != "Why I use Linux" {
t.Fatalf("Invalid title of first item: got '%v'", data[0].Title)
}
if data[0].Duration != 70 {
t.Fatalf("Invalid duration of first item: got '%v'", data[0].Duration)
}
}
func TestSpotifyTrack(t *testing.T) {
data, err := extractor.Extract(extractorTestCfg, "https://open.spotify.com/track/7HjaeqTHY6QlwPY0MEjuMF")
if err != nil {
t.Fatalf("Error: %v", err)
}
if len(data) != 1 {
t.Fatalf("Expected exactly one URL but got %v", len(data))
}
if data[0].Title != "Infected Mushroom, Ninet Tayeb - Black Velvet" {
t.Fatalf("Invalid song title: %v", data[0].Title)
}
if data[0].Uploader != "Infected Mushroom, Ninet Tayeb" {
t.Fatalf("Invalid artists: %v", data[0].Uploader)
}
if !validYtStreamUrl(data[0].StreamUrl) {
t.Fatalf("Invalid YouTube stream URL: got '%v'", data[0].StreamUrl)
}
}
func TestSpotifyAlbum(t *testing.T) {
data, err := extractor.Extract(extractorTestCfg, "https://open.spotify.com/album/6YEjK95sgoXQn1yGbYjHsp")
if err != nil {
t.Fatalf("Error: %v", err)
}
if len(data) != 11 {
t.Fatalf("Expected exactly 11 tracks but got %v", len(data))
}
if data[0].Title != "Infected Mushroom, Ninet Tayeb - Black Velvet" {
t.Fatalf("Invalid title of first item: got '%v'", data[0].Title)
}
if data[0].Uploader != "Infected Mushroom, Ninet Tayeb" {
t.Fatalf("Invalid artists in first item: %v", data[0].Uploader)
}
if data[1].Title != "Infected Mushroom - While I'm in the Mood" {
t.Fatalf("Invalid title of second item: got '%v'", data[1].Title)
}
}
func TestYoutubeDl(t *testing.T) {
data, err := extractor.Extract(extractorTestCfg, "https://soundcloud.com/pendulum/sets/hold-your-colour-1")
if err != nil {
t.Fatalf("Error: %v", err)
}
if len(data) != 14 {
t.Fatalf("Invalid playlist item count: got '%v'", len(data))
}
if data[0].Title != "Prelude" {
t.Fatalf("Invalid title of first item: got '%v'", data[0].Title)
}
if data[1].Title != "Slam" {
t.Fatalf("Invalid title of second item: got '%v'", data[1].Title)
}
if data[0].PlaylistTitle != "Hold Your Colour" {
t.Fatalf("Invalid playlist title: got '%v'", data[0].PlaylistTitle)
}
}

96
extractor/spotify/providers.go Normal file
View File

@ -0,0 +1,96 @@
package spotify
import (
"git.nobrain.org/r4/dischord/extractor"
"git.nobrain.org/r4/dischord/extractor/youtube"
"errors"
"net/url"
"strings"
)
func init() {
extractor.AddExtractor("spotify", NewExtractor())
}
type matchType int
const (
matchTypeNone matchType = iota
matchTypeTrack
matchTypeAlbum
matchTypePlaylist
)
var (
ErrInvalidInput = errors.New("invalid input")
)
func matches(input string) (string, matchType) {
u, err := url.Parse(input)
if err != nil {
return "", matchTypeNone
}
if u.Scheme != "http" && u.Scheme != "https" {
return "", matchTypeNone
}
if u.Host != "open.spotify.com" {
return "", matchTypeNone
}
sp := strings.Split(u.Path, "/")
if len(sp) != 3 || sp[0] != "" {
return "", matchTypeNone
}
switch sp[1] {
case "track":
return sp[2], matchTypeTrack
case "album":
return sp[2], matchTypeAlbum
case "playlist":
return sp[2], matchTypePlaylist
}
return "", matchTypeNone
}
type Extractor struct {
ytSearcher *youtube.Searcher
ytSearcherConfig extractor.ProviderConfig
ytExtractor *youtube.Extractor
ytExtractorConfig extractor.ProviderConfig
token apiToken
}
func NewExtractor() *Extractor {
extractor := &Extractor{}
extractor.ytSearcher = &youtube.Searcher{}
extractor.ytSearcherConfig = extractor.ytSearcher.DefaultConfig()
extractor.ytExtractor = &youtube.Extractor{}
extractor.ytExtractorConfig = extractor.ytExtractor.DefaultConfig()
return extractor
}
func (e *Extractor) DefaultConfig() extractor.ProviderConfig {
return extractor.ProviderConfig{}
}
func (e *Extractor) Matches(cfg extractor.ProviderConfig, input string) bool {
_, m := matches(input)
return m != matchTypeNone
}
func (e *Extractor) Extract(cfg extractor.ProviderConfig, input string) ([]extractor.Data, error) {
id, m := matches(input)
switch m {
case matchTypeTrack:
d, err := getTrack(e, id)
if err != nil {
return nil, err
}
return []extractor.Data{d}, nil
case matchTypeAlbum:
return getAlbum(e, id)
case matchTypePlaylist:
return getPlaylist(e, id)
}
return nil, ErrInvalidInput
}

