Add option to test locally with ngrok.

README.md

@@ -16,6 +16,7 @@
     * [Enabling Billing](#enabling-billing)
     * [Configuring Account Linking](#configuring-account-linking)
 * [Development](#development)
+    * [Testing locally with ngrok](#testing-locally-with-ngrok)
     * [Files](#files)
     * [i18n](#i18n)
 * [Running this Action](#running-this-action)
@@ -220,6 +221,21 @@ Function URL (factsAboutGoogle): https://us-central1-myprojectname-ab123.cloudfu
 
 ## Development
 
+#### Testing locally with ngrok
+You can test your changes in the local development environment by going through the following steps :
+1. Install the dev dependencies from `./functions/package.json`
+
+2. Open terminal and run `firebase functions:config:get > runtimeconfig.json`
+
+3. Open `./functions/config.js` and replace the values for the local config variables by the respective values from `runtimeconfig.js` file you obtained in step 2.
+
+4. Cd into `/functions` directory and run `export IS_LOCAL_DEV=true` in the terminal.
+
+5. From the same directory, run `npm run dev` in the terminal. Open another terminal from the same directory and run `npm run tunnel`.
+
+6. You can now use the link generated via ngrok for fulfillment in the Dialogflow console. A new link will be generated each time you close the ngrok terminal. You will need to change that in the Dialogflow console each time.
+
+
 #### Files
 1.  `./functions/index.js`
     + Add new handlers for intents, modify intent logic to customize the skill.

functions/config.js

@@ -1,8 +1,23 @@
 // Environment Variables
 const functions = require('firebase-functions');
 
-module.exports = {
-    SERVER_URL : functions.config().envariables.server_url,
-    CLIENT_ID : functions.config().envariables.clientid,
-    OAUTH_SERVICE_NAME : functions.config().envariables.oauth_service_name
-};
+let config_vars;
+
+// Manually provided configuration variables for local testing
+if(process.env.IS_LOCAL_DEV === "true") {
+	config_vars = {
+		SERVER_URL : "your-server-url",
+	    CLIENT_ID : "your-client-id",
+	    OAUTH_SERVICE_NAME : "your-oauth-service-name"
+	}
+}
+// Production configuration variables
+else {
+	config_vars = {
+		SERVER_URL : functions.config().envariables.server_url,
+	    CLIENT_ID : functions.config().envariables.clientid,
+	    OAUTH_SERVICE_NAME : functions.config().envariables.oauth_service_name
+	}
+}
+
+module.exports = config_vars;

functions/index.js

@@ -9,7 +9,6 @@ const {
   MediaObject,
 } = require('actions-on-google');
 const functions = require('firebase-functions');
-
 const helperFunctions = require('./helperFunctions');
 const envVariables = require('./config');
 const {
@@ -25,6 +24,14 @@ const app = dialogflow({
 const i18n = require('i18n');
 const moment = require('moment');
 
+// Express server for local testing running at PORT
+const express = require("express");
+const bodyParser = require("body-parser");
+const expressApp = express().use(bodyParser.json());
+const cors = require('cors');
+expressApp.use(cors());
+expressApp.post("/", app);
+
 i18n.configure({
   locales: ['en-US', 'pt-BR', 'hi-IN'],
   directory: __dirname + '/locales',
@@ -2239,5 +2246,12 @@ app.intent('Post Group Emoji Message Intent', async (conv, params) => {
 
 });
 
+// Run local server at PORT
+if (process.env.IS_LOCAL_DEV === "true") {
+  const PORT = 8000;
+  expressApp.listen(PORT, () =>
+    console.log(`*** SERVER RUNNING LOCALLY ON PORT ${PORT} ***`)
+  );
+}
 
 exports.dialogflowFirebaseFulfillment = functions.https.onRequest(app);