Implement synapse-http-antispam /ping. (#897)

maunium/synapse-http-antispam@2a36ef3

Author: Gnuxie

CHANGELOG.md

@@ -12,6 +12,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased] - 2025-XX-XX
+
+### Added
+
+- Implemented `/ping` for
+  [synapse-http-antispam](https://the-draupnir-project.github.io/draupnir-documentation/bot/synapse-http-antispam).
+  It is now possible to check if synapse is misconfigured by searching for
+  `Successfully pinged antispam server with request ID` in any worker log.
+
 ## [v2.3.1] - 2025-05-29
 
 ### Fixed

mx-tester.yml

@@ -46,6 +46,7 @@ modules:
       config:
         base_url: http://host.docker.internal:8082/api/1/spam_check
         authorization: DEFAULT
+        do_ping: true
         enabled_callbacks:
           - user_may_invite
           - user_may_join_room

src/webapis/SynapseHTTPAntispam/PingEndpoint.ts

@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: 2025 Gnuxie <[email protected]>
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// SPDX-FileAttributionText: <text>
+// This modified file incorporates work from Draupnir
+// https://github.com/the-draupnir-project/Draupnir
+// </text>
+
+import { Type } from "@sinclair/typebox";
+import { Request, Response } from "express";
+import { isError, Logger, Value } from "matrix-protection-suite";
+
+const log = new Logger("PingEndpoint");
+
+const PingBody = Type.Object({
+  id: Type.Unknown(),
+});
+
+export function handleHttpAntispamPing(
+  request: Request,
+  response: Response
+): void {
+  const decodedBody = Value.Decode(PingBody, request.body);
+  if (isError(decodedBody)) {
+    log.error("Error decoding request body:", decodedBody.error);
+    response.status(400).send({
+      errcode: "M_INVALID_PARAM",
+      error: "Error decoding request body",
+    });
+    return;
+  }
+  response.status(200).send({
+    id: decodedBody.ok.id,
+    status: "ok",
+  });
+}

src/webapis/SynapseHTTPAntispam/SynapseHttpAntispam.ts

@@ -16,6 +16,7 @@ import {
   CheckEventForSpamEndpoint,
   CheckEventForSpamListenerArguments,
 } from "./CheckEventForSpamEndpoint";
+import { handleHttpAntispamPing } from "./PingEndpoint";
 
 const SPAM_CHECK_PREFIX = "/api/1/spam_check";
 const AUTHORIZATION = new RegExp("Bearer (.*)");
@@ -81,5 +82,9 @@ export class SynapseHttpAntispam {
         );
       })
     );
+    webController.post(
+      `${SPAM_CHECK_PREFIX}/ping`,
+      makeAuthenticatedEndpointHandler(this.secret, handleHttpAntispamPing)
+    );
   }
 }