378
extractor/spotify/spotify.go Normal file
View File

@ -0,0 +1,378 @@
package spotify
import (
"git.nobrain.org/r4/dischord/extractor"
exutil "git.nobrain.org/r4/dischord/extractor/util"
"encoding/json"
"errors"
"net/http"
"strings"
"time"
)
var (
ErrGettingSessionData = errors.New("unable to get session data")
ErrInvalidTrackData = errors.New("invalid track data")
ErrTrackNotFound = errors.New("unable to find track on YouTube")
ErrUnableToGetYoutubeStream = errors.New("unable to get YouTube stream")
ErrDecodingApiResponse = errors.New("error decoding API response")
)
// distance between two integers
func iDist(a, b int) int {
if a > b {
return a - b
} else {
return b - a
}
}
func containsIgnoreCase(s, substr string) bool {
return strings.Contains(strings.ToUpper(s), strings.ToUpper(substr))
}
type sessionData struct {
AccessToken string `json:"accessToken"`
AccessTokenExpirationTimestampMs int64 `json:"accessTokenExpirationTimestampMs"`
}
type apiToken struct {
token string
expires time.Time
}
func updateApiToken(token *apiToken) error {
if time.Now().Before(token.expires) {
// Token already up-to-date
return nil
}
// Get new token
var data sessionData
var funcErr error
err := exutil.GetHTMLScriptFunc("https://open.spotify.com", false, func(code string) bool {
if strings.HasPrefix(code, "{\"accessToken\":\"") {
// Parse session data
if err := json.Unmarshal([]byte(code), &data); err != nil {
funcErr = err
return false
}
return false
}
return true
})
if err != nil {
return err
}
if funcErr != nil {
return funcErr
}
*token = apiToken{
token: data.AccessToken,
expires: time.UnixMilli(data.AccessTokenExpirationTimestampMs),
}
return nil
}
type trackData struct {
Artists []struct {
Name string `json:"name"`
} `json:"artists"`
DurationMs int `json:"duration_ms"`
ExternalUrls struct {
Spotify string `json:"spotify"`
} `json:"external_urls"`
Name string `json:"name"`
}
func (d trackData) artistsString() (res string) {
for i, v := range d.Artists {
if i != 0 {
res += ", "
}
res += v.Name
}
return
}
func (d trackData) titleString() string {
return d.artistsString() + " - " + d.Name
}
func getTrack(e *Extractor, trackId string) (extractor.Data, error) {
if err := updateApiToken(&e.token); err != nil {
return extractor.Data{}, err
}
// Make API request for track info
req, err := http.NewRequest("GET", "https://api.spotify.com/v1/tracks/"+trackId, nil)
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Authorization", "Bearer "+e.token.token)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return extractor.Data{}, err
}
defer resp.Body.Close()
// Parse track info
var data trackData
dec := json.NewDecoder(resp.Body)
if err := dec.Decode(&data); err != nil {
return extractor.Data{}, ErrDecodingApiResponse
}
if len(data.Artists) == 0 {
return extractor.Data{}, ErrInvalidTrackData
}
// Search for track on YouTube
results, err := e.ytSearcher.Search(e.ytSearcherConfig, data.Name+" - "+data.artistsString())
if err != nil {
return extractor.Data{}, err
}
if len(results) == 0 {
return extractor.Data{}, ErrTrackNotFound
}
// Lower is better
score := func(ytd extractor.Data, resIdx int) (score int) {
// This function determines the likelihood of a given YouTube video
// belonging to the Spotify song.
// It may look pretty complicated, but here's the gist:
// - lower scores are better
// - the general formula is: resIdx - matchAccuracy / penalty
// where 'resIdx' is the position in the search results,
// 'matchAccuracy' is how well the video superficially matches
// with the Spotify song (title, artists, duration) and 'penalty'
// measures the hints pointing to the current video being the
// wrong one (awfully wrong duration, instrumental version, remix
// etc.)
// - if the video is from an official artist channel, that makes the
// penalty points even more credible, so they're squared
// - accuracy and penalty points are multiplicative; this makes them
// have exponentially more weight the more they are given
matchAccuracy := 1.0
matchPenalty := 1.0
sqrPenalty := false
if ytd.OfficialArtist || strings.HasSuffix(ytd.Uploader, " - Topic") {
matchAccuracy *= 4.0
sqrPenalty = true
}
if containsIgnoreCase(ytd.Title, data.Name) {
matchAccuracy *= 4.0
}
matchingArtists := 0.0
firstMatches := false
for i, artist := range data.Artists {
if containsIgnoreCase(ytd.Uploader, artist.Name) ||
containsIgnoreCase(ytd.Title, artist.Name) {
matchingArtists += 1.0
if i == 0 {
firstMatches = true
}
}
}
if firstMatches {
matchAccuracy *= 2.0
}
matchAccuracy *= 2.0 * (matchingArtists / float64(len(data.Artists)))
durationDist := iDist(ytd.Duration, data.DurationMs/1000)
if durationDist <= 5 {
matchAccuracy *= 8.0
} else if durationDist >= 300 {
matchPenalty *= 16.0
}
spotiArtists := data.artistsString()
onlyYtTitleContains := func(s string) bool {
return !containsIgnoreCase(data.Name, s) &&
!containsIgnoreCase(spotiArtists, s) &&
containsIgnoreCase(ytd.Title, s)
}
if onlyYtTitleContains("instrumental") || onlyYtTitleContains("cover") ||
onlyYtTitleContains("live") || onlyYtTitleContains("album") {
matchPenalty *= 8.0
}
if onlyYtTitleContains("remix") || onlyYtTitleContains("rmx") {
matchPenalty *= 8.0
} else if onlyYtTitleContains("mix") {
matchPenalty *= 6.0
}
if onlyYtTitleContains("vip") {
matchPenalty *= 6.0
}
totalPenalty := matchPenalty
if sqrPenalty {
totalPenalty *= totalPenalty
}
return resIdx - int(matchAccuracy/totalPenalty)
}
// Select the result with the lowest (best) score
lowestIdx := -1
lowest := 2147483647
for i, v := range results {
score := score(v, i)
//fmt.Println(i, score, v)
if score < lowest {
lowestIdx = i
lowest = score
}
}
ytData, err := e.ytExtractor.Extract(e.ytExtractorConfig, results[lowestIdx].SourceUrl)
if err != nil {
return extractor.Data{}, err
}
if len(ytData) != 1 {
return extractor.Data{}, ErrUnableToGetYoutubeStream
}
return extractor.Data{
SourceUrl: data.ExternalUrls.Spotify,
StreamUrl: ytData[0].StreamUrl,
Title: data.titleString(),
Uploader: data.artistsString(),
Duration: ytData[0].Duration,
Expires: ytData[0].Expires,
}, nil
}
type playlistData struct {
ExternalUrls struct {
Spotify string `json:"spotify"`
} `json:"external_urls"`
Name string `json:"name"`
Tracks struct {
Items []struct {
Track trackData `json:"track"`
} `json:"items"`
Next string `json:"next"`
} `json:"tracks"`
}
func getPlaylist(e *Extractor, playlistId string) ([]extractor.Data, error) {
if err := updateApiToken(&e.token); err != nil {
return nil, err
}
var data playlistData
trackOnlyReq := false
reqUrl := "https://api.spotify.com/v1/playlists/" + playlistId
var res []extractor.Data
for {
// Make API request for playlist info
req, err := http.NewRequest("GET", reqUrl, nil)
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Authorization", "Bearer "+e.token.token)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
// Parse playlist info
dec := json.NewDecoder(resp.Body)
if trackOnlyReq {
// JSON decoder doesn't always overwrite the set value
data.Tracks.Next = ""
data.Tracks.Items = nil
err = dec.Decode(&data.Tracks)
} else {
err = dec.Decode(&data)
}
if err != nil {
return nil, ErrDecodingApiResponse
}
for _, v := range data.Tracks.Items {
res = append(res, extractor.Data{
SourceUrl: v.Track.ExternalUrls.Spotify,
Title: v.Track.titleString(),
Uploader: v.Track.artistsString(),
PlaylistUrl: data.ExternalUrls.Spotify,
PlaylistTitle: data.Name,
})
}
if data.Tracks.Next == "" {
break
} else {
reqUrl = data.Tracks.Next
trackOnlyReq = true
}
}
return res, nil
}
type albumData struct {
ExternalUrls struct {
Spotify string `json:"spotify"`
} `json:"external_urls"`
Name string `json:"name"`
Tracks struct {
Items []trackData `json:"items"`
Next string `json:"next"`
} `json:"tracks"`
}
func getAlbum(e *Extractor, albumId string) ([]extractor.Data, error) {
// This function is pretty much copied from getPlaylist, with minor
// modifications
if err := updateApiToken(&e.token); err != nil {
return nil, err
}
var data albumData
trackOnlyReq := false
reqUrl := "https://api.spotify.com/v1/albums/" + albumId
var res []extractor.Data
for {
// Make API request for album info
req, err := http.NewRequest("GET", reqUrl, nil)
req.Header.Add("Content-Type", "application/json")
req.Header.Add("Authorization", "Bearer "+e.token.token)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
// Parse album info
dec := json.NewDecoder(resp.Body)
if trackOnlyReq {
// JSON decoder doesn't always overwrite the set value
data.Tracks.Next = ""
data.Tracks.Items = nil
err = dec.Decode(&data.Tracks)
} else {
err = dec.Decode(&data)
}
if err != nil {
return nil, ErrDecodingApiResponse
}
for _, v := range data.Tracks.Items {
res = append(res, extractor.Data{
SourceUrl: v.ExternalUrls.Spotify,
Title: v.titleString(),
Uploader: v.artistsString(),
PlaylistUrl: data.ExternalUrls.Spotify,
PlaylistTitle: data.Name,
})
}
if data.Tracks.Next == "" {
break
} else {
reqUrl = data.Tracks.Next
trackOnlyReq = true
}
}
return res, nil
}

