bicep/matrix: add module for adding stuff to well-known

hosts/bicep/services/matrix/well-known.nix

@@ -0,0 +1,44 @@
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.services.pvv-matrix-well-known;
+  format = pkgs.formats.json { };
+  matrixDomain = "matrix.pvv.ntnu.no";
+in
+{
+  options.services.pvv-matrix-well-known = {
+    client = lib.mkOption {
+      type = lib.types.submodule { freeformType = format.type; };
+      default = { };
+      example = {
+        "m.homeserver".base_url = "https://${matrixDomain}/";
+      };
+    };
+
+    server = lib.mkOption {
+      type = lib.types.submodule { freeformType = format.type; };
+      default = { };
+      example = {
+        "m.server" = "https://${matrixDomain}/";
+      };
+    };
+  };
+
+  config = {
+    services.nginx.virtualHosts.${matrixDomain} = {
+      locations."= /.well-known/matrix/client" = lib.mkIf (cfg.client != { }) {
+        alias = format.generate "nginx-well-known-matrix-server.json" cfg.client;
+        extraConfig = ''
+          default_type application/json;
+          add_header Access-Control-Allow-Origin *;
+        '';
+      };
+      locations."= /.well-known/matrix/server" = lib.mkIf (cfg.server != { }) {
+        alias = format.generate "nginx-well-known-matrix-server.json" cfg.server;
+        extraConfig = ''
+          default_type application/json;
+          add_header Access-Control-Allow-Origin *;
+        '';
+      };
+    };
+  };
+}