Squahsed history

This commit is contained in:
Ravi Khadiwala 2023-05-18 18:18:31 -05:00
commit 4a41801f5c
22 changed files with 10452 additions and 0 deletions

34
.eslintrc.json Normal file
View File

@ -0,0 +1,34 @@
{
"env": {
"browser": true,
"es2021": true
},
"extends": [
"eslint:recommended",
"plugin:@typescript-eslint/recommended"
],
"overrides": [
],
"parser": "@typescript-eslint/parser",
"parserOptions": {
"ecmaVersion": "latest",
"sourceType": "module"
},
"plugins": [
"@typescript-eslint"
],
"rules": {
"semi": [2, "always"],
"quotes": ["error", "single"],
"no-unused-vars": "off",
"prefer-const": ["error", {"destructuring": "all"}],
"@typescript-eslint/no-unused-vars": [
"warn",
{
"argsIgnorePattern": "^_",
"varsIgnorePattern": "^_",
"caughtErrorsIgnorePattern": "^_"
}
]
}
}

23
.github/workflows/ci.yml vendored Normal file
View File

@ -0,0 +1,23 @@
name: CI
on:
push:
branches: [ ravi/initial-commit ]
pull_request:
branches: [ ravi/initial-commit ]
jobs:
build:
runs-on: ubuntu-latest
env:
NODE_OPTIONS: --experimental-vm-modules
steps:
- uses: actions/checkout@v3
- name: Use Node.js version
uses: actions/setup-node@v3
with:
node-version: 18.16.1
cache: 'npm'
- run: npm ci
- run: npm run build
- run: npm test

175
.gitignore vendored Normal file
View File

@ -0,0 +1,175 @@
# Logs
logs
_.log
npm-debug.log_
yarn-debug.log*
yarn-error.log*
lerna-debug.log*
.pnpm-debug.log*
# Diagnostic reports (https://nodejs.org/api/report.html)
report.[0-9]_.[0-9]_.[0-9]_.[0-9]_.json
# Runtime data
pids
_.pid
_.seed
\*.pid.lock
# Directory for instrumented libs generated by jscoverage/JSCover
lib-cov
# Coverage directory used by tools like istanbul
coverage
\*.lcov
# nyc test coverage
.nyc_output
# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
.grunt
# Bower dependency directory (https://bower.io/)
bower_components
# node-waf configuration
.lock-wscript
# Compiled binary addons (https://nodejs.org/api/addons.html)
build/Release
# Dependency directories
node_modules/
jspm_packages/
# Snowpack dependency directory (https://snowpack.dev/)
web_modules/
# TypeScript cache
\*.tsbuildinfo
# Optional npm cache directory
.npm
# Optional eslint cache
.eslintcache
# Optional stylelint cache
.stylelintcache
# Microbundle cache
.rpt2_cache/
.rts2_cache_cjs/
.rts2_cache_es/
.rts2_cache_umd/
# Optional REPL history
.node_repl_history
# Output of 'npm pack'
\*.tgz
# Yarn Integrity file
.yarn-integrity
# dotenv environment variable files
.env
.env.development.local
.env.test.local
.env.production.local
.env.local
# parcel-bundler cache (https://parceljs.org/)
.cache
.parcel-cache
# Next.js build output
.next
out
# Nuxt.js build / generate output
.nuxt
dist
# Gatsby files
.cache/
# Comment in the public line in if your project uses Gatsby and not Next.js
# https://nextjs.org/blog/next-9-1#public-directory-support
# public
# vuepress build output
.vuepress/dist
# vuepress v2.x temp and cache directory
.temp
.cache
# Docusaurus cache and generated files
.docusaurus
# Serverless directories
.serverless/
# FuseBox cache
.fusebox/
# DynamoDB Local files
.dynamodb/
# TernJS port file
.tern-port
# Stores VSCode versions used for testing VSCode extensions
.vscode-test
# yarn v2
.yarn/cache
.yarn/unplugged
.yarn/build-state.yml
.yarn/install-state.gz
.pnp.\*
# wrangler project
.dev.vars
.wrangler/
.idea
.vscode/*

1
.nvmrc Normal file
View File

@ -0,0 +1 @@
18.16.1

619
LICENSE Normal file
View File

@ -0,0 +1,619 @@
GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 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 Affero General Public License is a free, copyleft license for
software and other kinds of works, specifically designed to ensure
cooperation with the community in the case of network server software.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
our General Public Licenses are 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.
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.
Developers that use our General Public Licenses protect your rights
with two steps: (1) assert copyright on the software, and (2) offer
you this License which gives you legal permission to copy, distribute
and/or modify the software.
A secondary benefit of defending all users' freedom is that
improvements made in alternate versions of the program, if they
receive widespread use, become available for other developers to
incorporate. Many developers of free software are heartened and
encouraged by the resulting cooperation. However, in the case of
software used on network servers, this result may fail to come about.
The GNU General Public License permits making a modified version and
letting the public access it on a server without ever releasing its
source code to the public.
The GNU Affero General Public License is designed specifically to
ensure that, in such cases, the modified source code becomes available
to the community. It requires the operator of a network server to
provide the source code of the modified version running there to the
users of that server. Therefore, public use of a modified version, on
a publicly accessible server, gives the public access to the source
code of the modified version.
An older license, called the Affero General Public License and
published by Affero, was designed to accomplish similar goals. This is
a different license, not a version of the Affero GPL, but Affero has
released a new version of the Affero GPL which permits relicensing under
this license.
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 Affero 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. Remote Network Interaction; Use with the GNU General Public License.
Notwithstanding any other provision of this License, if you modify the
Program, your modified version must prominently offer all users
interacting with it remotely through a computer network (if your version
supports such interaction) an opportunity to receive the Corresponding
Source of your version by providing access to the Corresponding Source
from a network server at no charge, through some standard or customary
means of facilitating copying of software. This Corresponding Source
shall include the Corresponding Source for any work covered by version 3
of the GNU General Public License that is incorporated pursuant to the
following paragraph.
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 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 work with which it is combined will remain governed by version
3 of the GNU General Public License.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU Affero 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 Affero 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 Affero 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 Affero 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

51
README.md Normal file
View File

@ -0,0 +1,51 @@
# Overview
tus-server provides an implementation of the [TUS protocol](https://tus.io) for resumable uploads built on [cloudflare workers](https://www.cloudflare.com/products/workers/) and [R2](https://www.cloudflare.com/products/r2/).
# Building
You'll need [Node.js](https://nodejs.org/). If you use [nvm](https://github.com/creationix/nvm) run
```
nvm use
```
To install dependencies,
```
npm install
```
In order to deploy to cloudflare or use non-local dev mode, use the [`wrangler`](https://developers.cloudflare.com/workers/wrangler/install-and-update/) utility. Follow those instructions to authenticate with your cloudflare account.
# Testing
The server assumes an authentication is provided via a signature using a shared secret. You can provide one for development by setting `SHARED_AUTH_SECRET` in `.dev.vars`, e.g.
```
> cat .dev.vars
SHARED_AUTH_SECRET = "test"
```
To run a dev server you can interact with over localhost
```
wrangler dev
```
To run unit tests,
```
NODE_OPTIONS=--experimental-vm-modules npm test
```
# Deploying
## One time setup
1. Create an R2 bucket and update the binding in `wrangler.toml`
2. Add a base64 encoded shared auth secret with `wrangler secret put SHARED_AUTH_SECRET`
```
wrangler deploy -e <staging|production>
```
# License
Copyright 2023 Signal Messenger, LLC
Licensed under the [AGPLv3](LICENSE)

7553
package-lock.json generated Normal file

File diff suppressed because it is too large Load Diff

28
package.json Normal file
View File

@ -0,0 +1,28 @@
{
"name": "attachments",
"version": "0.0.0",
"type": "module",
"module": "./dist/index.js",
"devDependencies": {
"@cloudflare/workers-types": "^4.20230419.0",
"@typescript-eslint/eslint-plugin": "^5.59.6",
"@typescript-eslint/parser": "^5.59.6",
"eslint": "^8.40.0",
"tus-js-client": "^3.1.0",
"typescript": "^5.0.4",
"vitest": "^0.31.1",
"vitest-environment-miniflare": "^2.14.0",
"wrangler": "^2.20.0"
},
"private": true,
"scripts": {
"start": "wrangler dev",
"deploy": "wrangler publish",
"build": "wrangler build",
"pretest": "wrangler build",
"test": "vitest"
},
"dependencies": {
"itty-router": "^4.0.9"
}
}

33
src/auth.test.ts Normal file
View File

@ -0,0 +1,33 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {describe, expect, it} from 'vitest';
import {createAuthWithClock} from './auth';
describe('Auth', async () => {
const user = 'test';
const secret = 'secret';
const maxAge = 10;
async function generatePassAt(user: string, time: number): Promise<string> {
const auth = await createAuthWithClock(secret, maxAge, () => time);
return await auth.generatePass(user);
}
async function validateAt(user: string, password: string, time: number): Promise<boolean> {
const auth = await createAuthWithClock(secret, maxAge, () => time);
return await auth.validateCredentials(user, password);
}
it('rejects expired credentials', async () => {
expect(await validateAt(user, await generatePassAt(user, 1), 12)).toBe(false);
});
it('passes valid credentials', async () => {
expect(await validateAt(user, await generatePassAt(user, 1), 11)).toBe(true);
});
it('rejects wrong-user credentials', async () => {
expect(await validateAt(user, await generatePassAt(user + 'a', 1), 1)).toBe(false);
});
});