59
extractor/util/util.go Normal file
View File

@ -0,0 +1,59 @@
package util
import (
"golang.org/x/net/html"
"net/http"
)
// Retrieve JavaScript embedded in HTML
func GetHTMLScriptFunc(url string, readCodeLineByLine bool, codeFunc func(code string) bool) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
z := html.NewTokenizer(resp.Body)
isScript := false
for {
tt := z.Next()
switch tt {
case html.ErrorToken:
return z.Err()
case html.TextToken:
if codeFunc != nil && isScript {
t := string(z.Text())
if readCodeLineByLine {
// NOTE: a bufio line scanner doesn't work (bufio.Scanner: token too long); maybe this is a bug
// Iterate over each line in the script
ls := 0 // line start
le := 0 // line end
for ls < len(t) {
if le == len(t) || t[le] == '\n' {
ln := t[ls:le]
if !codeFunc(ln) {
return nil
}
ls = le + 1
}
le++
}
} else {
if !codeFunc(t) {
return nil
}
}
}
case html.StartTagToken, html.EndTagToken:
tn, _ := z.TagName()
if string(tn) == "script" {
isScript = tt == html.StartTagToken
}
}
}
}

102
extractor/youtube/providers.go Normal file
View File

@ -0,0 +1,102 @@
package youtube
import (
"git.nobrain.org/r4/dischord/extractor"
"errors"
"net/url"
)
func init() {
extractor.AddExtractor("youtube", &Extractor{})
extractor.AddSearcher("youtube-search", &Searcher{})
extractor.AddSuggestor("youtube-search-suggestions", &Suggestor{})
}
type matchType int
const (
matchTypeNone matchType = iota
matchTypeVideo
matchTypePlaylist
)
var (
ErrInvalidInput = errors.New("invalid input")
)
func matches(requireDirectPlaylistUrl bool, input string) matchType {
u, err := url.Parse(input)
if err != nil {
return matchTypeNone
}
if u.Scheme != "http" && u.Scheme != "https" {
return matchTypeNone
}
q, err := url.ParseQuery(u.RawQuery)
if err != nil {
return matchTypeNone
}
switch u.Host {
case "www.youtube.com", "youtube.com":
if u.Path != "/watch" && u.Path != "/playlist" {
return matchTypeNone
}
if q.Has("list") && (!requireDirectPlaylistUrl || u.Path == "/playlist") {
return matchTypePlaylist
}
return matchTypeVideo
case "youtu.be":
return matchTypeVideo
default:
return matchTypeNone
}
}
type Extractor struct {
decryptor decryptor
}
func (e *Extractor) DefaultConfig() extractor.ProviderConfig {
return extractor.ProviderConfig{
"require-direct-playlist-url": false,
}
}
func (e *Extractor) Matches(cfg extractor.ProviderConfig, input string) bool {
return matches(cfg["require-direct-playlist-url"].(bool), input) != matchTypeNone
}
func (e *Extractor) Extract(cfg extractor.ProviderConfig, input string) ([]extractor.Data, error) {
switch matches(cfg["require-direct-playlist-url"].(bool), input) {
case matchTypeVideo:
d, err := getVideo(&e.decryptor, input)
if err != nil {
return nil, err
}
return []extractor.Data{d}, nil
case matchTypePlaylist:
return getPlaylist(input)
}
return nil, ErrInvalidInput
}
type Searcher struct{}
func (s *Searcher) DefaultConfig() extractor.ProviderConfig {
return extractor.ProviderConfig{}
}
func (s *Searcher) Search(cfg extractor.ProviderConfig, input string) ([]extractor.Data, error) {
return getSearch(input)
}
type Suggestor struct{}
func (s *Suggestor) DefaultConfig() extractor.ProviderConfig {
return extractor.ProviderConfig{}
}
func (s *Suggestor) Suggest(cfg extractor.ProviderConfig, input string) ([]string, error) {
return getSearchSuggestions(input)
}

58
extractor/youtube/util.go Normal file
View File

@ -0,0 +1,58 @@
package youtube
import (
"golang.org/x/net/html"
"net/http"
)
func getHTMLScriptFunc(url string, readCodeLineByLine bool, codeFunc func(code string) bool) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
z := html.NewTokenizer(resp.Body)
isScript := false
for {
tt := z.Next()
switch tt {
case html.ErrorToken:
return z.Err()
case html.TextToken:
if codeFunc != nil && isScript {
t := string(z.Text())
if readCodeLineByLine {
// NOTE: a bufio line scanner doesn't work (bufio.Scanner: token too long); maybe this is a bug
// Iterate over each line in the script
ls := 0 // line start
le := 0 // line end
for ls < len(t) {
if le == len(t) || t[le] == '\n' {
ln := t[ls:le]
if !codeFunc(ln) {
return nil
}
ls = le + 1
}
le++
}
} else {
if !codeFunc(t) {
return nil
}
}
}
case html.StartTagToken, html.EndTagToken:
tn, _ := z.TagName()
if string(tn) == "script" {
isScript = tt == html.StartTagToken
}
}
}
}

