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# Matrix client and server setup
# Copyright (C) 2022-2023  Nguyễn Gia Phong
#
# This file is part of loang configuration.
#
# Loang configuration is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Loang configuration is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with loang configuration.  If not, see <https://www.gnu.org/licenses/>.

{ config, lib, pkgs, ... }:
let
  inherit (config.networking) domain;
  client = {
    "m.homeserver" = {
      base_url = "https://${domain}";
      server_name = domain;
    };
    "m.identity_server" = {
      base_url = ""; # disable
    };
  };
  server = {
    "m.server" = "${domain}:443"; # unify with client-server
  };
  workingDir = "/var/lib/dendrite"; # hardcoded in service
in {
  services = {
    dendrite = {
      enable = true;
      settings = {
        app_service_api.database.connection_string = "";
        federation_api.database.connection_string = "";
        global = {
          database = {
            connection_string = "postgres:///dendrite?host=/run/postgresql";
            max_open_conns = 90;
          };
          private_key = "${workingDir}/matrix_key.pem";
          server_name = domain;
          trusted_third_party_id_servers = [ ];
        };
        key_server.database.connection_string = "";
        media_api = {
          database.connection_string = "";
          max_file_size_bytes = 123456789;
        };
        mscs = {
          database.connection_string = "";
          mscs = [ "msc2946" ]; # spaces summary
        };
        room_server.database.connection_string = "";
        sync_api = {
          database.connection_string = "";
          search.enabled = true;
        };
        user_api = {
          account_database.connection_string = "";
          device_database.connection_string = "";
        };
      };
    };

    nginx.virtualHosts = {
      "${domain}".locations = {
        "= /.well-known/matrix/client" = {
          extraConfig = ''
            add_header Content-Type application/json;
            add_header Access-Control-Allow-Origin *;
          '';
          return = "200 '${builtins.toJSON client}'";
        };

        "= /.well-known/matrix/server" = {
          extraConfig = ''
            add_header Content-Type application/json;
            add_header Access-Control-Allow-Origin *;
          '';
          return = "200 '${builtins.toJSON server}'";
        };

        "/_matrix".proxyPass = let
          port = toString config.services.dendrite.httpPort;
        in "http://localhost:${port}";
      };

      "than.${domain}" = {
        enableACME = true;
        forceSSL = true;
        locations = let
          noCache = {
            extraConfig = ''
              add_header Cache-Control "no-cache";
            '';
          };
        in {
          "/index.html" = noCache;
          "/version" = noCache;
          "/config" = noCache;
        };
        root = pkgs.element-web.override {
          conf = {
            default_server_config = client;
            default_theme = "dark";
            features.feature_latex_maths = true;
            room_directory.servers = [ "loang.net" ];
          };
        };
      };
    };

    postgresql = {
      ensureDatabases = [ "dendrite" ];
      ensureUsers = [ {
        name = "dendrite";
        ensureDBOwnership = true;
      } ];
    };
    postgresqlBackup.databases = [ "dendrite" ];
  };

  systemd.services.dendrite.serviceConfig = {
    DynamicUser = lib.mkForce false;
    User = "dendrite";
    Group = "dendrite";
  };

  users = {
    users.dendrite = {
      isSystemUser = true;
      group = "dendrite";
      home = workingDir;
    };
    groups.dendrite = {};
  };
}