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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Serverless Allergy Checker</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style>
.dashboard-page {
padding-top: 50px;
display: none
}
.login-page {
width: 360px;
padding: 8% 0 0;
margin: auto;
}
.form {
position: relative;
z-index: 1;
background: #FFFFFF;
max-width: 360px;
margin: 10px;
padding: 10px ;
text-align: center;
box-shadow: 0 0 20px 0 rgba(0, 0, 0, 0.2), 0 5px 5px 0 rgba(0, 0, 0, 0.24);
}
.form input {
font-family: "Tahoma", sans-serif;
outline: 0;
background: #f2f2f2;
width: 100%;
border: 0;
margin: 0 0 15px;
padding: 15px;
box-sizing: border-box;
font-size: 14px;
}
.form button {
font-family: "Tahoma", sans-serif;
outline: 0;
background: #4CAF50;
width: 100%;
border: 0;
padding: 15px;
color: #FFFFFF;
font-size: 14px;
-webkit-transition: all 0.3 ease;
transition: all 0.3 ease;
cursor: pointer;
}
.form button:hover,.form button:active,.form button:focus {
background: #43A047;
}
.form .message {
margin: 15px 0 0;
color: #b3b3b3;
font-size: 12px;
}
.form .message a {
color: #4CAF50;
text-decoration: none;
}
.form .register-form {
display: none;
}
.container {
position: relative;
z-index: 1;
max-width: 300px;
margin: 0 auto;
}
.container:before, .container:after {
content: "";
display: block;
clear: both;
}
.container .info {
margin: 50px auto;
text-align: center;
}
.container .info h1 {
margin: 0 0 15px;
padding: 0;
font-size: 36px;
font-weight: 300;
color: #1a1a1a;
}
.container .info span {
color: #4d4d4d;
font-size: 12px;
}
.container .info span a {
color: #000000;
text-decoration: none;
}
.container .info span .fa {
color: #EF3B3A;
}
body {
background: #76b852; /* fallback for old browsers */
background: -webkit-linear-gradient(right, #76b852, #8DC26F);
background: -moz-linear-gradient(right, #76b852, #8DC26F);
background: -o-linear-gradient(right, #76b852, #8DC26F);
background: linear-gradient(to left, #76b852, #8DC26F);
font-family: "Roboto", sans-serif;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
table {
background-color: black;
}
th {
background-color: lightgray;
}
td {
background-color: white;
padding: 5px;
}
#audioRecdPanel {
float: right;
background-color: white;
}
.center
{
margin: 0 auto;
padding: 2px;
position: relative;
}
#pictureGrabber
{
width: 660;
height: 490;
top: 2%;
margin: 0 auto;
text-align: center;
}
.chatContainer
{
width: 50%;
height: 26%;
top: 23%;
margin: 0 auto;
position: relative;
background: white;
border: 1px solid black;
}
.chat
{
clear: both;
width: auto;
border: none;
padding: 2px;
background-color: white;
overflow: auto;
height: 81%;
}
.chat p
{
font-family: Arial;
font-size: 14px;
border-radius: 6px;
padding: 6px;
clear: both;
border: 1px solid navy;
margin-bottom: 3px;
margin-top: 3px;
}
.me
{
float: left;
background-color: #AABBFF;
margin-right: 20%;
}
.bot
{
float: right;
background-color: #EEEEEE;
margin-left: 20%;
}
#speechStatus
{
font-family: Arial;
font-size: 14px;
color: navy;
background-color: lightgray;
width: auto;
border-bottom: 1px solid black;
padding: 2px;
}
#video {
border: 1px solid black;
box-shadow: 2px 2px 3px black;
}
#photo {
border: 1px solid black;
box-shadow: 2px 2px 3px black;
}
#canvas {
display: none;
}
#camera {
display: none;
margin: 0 auto;
}
#output {
display: none;
margin: 0 auto;
}
html, body {
height: 100%;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.js"></script>
<script src="https://sdk.amazonaws.com/js/aws-sdk-2.117.0.js"></script>
<script>
// config variables
var ACCESS_KEY_ID = 'XXX';
var SECRET_ACCESS_KEY = 'YYY';
var S3_BUCKET_NAME = 'allergicpatients';
var REKOGNITION_FACE_COLLECTION_ID = 'allergicpatients';
var polly;
var lex;
var lexUserId = 'user' + Math.random();
var s3;
var bucketUrl;
var dynamoDb;
var dynamoDbDocClient;
var rekognition;
function initAWS(region) {
AWS.config.region = region;
AWS.config.accessKeyId = ACCESS_KEY_ID;
AWS.config.secretAccessKey = SECRET_ACCESS_KEY;
}
function initPolly(region) {
polly = new AWS.Polly({ region: region});
}
function initLex(region) {
lex = new AWS.LexRuntime({
region: region
});
}
function initS3(region, bucketName) {
s3 = new AWS.S3({
params: {Bucket: bucketName}
});
bucketUrl = s3.endpoint.href + bucketName;
console.log("S3 bucketUrl=" + bucketUrl);
}
function initDynamoDB(region) {
dynamoDB = new AWS.DynamoDB({ region: region});
dynamoDBDocClient = new AWS.DynamoDB.DocumentClient({service: dynamoDB});
}
function initRekognition(region) {
rekognition = new AWS.Rekognition({ region: region});
}
function playAudioFromUrl(url, finishHandler) {
setSpeechStatus('Speaking...');
