Matrix Public Archive

NB: This project is very much a work-in-progress (WIP)! Undocumented config/secrets, using a draft branch of Hydrogen, etc.

In the vein of feature parity with Gitter, the goal is to make a public archive site for world_readable Matrix rooms like Gitter's archives which search engines can index and keep all of the content accessible/available. There is already https://view.matrix.org/ (https://github.com/matrix-org/matrix-static) but there is some desire to make something with more Element-feeling polish and loading faster (avoid the slow 502's errors that are frequent on view.matrix.org).

Plan summary

The plan is to server-side render (SSR) the Hydrogen Matrix client on a Node.js server (since both use JavaScript) and serve pages on the fly (probably with some Cloudflare caching on top) when someone requests /archives/${year}/${month}/${day}. To fetch the events for a given day/time, we will use MSC3030's /timestamp_to_event endpoint to jump to a given day in the timeline and fetch the messages from a Matrix homeserver.

Re-using Hydrogen gets us pretty and native(to Element) looking styles and keeps the maintenance burden of supporting more event types in Hydrogen.

Setup

Prerequisites

• Node.js v16
  • We only need v16 because it includes require('crypto').webcrypto.subtle for Matrix encryption (olm) which can't be disabled in Hydrogen yet.
• A Matrix homeserver that supports MSC3030's /timestamp_to_event endpoint
  • Currently, the only implementation is in Synapse under an experimental feature flag. Adjust your homeserver config to enable it: homeserver.yaml

    experimental_features:
      msc3030_enabled: true

  • The /timestamp_to_event endpoint will soon be stabilized in Synapse which means it will be available without the feature flag. You can track progress at matrix-org/synapse#14390

Get the app running

$ npm install

# Edit `config/config.user-overrides.json` so that `matrixServerUrl` points to
# your homeserver and has `matrixAccessToken` defined
$ cp config/config.default.json config/config.user-overrides.json

$ npm run start
# To enable tracing, add the `--tracing` flag
$ npm run start -- --tracing

Development

# Clone and install the `matrix-public-archive` project
$ git clone git@github.com:matrix-org/matrix-public-archive.git
$ cd matrix-public-archive
$ npm install

# Edit `config/config.user-overrides.json` so that `matrixServerUrl` points to
# your homeserver and has `matrixAccessToken` defined
$ cp config/config.default.json config/config.user-overrides.json

# This will watch for changes, rebuild bundles and restart the server
$ npm run start-dev
# To enable tracing, add the `--tracing` flag
$ npm run start-dev -- --tracing

If you want to make changes to the underlying Hydrogen SDK as well, you can locally link it into this project with the following instructions:

# We need to use a draft branch of Hydrogen to get the custom changes needed for
# `matrix-public-archive` to run. Hopefully soon, we can get all of the custom
# changes mainlined so this isn't necessary.
$ git clone git@github.com:vector-im/hydrogen-web.git
$ cd hydrogen-web
$ git checkout madlittlemods/matrix-public-archive-scratch-changes
$ yarn install
$ yarn build:sdk
$ cd target/ && npm link && cd ..
$ cd ..

$ cd matrix-public-archive
$ npm link hydrogen-view-sdk

Running tests

See the testing readme.