maxwell/matrix.nix

{ config, lib, pkgs, ... }:

let
  domain = "eurofusion.eu";
in

{
  ### Reverse proxy locations

  # Setup for well-known on the bare domain
  services.nginx.virtualHosts.${domain} =
    let
      client =
        { "m.homeserver"      =  { "base_url" = "https://${config.var.hostname}"; };
          "m.identity_server" =  { "base_url" = "https://matrix.org";  };
        };
      server = { "m.server" = "${config.var.hostname}:443"; };
    in
  {
    enableACME = true;
    forceSSL = true;

    # Needed for matrix federation
    locations."/.well-known/matrix/server".extraConfig = ''
      add_header Content-Type application/json;
      return 200 '${builtins.toJSON server}';
    '';

    # Needed for automatic homeserver
    # setup of matrix clients
    locations."/.well-known/matrix/client".extraConfig = ''
      add_header Content-Type application/json;
      add_header Access-Control-Allow-Origin *;
      return 200 '${builtins.toJSON client}';
    '';
  };

  # Forward matrix/admin API calls to synapse
  services.nginx.virtualHosts.${config.var.hostname} =
    { locations."/_matrix".proxyPass = "http://localhost:8448";
      locations."/_synapse".proxyPass = "http://localhost:8448";
    };


  ### Homeserver
  services.matrix-synapse.enable = true;
  services.matrix-synapse.settings = {
    server_name = domain;
    public_baseurl = "https://${config.var.hostname}/";

    # Bind on localhost and used a reverse proxy
    listeners = [
      { bind_addresses = [ "localhost" ];
        port = 8448;
        type = "http";
        tls  = false;
        resources = [
          { compress = true;  names = [ "client" ] ; }
          { compress = false; names = [ "federation" ]; }
        ];
        x_forwarded = true;
      }
    ];

    # Connect to Postrges
    database_type = "psycopg2";
    database_args =
      { user     = "matrix-synapse";
        database = "matrix-synapse";
      };

    # Make logging less verbose
    log_config = pkgs.writeText "synapse-log.yml" ''
       version: 1
       formatters:
         journal_fmt:
           format: '%(name)s: [%(request)s] %(message)s'
       filters:
         context:
           (): synapse.util.logcontext.LoggingContextFilter
           request: ""
       handlers:
         journal:
           class: systemd.journal.JournalHandler
           formatter: journal_fmt
           filters: [context]
           SYSLOG_IDENTIFIER: synapse
       root:
         level: WARN
         handlers: [journal]
       disable_existing_loggers: False
    '';

    allow_guest_access  = true;
    expire_access_token = true;
    event_cache_size    = "2K";
    max_upload_size     = "1000M";
    dynamic_thumbnails  = true;
  };

  # Secrets
  services.matrix-synapse.extraConfigFiles =
    [
      # Password reset via email
      # Note: can't be put here, see NixOS/nixpkgs#158605
      config.secrets.matrix.email.conf

      # Needed by the register_new_matrix_user script
      config.secrets.matrix.registration
    ];


  ### Database
  services.postgresql.enable = true;

  # Create databases on the first run
  services.postgresql.initialScript = pkgs.writeText "synapse-init.sql" ''
    CREATE ROLE "matrix-synapse" WITH LOGIN PASSWORD 'synapse';
    CREATE DATABASE "matrix-synapse" WITH OWNER "matrix-synapse"
      TEMPLATE template0
      LC_COLLATE = "C"
      LC_CTYPE = "C";

    CREATE ROLE "mautrix-whatsapp" WITH LOGIN PASSWORD 'whatsapp';
    CREATE DATABASE "mautrix-whatsapp" WITH OWNER "mautrix-whatsapp"
      TEMPLATE template0
      LC_COLLATE = "C"
      LC_CTYPE = "C";
  '';

  ### Whatsapp bridge

  # allow synapse to read the shared secrets
  users.users.matrix-synapse.extraGroups = [ "mautrix-whatsapp" ];

  # Allow olm for mautrix-whatsapp
  nixpkgs.config.permittedInsecurePackages = [ "olm-3.2.16" ];

  services.mautrix-whatsapp =
    {
      enable = true;
      serviceDependencies = [ "postgresql.service" ];
      settings.appservice =
        { database.type = "postgres";
          database.uri = "postgresql:///mautrix-whatsapp?host=/run/postgresql";
        };
      settings.bridge =
        { encryption =
            { allow = true;
              default = true;
              require = true;
            };
          permissions =
            { "eurofusion.eu" = "user";
              "@rnhmjoj:eurofusion.eu" = "admin";
            };
          relay.enabled = false;
          mute_bridging = true;
        };
    };

}