416
extractor/youtube/youtube.go Normal file
View File

@ -0,0 +1,416 @@
package youtube
import (
"git.nobrain.org/r4/dischord/extractor"
exutil "git.nobrain.org/r4/dischord/extractor/util"
"git.nobrain.org/r4/dischord/util"
"encoding/json"
"errors"
"io"
"net/http"
"net/url"
"strconv"
"strings"
"time"
)
var (
ErrNoSuitableFormat = errors.New("no suitable audio-only format found")
ErrGettingUrlFromSignatureCipher = errors.New("error getting URL from signature cipher")
ErrDecryptFunctionBroken = errors.New("signature decryptor function is broken (perhaps the extractor is out of date)")
ErrMalformedJson = errors.New("malformed JSON")
)
type playerData struct {
StreamingData struct {
ExpiresInSeconds string `json:"expiresInSeconds"`
Formats []struct {
Url string `json:"url"`
SignatureCipher string `json:"signatureCipher"`
MimeType string `json:"mimeType"`
Bitrate int `json:"bitrate"`
ApproxDurationMs string `json:"approxDurationMs"`
AudioSampleRate string `json:"audioSampleRate"`
AudioChannels int `json:"audioChannels"`
} `json:"formats"`
AdaptiveFormats []struct {
Url string `json:"url"`
SignatureCipher string `json:"signatureCipher"`
MimeType string `json:"mimeType"`
Bitrate int `json:"bitrate"`
ApproxDurationMs string `json:"approxDurationMs"`
AudioSampleRate string `json:"audioSampleRate"`
AudioChannels int `json:"audioChannels"`
} `json:"adaptiveFormats"`
} `json:"streamingData"`
VideoDetails struct {
VideoId string `json:"videoId"`
Title string `json:"title"`
LengthSeconds string `json:"lengthSeconds"`
ShortDescription string `json:"shortDescription"`
Author string `json:"author"`
} `json:"videoDetails"`
}
func getVideo(decryptor *decryptor, vUrl string) (extractor.Data, error) {
try := func() (extractor.Data, error) {
// Get JSON string from YouTube
v, err := getJSVar(vUrl, "ytInitialPlayerResponse")
if err != nil {
return extractor.Data{}, err
}
// Parse player data scraped from YouTube
var data playerData
if err := json.Unmarshal([]byte(v), &data); err != nil {
return extractor.Data{}, err
}
// Get audio format with maximum bitrate
maxBr := -1
for i, f := range data.StreamingData.AdaptiveFormats {
if strings.HasPrefix(f.MimeType, "audio/") {
if maxBr == -1 || f.Bitrate > data.StreamingData.AdaptiveFormats[maxBr].Bitrate {
maxBr = i
}
}
}
if maxBr == -1 {
return extractor.Data{}, ErrNoSuitableFormat
}
duration, err := strconv.Atoi(data.VideoDetails.LengthSeconds)
if err != nil {
duration = -1
}
expires, err := strconv.Atoi(data.StreamingData.ExpiresInSeconds)
if err != nil {
return extractor.Data{}, err
}
ft := data.StreamingData.AdaptiveFormats[maxBr]
var resUrl string
if ft.Url != "" {
resUrl = ft.Url
} else {
// For music, YouTube makes getting the resource URL a bit trickier
q, err := url.ParseQuery(ft.SignatureCipher)
if err != nil {
return extractor.Data{}, ErrGettingUrlFromSignatureCipher
}
sig := q.Get("s")
sigParam := q.Get("sp")
baseUrl := q.Get("url")
sigDecrypted, err := decryptor.decrypt(sig)
if err != nil {
return extractor.Data{}, err
}
resUrl = baseUrl + "&" + sigParam + "=" + sigDecrypted
}
return extractor.Data{
SourceUrl: vUrl,
StreamUrl: resUrl,
Title: data.VideoDetails.Title,
Description: data.VideoDetails.ShortDescription,
Uploader: data.VideoDetails.Author,
Duration: duration,
Expires: time.Now().Add(time.Duration(expires) * time.Second),
}, nil
}
isOk := func(strmUrl string) bool {
resp, err := http.Get(strmUrl)
if err != nil {
return false
}
defer resp.Body.Close()
return resp.StatusCode == 200
}
// Sometimes we just get an invalid stream URL, and I didn't find anything
// simple to do about it, so we just try the stream URL we get and repeat
// if it's invalid
for tries := 0; tries < 10; tries++ {
data, err := try()
if err != nil {
return extractor.Data{}, err
}
if isOk(data.StreamUrl) {
return data, nil
}
}
return extractor.Data{}, ErrDecryptFunctionBroken
}
type playlistVideoData struct {
Contents struct {
TwoColumnWatchNextResults struct {
Playlist struct {
Playlist struct {
Title string `json:"title"`
Contents []struct {
PlaylistPanelVideoRenderer struct {
NavigationEndpoint struct {
WatchEndpoint struct {
VideoId string `json:"videoId"`
Index int `json:"index"`
} `json:"watchEndpoint"`
} `json:"navigationEndpoint"`
Title struct {
SimpleText string `json:"simpleText"`
} `json:"title"`
ShortBylineText struct {
Runs []struct {
Text string `json:"text"` // uploader name
} `json:"runs"`
} `json:"shortBylineText"`
LengthText struct {
SimpleText string `json:"simpleText"`
} `json:"lengthText"`
} `json:"playlistPanelVideoRenderer"`
} `json:"contents"`
} `json:"playlist"`
} `json:"playlist"`
} `json:"twoColumnWatchNextResults"`
} `json:"contents"`
}
// Only gets superficial data, the actual stream URL must be extracted from SourceUrl
func getPlaylist(pUrl string) ([]extractor.Data, error) {
u, err := url.Parse(pUrl)
if err != nil {
return nil, err
}
q, err := url.ParseQuery(u.RawQuery)
if err != nil {
return nil, err
}
listId := q.Get("list")
vidId := ""
index := 0
var res []extractor.Data
// This loop uses the playlist sidebar: each video played in the context
// of a playlist loads 100 or so of the following videos' infos, which we
// add to the returned slice; then we take the last retrieved video's infos
// and use its sidebar and so on
for {
vUrl := "https://www.youtube.com/watch?v=" + vidId + "&list=" + listId + "&index=" + strconv.Itoa(index+1)
// Get JSON string from YouTube
v, err := getJSVar(vUrl, "ytInitialData")
if err != nil {
return nil, err
}
// Parse playlist data scraped from YouTube
var data playlistVideoData
if err := json.Unmarshal([]byte(v), &data); err != nil {
return nil, err
}
added := false
for _, v := range data.Contents.TwoColumnWatchNextResults.Playlist.Playlist.Contents {
vidId = v.PlaylistPanelVideoRenderer.NavigationEndpoint.WatchEndpoint.VideoId
index = v.PlaylistPanelVideoRenderer.NavigationEndpoint.WatchEndpoint.Index
if index == len(res) {
srcUrl := "https://www.youtube.com/watch?v=" + vidId
bylineText := v.PlaylistPanelVideoRenderer.ShortBylineText
if len(bylineText.Runs) == 0 {
return nil, ErrMalformedJson
}
uploader := bylineText.Runs[0].Text
length, err := util.ParseDurationSeconds(v.PlaylistPanelVideoRenderer.LengthText.SimpleText)
if err != nil {
length = -1
}
res = append(res, extractor.Data{
SourceUrl: srcUrl,
Title: v.PlaylistPanelVideoRenderer.Title.SimpleText,
PlaylistUrl: "https://www.youtube.com/playlist?list=" + listId,
PlaylistTitle: data.Contents.TwoColumnWatchNextResults.Playlist.Playlist.Title,
Uploader: uploader,
Duration: length,
})
added = true
}
}
if !added {
break
}
}
return res, nil
}
type searchData struct {
Contents struct {
TwoColumnSearchResultsRenderer struct {
PrimaryContents struct {
SectionListRenderer struct {
Contents []struct {
ItemSectionRenderer struct {
Contents []struct {
PlaylistRenderer struct {
PlaylistId string `json:"playlistId"`
Title struct {
SimpleText string `json:"simpleText"`
} `json:"title"`
} `json:"playlistRenderer"`
VideoRenderer struct {
VideoId string `json:"videoId"`
Title struct {
Runs []struct {
Text string `json:"text"`
} `json:"runs"`
} `json:"title"`
LongBylineText struct {
Runs []struct {
Text string `json:"text"` // uploader name
} `json:"runs"`
} `json:"longBylineText"`
LengthText struct {
SimpleText string `json:"simpleText"`
} `json:"lengthText"`
OwnerBadges []struct {
MetadataBadgeRenderer struct {
Style string `json:"style"`
} `json:"metadataBadgeRenderer"`
} `json:"OwnerBadges"`
} `json:"videoRenderer"`
} `json:"contents"`
} `json:"itemSectionRenderer"`
} `json:"contents"`
} `json:"sectionListRenderer"`
} `json:"primaryContents"`
} `json:"twoColumnSearchResultsRenderer"`
} `json:"contents"`
}
// Only gets superficial data, the actual stream URL must be extracted from SourceUrl
func getSearch(query string) ([]extractor.Data, error) {
// Get JSON string from YouTube
sanitizedQuery := url.QueryEscape(strings.ReplaceAll(query, " ", "+"))
queryUrl := "https://www.youtube.com/results?search_query=" + sanitizedQuery
v, err := getJSVar(queryUrl, "ytInitialData")
if err != nil {
return nil, err
}
// Parse search data scraped from YouTube
var data searchData
if err := json.Unmarshal([]byte(v), &data); err != nil {
return nil, err
}
var res []extractor.Data
for _, v0 := range data.Contents.TwoColumnSearchResultsRenderer.PrimaryContents.SectionListRenderer.Contents {
for _, v1 := range v0.ItemSectionRenderer.Contents {
if v1.VideoRenderer.VideoId != "" {
titleRuns := v1.VideoRenderer.Title.Runs
if len(titleRuns) == 0 {
return nil, ErrMalformedJson
}
title := titleRuns[0].Text
bylineText := v1.VideoRenderer.LongBylineText
if len(bylineText.Runs) == 0 {
return nil, ErrMalformedJson
}
uploader := bylineText.Runs[0].Text
length, err := util.ParseDurationSeconds(v1.VideoRenderer.LengthText.SimpleText)
if err != nil {
length = -1
}
badges := v1.VideoRenderer.OwnerBadges
res = append(res, extractor.Data{
SourceUrl: "https://www.youtube.com/watch?v=" + v1.VideoRenderer.VideoId,
Title: title,
Duration: length,
Uploader: uploader,
OfficialArtist: len(badges) != 0 && badges[0].MetadataBadgeRenderer.Style == "BADGE_STYLE_TYPE_VERIFIED_ARTIST",
})
} else if v1.PlaylistRenderer.PlaylistId != "" {
res = append(res, extractor.Data{
PlaylistUrl: "https://www.youtube.com/playlist?list=" + v1.PlaylistRenderer.PlaylistId,
PlaylistTitle: v1.PlaylistRenderer.Title.SimpleText,
})
}
}
}
return res, nil
}
func getSearchSuggestions(query string) ([]string, error) {
url := "https://suggestqueries-clients6.youtube.com/complete/search?client=youtube&ds=yt&q=" + url.QueryEscape(query)
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
raw, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
raw = []byte(strings.TrimSuffix(strings.TrimPrefix(string(raw), "window.google.ac.h("), ")"))
var data []any
if err := json.Unmarshal(raw, &data); err != nil {
return nil, err
}
if len(data) != 3 {
return nil, ErrMalformedJson
}
rawSuggestions, ok := data[1].([]any)
if !ok {
return nil, ErrMalformedJson
}
var res []string
for _, v := range rawSuggestions {
rawSuggestion, ok := v.([]any)
if !ok || len(rawSuggestion) != 3 {
return nil, ErrMalformedJson
}
suggestion, ok := rawSuggestion[0].(string)
if !ok {
return nil, ErrMalformedJson
}
res = append(res, suggestion)
}
return res, nil
}
// Gets a constant JavaScript variable's value from a URL and a variable name
// (variable format must be: var someVarName = {"somekey": "lol"};)
func getJSVar(url, varName string) (string, error) {
match := "var " + varName + " = "
var res string
err := exutil.GetHTMLScriptFunc(url, true, func(code string) bool {
if strings.HasPrefix(code, match) {
res = strings.TrimRight(code[len(match):], ";")
return false
}
return true
})
if err != nil {
return "", err
}
return res, nil
}

