Added voice output using amazon polly

Backend/Node/package.json

@@ -12,20 +12,21 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "actions-on-google": "^2.6.0",
+    "aws-sdk": "^2.1231.0",
     "bcryptjs": "^2.4.3",
     "body-parser": "^1.19.0",
     "config": "^3.3.6",
     "cors": "^2.8.5",
+    "dialogflow": "^0.10.2",
+    "dialogflow-fulfillment": "^0.6.1",
     "dotenv": "^10.0.0",
     "express": "^4.17.1",
     "jsonwebtoken": "^8.5.1",
     "lodash": "^4.17.21",
     "mongoose": "^6.0.8",
     "nodeJS": "^1.0.0",
-    "nodemon": "^2.0.13",
-    "actions-on-google": "^2.6.0",
-    "dialogflow": "^0.10.2",
-    "dialogflow-fulfillment": "^0.6.1"
+    "nodemon": "^2.0.13"
   },
   "devDependencies": {
     "formidable": "^1.2.2",

Backend/Node/src/routes/digitalHuman/dialogFlow.js

 const express = require('express');
 const router = express.Router();
 const dialogflow = require('dialogflow');
+const AWS = require('aws-sdk');
 fs = require('fs');
 const config = require('../../config/digitalHuman/config');
 
@@ -8,7 +9,16 @@ const projectId = config.googleProjectID
 const sessionId = config.dialogFlowSessionID
 const languageCode = config.dialogFlowSessionLanguageCode
 
-const credentials={
+// Credentials for Amazon Polly
+
+const Polly = new AWS.Polly({
+    region: 'us-west-2',
+    accessKeyId: 'AKIAWJCX4TSYJQYA5O5H',
+    secretAccessKey: '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'
+})
+
+// Credentials for dialogflow
+const credentials = {
     client_email: config.googleClientEmail,
     private_key: config.googlePrivateKey
 }
@@ -39,14 +49,38 @@ router.post('/textQuery', async (req, res) => {
     console.log(`  Query: ${result.queryText}`);
     console.log(`  Response: ${result.fulfillmentText}`);
 
-    fs.writeFile('output.txt', result.fulfillmentText , function (err,data) {
+    // voice initialization 
+    const voice = {
+        Text: result.fulfillmentText,
+        OutputFormat: "mp3",
+        VoiceId: "Joanna"
+    }
+
+    // Generating wav output
+    Polly.synthesizeSpeech(voice, (err, data) => {
+        if (err) {
+            console.log(err)
+            return
+        }
+        if (data.AudioStream instanceof Buffer) {
+            fs.writeFile('voice_output.wav', data.AudioStream, (err) => {
+                if (err) {
+                    console.error(err)
+                    return
+                }
+                console.log('Respond converted into wav file')
+            })
+        }
+    }
+    )
+
+    //output as a text
+    fs.writeFile('output.txt', result.fulfillmentText, function (err, data) {
         if (err) {
             return console.log(err);
         }
-        console.log(data);
+        console.log('Respond converted into text file')
     });
-    
-
     res.send(result)
 })
 
@@ -73,6 +107,7 @@ router.post('/eventQuery', async (req, res) => {
     console.log(`  Response: ${result.fulfillmentText}`);
 
     res.send(result)
-})
+}
+)
 
 module.exports = router;