53
src/auth.ts Normal file
View File

@ -0,0 +1,53 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {Buffer} from 'node:buffer';
export interface Auth {
generatePass(username: string): Promise<string>;
validateCredentials(username: string, password: string): Promise<boolean>;
}
interface UnixTime {
(): number;
}
export async function createAuthWithClock(secret: string, maxAgeSeconds: number, clock: UnixTime): Promise<Auth> {
const keyBytes = Buffer.from(secret, 'base64');
const macKey = await crypto.subtle.importKey(
'raw',
keyBytes,
{name: 'HMAC', hash: 'SHA-256'},
false,
['sign', 'verify']
);
return {
async generatePass(username: string): Promise<string> {
const now = clock().toString();
const data = Buffer.from(username + ':' + now, 'utf-8');
const sig = (await crypto.subtle.sign('HMAC', macKey, data)).slice(0, 10);
return `${now}:${Buffer.from(sig).toString('hex')}`;
},
async validateCredentials(username: string, password: string): Promise<boolean> {
const [ts, sig] = password.split(':');
const data = Buffer.from(username + ':' + ts, 'utf-8');
const expected = (await crypto.subtle.sign('HMAC', macKey, data)).slice(0, 10);
const actual = Buffer.from(sig, 'hex');
if (!crypto.subtle.timingSafeEqual(actual, expected)) {
return false;
}
const now = clock();
const tsSecs = parseInt(ts);
return tsSecs + maxAgeSeconds >= now;
}
};
}
export async function createAuth(secret: string, maxAgeSeconds: number): Promise<Auth> {
return await createAuthWithClock(secret, maxAgeSeconds, () => Math.floor(new Date().getTime() / 1000));
}

33
src/digest.ts Normal file
View File

@ -0,0 +1,33 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
export interface Digester {
update(bytes: ArrayBuffer | ArrayBufferView): Promise<void>;
digest(): Promise<ArrayBuffer | undefined>;
}
export function noopDigester(): Digester {
return {
async update(_bytes: Uint8Array): Promise<void> {
return Promise.resolve();
},
async digest(): Promise<Uint8Array | undefined> {
return undefined;
}
};
}
export function sha256Digester(): Digester {
const stream = new crypto.DigestStream('SHA-256');
const writer = stream.getWriter();
return {
async update(bytes: ArrayBuffer | ArrayBufferView): Promise<void> {
return await writer.write(bytes);
},
async digest(): Promise<ArrayBuffer | undefined> {
await writer.close();
return await stream.digest;
}
};
}