245
extractor/youtube/youtube_decrypt.go Normal file
View File

@ -0,0 +1,245 @@
package youtube
import (
exutil "git.nobrain.org/r4/dischord/extractor/util"
"encoding/json"
"errors"
"io"
"net/http"
"regexp"
"strconv"
"strings"
)
var (
ErrDecryptGettingFunctionName = errors.New("error getting signature decryption function name")
ErrDecryptGettingFunction = errors.New("error getting signature decryption function")
ErrDecryptGettingOpTable = errors.New("error getting signature decryption operation table")
ErrGettingBaseJs = errors.New("unable to get base.js")
)
type decryptorOp struct {
fn func(a *string, b int)
arg int
}
type decryptor struct {
// base.js version ID, used for caching
versionId string
// The actual decryption algorithm can be split up into a list of known
// operations
ops []decryptorOp
}
func (d *decryptor) decrypt(input string) (string, error) {
if err := updateDecryptor(d); err != nil {
return "", err
}
s := input
for _, op := range d.ops {
op.fn(&s, op.arg)
}
return s, nil
}
type configData struct {
PlayerJsUrl string `json:"PLAYER_JS_URL"`
}
func updateDecryptor(d *decryptor) error {
prefix := "(function() {window.ytplayer={};\nytcfg.set("
endStr := ");"
// Get base.js URL
var url string
var funcErr error
err := exutil.GetHTMLScriptFunc("https://www.youtube.com", false, func(code string) bool {
if strings.HasPrefix(code, prefix) {
// Cut out the JSON part
code = code[len(prefix):]
end := strings.Index(code, endStr)
if end == -1 {
funcErr = ErrGettingBaseJs
return false
}
// Parse config data
var data configData
if err := json.Unmarshal([]byte(code[:end]), &data); err != nil {
funcErr = ErrGettingBaseJs
return false
}
url = "https://www.youtube.com" + data.PlayerJsUrl
return false
}
return true
})
if err != nil {
return err
}
if funcErr != nil {
return err
}
// Get base.js version ID
sp := strings.SplitN(strings.TrimPrefix(url, "/s/player/"), "/", 2)
if len(sp) != 2 {
return ErrGettingBaseJs
}
verId := sp[0]
if d.versionId == verId {
// Decryptor already up-to-date
return nil
}
// Get base.js contents
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return ErrGettingBaseJs
}
// Copy contents to buffer
buf := new(strings.Builder)
_, err = io.Copy(buf, resp.Body)
if err != nil {
return err
}
// Get decryption operations
ops, err := getDecryptOps(buf.String())
if err != nil {
return err
}
d.versionId = verId
d.ops = ops
return nil
}
var decryptFunctionNameRegexp = regexp.MustCompile(`[a-zA-Z]*&&\([a-zA-Z]*=([a-zA-Z]*)\(decodeURIComponent\([a-zA-Z]*\)\),[a-zA-Z]*\.set\([a-zA-Z]*,encodeURIComponent\([a-zA-Z]*\)\)\)`)
func getDecryptFunction(baseJs string) (string, error) {
idx := decryptFunctionNameRegexp.FindSubmatchIndex([]byte(baseJs))
if len(idx) != 4 {
return "", ErrDecryptGettingFunctionName
}
fnName := baseJs[idx[2]:idx[3]]
startMatch := fnName + `=function(a){a=a.split("");`
endMatch := `;return a.join("")};`
start := strings.Index(baseJs, startMatch)
if start == -1 {
return "", ErrDecryptGettingFunction
}
fn := baseJs[start+len(startMatch):]
end := strings.Index(fn, endMatch)
if start == -1 {
return "", ErrDecryptGettingFunction
}
return fn[:end], nil
}
func getDecryptOps(baseJs string) ([]decryptorOp, error) {
// Extract main decryptor function JS
decrFn, err := getDecryptFunction(baseJs)
if err != nil {
return nil, err
}
// Get decyptor operation JS
var ops string
{
sp := strings.SplitN(decrFn, ".", 2)
if len(sp) != 2 {
return nil, ErrDecryptGettingOpTable
}
opsObjName := sp[0]
startMatch := `var ` + opsObjName + `={`
endMatch := `};`
start := strings.Index(baseJs, startMatch)
if start == -1 {
return nil, ErrDecryptGettingOpTable
}
ops = baseJs[start+len(startMatch):]
end := strings.Index(ops, endMatch)
if start == -1 {
return nil, ErrDecryptGettingOpTable
}
ops = ops[:end]
}
// Make a decryptor operation table that associates the operation
// names with a specific action on an input string
opTable := make(map[string]func(a *string, b int))
{
lns := strings.Split(ops, "\n")
if len(lns) != 3 {
return nil, ErrDecryptGettingOpTable
}
for _, ln := range lns {
sp := strings.Split(ln, ":")
if len(sp) != 2 {
return nil, ErrDecryptGettingOpTable
}
name := sp[0]
fn := sp[1]
switch {
case strings.HasPrefix(fn, `function(a){a.reverse()}`):
opTable[name] = func(a *string, b int) {
// Reverse a
var res string
for _, c := range *a {
res = string(c) + res
}
*a = res
}
case strings.HasPrefix(fn, `function(a,b){var c=a[0];a[0]=a[b%a.length];a[b%a.length]=c}`):
opTable[name] = func(a *string, b int) {
// Swap a[0] and a[b % len(a)]
c := []byte(*a)
c[0], c[b%len(*a)] = c[b%len(*a)], c[0]
*a = string(c)
}
case strings.HasPrefix(fn, `function(a,b){a.splice(0,b)}`):
opTable[name] = func(a *string, b int) {
// Slice off all elements of a up to a[b]
*a = (*a)[b:]
}
}
}
}
// Parse all operations in the main decryptor function and return them in
// order
var res []decryptorOp
for _, fn := range strings.Split(decrFn, ";") {
sp := strings.SplitN(fn, ".", 2)
if len(sp) != 2 {
return nil, ErrDecryptGettingOpTable
}
sp = strings.SplitN(sp[1], "(", 2)
if len(sp) != 2 {
return nil, ErrDecryptGettingOpTable
}
name := sp[0]
argS := strings.TrimSuffix(strings.TrimPrefix(sp[1], "a,"), ")")
arg, err := strconv.Atoi(argS)
if err != nil {
return nil, ErrDecryptGettingOpTable
}
callableOp, exists := opTable[name]
if !exists {
return nil, ErrDecryptGettingOpTable
}
res = append(res, decryptorOp{callableOp, arg})
}
return res, nil
}

