Added a sample for custom events

2nd-gen/custom-events/firebase.json

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+{
+ "functions": {
+ "predeploy": [
+ "npm --prefix \"$RESOURCE_DIR\" run lint"
+ ]
+ }
+}

2nd-gen/custom-events/functions/ README.md

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+Firebase Custom Events sample
+================================================
+
+A custom event trigger function that handles `firebase.extensions.storage-resize-images.v1.complete` and adds custom workflow.
+
+
+Getting Started
+---------------
+
+1. Install the [Resize Images
+](https://firebase.google.com/products/extensions/firebase-storage-resize-images)
+1. Install dependencies with `npm install` and deploy with `firebase deploy --only functions`
+1. Upload a test image to the storage bucket configured for the extension.
+
+License
+-------
+
+© Google, 2022. Licensed under an [Apache-2](../../../LICENSE) license.

2nd-gen/custom-events/functions/.eslintrc.js

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+module.exports = {
+ root: true,
+ env: {
+ es6: true,
+ node: true,
+ },
+ extends: [
+ "eslint:recommended",
+ "google",
+ ],
+ rules: {
+ quotes: ["error", "double"],
+ },
+};

2nd-gen/custom-events/functions/index.js

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+/**
+ * Copyright 2022 Google LLC
+ *
+ * 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
+ *
+ * https://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.
+ */
+
+// [START import]
+const {onCustomEventPublished} = require("firebase-functions/v2/eventarc");
+const logger = require("firebase-functions/logger");
+const { initializeApp } = require('firebase-admin/app');
+const { getStorage } = require('firebase-admin/storage');
+// [END import]
+
+initializeApp();
+
+// [START imageresizedEvent]
+exports.onimageresized = onCustomEventPublished(
+ "firebase.extensions.storage-resize-images.v1.complete",
+ (event) => {
+ logger.info("Received image resize completed event", event);
+ // For example, delete the original.
+ return getStorage()
+ .bucket("my-project.appspot.com")
+ .file(event.subject)
+ .delete();
+ });
+// [END imageresizedEvent]

2nd-gen/custom-events/functions/package.json

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+{
+ "name": "functions-custom-events",
+ "description": "Custom event handler for Image Resizer extension.",
+ "scripts": {
+ "lint": "eslint .",
+ "lint:fix": "eslint . --fix",
+ "serve": "firebase emulators:start --only functions",
+ "shell": "firebase functions:shell",
+ "start": "npm run shell",
+ "deploy": "firebase deploy --only functions",
+ "logs": "firebase functions:log"
+ },
+ "engines": {
+ "node": "16"
+ },
+ "main": "index.js",
+ "dependencies": {
+ "firebase-admin": "^10.0.0",
+ "firebase-functions": "^3.20.1"
+ },
+ "devDependencies": {
+ "eslint": "^8.9.0",
+ "eslint-config-google": "^0.14.0"
+ },
+ "private": true
+}