466
src/index.test.ts Normal file
View File

@ -0,0 +1,466 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {expect, it, beforeAll, afterAll, describe, test} from 'vitest';
import {createAuth} from './auth';
import * as tus from 'tus-js-client';
import {unstable_dev, UnstableDevWorker} from 'wrangler';
import {X_SIGNAL_CHECKSUM_SHA256} from './uploadHandler';
import {toBase64} from './util';
const prefix = 'bucket';
const secret = 'test';
const auth = await createAuth(secret, 100);
const PART_SIZE = 1024 * 1024 * 5;
let worker: UnstableDevWorker;
beforeAll(async () => {
worker = await unstable_dev('src/index.ts', {
experimental: {disableExperimentalWarning: true},
vars: {
SHARED_AUTH_SECRET: secret,
PATH_PREFIX: prefix
}
});
});
afterAll(async () => {
await worker.stop();
});
describe('worker auth', () => {
it('rejects un-authd request', async () => {
const res = await worker.fetch(`http://localhost/upload/${prefix}/`, {
method: 'POST',
headers: {'Upload-Metadata': `filename ${btoa('test')}`}
});
expect(res.status).toBe(401);
});
it('rejects misformated auth', async () => {
const res = await worker.fetch(`http://localhost/upload/${prefix}/`, {
method: 'POST',
headers: {'Authorization': 'Complex zzzzz'}
});
expect(res.status).toBe(400);
});
it('accepts valid auth', async () => {
const res = await worker.fetch(`http://localhost/upload/${prefix}/`, {
method: 'POST',
headers: {
'Upload-Metadata': `filename ${btoa('abc')}`,
'Authorization': await headerFor('abc'),
'Upload-Length': '1'
}
});
expect(await res.text()).toBe('');
expect(res.status).toBe(201);
});
});
describe('request validation', () => {
it('rejects bad checksum', async () => {
const res = await worker.fetch(`http://localhost/upload/${prefix}/`, {
method: 'POST',
headers: {
'Upload-Metadata': `filename ${btoa('abc')}`,
'Authorization': await headerFor('abc'),
'Upload-Length': '1',
[X_SIGNAL_CHECKSUM_SHA256]: 'AAAA'
}
});
expect(res.status).toBe(400);
});
it('rejects no upload-length', async () => {
const res = await worker.fetch(`http://localhost/upload/${prefix}/`, {
method: 'POST',
headers: {
'Upload-Metadata': `filename ${btoa('abc')}`,
'Authorization': await headerFor('abc'),
}
});
expect(res.status).toBe(400);
});
});
describe('Tus', () => {
const name = 'test123';
interface CreateOptions {
uploadLength?: number;
body?: string;
checksum?: Uint8Array;
}
async function createRequest(opts?: CreateOptions) {
const headers: Record<string, string> = {
'Authorization': await headerFor(name),
'Tus-Resumable': '1.0.0',
'Upload-Metadata': `filename ${btoa(name)}`
};
if (opts?.uploadLength != null) {
headers['Upload-Length'] = opts.uploadLength.toString();
} else {
headers['Upload-Defer-Length'] = '1';
}
if (opts?.checksum != null) {
headers[X_SIGNAL_CHECKSUM_SHA256] = toBase64(opts?.checksum);
}
if (opts?.body != null) {
headers['Content-Type'] = 'application/offset+octet-stream';
}
return await worker.fetch(`http://localhost/upload/${prefix}/`, {
method: 'POST',
headers: headers,
body: opts?.body
});
}
async function patchRequest(uploadOffset: number, body?: string | ReadableStream<Uint8Array>, headers?: Record<string, string>) {
const h = headers || {};
Object.assign(h, {
'Authorization': await headerFor(name),
'Upload-Offset': uploadOffset.toString(),
'Content-Type': 'application/offset+octet-stream',
'Tus-Resumable': '1.0.0'
});
return await worker.fetch(`http://localhost/upload/${prefix}/${name}`, {
method: 'PATCH',
headers: h,
duplex: 'half',
body: body
});
}
async function headRequest() {
return worker.fetch(`http://localhost/upload/${prefix}/${name}`, {
method: 'HEAD',
headers: {
'Authorization': await headerFor(name),
'Tus-Resumable': '1.0.0'
}
});
}
async function getRequest() {
return await worker.fetch(`http://localhost/${prefix}/${name}`, {
method: 'GET',
headers: {
'Authorization': await headerFor(name),
}
});
}
it('accepts an upload', async () => {
const create = await createRequest({uploadLength: 4});
expect(await create.text()).toBe('');
expect(create.status).toBe(201);
const upload = await patchRequest(0, 'test');
expect(await upload.text()).toBe('');
expect(upload.status).toBe(204);
expect(upload.headers.get('Upload-Offset')).toBe('4');
});
it('can defer length', async () => {
const create = await createRequest();
expect(await create.text()).toBe('');
expect(create.status).toBe(201);
const upload1 = await patchRequest(0, 'test');
expect(upload1.status).toBe(204);
const upload2 = await patchRequest(4, 'test');
expect(upload2.status).toBe(204);
const upload3 = await patchRequest(8, 'test', {'Upload-Length': '12'});
expect(upload3.status).toBe(204);
const get = await getRequest();
expect(await get.text()).toBe('testtesttest');
expect(get.status).toBe(200);
});
it('can defer length and finish with an empty body', async () => {
const create = await createRequest();
expect(await create.text()).toBe('');
expect(create.status).toBe(201);
const upload1 = await patchRequest(0, 'test');
expect(upload1.status).toBe(204);
expect(upload1.headers.get('Upload-Offset')).toBe('4');
const upload2 = await patchRequest(4, '', {'Upload-Length': '4'});
expect(upload2.status).toBe(204);
expect(upload2.headers.get('Upload-Offset')).toBe('4');
const get = await getRequest();
expect(await get.text()).toBe('test');
expect(get.status).toBe(200);
});
it('can upload in chunks', async () => {
const create = await createRequest({uploadLength: 8});
expect(create.status).toBe(201);
let upload = await patchRequest(0, 'test');
expect(upload.status).toBe(204);
expect(upload.headers.get('Upload-Offset')).toBe('4');
const head = await headRequest();
expect(head.status).toBe(200);
expect(head.headers.get('Upload-Offset')).toBe('4');
upload = await patchRequest(4, 'test');
expect(upload.statusText).toBe('No Content');
expect(upload.status).toBe(204);
const get = await getRequest();
expect(await get.text()).toBe('testtest');
expect(get.status).toBe(200);
});
it('can resume after interruption', async () => {
const create = await createRequest({uploadLength: 16});
expect(create.status).toBe(201);
// body errors after first 8 bytes
await expect(() => patchRequest(0, body(8, {
pattern: 'test',
error: 'injected error',
// write small chunks so the reader reads something before the error
targetChunkSize: 4
}))).rejects.toThrowError();
const head = await headRequest();
expect(head.status).toBe(200);
expect(head.headers.get('Upload-Offset')).toBe('8');
// upload the rest
const upload = await patchRequest(8, 'testtest');
expect(upload.status).toBe(204);
const get = await getRequest();
expect(await get.text()).toBe('testtesttesttest');
});
it('can do a partial upload during creation', async () => {
const create = await createRequest({uploadLength: 6, body: 'foo'});
expect(create.status).toBe(201);
expect(create.headers.get('Upload-Offset')).toBe('3');
expect((await headRequest()).headers.get('Upload-Offset')).toBe('3');
const upload = await patchRequest(3, 'bar');
expect(upload.status).toBe(204);
const get = await getRequest();
expect(await get.text()).toBe('foobar');
});
it('rejects bad upload-offset', async () => {
const create = await createRequest({uploadLength: 6, body: 'foo'});
expect(create.status).toBe(201);
expect(create.headers.get('Upload-Offset')).toBe('3');
const upload = await patchRequest(4, 'ba');
expect(upload.status).toBe(409);
await patchRequest(3, 'bar');
expect(await (await getRequest()).text()).toBe('foobar');
});
test.each(
[0, 1, PART_SIZE - 1, PART_SIZE, PART_SIZE + 1]
)('rejects incorrect checksum for length=%s', async (bodySize: number) => {
await createRequest({uploadLength: bodySize, checksum: new Uint8Array(32)});
const upload = await patchRequest(0, body(bodySize, {pattern: 'test'}));
expect(upload.status).toBe(415);
// should delete the in-progress upload
expect((await headRequest()).status).toBe(404);
});
test.each(
[
[100, false],
[100, true],
[PART_SIZE + 1, false],
[PART_SIZE + 1, true]
]
)('accepts correct checksum for length=%s, multiple-patches=%s)',
async (bodySize: number, multiplePatches: boolean) => {
const digestStream = new crypto.DigestStream('SHA-256');
await body(bodySize, {pattern: 'test'}).pipeTo(digestStream);
const expectedChecksum = await digestStream.digest;
await createRequest({uploadLength: bodySize, checksum: new Uint8Array(expectedChecksum)});
if (multiplePatches) {
await patchRequest(0, body(4, {pattern: 'test'}));
await patchRequest(4, body(bodySize - 4, {pattern: 'test'}));
} else {
await patchRequest(0, body(bodySize, {pattern: 'test'}));
}
// make sure the checksum is also returned on GET
const get = await getRequest();
const actualChecksum = Buffer.from(get.headers.get(X_SIGNAL_CHECKSUM_SHA256) || '', 'base64');
expect(actualChecksum.buffer).toEqual(expectedChecksum);
});
// parameterized test of boundary conditions
test.each(
[0, 1, PART_SIZE - 1, PART_SIZE, PART_SIZE + 1, PART_SIZE * 10 + 1]
)('upload(%s bytes)',
async (uploadSize) => {
const create = await createRequest({uploadLength: uploadSize});
expect(create.status).toBe(201);
const upload = await patchRequest(0, body(uploadSize, {pattern: 'test'}));
expect(upload.status).toBe(204);
expect(upload.headers.get('Upload-Offset')).toBe(uploadSize.toString());
const get = await getRequest();
const read = await get.text();
expect(bodyMatchesPattern(read, 'test')).toBe(true);
const expectedEtag = await s3Etag(body(uploadSize, {pattern: 'test'}));
expect(get.headers.get('etag')).toBe(expectedEtag);
});
});
describe('tus-js-client', () => {
const name = 'test-client-obj';
test.each([false, true])('uploads creation-with-upload=%s',
async (uploadDataDuringCreation: boolean) => {
const blob = Buffer.from('test', 'utf-8');
const authHeader = await headerFor(name);
await new Promise<void>((resolve, reject) => {
// node tus.Upload takes Buffer but typescript bindings are wrong
const upload = new tus.Upload(blob as never as Blob, {
endpoint: `http://${worker.address}:${worker.port}/upload/${prefix}/`,
metadata: {'filename': name},
headers: {'Authorization': authHeader},
onError: reject,
onSuccess: resolve,
uploadSize: 4,
uploadDataDuringCreation: uploadDataDuringCreation
});
upload.start();
});
const resp = await fetch(`http://${worker.address}:${worker.port}/${prefix}/${name}`);
expect(await resp.text()).toBe('test');
}, {timeout: 10000});
});
async function headerFor(key: string): Promise<string> {
const user = `${prefix}/${key}`;
const pass = await auth.generatePass(user);
return `Basic ${Buffer.from(`${user}:${pass}`).toString('base64')}`;
}
function fillPattern(targetSize: number, pattern: string): Uint8Array {
const patternBytes = new TextEncoder().encode(pattern);
if (patternBytes.byteLength >= targetSize) {
return patternBytes;
}
const repeatCount = Math.floor(targetSize / pattern.length);
const chunk = new Uint8Array(repeatCount * patternBytes.byteLength);
for (let i = 0; i < repeatCount; i++) {
chunk.set(patternBytes, i * patternBytes.byteLength);
}
return chunk;
}
function bodyMatchesPattern(body: string, pattern: string): boolean {
for (let offset = 0; offset < body.length; offset += pattern.length) {
const remaining = body.length - offset;
if (body.slice(offset, offset + pattern.length) !== pattern.slice(0, remaining)) {
return false;
}
}
return true;
}
interface BodyOptions {
error?: string,
pattern?: string,
targetChunkSize?: number
}
function body(numBytes: number, bodyOptions?: BodyOptions): ReadableStream<Uint8Array> {
const chunkSize = bodyOptions?.targetChunkSize || 4096;
const chunk = bodyOptions?.pattern == null
? new Uint8Array(chunkSize)
: fillPattern(chunkSize, bodyOptions.pattern);
const queueChunk = (controller: ReadableStreamDefaultController) => {
if (numBytes >= chunk.length) {
numBytes -= chunk.length;
controller.enqueue(chunk);
return;
}
if (numBytes > 0) {
controller.enqueue(chunk.subarray(0, numBytes));
}
if (bodyOptions?.error != null) {
controller.error(bodyOptions?.error);
} else {
controller.close();
}
};
return new ReadableStream({
start(controller) {
queueChunk(controller);
},
pull(controller) {
queueChunk(controller);
}
});
}
// This implements the undocumented but de-facto standard algorithm S3 (and R2) uses
// to compute etags. If the object was uploaded without multi-part upload, it is
// the hex md5 of the object's bytes. If it was uploaded with multi-part, it is
// hex(md5(md5(part 1), md5(part 2) ...))-numParts
async function s3Etag(body: ReadableStream<Uint8Array>): Promise<string> {
const md5sums: ArrayBuffer[] = [];
const mem = new Uint8Array(PART_SIZE);
let offset = 0;
for await (let chunk of body) {
while (chunk.byteLength > 0) {
const toCopy = Math.min(PART_SIZE - offset, chunk.byteLength);
mem.set(chunk.subarray(0, toCopy), offset);
offset += toCopy;
chunk = chunk.subarray(toCopy, chunk.byteLength);
if (offset === PART_SIZE && chunk.byteLength > 0) {
md5sums.push(await crypto.subtle.digest('MD5', mem));
offset = 0;
}
}
}
md5sums.push(await crypto.subtle.digest('md5', mem.subarray(0, offset)));
if (md5sums.length == 1) {
return `"${Buffer.from(md5sums[0]).toString('hex')}"`;
}
const nestedMd5 = await crypto.subtle.digest('MD5', await new Blob(md5sums).arrayBuffer());
return `"${Buffer.from(nestedMd5).toString('hex')}-${md5sums.length}"`;
}

