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[*.]# Threema Web

Build status License Docker Image

⚠️ Note: Threema Web is in maintenance mode while we are working on Threema for Desktop 2.0, which should resolve some of the long-standing issues we were having with Threema Web. We will still do regular maintenance and fix critical bugs, but for now there will be no major new features or non-critical bugfixes. See threema-ch#996 for more details.

Threema Web is a web client for Threema, a privacy-focussed end-to-end encrypted mobile messenger hosted and developed in Switzerland. With Threema Web, you can use Threema on your Desktop without compromising security.

https://web.threema.ch/

Screenshot

Threema Web establishes a connection between Desktop and mobile device using WebRTC (Android) or encrypted WebSockets (iOS). Signaling and data is end-to-end encrypted with SaltyRTC.

For more information, see the Threema Cryptography Whitepaper.

Bug Reports and Feature Requests

If you find a bug in Threema Web, feel free to open an issue on GitHub. Please make sure that your bug report hasn’t already been filed by using the search function.

Note that Threema Web is in maintenance mode while we are working on a new solution that should resolve some of the long-standing issues we were having with Threema Web. We will still do regular maintenance and fix critical bugs, but for now there will be no major new features or non-critical bugfixes. See threema-ch#996 for details.

Beta Testing

We may occasionally deploy experimental branches on https://web-beta.threema.ch which you are encouraged to test. If you encounter problems, please open an issue and include the experiment’s version number (e.g. 1.2.3-experiment-beta4).

Translating

If you want to help translate Threema Web to your language, please check out TRANSLATING.md!

Protocol

The protocol used to communicate between the Threema app and Threema Web is documented here.

Development

Threema Web is written using TypeScript and AngularJS 1. Dependencies are managed with npm. You currently need Node.js 18 to build Threema Web. (Note that Node.js is only a build dependency, the result is plain old client-side JavaScript.)

If your default NodeJS version is not 18, use nvm to install it:

nvm install
nvm use

Install development dependencies:

npm install

Run the dev server:

npm run devserver

Then open the URL in your browser:

firefox http://localhost:9966

(Note that this setup should not be used in production. To run Threema Web on a server, please follow the instructions at docs/self_hosting.md.)

Testing

To run unit tests:

npm run build:unittests && npm run testserver
firefox http://localhost:7777/tests/testsuite.html

To run UI tests:

npm run build  # Required for CSS to be rebuilt
npm run test:ui <browser>

For example:

npm run test:ui firefox
npm run test:ui chrome

You can also filter the test cases:

npm run test:ui firefox emoji

To run linting checks:

npm run lint

You can also install a pre-push hook to do the linting:

echo -e '#!/bin/sh\nnpm run lint' > .git/hooks/pre-push
chmod +x .git/hooks/pre-push

Configuration

The configuration of Threema Web can be tweaked in src/config.ts and src/userconfig.js / src/userconfig.overrides.js (see src/userconfig.overrides.js.example. The config variables are defined at build time, and the userconfig variables can be modified at runtime. Please refer to those files for documentation on what variables exist and how to configure them.

In the Docker image, all userconfig variables can be overridden using env variables. See docs/docker.md for more information.

Self Hosting

For instructions on how to host your own version of Threema Web, please refer to docs/self_hosting.md.

Contributing

Contributions to Threema Web are welcome! Please open a pull request with your proposed changes.

Security

Every Threema Web release will be tagged. The git tags are cryptographically signed using the following PGP key:

pub   rsa4096 2016-09-06 [SC] [expires: 2026-09-04]
      E7AD D991 4E26 0E8B 35DF  B506 65FD E935 573A CDA6
uid           Threema Signing Key <[email protected]>

The public key can be found on Keybase.

If you discover a security issue in Threema, please adhere to the coordinated vulnerability disclosure model. To be eligible for a bug bounty, please file a report on GObugfree (where all the details, including the bounty levels, are listed). If you’re not interested in the bug bounty program, you can contact us via Threema or by email; for contact details, see threema.ch/contact (section “Security”).

License

Threema Web license:

Threema Web.

Copyright © 2016-2023 Threema GmbH (https://threema.ch/).

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

For third party library licenses, see LICENSE-3RD-PARTY.txt.

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