add: basic cloud function

Author: codediodeio

functions/index.js

@@ -1,8 +1,65 @@
 const functions = require('firebase-functions');
 
-// // Create and Deploy Your First Cloud Functions
-// // https://firebase.google.com/docs/functions/write-firebase-functions
-//
-// exports.helloWorld = functions.https.onRequest((request, response) => {
-//  response.send("Hello from Firebase!");
-// });
+const admin = require('firebase-admin');
+admin.initializeApp(functions.config().firebase);
+
+
+exports.dialogflowFirebaseFulfillment = functions.https.onRequest((req, res) => {
+
+    console.log('Request headers: ' + JSON.stringify(req.headers));
+    console.log('Request body: ' + JSON.stringify(req.body));
+    // An action is a string used to identify what needs to be done in fulfillment
+    let action = req.body.result.action; 
+    // Parameters are any entites that Dialogflow has extracted from the request.
+    const parameters = req.body.result.parameters; 
+
+    // Contexts are objects used to track and store conversation state
+    const inputContexts = req.body.result.contexts;
+
+    // Get the request source slack/facebook/et
+    const requestSource = (req.body.originalRequest) ? req.body.originalRequest.source : undefined;
+    
+
+    // Firestore database
+    const db = admin.firestore()
+
+
+    const actionHandlers = {
+
+        'phone.update': () => { 
+            const userRef = db.collection('users').doc('test-user');
+            const phoneNumber = parameters['phone-number'];
+
+            userRef.update({ phone: phoneNumber }).then(() => {
+
+                const data = formatResponse('No problem. Phone number is updated in Firestore!')
+                res.json(data)
+            })
+
+        },
+        'default': () => {
+            const data = formatResponse('Hi. I am the default response from the Cloud Function')
+        }
+
+    }
+
+    if (!actionHandlers[action]) {
+        action = 'default';
+    }
+
+    // Call the handler with action type
+    actionHandlers[action]();
+
+});
+
+
+function formatResponse(text) {
+    return {
+        speech: text,
+        displayText: text,
+        data: {},
+        contextOut: [],
+        source: '',
+        followupEvent: {}
+    }
+}