190
src/index.ts Normal file
View File

@ -0,0 +1,190 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {error, IRequest, json, Router} from 'itty-router';
import {Auth, createAuth} from './auth';
import {Buffer} from 'node:buffer';
import {MAX_UPLOAD_LENGTH_BYTES, TUS_VERSION, X_SIGNAL_CHECKSUM_SHA256} from './uploadHandler';
import {toBase64} from './util';
import {parseUploadMetadata} from './parse';
export {UploadHandler} from './uploadHandler';
const DO_CALL_TIMEOUT = 1000 * 60 * 30; // 20 minutes
export interface Env {
BUCKET: R2Bucket;
SHARED_AUTH_SECRET: string;
UPLOAD_HANDLER: DurableObjectNamespace;
PATH_PREFIX: string;
}
// lazy init because it requires env but is expensive to create
let auth: Auth | undefined;
const router = Router();
router
// read the object :id directly from R2
.get('/:bucket/:id', getHandler)
// TUS protocol operation, dispatched to an UploadHandler durable object
.post('/upload/:bucket', withAuthenticatedKeyFromMetadata, uploadHandler)
// TUS protocol operation, dispatched to an UploadHandler durable object
.patch('/upload/:bucket/:id', withAuthenticatedKey, uploadHandler)
// TUS protocol operation, dispatched to an UploadHandler durable object
.head('/upload/:bucket/:id', withAuthenticatedKey, uploadHandler)
// Describes what TUS features we support
.options('/upload/:bucket', optionsHandler)
.all('*', () => error(404));
export default {
async fetch(
request: Request,
env: Env,
_ctx: ExecutionContext
): Promise<Response> {
return await router.handle(request, env).catch(e => {
console.log('error: ' + e.stack);
return error(e);
}).then(json);
}
};
async function getHandler(request: IRequest, env: Env): Promise<Response> {
const requestId = request.params.id;
if (request.params.bucket !== env.PATH_PREFIX) {
return error(404);
}
const object = await env.BUCKET.get(requestId);
if (object === null) {
return error(404);
}
const headers = new Headers();
object.writeHttpMetadata(headers);
headers.set('etag', object.httpEtag);
// the sha256 checksum was provided to R2 in the upload
if (object.checksums.sha256 != null) {
headers.set(X_SIGNAL_CHECKSUM_SHA256, toBase64(object.checksums.sha256));
}
// it was a multipart upload so we were forced to write a sha256 checksum as a custom header
if (object.customMetadata?.[X_SIGNAL_CHECKSUM_SHA256] != null) {
headers.set(X_SIGNAL_CHECKSUM_SHA256, object.customMetadata[X_SIGNAL_CHECKSUM_SHA256]);
}
return new Response(object.body, {headers});
}
async function optionsHandler(_request: IRequest, _env: Env): Promise<Response> {
return new Response(null, {
status: 204,
headers: new Headers({
'Tus-Resumable': TUS_VERSION,
'Tus-Version': TUS_VERSION,
'Tus-Max-Size': MAX_UPLOAD_LENGTH_BYTES.toString(),
'Tus-Extension': 'creation,creation-defer-length,creation-with-upload,expiration'
})
});
}
// TUS protocol requests (POST/PATCH/HEAD) that get forwarded to a durable object
async function uploadHandler(request: IRequest, env: Env): Promise<Response> {
const requestId: string = request.key;
// The id of the DurableObject is derived from the authenticated upload id provided by the requester
const handler = env.UPLOAD_HANDLER.get(env.UPLOAD_HANDLER.idFromName(requestId));
return await handler.fetch(request.url, {
body: request.body,
method: request.method,
headers: request.headers,
signal: AbortSignal.timeout(DO_CALL_TIMEOUT)
});
}
interface ParseError {
state: 'error',
error: Response
}
interface Credentials {
state: 'success',
user: string,
password: string
}
function parseBasicAuth(auth: string): Credentials | ParseError {
const prefix = 'Basic ';
if (!auth.startsWith(prefix)) {
return {state: 'error', error: error(400, 'auth should be Basic ')};
}
const cred = auth.slice(prefix.length);
const decoded = Buffer.from(cred, 'base64').toString('utf8');
const [username, ...rest] = decoded.split(':');
const password = rest.join(':');
if (!password) {
return {state: 'error', error: error(400, 'invalid auth format')};
}
return {state: 'success', user: username, password: password};
}
// Checks the request is authenticated for the name provided in the request path :id segment
async function withAuthenticatedKey(request: IRequest, env: Env): Promise<Response | undefined> {
return await authAgainstUploadName(request, env, request.params.bucket, request.params.id);
}
// Checks the request is authenticated for the name provided in the TUS upload-metadata
async function withAuthenticatedKeyFromMetadata(request: IRequest, env: Env): Promise<Response | undefined> {
const key = parseUploadMetadata(request.headers).filename;
if (key == null) {
return error(400, 'upload-metadata filename required');
}
return await authAgainstUploadName(request, env, request.params.bucket, key);
}
// Checks the request is authenticated for key
async function authAgainstUploadName(request: IRequest, env: Env, bucket: string, key: string): Promise<Response | undefined> {
auth = auth || await createAuth(env.SHARED_AUTH_SECRET, 3600 * 24 * 7);
if (bucket !== env.PATH_PREFIX) {
return error(404);
}
const authHeader = request.headers.get('Authorization');
if (!authHeader) {
return error(401, 'missing credentials');
}
const parsed = parseBasicAuth(authHeader);
if (parsed.state === 'error') {
return parsed.error;
}
const valid = await auth.validateCredentials(parsed.user, parsed.password);
if (!valid) {
return error(401, 'invalid credentials');
}
if (key === '') {
return error(400, 'invalid upload name');
}
if (parsed.user !== bucket + '/' + key) {
return error(401, 'invalid credentials for upload name');
}
request.key = key;
}

59
src/parse.test.ts Normal file
View File

@ -0,0 +1,59 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {describe, expect, it} from 'vitest';
import {parseUploadMetadata} from './parse';
import {StatusError} from 'itty-router';
describe('upload-metadata parsing', () => {
it('parses valid data', () => {
const checksum = new Uint8Array(32);
crypto.getRandomValues(checksum);
const uploadMetadata = parseUploadMetadata(new Headers({
'Upload-Metadata': createUploadMetadata({'filename': 'name'})
}));
expect(uploadMetadata.filename).toBe('name');
});
it('rejects empty key', () => {
expect(() => parseUploadMetadata(new Headers({
'Upload-Metadata': ',filename abc'
}))).toSatisfy(throwsStatusCode(400));
});
it('handles empty value', () => {
expect(parseUploadMetadata(new Headers({
'Upload-Metadata': `ignored,filename ${btoa('hello')}`
})).filename).toBe('hello');
});
it('ignores unknown fields', () => {
expect(parseUploadMetadata(new Headers({
'Upload-Metadata': `ignored hi,filename ${btoa('hello')}`
})).filename).toBe('hello');
});
function throwsStatusCode(statusCode: number): (value: (() => void)) => boolean {
return f => {
try {
f();
return false;
} catch (e) {
console.log(`expected error: ${e}`);
return e instanceof StatusError && e.status == statusCode;
}
};
}
});
function createUploadMetadata(metadata: Record<string, string | Uint8Array>): string {
return Object.entries(metadata)
.map(([key, value]) => {
if (typeof value === 'string') {
return `${key} ${btoa(value)}`;
} else {
return `${key} ${Buffer.from(value).toString('base64')}`;
}
})
.join(',');
}

59
src/parse.ts Normal file
View File

@ -0,0 +1,59 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {StatusError} from 'itty-router';
import {fromBase64} from './util';
import {X_SIGNAL_CHECKSUM_SHA256} from './uploadHandler';
export interface UploadMetadata {
filename?: string,
}
// Parse "Upload-Metadata" header as described in the TUS creation extension
// https://tus.io/protocols/resumable-upload#upload-metadata
export function parseUploadMetadata(headers: Headers): UploadMetadata {
const uploadMetadata: string | null = headers.get('Upload-Metadata');
if (uploadMetadata == null) {
return {};
}
const ret: UploadMetadata = {};
const pairs = uploadMetadata.split(',');
for (const pair of pairs) {
const [key, value] = pair.split(' ', 2);
if (key == null || key === '') {
throw new StatusError(400, 'upload-metadata entries must have keys');
}
if (value == null) {
// skip: leaving the value off is in spec, but none of the keys we care about allow it
continue;
}
const valueBytes: Uint8Array | undefined = fromBase64(value);
if (valueBytes == null) {
throw new StatusError(400, 'upload metadata must be base64 encoded');
}
if (key === 'filename') {
ret.filename = new TextDecoder().decode(valueBytes);
}
}
return ret;
}
export function parseChecksum(headers: Headers): Uint8Array | undefined {
const checksum = headers.get(X_SIGNAL_CHECKSUM_SHA256);
if (checksum == null) {
return;
}
const bytes = fromBase64(checksum);
if (bytes == null) {
throw new StatusError(400, 'checksum should be base64');
}
if (bytes.length !== 32) {
throw new StatusError(400, 'SHA-256 checksum should be 32 bytes');
}
return bytes;
}

