Sovran_SystemsOS/modules/synapse.nix

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

lib.mkIf config.sovran_systemsOS.services.synapse {

  # ── PostgreSQL database for Matrix ──────────────────────────
  services.postgresql = {
    enable = true;
    ensureDatabases = [ "matrix-synapse" ];
    ensureUsers = [
      {
        name = "matrix-synapse";
        ensureDBOwnership = true;
      }
    ];
  };

  # ── Auto-generate DB password and initialize ────────────────
  systemd.services.matrix-synapse-db-init = {
    description = "Initialize Matrix Synapse PostgreSQL database with auto-generated password";
    after = [ "postgresql.service" ];
    requires = [ "postgresql.service" ];
    before = [ "matrix-synapse.service" ];
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = true;
    };
    path = [ config.services.postgresql.package pkgs.pwgen pkgs.coreutils ];
    script = ''
      set -euo pipefail

      SECRET_DIR="/var/lib/secrets"
      SECRET_FILE="$SECRET_DIR/matrix_db_secret"

      mkdir -p "$SECRET_DIR"

      if [ ! -f "$SECRET_FILE" ]; then
        pwgen -s 64 1 > "$SECRET_FILE"
        chmod 600 "$SECRET_FILE"
        chown matrix-synapse:matrix-synapse "$SECRET_FILE"
      fi

      DB_PASS=$(cat "$SECRET_FILE")

      psql -U postgres -c "ALTER ROLE \"matrix-synapse\" WITH LOGIN PASSWORD '$DB_PASS';"

      if ! psql -U postgres -lqt | cut -d \| -f 1 | grep -qw "matrix-synapse"; then
        psql -U postgres -c "CREATE DATABASE \"matrix-synapse\" WITH OWNER \"matrix-synapse\" TEMPLATE template0 LC_COLLATE = 'C' LC_CTYPE = 'C';"
      fi
    '';
  };

  # ── Generate Synapse runtime config from domain files ───────
  systemd.services.matrix-synapse-runtime-config = {
    description = "Generate Matrix Synapse runtime config from domain files";
    before = [ "matrix-synapse.service" ];
    after = [ "matrix-synapse-db-init.service" ];
    requiredBy = [ "matrix-synapse.service" ];
    wantedBy = [ "multi-user.target" ];
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = true;
    };
    path = [ pkgs.coreutils ];
    script = ''
      set -euo pipefail

      MATRIX=$(cat /var/lib/domains/matrix)
      RUNTIME_DIR="/run/matrix-synapse"
      mkdir -p "$RUNTIME_DIR"

      # Include TURN config if coturn secret exists (deployed machines)
      if [ -f /var/lib/secrets/coturn_static_auth_secret ]; then
        COTURN_SECRET=$(cat /var/lib/secrets/coturn_static_auth_secret)
        cat > "$RUNTIME_DIR/runtime-config.yaml" <<EOF
server_name: "$MATRIX"
turn_shared_secret: "$COTURN_SECRET"
turn_uris:
  - "turn:$MATRIX:5349?transport=udp"
  - "turn:$MATRIX:5349?transport=tcp"
EOF
      else
        cat > "$RUNTIME_DIR/runtime-config.yaml" <<EOF
server_name: "$MATRIX"
EOF
      fi

      chown matrix-synapse:matrix-synapse "$RUNTIME_DIR/runtime-config.yaml"
      chmod 640 "$RUNTIME_DIR/runtime-config.yaml"
    '';
  };

  # ── Synapse service ─────────────────────────────────────────
  services.matrix-synapse = {
    enable = true;
    extraConfigFiles = [ "/run/matrix-synapse/runtime-config.yaml" ];
    settings = {
      # server_name, turn_shared_secret, turn_uris injected at runtime
      push.include_content = false;
      group_unread_count_by_room = false;
      encryption_enabled_by_default_for_room_type = "invite";
      allow_profile_lookup_over_federation = false;
      allow_device_name_lookup_over_federation = false;
      url_preview_enabled = true;
      max_upload_size = "1024M";
      url_preview_ip_range_blacklist = [
        "10.0.0.0/8"
        "100.64.0.0/10"
        "169.254.0.0/16"
        "172.16.0.0/12"
        "192.0.0.0/24"
        "192.0.2.0/24"
        "192.168.0.0/16"
        "192.88.99.0/24"
        "198.18.0.0/15"
        "198.51.100.0/24"
        "2001:db8::/32"
        "203.0.113.0/24"
        "224.0.0.0/4"
        "::1/128"
        "fc00::/7"
        "fe80::/10"
        "fec0::/10"
        "ff00::/8"
      ];
      url_preview_ip_ranger_whitelist = [ "127.0.0.1" ];
      presence.enabled = true;
      enable_registration = false;
      registration_shared_secret = config.age.secrets.matrix_reg_secret.path;
      listeners = [
        {
          port = 8008;
          bind_addresses = [ "::1" ];
          type = "http";
          tls = false;
          x_forwarded = true;
          resources = [
            { names = [ "client" ]; compress = true; }
            { names = [ "federation" ]; compress = false; }
          ];
        }
      ];
    };
  };
  
  sovran_systemsOS.domainRequirements = [
    { name = "matrix"; label = "Matrix Synapse"; example = "matrix.yourdomain.com"; }
  ];
}