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This is my attempt at creating a Matrix homeserver in Elixir.
Currently it is in a very early stage.
Some noteworthy contributions:
## Noteworthy contributions
* `lib/matrix_server/state_resolution.ex`: Implementation of version 2 of the Matrix state resolution algorithm.
* `lib/matrix_server/state_resolution/authorization.ex`: Implementation of authorization rules for the state resolution algorithm.
* `lib/matrix_server/room_server.ex`: A GenServer that holds and manages the state of a room.
Generate the server's ed25519 keys by executing `ssh-keygen -t ed25519 -f keys/id_ed25519 -N ""`
Dependencies:
## 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](https://matrix.org/docs/guides/implementing-stateres), [State Resolution: Reloaded](https://matrix.uhoreg.ca/stateres/reloaded.html) and [Room Version 2](https://spec.matrix.org/unstable/rooms/v2).
* Authorization rules [Room version 1](https://spec.matrix.org/unstable/rooms/v1/)
* Homeserver authentication using signing keys [4.1 Request Authentication](https://matrix.org/docs/spec/server_server/latest#request-authentication).
* Client authentication [5.1 Using access tokens](https://matrix.org/docs/spec/client_server/r0.6.1#using-access-tokens).
### Major nimplemented features
* Resolving server names (but works for local development) [3.1 Resolving server names](https://matrix.org/docs/spec/server_server/latest#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](https://matrix.org/docs/spec/server_server/latest#checks-performed-on-receipt-of-a-pdu)
* Federation of events