bicep/matrix: attempt to set up livekit

hosts/bicep/services/matrix/default.nix

@@ -7,6 +7,7 @@
     ./synapse-admin.nix
     ./element.nix
     ./coturn.nix
+    ./livekit.nix
     ./mjolnir.nix
     ./well-known.nix
 

hosts/bicep/services/matrix/livekit.nix

@@ -0,0 +1,67 @@
+{ config, lib, fp, ... }:
+let
+  synapseConfig = config.services.matrix-synapse-next;
+  matrixDomain = "matrix.pvv.ntnu.no";
+  cfg = config.services.livekit;
+in
+{
+  sops.secrets."matrix/livekit/keyfile/lk-jwt-service" = {
+    sopsFile = fp /secrets/bicep/matrix.yaml;
+    key = "livekit/keyfile/lk-jwt-service";
+  };
+  sops.templates."matrix-livekit-keyfile" = {
+    restartUnits = [
+      "livekit.service"
+      "lk-jwt-service.service"
+    ];
+    content = ''
+      lk-jwt-service: ${config.sops.placeholder."matrix/livekit/keyfile/lk-jwt-service"}
+    '';
+  };
+
+  services.pvv-matrix-well-known.client = lib.mkIf cfg.enable {
+    "org.matrix.msc4143.rtc_foci" = [{
+      type = "livekit";
+      livekit_service_url = "https://${matrixDomain}/livekit/jwt";
+    }];
+  };
+
+  services.livekit = {
+    enable = true;
+    openFirewall = true;
+    keyFile = config.sops.templates."matrix-livekit-keyfile".path;
+
+    # NOTE: needed for ingress/egress workers
+    # redis.createLocally = true;
+
+    # settings.room.auto_create = false;
+  };
+
+  services.lk-jwt-service = lib.mkIf cfg.enable {
+    enable = true;
+    livekitUrl = "wss://${matrixDomain}/livekit/sfu";
+    keyFile = config.sops.templates."matrix-livekit-keyfile".path;
+  };
+
+  systemd.services.lk-jwt-service.environment.LIVEKIT_FULL_ACCESS_HOMESERVERS = lib.mkIf cfg.enable matrixDomain;
+
+  services.nginx.virtualHosts.${matrixDomain} = lib.mkIf cfg.enable {
+    locations."^~ /livekit/jwt/" = {
+      proxyPass = "http://localhost:${toString config.services.lk-jwt-service.port}/";
+    };
+
+    # TODO: load balance to multiple livekit ingress/egress workers
+    locations."^~ /livekit/sfu/" = {
+      proxyPass = "http://localhost:${toString config.services.livekit.settings.port}/";
+      proxyWebsockets = true;
+      extraConfig = ''
+        proxy_send_timeout 120;
+        proxy_read_timeout 120;
+        proxy_buffering off;
+        proxy_set_header Accept-Encoding gzip;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+      '';
+    };
+  };
+}