35
extractor/ytdl/providers.go Normal file
View File

@ -0,0 +1,35 @@
package ytdl
import (
"git.nobrain.org/r4/dischord/extractor"
"strings"
)
func init() {
extractor.AddExtractor("youtube-dl", &Extractor{})
}
type Extractor struct{}
func (e *Extractor) DefaultConfig() extractor.ProviderConfig {
return extractor.ProviderConfig{
"youtube-dl-path": "youtube-dl",
}
}
func (e *Extractor) Matches(cfg extractor.ProviderConfig, input string) bool {
return strings.HasPrefix(input, "http://") || strings.HasPrefix(input, "https://")
}
func (e *Extractor) Extract(cfg extractor.ProviderConfig, input string) ([]extractor.Data, error) {
var res []extractor.Data
dch, errch := ytdlGet(cfg["youtube-dl-path"].(string), input)
for v := range dch {
res = append(res, v)
}
for err := range errch {
return nil, err
}
return res, nil
}

135
extractor/ytdl/ytdl.go Normal file
View File

@ -0,0 +1,135 @@
package ytdl
import (
"git.nobrain.org/r4/dischord/extractor"
"bufio"
"encoding/json"
"errors"
"os/exec"
"strings"
"time"
)
var (
ErrUnsupportedUrl = errors.New("unsupported URL")
)
// A very reduced version of the JSON structure returned by youtube-dl
type ytdlMetadata struct {
Title string `json:"title"`
Extractor string `json:"extractor"`
Duration float32 `json:"duration"`
WebpageUrl string `json:"webpage_url"`
Playlist string `json:"playlist"`
Uploader string `json:"uploader"`
Description string `json:"description"`
Formats []struct {
Url string `json:"url"`
Format string `json"format"`
VCodec string `json:"vcodec"`
} `json:"formats"`
}
// Gradually sends all audio URLs through the string channel. If an error occurs, it is sent through the
// error channel. Both channels are closed after either an error occurs or all URLs have been output.
func ytdlGet(youtubeDLPath, input string) (<-chan extractor.Data, <-chan error) {
out := make(chan extractor.Data)
errch := make(chan error, 1)
go func() {
defer close(out)
defer close(errch)
// Set youtube-dl args
var ytdlArgs []string
ytdlArgs = append(ytdlArgs, "-j", input)
// Prepare command for execution
cmd := exec.Command(youtubeDLPath, ytdlArgs...)
cmd.Env = []string{"LC_ALL=en_US.UTF-8"} // Youtube-dl doesn't recognize some chars if LC_ALL=C or not set at all
stdout, err := cmd.StdoutPipe()
if err != nil {
errch <- err
return
}
stderr, err := cmd.StderrPipe()
if err != nil {
errch <- err
return
}
// Catch any errors put out by youtube-dl
stderrReadDoneCh := make(chan struct{})
var ytdlError string
go func() {
sc := bufio.NewScanner(stderr)
for sc.Scan() {
line := sc.Text()
if strings.HasPrefix(line, "ERROR: ") {
ytdlError = strings.TrimPrefix(line, "ERROR: ")
}
}
stderrReadDoneCh <- struct{}{}
}()
// Start youtube-dl
if err := cmd.Start(); err != nil {
errch <- err
return
}
// We want to let our main loop know when youtube-dl is done
donech := make(chan error)
go func() {
donech <- cmd.Wait()
}()
// Main JSON decoder loop
dec := json.NewDecoder(stdout)
for dec.More() {
// Read JSON
var m ytdlMetadata
if err := dec.Decode(&m); err != nil {
errch <- err
return
}
// Extract URL from metadata (the latter formats are always the better with youtube-dl)
for i := len(m.Formats) - 1; i >= 0; i-- {
format := m.Formats[i]
if format.VCodec == "none" {
out <- extractor.Data{
SourceUrl: m.WebpageUrl,
StreamUrl: format.Url,
Title: m.Title,
PlaylistTitle: m.Playlist,
Description: m.Description,
Uploader: m.Uploader,
Duration: int(m.Duration),
Expires: time.Now().Add(10 * 365 * 24 * time.Hour),
}
break
}
}
}
// Wait for command to finish executing and catch any errors
err = <-donech
<-stderrReadDoneCh
if err != nil {
if ytdlError == "" {
errch <- err
} else {
if strings.HasPrefix(ytdlError, "Unsupported URL: ") {
errch <- ErrUnsupportedUrl
} else {
errch <- errors.New("ytdl: " + ytdlError)
}
}
return
}
}()
return out, errch
}

16
go.mod Normal file
View File

@ -0,0 +1,16 @@
module dischord
go 1.18
require (
github.com/BurntSushi/toml v1.2.0
github.com/bwmarrin/discordgo v0.25.0
github.com/ulikunitz/xz v0.5.10
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
)
require (
github.com/gorilla/websocket v1.4.2 // indirect
golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b // indirect
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 // indirect
)

17
go.sum Normal file
View File

@ -0,0 +1,17 @@
github.com/BurntSushi/toml v1.2.0 h1:Rt8g24XnyGTyglgET/PRUNlrUeu9F5L+7FilkXfZgs0=
github.com/BurntSushi/toml v1.2.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
github.com/bwmarrin/discordgo v0.25.0 h1:NXhdfHRNxtwso6FPdzW2i3uBvvU7UIQTghmV2T4nqAs=
github.com/bwmarrin/discordgo v0.25.0/go.mod h1:NJZpH+1AfhIcyQsPeuBKsUtYrRnjkyu0kIVMCHkZtRY=
github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
github.com/ulikunitz/xz v0.5.10 h1:t92gobL9l3HE202wg3rlk19F6X+JOxl9BBrCCMYEYd8=
github.com/ulikunitz/xz v0.5.10/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b h1:7mWr3k41Qtv8XlltBkDkl8LoP3mpSgBW8BUoxtEdbXg=
golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68 h1:nxC68pudNYkKU6jWhgrqdreuFiOQWj1Fs7T3VrH4Pjw=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

