feat(events-backend,events-node): add a parser option to events by content type

Signed-off-by: Rogerio Angeliski <angeliski@hotmail.com>

plugins/events-node/package.json

@@ -55,7 +55,9 @@
     "@backstage/backend-plugin-api": "workspace:^",
     "@backstage/errors": "workspace:^",
     "@backstage/types": "workspace:^",
+    "@types/express": "^4.17.6",
     "cross-fetch": "^4.0.0",
+    "express": "^4.17.1",
     "uri-template": "^2.0.0"
   },
   "devDependencies": {

plugins/events-node/report-alpha.api.md

@@ -7,10 +7,13 @@ import { EventBroker } from '@backstage/plugin-events-node';
 import { EventPublisher } from '@backstage/plugin-events-node';
 import { EventSubscriber } from '@backstage/plugin-events-node';
 import { ExtensionPoint } from '@backstage/backend-plugin-api';
+import { HttpBodyParserOptions } from '@backstage/plugin-events-node';
 import { HttpPostIngressOptions } from '@backstage/plugin-events-node';
 
 // @alpha (undocumented)
 export interface EventsExtensionPoint {
+  // (undocumented)
+  addHttpPostBodyParser(options: HttpBodyParserOptions): void;
   // (undocumented)
   addHttpPostIngress(options: HttpPostIngressOptions): void;
   // @deprecated (undocumented)

plugins/events-node/report.api.md

@@ -9,6 +9,7 @@ import { AuthService } from '@backstage/backend-plugin-api';
 import { DiscoveryService } from '@backstage/backend-plugin-api';
 import { LifecycleService } from '@backstage/backend-plugin-api';
 import { LoggerService } from '@backstage/backend-plugin-api';
+import { Request as Request_2 } from 'express';
 import { RootConfigService } from '@backstage/backend-plugin-api';
 import { ServiceFactory } from '@backstage/backend-plugin-api';
 import { ServiceRef } from '@backstage/backend-plugin-api';
@@ -111,6 +112,27 @@ export interface EventSubscriber {
   supportsEventTopics(): string[];
 }
 
+// @public (undocumented)
+export type HttpBodyParsed = {
+  bodyParsed: any;
+  bodyBuffer: Buffer;
+  encoding: string;
+};
+
+// @public (undocumented)
+export type HttpBodyParser = (
+  request: Request_2,
+  topic: string,
+) => Promise<HttpBodyParsed>;
+
+// @public (undocumented)
+export interface HttpBodyParserOptions {
+  // (undocumented)
+  contentType: string;
+  // (undocumented)
+  parser: HttpBodyParser;
+}
+
 // @public (undocumented)
 export interface HttpPostIngressOptions {
   // (undocumented)

plugins/events-node/src/api/http/HttpBodyParserOptions.ts

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2025 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { HttpBodyParser } from './body-parser';
+
+/**
+ * @public
+ */
+export interface HttpBodyParserOptions {
+  contentType: string;
+  parser: HttpBodyParser;
+}

plugins/events-node/src/api/http/body-parser/HttpBodyParser.ts

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2025 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Request } from 'express';
+/**
+ * @public
+ */
+export type HttpBodyParsed = {
+  bodyParsed: any;
+  bodyBuffer: Buffer;
+  encoding: string;
+};
+
+/**
+ * @public
+ */
+export type HttpBodyParser = (
+  request: Request,
+  topic: string,
+) => Promise<HttpBodyParsed>;

plugins/events-node/src/api/http/body-parser/index.ts

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2025 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export * from './HttpBodyParser';

plugins/events-node/src/api/http/index.ts

@@ -15,4 +15,6 @@
  */
 
 export type { HttpPostIngressOptions } from './HttpPostIngressOptions';
+export type { HttpBodyParserOptions } from './HttpBodyParserOptions';
 export * from './validation';
+export * from './body-parser';

plugins/events-node/src/extensions.ts

@@ -19,6 +19,7 @@ import {
   EventBroker,
   EventPublisher,
   EventSubscriber,
+  HttpBodyParserOptions,
   HttpPostIngressOptions,
 } from '@backstage/plugin-events-node';
 
@@ -46,6 +47,8 @@ export interface EventsExtensionPoint {
   ): void;
 
   addHttpPostIngress(options: HttpPostIngressOptions): void;
+
+  addHttpPostBodyParser(options: HttpBodyParserOptions): void;
 }
 
 /**