170
src/uploadHandler.test.ts Normal file
View File

@ -0,0 +1,170 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {expect, it, test} from 'vitest';
import {UploadHandler} from './uploadHandler';
import {Env} from './index';
const describe = setupMiniflareIsolatedStorage();
const PART_SIZE = 1024 * 1024 * 5;
describe('uploadHandler', () => {
const env: Env = getMiniflareBindings() as Env;
const r2: R2Bucket = env.BUCKET;
it('cleans after alarms', async () => {
const id = env.UPLOAD_HANDLER.newUniqueId();
const stub = env.UPLOAD_HANDLER.get(id);
const resp = await stub.fetch('http://localhost/upload/bucket/', {
method: 'POST',
headers: {
'Upload-Metadata': `filename ${btoa('test123')}`,
'Upload-Length': '10'
}
});
const storage = await getMiniflareDurableObjectStorage(id);
expect(await storage.get('upload-info')).toMatchObject({uploadLength: 10});
expect(await storage.get('upload-offset')).toBe(0);
await flushMiniflareDurableObjectAlarms();
expect((await storage.list()).size).toBe(0);
});
it('cleans after unrecoverable failure', async () => {
const id = env.UPLOAD_HANDLER.idFromName('test123');
const stub = env.UPLOAD_HANDLER.get(id);
const storage = await getMiniflareDurableObjectStorage(id);
// invalid state: temp object should be length 5, is only length 1
const tempkey = `temporary/${id.toString()}`;
await r2.put(tempkey, '1');
await storage.put('upload-info', {uploadLength: 10});
await storage.put('upload-offset', 5);
await expect(() => stub.fetch('http://localhost/upload/bucket/test123', {
method: 'PATCH',
headers: {'Upload-Offset': '5'},
body: '6789!'
})).rejects.toThrowError();
// should clean up after unrecoverable error
expect((await storage.list()).size).toBe(0);
});
it('hydrates from cold storage', async () => {
const id = env.UPLOAD_HANDLER.idFromName('test123');
const stub = env.UPLOAD_HANDLER.get(id);
const storage = await getMiniflareDurableObjectStorage(id);
const tempkey = `temporary/${id.toString()}`;
await r2.put(tempkey, '12345');
await storage.put('upload-info', {uploadLength: 10});
await storage.put('upload-offset', 5);
const resp = await stub.fetch('http://localhost/upload/bucket/test123', {
method: 'PATCH',
headers: {'Upload-Offset': '5'},
body: '6789!'
});
expect(resp.status).toBe(204);
const obj = await r2.get('test123');
expect(obj).toBeTruthy();
expect(await obj?.text()).toBe('123456789!');
// temporary should be gone
expect(await r2.get(tempkey)).toBeNull();
// all keys should be gone after success
expect((await storage.list()).size).toBe(0);
});
it('hydrates tx parts from cold storage', async () => {
const id = env.UPLOAD_HANDLER.idFromName('test123');
const stub = env.UPLOAD_HANDLER.get(id);
const storage = await getMiniflareDurableObjectStorage(id);
const partBody = new Uint8Array(PART_SIZE);
const tempkey = `temporary/${id.toString()}`;
const mp = await r2.createMultipartUpload('test123');
const part1 = await mp.uploadPart(1, partBody);
await r2.put(tempkey, '12345');
await storage.put('upload-offset', partBody.length + 5);
await storage.put('upload-info', {
uploadLength: partBody.length + 10,
multipartUploadId: mp.uploadId
});
await storage.put('1', {
part: part1,
length: partBody.byteLength
});
const resp = await stub.fetch('http://localhost/upload/bucket/test123', {
method: 'PATCH',
headers: {'Upload-Offset': (partBody.byteLength + 5).toString()},
body: '6789!'
});
expect(resp.status).toBe(204);
const obj = await r2.get('test123');
expect(obj).toBeTruthy();
const read = await obj?.text();
expect(read?.length).toBe(partBody.byteLength + 10);
expect(read?.slice(partBody.length, partBody.length + 10)).toBe('123456789!');
// temporary should be gone
expect(await r2.get(tempkey)).toBeNull();
// all keys should be gone after success
expect((await storage.list()).size).toBe(0);
});
test.each(
[
[PART_SIZE, 1, 1],
[PART_SIZE + 1, PART_SIZE, 1],
[0, PART_SIZE + 1, 1],
[0, 10, 10],
[0, 10, PART_SIZE]
]
)('resumes from storage for chunks=[%s,%s,%s]', async (chunk1Size, chunk2Size, chunk3Size) => {
const id = env.UPLOAD_HANDLER.idFromName('test123');
const state = await getMiniflareDurableObjectState(id);
const firstChunk = new Uint8Array(chunk1Size);
const secondChunk = new Uint8Array(chunk2Size);
const thirdChunk = new Uint8Array(chunk3Size);
const totalLength = firstChunk.length + secondChunk.length + thirdChunk.length;
const oldObj = new UploadHandler(state, env);
await runWithMiniflareDurableObjectGates(state, () => oldObj.fetch(new Request('http://localhost/upload/bucket', {
method: 'POST',
headers: {
'Upload-Metadata': `filename ${btoa('test123')}`,
'Upload-Length': totalLength.toString(),
'Content-Type': 'application/offset+octet-stream'
},
body: firstChunk
})));
await runWithMiniflareDurableObjectGates(state, () => oldObj.fetch(new Request('http://localhost/upload/bucket/test123', {
method: 'PATCH',
headers: {'Upload-Offset': firstChunk.length.toString()},
body: secondChunk
})));
// create a new object from the same state
const newObj = new UploadHandler(state, env);
await runWithMiniflareDurableObjectGates(state, () =>
newObj.fetch(new Request('http://localhost/upload/bucket/test123', {
method: 'PATCH',
body: thirdChunk,
headers: {'Upload-Offset': (firstChunk.length + secondChunk.length).toString()}
})));
const obj = await r2.get('test123');
expect((await obj?.text())?.length).toBe(totalLength);
});
});

