Add node8 firebase snippets (#719)

* Add node8 firebase snippets

* Address sam's comments

* Add (unit) tests for Firebase snippets

* Move deps to devDeps

* Fix quotes

Author: Ace Nassri

functions/node8/index.js

@@ -123,3 +123,61 @@ exports.helloGCSGeneric = (data, context) => {
   console.log(`  Updated: ${file.updated}`);
 };
 // [END functions_helloworld_storage_generic_node8]
+
+// [START functions_firebase_rtdb_node8]
+/**
+ * Triggered by a change to a Firebase RTDB reference.
+ *
+ * @param {object} data The event payload.
+ * @param {object} context The event metadata.
+ */
+exports.helloRTDB = (data, context) => {
+  const triggerResource = context.resource;
+
+  console.log(`Function triggered by change to: ${triggerResource}`);
+  console.log(`Admin?: ${!!data.admin}`);
+  console.log(`Delta:`);
+  console.log(JSON.stringify(data.delta, null, 2));
+};
+// [END functions_firebase_rtdb_node8]
+
+// [START functions_firebase_firestore_node8]
+/**
+ * Triggered by a change to a Firestore document.
+ *
+ * @param {object} data The event payload.
+ * @param {object} context The event metadata.
+ */
+exports.helloFirestore = (data, context) => {
+  const triggerResource = context.resource;
+
+  console.log(`Function triggered by change to: ${triggerResource}`);
+
+  console.log(`\nOld value:`);
+  console.log(JSON.stringify(data.oldValue, null, 2));
+
+  console.log(`\nNew value:`);
+  console.log(JSON.stringify(data.value, null, 2));
+};
+// [END functions_firebase_firestore_node8]
+
+// [START functions_firebase_auth_node8]
+/**
+ * Triggered by creation or deletion of a Firebase Auth user object.
+ *
+ * @param {object} data The event payload.
+ * @param {object} context The event metadata.
+ */
+exports.helloAuth = (data, context) => {
+  try {
+    console.log(`Function triggered by creation or deletion of user: ${data.uid}`);
+    console.log(`Created at: ${data.metadata.createdAt}`);
+
+    if (data.email) {
+      console.log(`Email: ${data.email}`);
+    }
+  } catch (err) {
+    console.error(err);
+  }
+};
+// [END functions_firebase_auth_node8]

functions/node8/package.json

@@ -18,10 +18,10 @@
   "bugs": {
     "url": "https://github.com/GoogleCloudPlatform/nodejs-docs-samples/issues"
   },
-  "dependencies": {
-    "ava": "^0.25.0"
-  },
   "devDependencies": {
-    "semistandard": "^12.0.1"
+    "@google-cloud/nodejs-repo-tools": "^2.3.3",
+    "ava": "^0.25.0",
+    "semistandard": "^12.0.1",
+    "uuid": "^3.3.2"
   }
 }

functions/node8/test/index.test.js

@@ -0,0 +1,84 @@
+/**
+ * Copyright 2018, 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
+ *
+ *    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.
+ */
+
+'use strict';
+
+const uuid = require('uuid');
+const test = require('ava');
+const utils = require('@google-cloud/nodejs-repo-tools');
+
+const program = require('../');
+
+test.beforeEach(utils.stubConsole);
+test.afterEach.always(utils.restoreConsole);
+
+test.serial('should monitor Firebase RTDB', t => {
+  const dataId = uuid.v4();
+  const resourceId = uuid.v4();
+
+  const data = {
+    admin: true,
+    delta: {
+      id: dataId
+    }
+  };
+  const context = {
+    resource: resourceId
+  };
+
+  program.helloRTDB(data, context);
+
+  t.true(console.log.firstCall.args[0].includes(resourceId));
+  t.deepEqual(console.log.secondCall.args, ['Admin?: true']);
+  t.true(console.log.getCall(3).args[0].includes(dataId));
+});
+
+test.serial('should monitor Firestore', t => {
+  const resourceId = uuid.v4();
+
+  const context = {
+    resource: resourceId
+  };
+  const data = {
+    oldValue: { uuid: uuid.v4() },
+    value: { uuid: uuid.v4() }
+  };
+
+  program.helloFirestore(data, context);
+
+  t.true(console.log.firstCall.args[0].includes(resourceId));
+  t.true(console.log.calledWith(JSON.stringify(data.oldValue, null, 2)));
+  t.true(console.log.calledWith(JSON.stringify(data.value, null, 2)));
+});
+
+test.serial('should monitor Auth', t => {
+  const userId = uuid.v4();
+  const dateString = (new Date()).toISOString();
+  const emailString = `${uuid.v4()}@${uuid.v4()}.com`;
+
+  const data = {
+    uid: userId,
+    metadata: {
+      createdAt: dateString
+    },
+    email: emailString
+  };
+
+  program.helloAuth(data, null);
+
+  t.true(console.log.firstCall.args[0].includes(userId));
+  t.true(console.log.secondCall.args[0].includes(dateString));
+  t.true(console.log.thirdCall.args[0].includes(emailString));
+});