feat: introduce singleton webhook URL

packages/backend/src/controllers/webhooks/handler-by-flow-id.ts

@@ -0,0 +1,34 @@
+import path from 'node:path';
+import { Response } from 'express';
+import { IRequest } from '@automatisch/types';
+
+import Step from '../../models/step';
+import logger from '../../helpers/logger';
+import handler from '../../helpers/webhook-handler';
+
+export default async (request: IRequest, response: Response) => {
+  const computedRequestPayload = {
+    headers: request.headers,
+    body: request.body,
+    query: request.query,
+    params: request.params,
+  };
+  logger.debug(`Handling incoming webhook request at ${request.originalUrl}.`);
+  logger.debug(JSON.stringify(computedRequestPayload, null, 2));
+
+  const flowId = request.params.flowId;
+  const triggerStep = await Step.query()
+    .findOne({
+      webhook_path: path.join(request.baseUrl, request.path),
+    })
+    .throwIfNotFound();
+  const connection = await triggerStep.$relatedQuery('connection');
+
+  if (!await connection.verifyWebhook(request)) {
+    return response.sendStatus(401);
+  }
+
+  await handler(flowId, request, response);
+
+  response.sendStatus(204);
+};