551
src/uploadHandler.ts Normal file
View File

@ -0,0 +1,551 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {error, IRequest, json, Router, RouterType, StatusError} from 'itty-router';
import {Buffer} from 'node:buffer';
import {AsyncLock, generateParts, readIntFromHeader, toBase64, WritableStreamBuffer} from './util';
import {Env} from './index';
import {Digester, noopDigester, sha256Digester} from './digest';
import {parseChecksum, parseUploadMetadata} from './parse';
export const TUS_VERSION = '1.0.0';
// uploads larger than this will be rejected
export const MAX_UPLOAD_LENGTH_BYTES = 1024 * 1024 * 100;
export const X_SIGNAL_CHECKSUM_SHA256 = 'X-Signal-Checksum-Sha256';
// how long an unfinished upload lives in ms
const UPLOAD_EXPIRATION_MS = 7 * 24 * 60 * 60 * 1000;
// how much we'll buffer in memory, must be greater than or equal to R2's min part size
// https://developers.cloudflare.com/r2/objects/multipart-objects/#limitations
const BUFFER_SIZE = 1024 * 1024 * 5;
// how much of the upload we've written
const UPLOAD_OFFSET_KEY = 'upload-offset';
// key for StoredUploadInfo
const UPLOAD_INFO_KEY = 'upload-info';
// Stored for each part with the key of the multipart part number. Part numbers start with 1
interface StoredR2Part {
part: R2UploadedPart,
// the length of the part
length: number
}
// Infrequently changing information about the upload
interface StoredUploadInfo {
uploadLength?: number,
checksum?: Uint8Array,
multipartUploadId?: string
}
// UploadHandlers represent an in-progress resumable upload to cloudflare R2.
//
// This class is a 'template' for a cloudflare durable object, which are
// created by upstream workers for each unique object upload. See
// https://developers.cloudflare.com/workers/runtime-apis/durable-objects/
//
// Uploads use the TUS protocol https://tus.io/protocols/resumable-upload.
// When a client interacts with a particular upload name, all requests are
// routed to the durable object id derived from that name (or a new durable
// object is created if it doesn't already exist). POSTs initialize the
// upload, and subsequent PATCH requests append to it. If a client gets
// disconnected, a HEAD returns the current upload offset for the upload so
// the upload can be resumed.
//
// Uploads are staged via R2 multipart upload, which is completed when the
// client uploads the last byte. Multipart upload only supports 5MB boundaries,
// which is more than we'd like clients to have to reupload. If a client does
// not complete the upload in a single request (either because of a disconnect
// or because the request is broken into multiple patches), the remainder after
// the last 5MB boundary is saved in a temporary R2 object, which is then read
// on a subsequent PATCH.
export class UploadHandler {
state: DurableObjectState;
env: Env;
router: RouterType;
parts: StoredR2Part[];
multipart: R2MultipartUpload | undefined;
// only allow a single request to operate at a time
requestGate: AsyncLock;
constructor(state: DurableObjectState, env: Env) {
this.state = state;
this.env = env;
this.parts = [];
this.requestGate = new AsyncLock();
this.router = Router()
.post('/upload/:bucket', this.exclusive(this.create))
.patch('/upload/:bucket/:id', this.exclusive(this.patch))
.head('/upload/:bucket/:id', this.exclusive(this.head))
.all('*', () => error(404));
}
// forbid concurrent requests while running clsMethod
exclusive(clsMethod: (r: IRequest) => Promise<Response>): (r: IRequest) => Promise<Response> {
return async request => {
const release = await this.requestGate.lock();
try {
return await clsMethod.bind(this)(request);
} catch (e) {
if (e instanceof UnrecoverableError) {
try {
const r2Key = (e as UnrecoverableError).r2Key;
// this upload can never make progress, try to clean up
await this.cleanup(r2Key);
} catch (cleanupError) {
// ignore errors cleaning up
console.error('error cleaning up ' + cleanupError);
}
}
throw e;
} finally {
release();
}
};
}
fetch(request: Request): Promise<Response> {
return this.router.handle(request).then(json).catch(e => {
if (e instanceof StatusError) {
return error(e);
}
console.error('server error processing request: ' + e);
throw e;
});
}
async alarm() {
return await this.cleanup();
}
// create a new TUS upload
async create(request: IRequest): Promise<Response> {
const uploadMetadata = parseUploadMetadata(request.headers);
const checksum = parseChecksum(request.headers);
const r2Key = uploadMetadata.filename;
if (r2Key == null) {
return error(400, 'bad filename metadata');
}
const existingUploadOffset: number | undefined = await this.state.storage.get(UPLOAD_OFFSET_KEY);
if (existingUploadOffset != null && existingUploadOffset > 0) {
console.log('duplicate object creation');
await this.cleanup(r2Key);
return error(409, 'object already exists');
}
// The client may provide an initial request body (creation-with-upload)
const contentType = request.headers.get('Content-Type');
if (contentType != null && contentType !== 'application/offset+octet-stream') {
return error(415, 'body requires application/offset+octet-stream content-type');
}
const hasContent = request.body != null && contentType != null;
const uploadLength = readIntFromHeader(request.headers, 'Upload-Length');
const uploadDeferLength = readIntFromHeader(request.headers, 'Upload-Defer-Length');
if (isNaN(uploadLength) && isNaN(uploadDeferLength)) {
return error(400, 'must contain Upload-Length or Upload-Defer-Length header');
}
if (!isNaN(uploadDeferLength) && uploadDeferLength !== 1) {
return error(400, 'bad Upload-Defer-Length');
}
const uploadInfo: StoredUploadInfo = {};
const expiration = new Date(Date.now() + UPLOAD_EXPIRATION_MS);
await this.state.storage.setAlarm(expiration);
if (!isNaN(uploadLength)) {
uploadInfo.uploadLength = uploadLength;
}
if (checksum != null) {
uploadInfo.checksum = checksum;
}
await this.state.storage.put(UPLOAD_OFFSET_KEY, 0);
await this.state.storage.put(UPLOAD_INFO_KEY, uploadInfo);
const uploadLocation = new URL(r2Key, request.url);
const uploadOffset = hasContent
? await this.appendBody(r2Key, request.body, 0, uploadInfo)
: 0;
return new Response(null, {
status: 201,
headers: new Headers({
'Location': uploadLocation.href,
'Upload-Expires': expiration.toString(),
'Upload-Offset': uploadOffset.toString(),
'Tus-Resumable': TUS_VERSION
})
});
}
// get the current upload offset to resume an upload
async head(_request: IRequest): Promise<Response> {
const offset: number | undefined = await this.state.storage.get(UPLOAD_OFFSET_KEY);
if (offset == null) {
return error(404);
}
return new Response('', {
headers: new Headers({
'Upload-Offset': offset.toString(),
'Upload-Expires': (await this.expirationTime()).toString(),
'Cache-Control': 'no-store',
'Tus-Resumable': TUS_VERSION
})
});
}
// append to the upload at the current upload offset
async patch(request: IRequest): Promise<Response> {
const r2Key = request.params.id;
let uploadOffset: number | undefined = await this.state.storage.get(UPLOAD_OFFSET_KEY);
if (uploadOffset == null) {
return error(404);
}
const headerOffset = readIntFromHeader(request.headers, 'Upload-Offset');
if (uploadOffset !== headerOffset) {
return error(409, 'incorrect upload offset');
}
const uploadInfo: StoredUploadInfo | undefined = await this.state.storage.get(UPLOAD_INFO_KEY);
if (uploadInfo == null) {
throw new UnrecoverableError('existing upload should have had uploadInfo', r2Key);
}
const headerUploadLength = readIntFromHeader(request.headers, 'Upload-Length');
if (uploadInfo.uploadLength != null && !isNaN(headerUploadLength) && uploadInfo.uploadLength !== headerUploadLength) {
return error(400, 'upload length cannot change');
}
// check if we now know the upload length
if (uploadInfo.uploadLength == null && !isNaN(headerUploadLength)) {
uploadInfo.uploadLength = headerUploadLength;
await this.state.storage.put(UPLOAD_INFO_KEY, uploadInfo);
}
if (request.body == null) {
return error(400, 'Must provide request body');
}
uploadOffset = await this.appendBody(r2Key, request.body, uploadOffset, uploadInfo);
return new Response(null, {
status: 204, headers: new Headers({
'Upload-Offset': uploadOffset.toString(),
'Upload-Expires': (await this.expirationTime()).toString(),
'Tus-Resumable': TUS_VERSION
})
});
}
// Append body to the upload starting at uploadOffset. Returns the new uploadOffset
//
// The body is streamed into a fixed length buffer. If the object fits into a single
// buffer, it's uploaded directly. Otherwise, each full buffer is uploaded to a
// multipart transaction.
//
// If the stream ends but we have not hit uploadLength (either due to an error or a
// partial upload), the remaining buffer is written to a temporary object. When
// the upload is resumed, we retrieve the temporary and repopulate the buffer.
//
// If the client provides a checksum we need to do two things:
// A. Reject the upload if it doesn't match the provided checksum
// B. Once the object is uploaded, return the checksum on subsequent GET/HEAD requests
//
// Depending on how the object is uploaded, we achieve A and B different ways. If the object can be uploaded without
// using mulitpart upload, R2 provides support for A and B directly. Otherwise, we support B by
// adding custom metadata to the object when we create the multipart upload. For A, if the client manages to upload
// the object in one-shot we calculate the digest as it comes in. Otherwise, after the multipart upload is
// finished, we retrieve the object from R2 and recompute the digest.
async appendBody(r2Key: string, body: ReadableStream<Uint8Array>, uploadOffset: number, uploadInfo: StoredUploadInfo): Promise<number> {
const uploadLength = uploadInfo.uploadLength;
if ((uploadLength || 0) > MAX_UPLOAD_LENGTH_BYTES) {
await this.cleanup(r2Key);
throw new StatusError(413, 'Upload-Length exceeds maximum upload size');
}
// We'll repeatedly use this to buffer data we'll send to R2
const mem = new WritableStreamBuffer(new ArrayBuffer(BUFFER_SIZE));
uploadOffset = await this.resumeUpload(r2Key, uploadOffset, uploadInfo, mem);
const isSinglePart = uploadLength != null && uploadLength <= BUFFER_SIZE;
const checksum: Uint8Array | undefined = uploadInfo.checksum;
// optimization: only bother calculating the streams checksum if the client provided it, and were not resuming
const digester: Digester = checksum != null && uploadOffset == 0 && !isSinglePart ? sha256Digester() : noopDigester();
for await (const part of generateParts(body, mem)) {
const newLength = uploadOffset + part.bytes.byteLength;
if (uploadLength != null && newLength > uploadLength) {
await this.cleanup(r2Key);
throw new StatusError(413, 'body exceeds Upload-Length');
}
if (newLength > MAX_UPLOAD_LENGTH_BYTES) {
await this.cleanup(r2Key);
throw new StatusError(413, 'body exceeds maximum upload size');
}
await digester.update(part.bytes);
switch (part.kind) {
case 'intermediate': {
if (this.multipart == null) {
this.multipart = await this.r2CreateMultipartUpload(r2Key, uploadInfo);
}
this.parts.push({
part: await this.multipart.uploadPart(this.parts.length + 1, part.bytes),
length: part.bytes.byteLength
});
uploadOffset += part.bytes.byteLength;
const writePart = this.state.storage.put(this.parts.length.toString(), this.parts.at(-1));
const writeOffset = this.state.storage.put(UPLOAD_OFFSET_KEY, uploadOffset);
await Promise.all([writePart, writeOffset]);
break;
}
case 'final':
case 'error': {
const finished = uploadLength != null && uploadOffset + part.bytes.byteLength === uploadLength;
if (!finished) {
// write the partial part to a temporary object so we can rehydrate it
// later, and then we're done
await this.env.BUCKET.put(this.tempkey(), part.bytes);
uploadOffset += part.bytes.byteLength;
await this.state.storage.put(UPLOAD_OFFSET_KEY, uploadOffset);
} else if (!this.multipart) {
// all the bytes fit into a single in memory buffer, so we can just upload
// it directly without using multipart
await this.r2Put(r2Key, part.bytes, checksum);
uploadOffset += part.bytes.byteLength;
await this.cleanup();
} else {
// upload the last part (can be less than the 5mb min part size), then complete the upload
const uploadedPart = await this.multipart.uploadPart(this.parts.length + 1, part.bytes);
this.parts.push({part: uploadedPart, length: part.bytes.byteLength});
await this.r2CompleteMultipartUpload(r2Key, await digester.digest(), checksum);
uploadOffset += part.bytes.byteLength;
await this.cleanup();
}
break;
}
}
}
return uploadOffset;
}
// Check a checksum, throwing a 415 if the checksum does not match
async checkChecksum(r2Key: string, expected: Uint8Array, actual: ArrayBuffer) {
if (!Buffer.from(actual).equals(expected)) {
await this.cleanup(r2Key);
throw new StatusError(415, `The SHA-256 checksum you specified ${toBase64(actual)} did not match what we received ${toBase64(expected)}.`);
}
}
// Compute the SHA-256 checksum of a remote r2 object
async retrieveChecksum(r2Key: string): Promise<ArrayBuffer> {
const body = await this.env.BUCKET.get(r2Key);
if (body == null) {
throw new UnrecoverableError(`Object ${r2Key} not found directly after uploading`, r2Key);
}
const digest = new crypto.DigestStream('SHA-256');
await body.body.pipeTo(digest);
return await digest.digest;
}
// Prepare to begin uploading from uploadOffset.
// Resume any ongoing multipart upload, and fetch stashed temporary object from R2 into mem.
//
// Return the uploadOffset for the first byte of mem
async resumeUpload(r2Key: string, uploadOffset: number, uploadInfo: StoredUploadInfo, mem: WritableStreamBuffer): Promise<number> {
if (uploadOffset === 0) {
return 0;
}
// Resume any existing multipart upload
const partOffset = await this.hydrateParts(r2Key, uploadOffset, uploadInfo);
if (partOffset === uploadOffset) {
// the uploadOffset the client is starting at picks up exactly at the end
// of the last multipart part we uploaded
return partOffset;
}
// Otherwise, we should have stashed a temporary object in R2 with whatever was
// left-over after the last part we uploaded
const tempobj = await this.env.BUCKET.get(this.tempkey());
if (tempobj == null) {
throw new UnrecoverableError(`we claimed to have ${uploadOffset} bytes, only had ${partOffset}`, r2Key);
}
if (partOffset + tempobj.size !== uploadOffset) {
throw new UnrecoverableError(`we claimed to have ${uploadOffset} bytes, had ${partOffset + tempobj.size}`, r2Key);
}
// Fill mem with the temporary object
if (tempobj.size > mem.buf.byteLength) {
throw new UnrecoverableError(`bad temp object ${this.tempkey()} of length ${tempobj.size}`, r2Key);
}
// copy into our temp buffer
await tempobj.body.pipeTo(new WritableStream({
write(chunk) {
return mem.write(chunk);
}
}));
// return the location in the overall upload where our memory buffer starts
return uploadOffset - tempobj.size;
}
// load part infos from durable object storage
async hydrateParts(r2Key: string, uploadOffset: number, uploadInfo: StoredUploadInfo): Promise<number> {
if (this.multipart != null) {
return this.parts
.map(p => p.length)
.reduce((a, b) => a + b);
}
let partOffset = 0;
for (; ;) {
const part: StoredR2Part | undefined = await this.state.storage.get((this.parts.length + 1).toString());
if (part == null) {
break;
}
partOffset += part.length;
if (partOffset > uploadOffset) {
// this part is past where we've told the client to start uploading
break;
}
this.parts.push(part);
}
if (this.parts.length > 0) {
if (uploadInfo.multipartUploadId == null) {
throw new UnrecoverableError(`had ${this.parts.length} stored parts but no stored multipartUploadId`, r2Key);
}
this.multipart = this.env.BUCKET.resumeMultipartUpload(r2Key, uploadInfo.multipartUploadId);
}
return partOffset;
}
async r2CreateMultipartUpload(r2Key: string, uploadInfo: StoredUploadInfo): Promise<R2MultipartUpload> {
const customMetadata: Record<string, string> = {};
if (uploadInfo.checksum != null) {
customMetadata[X_SIGNAL_CHECKSUM_SHA256] = toBase64(uploadInfo.checksum);
}
const upload = await this.env.BUCKET.createMultipartUpload(r2Key, {customMetadata});
uploadInfo.multipartUploadId = upload.uploadId;
await this.state.storage.put(UPLOAD_INFO_KEY, uploadInfo);
return upload;
}
async r2Put(r2Key: string, bytes: Uint8Array, checksum?: Uint8Array) {
try {
await this.env.BUCKET.put(r2Key, bytes, {sha256: checksum});
} catch (e) {
// R2 bindings currently has no structured errors :( . We need to check for expected errors
// by searching error messages. These usually contain a numeric error code, but not always
if (e != null && e instanceof Object && Object.prototype.hasOwnProperty.call(e, 'message')) {
const msg: string = (e as { message: string }).message;
// "put: The SHA-256 checksum you specified did not match what we received.
// You provided a SHA-256 checksum with value: <sha>
// Actual SHA-256 was: <sha> (10037)"
if (msg.toLowerCase().includes('sha-256') || msg.includes('10037')) {
console.error(`checksum failure: ${msg}`);
await this.cleanup();
throw new StatusError(415, msg);
}
}
throw e;
}
}
async r2CompleteMultipartUpload(r2Key: string, actualChecksum?: ArrayBuffer, expectedChecksum?: Uint8Array) {
if (this.multipart == null) {
throw new UnrecoverableError('cannot call complete multipart with no multipart upload', r2Key);
}
// If we were able to calculate the streaming digest, we can accept or reject now.
if (actualChecksum != null && expectedChecksum != null) {
await this.checkChecksum(r2Key, expectedChecksum, actualChecksum);
}
await this.multipart.complete(this.parts.map(storedPart => storedPart.part));
// Otherwise we have to compute the digest from the finished upload
if (actualChecksum == null && expectedChecksum != null) {
await this.checkChecksum(r2Key, expectedChecksum, await this.retrieveChecksum(r2Key));
}
}
tempkey(): string {
return 'temporary/' + this.state.id.toString();
}
// Cleanup the state for this durable object. If r2Key is provided, the method will make
// a best-effort attempt to clean any temporary R2 objects that may exist.
//
// Cleanup should be called when:
// 1. The upload is successfully completed
// 2. The server experiences an error condition where retrying would be futile. Cleanup ensures a subsequent retry
// will hit a 404.
// 3. The client has made a mistake uploading that cannot be fixed by retrying with different arguments. e.g.,
// an upload with an incorrect checksum.
async cleanup(r2Key?: string): Promise<void> {
// try our best to clean up R2 state we may have left around, but
// if we fail these objects/transactions will eventually expire
try {
await this.env.BUCKET.delete(this.tempkey());
if (r2Key != null) {
await this.hydrateParts(
r2Key,
await this.state.storage.get(UPLOAD_OFFSET_KEY) || 0,
await this.state.storage.get(UPLOAD_INFO_KEY) || {});
if (this.multipart != null) {
await this.multipart.abort();
}
}
} catch (e) {
console.log('failed to cleanup R2 state: ' + e);
}
this.multipart = undefined;
this.parts = [];
await this.state.storage.deleteAll();
await this.state.storage.deleteAlarm();
}
// After this time, the upload can no longer be used
async expirationTime(): Promise<Date> {
const expiration = await this.state.storage.getAlarm();
if (expiration == null) {
return new Date();
}
return new Date(expiration);
}
}
class UnrecoverableError extends Error {
r2Key: string;
constructor(message: string, r2Key: string) {
super(message);
this.name = this.constructor.name;
this.r2Key = r2Key;
}
}

