322 lines
14 KiB
Markdown
322 lines
14 KiB
Markdown
[](https://matrix.to/#/#element-web:matrix.org)
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[](https://localazy.com/p/element-web)
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[](https://sonarcloud.io/summary/new_code?id=element-web)
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[](https://sonarcloud.io/summary/new_code?id=element-web)
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[](https://sonarcloud.io/summary/new_code?id=element-web)
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[](https://sonarcloud.io/summary/new_code?id=element-web)
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# Element
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Element (formerly known as Vector and Riot) is a Matrix web client built using the [Matrix
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React SDK](https://github.com/matrix-org/matrix-react-sdk).
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# Supported Environments
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Element has several tiers of support for different environments:
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- Supported
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- Definition: Issues **actively triaged**, regressions **block** the release
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- Last 2 major versions of Chrome, Firefox, and Edge on desktop OSes
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- Last 2 versions of Safari
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- Latest release of official Element Desktop app on desktop OSes
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- Desktop OSes means macOS, Windows, and Linux versions for desktop devices
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that are actively supported by the OS vendor and receive security updates
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- Experimental
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- Definition: Issues **accepted**, regressions **do not block** the release
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- Element as an installed PWA via current stable version of Chrome
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- Mobile web for current stable version of Chrome, Firefox, and Safari on Android, iOS, and iPadOS
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- Not supported
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- Definition: Issues only affecting unsupported environments are **closed**
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- Everything else
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For accessing Element on an Android or iOS device, we currently recommend the
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native apps [element-android](https://github.com/element-hq/element-android)
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and [element-ios](https://github.com/element-hq/element-ios).
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# Getting Started
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The easiest way to test Element is to just use the hosted copy at <https://app.element.io>.
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The `develop` branch is continuously deployed to <https://develop.element.io>
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for those who like living dangerously.
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To host your own instance of Element see [Installing Element Web](docs/install.md).
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To install Element as a desktop application, see [Running as a desktop app](#running-as-a-desktop-app) below.
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# Important Security Notes
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## Separate domains
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We do not recommend running Element from the same domain name as your Matrix
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homeserver. The reason is the risk of XSS (cross-site-scripting)
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vulnerabilities that could occur if someone caused Element to load and render
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malicious user generated content from a Matrix API which then had trusted
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access to Element (or other apps) due to sharing the same domain.
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We have put some coarse mitigations into place to try to protect against this
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situation, but it's still not good practice to do it in the first place. See
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<https://github.com/element-hq/element-web/issues/1977> for more details.
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## Configuration best practices
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Unless you have special requirements, you will want to add the following to
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your web server configuration when hosting Element Web:
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- The `X-Frame-Options: SAMEORIGIN` header, to prevent Element Web from being
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framed and protect from [clickjacking][owasp-clickjacking].
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- The `frame-ancestors 'self'` directive to your `Content-Security-Policy`
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header, as the modern replacement for `X-Frame-Options` (though both should be
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included since not all browsers support it yet, see
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[this][owasp-clickjacking-csp]).
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- The `X-Content-Type-Options: nosniff` header, to [disable MIME
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sniffing][mime-sniffing].
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- The `X-XSS-Protection: 1; mode=block;` header, for basic XSS protection in
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legacy browsers.
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[mime-sniffing]: https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types#mime_sniffing
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[owasp-clickjacking-csp]: https://cheatsheetseries.owasp.org/cheatsheets/Clickjacking_Defense_Cheat_Sheet.html#content-security-policy-frame-ancestors-examples
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[owasp-clickjacking]: https://cheatsheetseries.owasp.org/cheatsheets/Clickjacking_Defense_Cheat_Sheet.html
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If you are using nginx, this would look something like the following:
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```
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add_header X-Frame-Options SAMEORIGIN;
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add_header X-Content-Type-Options nosniff;
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add_header X-XSS-Protection "1; mode=block";
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add_header Content-Security-Policy "frame-ancestors 'self'";
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```
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For Apache, the configuration looks like:
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```
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Header set X-Frame-Options SAMEORIGIN
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Header set X-Content-Type-Options nosniff
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Header set X-XSS-Protection "1; mode=block"
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Header set Content-Security-Policy "frame-ancestors 'self'"
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```
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Note: In case you are already setting a `Content-Security-Policy` header
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elsewhere, you should modify it to include the `frame-ancestors` directive
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instead of adding that last line.