553
player/player.go Normal file
View File

@ -0,0 +1,553 @@
package player
import (
"git.nobrain.org/r4/dischord/audio"
"git.nobrain.org/r4/dischord/extractor"
"bytes"
"errors"
"fmt"
"math/rand"
"sort"
"time"
)
func init() {
rand.Seed(time.Now().UnixNano())
}
type Queue struct {
Done []extractor.Data
Playing *extractor.Data
Ahead []extractor.Data
AheadUnshuffled []extractor.Data
ShuffleOffset int
Paused bool
Loop bool
}
func (q *Queue) Copy() *Queue {
res := &Queue{
Done: append([]extractor.Data{}, q.Done...),
Playing: nil,
Ahead: append([]extractor.Data{}, q.Ahead...),
AheadUnshuffled: append([]extractor.Data{}, q.AheadUnshuffled...),
ShuffleOffset: q.ShuffleOffset,
Paused: q.Paused,
Loop: q.Loop,
}
if q.Playing != nil {
res.Playing = &extractor.Data{}
*res.Playing = *q.Playing
}
return res
}
func (q *Queue) InBounds(i int) bool {
return !(i == 0 && q.Playing == nil) &&
!(i < 0 && -i-1 >= len(q.Done)) &&
!(i > 0 && i-1 >= len(q.Ahead))
}
func (q *Queue) At(i int) *extractor.Data {
if !q.InBounds(i) {
return nil
}
if i < 0 {
return &q.Done[len(q.Done)+i]
} else if i == 0 {
return q.Playing
} else {
return &q.Ahead[i-1]
}
}
// Client commands
// Get commands can most easily be executed via the builtin convenience functions
// NOTE: When using commands like Jump, Swap and Delete, we can't be sure
// that our versions of the indices correspond to the versions the caller
// is referring to, but in this context, that should be fine
type Cmd interface{}
type CmdPlay struct{}
type CmdPause struct{}
type CmdLoop bool
type CmdJump int // relative track to jump to (e.g. -2, -1, 4)
type CmdSkipAll struct{}
type CmdShuffle struct{}
type CmdUnshuffle struct{}
type CmdSwap struct{ A, B int }
type CmdDelete []int
type CmdAddFront []extractor.Data
type CmdAddBack []extractor.Data
type CmdSeek float64 // seconds
type CmdSpeed float64 // speed factor
type CmdPlayFileAndStop struct {
DoneCh chan<- struct{}
Data []byte
}
type CmdGetTime chan<- float64
type CmdGetQueue chan<- *Queue
type CmdGetSpeed chan<- float64
type Client struct {
CmdCh chan<- Cmd
// ErrCh is blocking meaning that you will have to constantly read it,
// either using another goroutine or a select statement whenever sending a
// command.
ErrCh <-chan error
}
func (c Client) GetTime() float64 {
ch := make(chan float64)
c.CmdCh <- CmdGetTime(ch)
return <-ch
}
func (c Client) GetQueue() *Queue {
ch := make(chan *Queue)
c.CmdCh <- CmdGetQueue(ch)
return <-ch
}
func (c Client) GetSpeed() float64 {
ch := make(chan float64)
c.CmdCh <- CmdGetSpeed(ch)
return <-ch
}
type Event interface{}
type EventStreamUpdated struct{}
type EventKilled struct{}
type Callback interface{}
// Creates a new player client that will run in parallel and receive commands
// via the returned Client.CmdCh. All audio will be sent via the given outCh.
// Closing the returned Client.CmdCh channel acts as a kill signal.
func NewClient(excfg extractor.Config, ffmpegPath string, outCh chan<- []byte, callbacks ...Callback) Client {
// Client channels
cCmdCh := make(chan Cmd)
cErrCh := make(chan error)
// Callback setup
var callbacksStreamUpdated []func(EventStreamUpdated)
var callbacksKilled []func(EventKilled)
for _, c := range callbacks {
switch v := c.(type) {
case func(EventStreamUpdated):
callbacksStreamUpdated = append(callbacksStreamUpdated, v)
case func(EventKilled):
callbacksKilled = append(callbacksKilled, v)
default:
panic("player.NewClient(): invalid callback function type: " + fmt.Sprintf("%T", v))
}
}
go func() {
nFrames := 0
tStart := 0.0
playbackSpeed := 1.0
var queue Queue
lastStreamErr := time.Unix(0, 0)
var filePlaybackDoneCh chan<- struct{}
// Mostly notes to self:
// This entire setup is pretty fragile, so I'll try to explain it:
// Each stream consists of the three fundamental channels below.
// - audioch sends us the encoded audio frames; if audioch is closed,
// that means the stream exited successfully
// - errch sends any potential error (singular!): if any error occurs,
// the client automatically shuts down
// - killch is where we can send a manual kill signal; no error or
// shutdown confirmation will follow
//
// Now, it is important here that any time a stream is terminated (either
// by a user or the stream terminates itself by closing audio ch or
// sending an error) all three channels are set to nil. Otherwise (and
// I have spent lots of time debugging this), the goroutine will just
// lock up trying to send a kill signal through a channel which no
// longer has a receiver.
//
// To achieve a kind of stability, I try to follow the basics rule that:
// - any time I do manipulate queue.Playing, I kill the current
// stream first
// - there are exactly three ways a stream can end and all have to be
// handled separately: termination by the user (only through
// calling killStream), exiting with an error (handled in select:
// case err, ok := <-errch), and exiting successfully by closing
// audioch (handled in select: case cmd, ok := <-cCmdCh: if !ok)
var audioch <-chan []byte
var errch <-chan error
var killch chan<- struct{}
getPlaybackTime := func() float64 {
return tStart + float64(nFrames)*audio.FrameDuration*playbackSpeed
}
getMaxCachedPlaybackTime := func() float64 {
return tStart + float64(nFrames+len(audioch))*audio.FrameDuration*playbackSpeed
}
readAudioCh := func() <-chan []byte {
if queue.Paused {
return nil
} else {
return audioch
}
}
killStream := func() {
if killch != nil {
killch <- struct{}{}
audioch = nil
errch = nil
killch = nil
}
}
var jumpTracks func(nRel int)
refreshStream := func(seek float64, speed float64) {
if queue.Playing == nil {
// Reset stream info
nFrames = 0
tStart = 0.0
playbackSpeed = 1.0
} else {
// Kill the potential current stream
killStream()
// Refresh stream URL if necessary
if queue.Playing.StreamUrl == "" || time.Now().After(queue.Playing.Expires) {
var data []extractor.Data
var err error
for {
data, err = extractor.Extract(excfg, queue.Playing.SourceUrl)
if err == nil {
break
} else {
now := time.Now()
if lastStreamErr.Sub(now) > 5*time.Second {
lastStreamErr = now
continue
} else {
jumpTracks(1)
lastStreamErr = now
cErrCh <- errors.New("skipping stream due to multiple errors")
break
}
}
}
if err == nil {
if len(data) == 1 {
*queue.Playing = data[0]
} else {
cErrCh <- errors.New("got invalid data refreshing stream")
}
}
}
// Get new stream
audioch, errch, killch = audio.StreamToDiscordOpus(ffmpegPath, queue.Playing.StreamUrl, nil, seek, speed, true)
// Reset stream info
nFrames = 0
tStart = seek
playbackSpeed = speed
}
for _, c := range callbacksStreamUpdated {
c(EventStreamUpdated{})
}
}
// Queue overflow safe
jumpTracks = func(nRel int) {
// Kill the potential current stream
killStream()
if nRel > 0 && nRel > len(queue.Ahead) {
nRel = len(queue.Ahead)
if nRel == 0 {
nRel = 1
}
} else if nRel < 0 && -nRel > len(queue.Done) {
nRel = len(queue.Done)
if nRel == 0 {
nRel = -1
}
}
// We can imagine this algorithm like a tape where A B C D E are
// the items, B is currently playing and we want to skip 2 tracks
// ahead (D: queue.Done, P: queue.Playing, A: queue.Ahead):
// A [B] C D E
// D: A; P: B; A: C D E
if nRel > 0 {
// A B [] C D E
// D: A B, P: , A: C D E
if queue.Playing != nil {
queue.Done = append(queue.Done, *queue.Playing)
}
// A B C [] D E
// D: A B C, P: , A: D E
queue.Done = append(queue.Done, queue.Ahead[:nRel-1]...)
queue.Ahead = queue.Ahead[nRel-1:]
// A B C [D] E
// D: A B C, P: D, A: E
if len(queue.Ahead) > 0 {
queue.Playing = new(extractor.Data)
*queue.Playing = queue.Ahead[0]
queue.Ahead = queue.Ahead[1:]
} else {
queue.Playing = nil
}
queue.ShuffleOffset -= nRel
} else if nRel < 0 {
// The same thing in reverse
nRel *= -1
if queue.Playing != nil {
queue.Ahead = append([]extractor.Data{*queue.Playing}, queue.Ahead...)
}
ql := len(queue.Done)
queue.Ahead = append(queue.Done[ql-(nRel-1):ql], queue.Ahead...)
queue.Done = queue.Done[:ql-(nRel-1)]
if len(queue.Done) > 0 {
ql := len(queue.Done)
queue.Playing = new(extractor.Data)
*queue.Playing = queue.Done[ql-1]
queue.Done = queue.Done[:ql-1]
} else {
queue.Playing = nil
}
queue.ShuffleOffset += nRel
}
// Update stream
refreshStream(0, playbackSpeed)
}
var unshuffle func()
shuffle := func() {
if queue.AheadUnshuffled != nil {
unshuffle()
}
queue.AheadUnshuffled = append([]extractor.Data{}, queue.Ahead...)
rand.Shuffle(len(queue.Ahead), func(i, j int) {
queue.Ahead[i], queue.Ahead[j] = queue.Ahead[j], queue.Ahead[i]
})
queue.ShuffleOffset = 0
}
unshuffle = func() {
if queue.AheadUnshuffled == nil {
return
}
if queue.ShuffleOffset <= 0 {
if -queue.ShuffleOffset <= len(queue.AheadUnshuffled) {
queue.AheadUnshuffled = queue.AheadUnshuffled[-queue.ShuffleOffset:]
}
queue.ShuffleOffset = 0
}
queue.Ahead = append(queue.Ahead[:queue.ShuffleOffset], queue.AheadUnshuffled...)
queue.AheadUnshuffled = nil
}
// Main IO loop
for {
select {
case frame, ok := <-readAudioCh():
if ok {
outCh <- frame
nFrames++
} else {
// Audio channel was closed -> stream is finished -> reset all stream channels
audioch = nil
errch = nil
killch = nil
if filePlaybackDoneCh != nil {
filePlaybackDoneCh <- struct{}{}
}
filePlaybackDoneCh = nil
fmt.Println("Audio channel closed, going to next track")
if queue.Loop {
refreshStream(0, playbackSpeed)
} else {
jumpTracks(1)
}
}
case err, ok := <-errch:
if ok {
// Propagate error
cErrCh <- err
// Stream has closed with error -> reset all of its channels
audioch = nil
errch = nil
killch = nil
// Try to resurrect stream (if it fails again in the
// next 5 seconds, we'll skip the track instead)
now := time.Now()
if lastStreamErr.Sub(now) > 5*time.Second {
refreshStream(getPlaybackTime(), playbackSpeed)
} else {
jumpTracks(1)
cErrCh <- errors.New("skipping stream due to multiple errors")
}
lastStreamErr = now
} else {
// Stream is done without err, but not fully read yet -> block
// all future errch reads
// Also, killch is now unnecessary
errch = nil
killch = nil
}
case cmd, ok := <-cCmdCh:
if !ok {
// cCmdCh was closed by the user -> client is told to shut down
fmt.Println("Command channel closed, killing client")
killStream()
for _, c := range callbacksKilled {
c(EventKilled{})
}
return
} else {
switch v := cmd.(type) {
case CmdPlay:
queue.Paused = false
if audioch == nil {
jumpTracks(1)
}
case CmdPause:
queue.Paused = true
case CmdLoop:
queue.Loop = bool(v)
case CmdJump:
jumpTracks(int(v))
case CmdSkipAll:
killStream()
if queue.Playing != nil {
queue.Done = append(queue.Done, *queue.Playing)
queue.Playing = nil
}
queue.Done = append(queue.Done, queue.Ahead...)
queue.Ahead = nil
case CmdShuffle:
shuffle()
case CmdUnshuffle:
unshuffle()
case CmdSwap:
queue.AheadUnshuffled = nil
sw := struct{ A, B int }(v)
if queue.InBounds(sw.A) && queue.InBounds(sw.B) {
replacePlaying := sw.A == 0 || sw.B == 0
if replacePlaying {
killStream()
}
*queue.At(sw.A), *queue.At(sw.B) = *queue.At(sw.B), *queue.At(sw.A)
if replacePlaying {
refreshStream(0, playbackSpeed)
}
}
case CmdDelete:
queue.AheadUnshuffled = nil
idxs := []int(v)
// Sort indices descendingly by absolute value so we don't
// mess the future indices up in the process of removal
sort.Slice(idxs, func(i, j int) bool {
abs := func(i int) int {
if i < 0 {
return -i
}
return i
}
return idxs[abs(j)] < idxs[abs(i)]
})
for _, i := range idxs {
if i < 0 {
i = len(queue.Done) + i
if i < len(queue.Done) {
queue.Done = append(queue.Done[:i], queue.Done[i+1:]...)
}
} else if i == 0 {
killStream()
queue.Playing = nil
refreshStream(0, playbackSpeed)
} else {
i -= 1
if i < len(queue.Ahead) {
queue.Ahead = append(queue.Ahead[:i], queue.Ahead[i+1:]...)
}
}
}
case CmdAddFront:
queue.Ahead = append([]extractor.Data(v), queue.Ahead...)
queue.ShuffleOffset++
case CmdAddBack:
queue.Ahead = append(queue.Ahead, []extractor.Data(v)...)
case CmdSeek:
if float64(v) > getPlaybackTime() && float64(v) < getMaxCachedPlaybackTime() {
fmt.Println("Quick seeking to", v)
// Seek to location in buffer
for getPlaybackTime() < float64(v) {
_, ok := <-audioch
if !ok {
break
}
nFrames++
}
} else {
fmt.Println("Slow seeking to", v)
// Restart stream from other location (seek using ffmpeg)
refreshStream(float64(v), playbackSpeed)
}
case CmdSpeed:
refreshStream(getPlaybackTime(), float64(v))
case CmdPlayFileAndStop:
cmd := struct {
DoneCh chan<- struct{}
Data []byte
}(v)
audioch, errch, killch = audio.StreamToDiscordOpus(ffmpegPath, "pipe:", bytes.NewReader(cmd.Data), 0, 1.0, false)
// Reset stream info
nFrames = 0
tStart = 0
playbackSpeed = 1.0
queue.Paused = false
queue.Loop = false
filePlaybackDoneCh = cmd.DoneCh
case CmdGetTime:
v <- getPlaybackTime()
case CmdGetQueue:
v <- queue.Copy()
case CmdGetSpeed:
v <- playbackSpeed
}
}
}
}
}()
return Client{CmdCh: cCmdCh, ErrCh: cErrCh}
}