56
src/util.test.ts Normal file
View File

@ -0,0 +1,56 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {describe, expect, it} from 'vitest';
import {AsyncLock, Release, WritableStreamBuffer} from './util';
describe('WritableStreamBuffer', () => {
it('copies what fits', async () => {
const st = new WritableStreamBuffer(new ArrayBuffer(10));
const written = st.writeUpTo(new Uint8Array(new ArrayBuffer(11)));
expect(written).toBe(10);
expect(st.offset).toBe(10);
expect(st.writeUpTo(new Uint8Array(new ArrayBuffer(1)))).toBe(0);
expect(st.offset).toBe(10);
});
});
describe('AsyncLock', () => {
it('only lets one through', async () => {
const lock = new AsyncLock();
const release = await lock.lock();
const queued = lock.lock();
let done = false;
queued.then(() => done = true);
expect(done).toBeFalsy();
release();
await queued;
expect(done).toBeTruthy();
});
it('can queue waiters', async () => {
const lock = new AsyncLock();
let release = await lock.lock();
// queue up 10 requests behind currently executing one
const waiters: { promise: Promise<Release>, done: boolean }[] = [];
for (let i = 0; i < 10; i++) {
const waiter = {
promise: lock.lock(),
done: false
};
waiter.promise.then(() => waiter.done = true);
waiters.push(waiter);
}
expect(waiters.every(waiter => !waiter.done)).toBeTruthy();
// finishing previous request should allow next one to proceed
for (let i = 0; i < 10; i++) {
release();
release = await (waiters[i].promise);
expect(waiters.slice(i + 1).every(waiter => !waiter.done)).toBeTruthy();
}
});
});