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# Building From Source
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Element is a modular webapp built with modern ES6 and uses a Node.js build system.
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Ensure you have the latest LTS version of Node.js installed.
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Using `yarn` instead of `npm` is recommended. Please see the Yarn [install
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guide](https://classic.yarnpkg.com/en/docs/install) if you do not have it already.
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1. Install or update `node.js` so that your `node` is at least the current recommended LTS.
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1. Install `yarn` if not present already.
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1. Clone the repo: `git clone https://github.com/element-hq/element-web.git`.
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1. Switch to the element-web directory: `cd element-web`.
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1. Install the prerequisites: `yarn install`.
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- If you're using the `develop` branch, then it is recommended to set up a
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proper development environment (see [Setting up a dev
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environment](#setting-up-a-dev-environment) below). Alternatively, you
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can use <https://develop.element.io> - the continuous integration release of
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the develop branch.
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1. Configure the app by copying `config.sample.json` to `config.json` and
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modifying it. See the [configuration docs](docs/config.md) for details.
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1. `yarn dist` to build a tarball to deploy. Untaring this file will give
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a version-specific directory containing all the files that need to go on your
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web server.
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Note that `yarn dist` is not supported on Windows, so Windows users can run `yarn build`,
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which will build all the necessary files into the `webapp` directory. The version of Element
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will not appear in Settings without using the dist script. You can then mount the
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`webapp` directory on your web server to actually serve up the app, which is
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entirely static content.
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# Running as a Desktop app
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Element can also be run as a desktop app, wrapped in Electron. You can download a
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pre-built version from <https://element.io/get-started> or, if you prefer,
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build it yourself.
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To build it yourself, follow the instructions at <https://github.com/element-hq/element-desktop>.
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Many thanks to @aviraldg for the initial work on the Electron integration.
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The [configuration docs](docs/config.md#desktop-app-configuration) show how to override the desktop app's default settings if desired.
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# config.json
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Element supports a variety of settings to configure default servers, behaviour, themes, etc.
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See the [configuration docs](docs/config.md) for more details.
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# Labs Features
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Some features of Element may be enabled by flags in the `Labs` section of the settings.
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Some of these features are described in [labs.md](https://github.com/element-hq/element-web/blob/develop/docs/labs.md).
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# Caching requirements
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Element requires the following URLs not to be cached, when/if you are serving Element from your own webserver:
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```
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/config.*.json
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/i18n
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/home
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/sites
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/index.html
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```
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We also recommend that you force browsers to re-validate any cached copy of Element on page load by configuring your
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webserver to return `Cache-Control: no-cache` for `/`. This ensures the browser will fetch a new version of Element on
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the next page load after it's been deployed. Note that this is already configured for you in the nginx config of our
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Dockerfile.
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# Development
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Before attempting to develop on Element you **must** read the [developer guide
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for `matrix-react-sdk`](https://github.com/matrix-org/matrix-react-sdk#developer-guide), which
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also defines the design, architecture and style for Element too.
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Read the [Choosing an issue](docs/choosing-an-issue.md) page for some guidance
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about where to start. Before starting work on a feature, it's best to ensure
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your plan aligns well with our vision for Element. Please chat with the team in
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[#element-dev:matrix.org](https://matrix.to/#/#element-dev:matrix.org) before
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you start so we can ensure it's something we'd be willing to merge.
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You should also familiarise yourself with the ["Here be Dragons" guide
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](https://docs.google.com/document/d/12jYzvkidrp1h7liEuLIe6BMdU0NUjndUYI971O06ooM)
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to the tame & not-so-tame dragons (gotchas) which exist in the codebase.
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The idea of Element is to be a relatively lightweight "skin" of customisations on
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top of the underlying `matrix-react-sdk`. `matrix-react-sdk` provides both the
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higher and lower level React components useful for building Matrix communication
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apps using React.
