{ makeSystem
, nixpkgs

, commonConfig
}:
makeSystem {
  system = "x86_64-linux";
  name = "synapse";
  inherit nixpkgs;
  config =
    { pkgs, lib, ... }:
    let
      inherit (lib)
        singleton;
    in
    {
      dumb-init = {
        enable = true;
        type.services = { };
      };

      init.services.synapse = {
        enabled = true;
        shutdownOnExit = true;
        script =
          let
            synapseConfig = (pkgs.formats.yaml {}).generate "synapse.yaml"
              {
                listeners =
                  [
                    # The HTTP replication port
                    {
                      port = 9093;
                      bind_addresses = [ "0.0.0.0" ];
                      type = "http";
                      resources = [
                        {
                          names = [ "replication" ];
                        }
                      ];
                    }
                    {
                      port = 6167;
                      tls = false;
                      type = "http";
                      x_forwarded = true;
                      bind_adrresses = [ "0.0.0.0" ];
                      resources = singleton {
                        names = [ "client" "federation" ];
                        compress = false;
                      };
                    }
                  ];

                public_baseurl = "https://matrix.redalder.org/";

                # Add a random shared secret to authenticate traffic.
                worker_replication_secret = "";
              };
          in
            pkgs.writeShellScript "synapse" ''
              ${pkgs.matrix-synapse}/bin/synapse_homeserver \
                --config-path ${synapseConfig} \
                --config-path ${commonConfig pkgs} \
                --config-path /secrets/extra.yaml \
                --config-path /var/lib/registrations/extra.yaml \
                --keys-directory /var/lib/synapse/keys \
                $([ -e /var/lib/synapse/signing.key ] || echo --generate-keys)
            '';
      };
    };
}