144
src/util.ts Normal file
View File

@ -0,0 +1,144 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {Buffer} from 'node:buffer';
import {StatusError} from 'itty-router';
export function readIntFromHeader(headers: Headers, name: string): number {
const headerString = headers.get(name);
if (headerString == null) {
return NaN;
}
return parseInt(headerString);
}
export function toBase64(v: Uint8Array | ArrayBuffer): string {
if (v instanceof Uint8Array) {
return Buffer.from(v.buffer, v.byteOffset, v.byteLength).toString('base64');
} else {
return Buffer.from(v).toString('base64');
}
}
// Parse binary data from a base64 string
export function fromBase64(s: string): Uint8Array | undefined {
try {
return Buffer.from(s, 'base64');
} catch (err) {
return undefined;
}
}
export class WritableStreamBuffer {
buf: ArrayBuffer;
offset: number;
constructor(buf: ArrayBuffer) {
this.buf = buf;
this.offset = 0;
}
write(chunk: Uint8Array) {
const remaining = this.buf.byteLength - this.offset;
if (chunk.byteLength > remaining) {
throw new RangeError('chunk does not fit');
}
this.writeUpTo(chunk);
}
writeUpTo(chunk: Uint8Array): number {
const remaining = this.buf.byteLength - this.offset;
const toWrite = Math.min(remaining, chunk.byteLength);
new Uint8Array(this.buf, this.offset).set(chunk.subarray(0, toWrite));
this.offset += toWrite;
return toWrite;
}
view(): Uint8Array {
return new Uint8Array(this.buf, 0, this.offset);
}
reset() {
this.offset = 0;
}
}
export interface IntermediatePart {
kind: 'intermediate',
bytes: Uint8Array
}
export interface FinalPart {
kind: 'final',
bytes: Uint8Array
}
export interface ErrorPart {
kind: 'error',
error: StatusError,
bytes: Uint8Array
}
export type Part = IntermediatePart | FinalPart | ErrorPart
// Take an arbitrary length stream and fill an in-memory buffer, emitting a view of the buffer every time the buffer
// is filled. After emitting an item the buffer is reused, so the caller must finish using the buffer before it
// continues iterating.
//
// If an error is encountered reading the stream, the final part generated by the stream will be an error part
// containing whatever was read before the error was encountered.
export async function* generateParts(body: ReadableStream<Uint8Array>, mem: WritableStreamBuffer): AsyncGenerator<Part> {
try {
for await (let chunk of body) {
while (chunk.byteLength > 0) {
const copied = mem.writeUpTo(chunk);
chunk = chunk.subarray(copied, chunk.byteLength);
// When we've filled mem, we want to emit a part. But we should only do it if we know
// there's more body to write. Otherwise, if the upload size is exactly the part size
// we would end up emitting an empty 'final' part which is unnecessary.
if (chunk.byteLength > 0 && mem.offset >= mem.buf.byteLength) {
// the memory buffer's position is at its total length
yield {kind: 'intermediate', bytes: mem.view()};
mem.reset();
}
}
}
yield {kind: 'final', bytes: mem.view()};
} catch (e) {
const msg = `error reading request body: ${e}`;
console.debug(msg);
yield {kind: 'error', bytes: mem.view(), error: new StatusError(400, msg)};
}
mem.reset();
}
export type Release = () => void;
export class AsyncLock {
p: Promise<void> | null;
constructor() {
this.p = null;
}
// Asynchronously wait for our turn to execute. Returns Release which should be called
// when the critical section has completed
async lock(): Promise<Release> {
// If there is no active promise we can acquire the lock. We loop since
// someone else may grab the lock before us, in that case we go back
// to waiting
while (this.p != null) {
await this.p;
}
let resolver: (value: (void | PromiseLike<void>)) => void;
this.p = new Promise(resolve => {
resolver = resolve;
});
return () => {
this.p = null;
resolver();
};
}
}

106
tsconfig.json Normal file
View File

@ -0,0 +1,106 @@
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig.json to read more about this file */
/* Projects */
// "incremental": true, /* Enable incremental compilation */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./", /* Specify the folder for .tsbuildinfo incremental compilation files. */
// "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects */
// "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "es2021" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,
"lib": [
"es2021"
] /* Specify a set of bundled library declaration files that describe the target runtime environment. */,
"jsx": "react" /* Specify what JSX code is generated. */,
// "experimentalDecorators": true, /* Enable experimental support for TC39 stage 2 draft decorators. */
// "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */
// "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h' */
// "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
// "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using `jsx: react-jsx*`.` */
// "reactNamespace": "", /* Specify the object invoked for `createElement`. This only applies when targeting `react` JSX emit. */
// "noLib": true, /* Disable including any library files, including the default lib.d.ts. */
// "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */
/* Modules */
"module": "es2022" /* Specify what module code is generated. */,
// "rootDir": "./", /* Specify the root folder within your source files. */
"moduleResolution": "node" /* Specify how TypeScript looks up a file from a given module specifier. */,
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */
// "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */
// "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */
// "typeRoots": [], /* Specify multiple folders that act like `./node_modules/@types`. */
"types": [
"@cloudflare/workers-types",
"vitest-environment-miniflare/globals"
] /* Specify type package names to be included without being referenced in a source file. */,
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
"resolveJsonModule": true /* Enable importing .json files */,
// "noResolve": true, /* Disallow `import`s, `require`s or `<reference>`s from expanding the number of files TypeScript should add to a project. */
/* JavaScript Support */
"allowJs": true /* Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files. */,
"checkJs": false /* Enable error reporting in type-checked JavaScript files. */,
// "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from `node_modules`. Only applicable with `allowJs`. */
/* Emit */
// "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
// "declarationMap": true, /* Create sourcemaps for d.ts files. */
// "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
// "sourceMap": true, /* Create source map files for emitted JavaScript files. */
// "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If `declaration` is true, also designates a file that bundles all .d.ts output. */
// "outDir": "./", /* Specify an output folder for all emitted files. */
// "removeComments": true, /* Disable emitting comments. */
"noEmit": true /* Disable emitting files from a compilation. */,
// "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
// "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types */
// "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
// "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */
// "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
// "newLine": "crlf", /* Set the newline character for emitting files. */
// "stripInternal": true, /* Disable emitting declarations that have `@internal` in their JSDoc comments. */
// "noEmitHelpers": true, /* Disable generating custom helper functions like `__extends` in compiled output. */
// "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */
// "preserveConstEnums": true, /* Disable erasing `const enum` declarations in generated code. */
// "declarationDir": "./", /* Specify the output directory for generated declaration files. */
// "preserveValueImports": true, /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
/* Interop Constraints */
"isolatedModules": true /* Ensure that each file can be safely transpiled without relying on other imports. */,
"allowSyntheticDefaultImports": true /* Allow 'import x from y' when a module doesn't have a default export. */,
// "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */,
// "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
"forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,
/* Type Checking */
"strict": true /* Enable all strict type-checking options. */,
// "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied `any` type.. */
// "strictNullChecks": true, /* When type checking, take into account `null` and `undefined`. */
// "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
// "strictBindCallApply": true, /* Check that the arguments for `bind`, `call`, and `apply` methods match the original function. */
// "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */
// "noImplicitThis": true, /* Enable error reporting when `this` is given the type `any`. */
// "useUnknownInCatchVariables": true, /* Type catch clause variables as 'unknown' instead of 'any'. */
// "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
// "noUnusedLocals": true, /* Enable error reporting when a local variables aren't read. */
// "noUnusedParameters": true, /* Raise an error when a function parameter isn't read */
// "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */
// "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */
// "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */
// "noUncheckedIndexedAccess": true, /* Include 'undefined' in index signature results */
// "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */
// "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type */
// "allowUnusedLabels": true, /* Disable error reporting for unused labels. */
// "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true /* Skip type checking all .d.ts files. */
}
}

17
vitest.config.ts Normal file
View File

@ -0,0 +1,17 @@
// Copyright 2023 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
import {defineConfig} from 'vitest/config';
export default defineConfig({
test: {
environment: 'miniflare',
environmentOptions: {
modules: true,
scriptPath: './dist/index.js',
durableObjects: {
UPLOAD_HANDLER: 'UploadHandler',
},
},
},
});

31
wrangler.toml Normal file
View File

@ -0,0 +1,31 @@
name = "cdn3-dev"
main = "src/index.ts"
compatibility_date = "2023-05-10"
compatibility_flags = [ "nodejs_compat" ]
logpush = true
# Specifies the r2 buckets. r2 bucket names are scoped to your account (not global). The buckets should be publicly inaccessible.
r2_buckets = [{ binding = "BUCKET", bucket_name = "attachments-staging", preview_bucket_name = "attachments-staging" }]
# The path prefix for uploads/downloads, ex. localhost/upload/<PATH_PREFIX>/<object-id>
vars.PATH_PREFIX = "attachments"
durable_objects.bindings = [{name = "UPLOAD_HANDLER", class_name = "UploadHandler"}]
[[migrations]]
tag = "v1"
new_classes = ["UploadHandler"]
[env.production]
name = "cdn3"
durable_objects.bindings = [{name = "UPLOAD_HANDLER", class_name = "UploadHandler"}]
r2_buckets = [{ binding = "BUCKET", bucket_name = "attachments", preview_bucket_name = "attachments" }]
vars.PATH_PREFIX = "attachments"
[env.staging]
name = "cdn3-staging"
durable_objects.bindings = [{name = "UPLOAD_HANDLER", class_name = "UploadHandler"}]
r2_buckets = [{ binding = "BUCKET", bucket_name = "attachments-staging", preview_bucket_name = "attachments-staging" }]
vars.PATH_PREFIX = "attachments"
# To set an auth secret,
# wrangler secrets put SHARED_AUTH_SECRET