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Please note that Element is intended to run correctly without access to the public
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internet. So please don't depend on resources (JS libs, CSS, images, fonts)
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hosted by external CDNs or servers but instead please package all dependencies
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into Element itself.
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CSS hot-reload is available as an opt-in development feature. You can enable it
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by defining a `CSS_HOT_RELOAD` environment variable, in a `.env` file in the root
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of the repository. See `.env.example` for documentation and an example.
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# Setting up a dev environment
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Much of the functionality in Element is actually in the `matrix-react-sdk` and
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`matrix-js-sdk` modules. It is possible to set these up in a way that makes it
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easy to track the `develop` branches in git and to make local changes without
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having to manually rebuild each time.
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First clone and build `matrix-js-sdk`:
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```bash
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git clone https://github.com/matrix-org/matrix-js-sdk.git
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pushd matrix-js-sdk
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yarn link
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yarn install
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popd
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```
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Then similarly with `matrix-react-sdk`:
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```bash
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git clone https://github.com/matrix-org/matrix-react-sdk.git
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pushd matrix-react-sdk
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yarn link
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yarn link matrix-js-sdk
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yarn install
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popd
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```
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Clone the repo and switch to the `element-web` directory:
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```bash
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git clone https://github.com/element-hq/element-web.git
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cd element-web
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```
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Configure the app by copying `config.sample.json` to `config.json` and
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modifying it. See the [configuration docs](docs/config.md) for details.
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Finally, build and start Element itself:
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```bash
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yarn link matrix-js-sdk
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yarn link matrix-react-sdk
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yarn install
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yarn start
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```
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Wait a few seconds for the initial build to finish; you should see something like:
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```
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[element-js] <s> [webpack.Progress] 100%
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[element-js]
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[element-js] ℹ ｢wdm｣: 1840 modules
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[element-js] ℹ ｢wdm｣: Compiled successfully.
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```
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Remember, the command will not terminate since it runs the web server
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and rebuilds source files when they change. This development server also
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disables caching, so do NOT use it in production.
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Open <http://127.0.0.1:8080/> in your browser to see your newly built Element.
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**Note**: The build script uses inotify by default on Linux to monitor directories
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for changes. If the inotify limits are too low your build will fail silently or with
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`Error: EMFILE: too many open files`. To avoid these issues, we recommend a watch limit
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of at least `128M` and instance limit around `512`.
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You may be interested in issues [#15750](https://github.com/element-hq/element-web/issues/15750) and
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[#15774](https://github.com/element-hq/element-web/issues/15774) for further details.
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To set a new inotify watch and instance limit, execute:
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```
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sudo sysctl fs.inotify.max_user_watches=131072
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sudo sysctl fs.inotify.max_user_instances=512
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sudo sysctl -p
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```
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If you wish, you can make the new limits permanent, by executing:
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```
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echo fs.inotify.max_user_watches=131072 | sudo tee -a /etc/sysctl.conf
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echo fs.inotify.max_user_instances=512 | sudo tee -a /etc/sysctl.conf
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sudo sysctl -p
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```
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---
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When you make changes to `matrix-react-sdk` or `matrix-js-sdk` they should be
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automatically picked up by webpack and built.
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If any of these steps error with, `file table overflow`, you are probably on a mac
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which has a very low limit on max open files. Run `ulimit -Sn 1024` and try again.
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You'll need to do this in each new terminal you open before building Element.
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## Running the tests
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There are a number of application-level tests in the `tests` directory; these
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are designed to run with Jest and JSDOM. To run them
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```
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yarn test
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```
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### End-to-End tests
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See [matrix-react-sdk](https://github.com/matrix-org/matrix-react-sdk/#end-to-end-tests) for how to run the end-to-end tests.
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# Translations
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To add a new translation, head to the [translating doc](docs/translating.md).
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For a developer guide, see the [translating dev doc](docs/translating-dev.md).
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# Triaging issues
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Issues are triaged by community members and the Web App Team, following the [triage process](https://github.com/element-hq/element-meta/wiki/Triage-process).
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We use [issue labels](https://github.com/element-hq/element-meta/wiki/Issue-labelling) to sort all incoming issues.
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