57
util/strings.go Normal file
View File

@ -0,0 +1,57 @@
package util
import (
"strings"
)
func CapitalizeFirst(s string) string {
if len(s) == 0 {
return s
}
return strings.ToUpper(s[:1]) + s[1:]
}
// A StringTabulator aligns columns similarly to the tabulator
// character (but 100% rigorously).
type StringTabulator [][]string
func (t *StringTabulator) WriteRow(cols ...string) {
*t = append(*t, cols)
}
func (t *StringTabulator) String() string {
if t == nil {
return ""
}
// Find which row has the most columns.
longestRow := 0
for _, row := range *t {
if len(row) > longestRow {
longestRow = len(row)
}
}
// For each column, find the field with the longest string.
longestField := make([]int, longestRow)
for _, row := range *t {
for i, col := range row {
if len(col) > longestField[i] {
longestField[i] = len(col)
}
}
}
// Add each line tabulated.
var res strings.Builder
for _, row := range *t {
for i, col := range row {
res.WriteString(col)
res.WriteString(strings.Repeat(" ", longestField[i]-len(col)))
}
res.WriteString("\n")
}
// Return the result.
return res.String()
}

41
util/time.go Normal file
View File

@ -0,0 +1,41 @@
package util
import (
"errors"
"fmt"
"strconv"
"strings"
)
// Convert a duration specifier to seconds (e.g. 64 (seconds), 1:04, 0:1:04 etc.)
func ParseDurationSeconds(s string) (int, error) {
var secs int
sp := strings.Split(s, ":")
if len(sp) < 1 || len(sp) > 3 {
return 0, errors.New("invalid duration format")
}
magnitude := 1
for i := len(sp) - 1; i >= 0; i-- {
n, err := strconv.Atoi(sp[i])
if n < 0 || err != nil {
return 0, errors.New("invalid duration")
}
secs += n * magnitude
magnitude *= 60
}
return secs, nil
}
func FormatDurationSeconds(s int) string {
var h, m int
h = s / 3600
s -= h * 3600
m = s / 60
s -= m * 60
var hs string
if h > 0 {
hs = fmt.Sprintf("%02d:", h)
}
return fmt.Sprintf("%s%02d:%02d", hs, m, s)
}