Add Signal and WhatsApp bridges for matrix-synapse

modules/services/matrix-synapse/default.nix

@@ -7,6 +7,10 @@
 
 let
   cfg = config.modules.services.matrix-synapse;
+  validBridges = [
+    "signal"
+    "whatsapp"
+  ];
 in {
   options.modules.services.matrix-synapse = {
     enable = lib.mkOption {
@@ -17,6 +21,16 @@ in {
       default = true;
       example = false;
     };
+    bridges = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      description = "A list of bridges to configure with Synapse.";
+      example = [ "signal" "whatsapp" ];
+      default = [];
+      apply = bridges:
+        if lib.all (bridge: lib.elem bridge validBridges) bridges
+        then bridges
+        else throw "Invalid bridge(s) specified. Valid bridges are: ${lib.concatStringsSep ", " validBridges}";
+    };
     serverName = lib.mkOption {
       type = lib.types.str;
       default = "vimium.com";
@@ -29,6 +43,27 @@ in {
   };
 
   config = let
+    commonBridgeSettings = bridge: {
+      appservice = {
+        database = lib.mkIf cfg.usePostgresql {
+          type = "postgres";
+          uri = "postgresql:///mautrix-${bridge}?host=/run/postgresql";
+        };
+      };
+      bridge = {
+        encryption = {
+          allow = true;
+          default = true;
+          require = true;
+        };
+        permissions = {
+          "${cfg.serverName}" = "user";
+        };
+        provisioning = {
+          shared_secret = "disable";
+        };
+      };
+    };
     matrixClientConfig = {
       "m.homeserver" = {
         base_url = "https://matrix.${cfg.serverName}";
@@ -149,5 +184,25 @@ in {
         "matrix-synapse"
       ];
     };
+
+    services.mautrix-signal = lib.mkIf (lib.elem "signal" cfg.bridges) {
+      enable = true;
+      settings = commonBridgeSettings "signal";
+    };
+
+    services.mautrix-whatsapp = lib.mkIf (lib.elem "whatsapp" cfg.bridges) {
+      enable = true;
+      settings = {
+        bridge = {
+          history_sync = {
+            backfill = true;
+            max_initial_conversations = -1;
+            message_count = 50;
+            request_full_sync = false;
+          };
+          mute_bridging = true;
+        };
+      } // commonBridgeSettings "whatsapp";
+    };
   };
 }