Architex

A Matrix homeserver written in Elixir. Currently, this project is in a very early stage.

Noteworthy contributions

• lib/architex/state_resolution.ex: Implementation of version 2 of the Matrix state resolution algorithm.
• lib/architex/state_resolution/authorization.ex: Implementation of authorization rules for the state resolution algorithm.
• lib/architex/room_server.ex: A GenServer that holds and manages the state of a room.

Dependencies

• Elixir 1.12.2 compiled for OTP 24
• Erlang 24.0.3
• PostgreSQL
• Libsodium

Generate the server's ed25519 keys by executing ssh-keygen -t ed25519 -f keys/id_ed25519 -N ""

Progress

Here, implemented and some unimplemented features are listed.

TODO: list implemented endpoints

Implemented

• State resolution: functional, but very memory-intensive and with high database usage. For now it is sufficient, but snapshots should be used in the future. See: State Resolution v2 for the Hopelessly Unmathematical, State Resolution: Reloaded and Room Version 2.
• Authorization rules (Room version 1)
• Homeserver authentication using signing keys (4.1 Request Authentication)
• Client authentication (5.1 Using access tokens)

Major unimplemented features

• Resolving server names (but works for local development) (3.1 Resolving server names)
• Checks when receiving events via federation (i.e. valid format, signature check and hash check) (6.1 Checks performed on receipt of a PDU)
• Federation of events