Add JWT secret parameter

matrix-module.nix

@@ -83,6 +83,12 @@ in {
         type = str;
         description = "OpenID issuer URL.";
       };
+
+      jwt-secret = mkOption {
+        type = nullOr str;
+        description = "JWT secret, for decoding requests";
+        default = null;
+      };
     };
   };
 
@@ -120,42 +126,10 @@ in {
           signing_key_path = "${cfg.state-directory}/secrets/signing.key";
           # Only to trigger the inclusion of oidc deps, actual config is elsewhere
           oidc_providers = [ ];
-          jwt_config = {
+          jwt_config = mkIf (cfg.openid.jwt-secret != null) {
             enabled = true;
             algorithm = "HS256";
-            secret = ''
+            secret = cfg.openid.jwt-secret;
-              -----BEGIN CERTIFICATE-----
-              MIIFUzCCAzugAwIBAgIRAMqfkfHyl07usDfXTfgi/OIwDQYJKoZIhvcNAQELBQAw
-              HTEbMBkGA1UEAwwSYXV0aGVudGlrIDIwMjMuOC4xMB4XDTIzMDgyOTE3MTU1NloX
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-              x/n6DjSsmSyVGwo0zeAXhIZl/XzZZpp//Lbn91aMqnVY0zoCjdSEhEpBGx/djdLI
-              jCunluN2DypxO3PVEWqIUvNhlv0XW9o=
-              -----END CERTIFICATE-----
-            '';
           };
           listeners = [{
             port = cfg.port;
@@ -173,7 +147,8 @@ in {
             args.database = "${cfg.state-directory}/database/data.db";
           };
         };
-        extras = [ "jwt" "url-preview" ];
+        extras = [ "url-preview" ]
+          ++ (optional (cfg.openid.jwt-secret != null) "jwt");
         extraConfigFiles = [ hostSecrets.matrixOpenIdConfig.target-file ];
         configureRedisLocally = true;
       };