var audio = new Audio(url);
audio.onended = function() {
if (finishHandler)
finishHandler();
}
audio.play();
}
function speak(txt, finishHandler) {
var params = {
OutputFormat: 'mp3',
Text: txt,
VoiceId: 'Joanna',
};
polly.synthesizeSpeech(params, function(err, data) {
if (err)
console.log(err, err.stack);
else {
var uInt8Array = new Uint8Array(data.AudioStream);
var arrayBuffer = uInt8Array.buffer;
var blob = new Blob([arrayBuffer]);
var url = URL.createObjectURL(blob);
playAudioFromUrl(url, finishHandler);
}
});
}
function savePatient(patient) {
var params = {
TableName : 'Patient',
Item: patient
};
dynamoDBDocClient.put(params, function(err, data) {
if (err)
console.log(err, err.stack);
else {
playChatResponse('Patient "' + patient.name + '" added successfully. What would you like to do ?', function () {
$("#output").hide();
startRecording();
});
}
});
}
function getPatient(id, handler) {
var params = {
TableName : 'Patient',
Key: {
patientId: id
}
};
dynamoDBDocClient.get(params, function(err, data) {
if (err)
console.log(err, err.stack);
else
handler(data.Item);
});
}
var patientToAdd;
var pictureMode = 'check';
function addPatientClicked(patient) {
patientToAdd = patient;
$("#camera").show();
$("#output").hide();
pictureMode = 'add';
//setTimeout(takePicture, 2000);
}
function addDummy() {
var pId = 'dummy';
addPatientClicked({ patientId: pId, name: pId, allergen: 'pennicilin'});
}
function checkPatientClicked() {
$("#camera").show();
$("#output").hide();
pictureMode = 'check';
//setTimeout(takePicture, 2000);
}
function handleCheckPatientResponse(patient) {
if (!patient) {
playChatResponse("Patient not found. What would like you to do ?", function () {
$("#output").hide();
startRecording();
});
}
else {
photo.setAttribute('src', patient.imageUrl);
var allergyMessage = 'has no allergy';
if (patient.allergen !== 'none')
allergyMessage = 'has allergy to "' + patient.allergen + '"';
var response = 'Patient "' + patient.name + '" ' + allergyMessage + '. What would you like to do ?';
playChatResponse(response, function () {
$("#output").hide();
startRecording();
});
}
}
function checkPatient(blob) {
var arrayBuffer;
var fileReader = new FileReader();
fileReader.onload = function() {
var arrayBuffer = this.result;
var params = {
CollectionId: REKOGNITION_FACE_COLLECTION_ID,
FaceMatchThreshold: 80,
Image: {
Bytes: arrayBuffer
},
MaxFaces: 1
};
rekognition.searchFacesByImage(params, function(err, data) {
if (err) console.log(err, err.stack); // an error occurred
else {
var patientId = '';
if (data.FaceMatches.length == 1)
patientId = data.FaceMatches[0].Face.ExternalImageId;
if (patientId == '')
playChatResponse("Patient not found. What whould like you to do ?",
function () {
$("#output").hide();
startRecording();
}
);
else
getPatient(patientId, handleCheckPatientResponse);
}
});
};
fileReader.readAsArrayBuffer(blob);
}
function uploadPatientPicture(fileName, imageBlob){
s3.upload({
Key: fileName,
Body: imageBlob,
ACL: 'public-read'
}, function(err, data) {
if (err) {
return alert('There was an error uploading your photo: ', err.message);
}
else {
var imageUrl = bucketUrl + "/" + fileName;
patientToAdd.imageUrl = imageUrl;
patientToAdd.s3File = fileName;
savePatient(patientToAdd);
}
});
}
var speechRecorder = {};
function stopRecording() {
speechRecorder.recorder.stop();
}
function startRecording() {
setSpeechStatus('Listening...');
speechRecorder.recorder.start();
setTimeout(stopRecording, 4000);
}
function playLexResponse(stream, finishHandler) {
var uInt8Array = new Uint8Array(stream);
var arrayBuffer = uInt8Array.buffer;
var blob = new Blob([arrayBuffer]);
var url = URL.createObjectURL(blob);
playAudioFromUrl(url, finishHandler);
}
function handleLexResponse(res) {
replaceChatAudioInputLine(res.inputTranscript);
if (res.dialogState !== 'ReadyForFulfillment') {
addChatBotResponse(res.message);
playLexResponse(res.audioStream, startRecording);
}
else {
if (res.intentName === 'CheckPatient') {
playChatResponse('OK. I will check the patient after taking the picture. Click video to take picture.', checkPatientClicked);
}
else if (res.intentName === 'AddPatient') {
playChatResponse('OK. I will add this patient after taking the picture. Click video to take picture.', function() {
addPatientClicked({ patientId: 'patient_' + Math.random(), name: res.slots.PatientName, allergen: res.slots.Allergen });
});
}
}
}
function sendAudioToLex(audioData) {
setSpeechStatus('Analyzing...');
addChatAudioInputLine();
var params = {
botAlias: '$LATEST',
botName: 'AllergyChecker',
contentType: 'audio/x-l16; sample-rate=16000',
userId: lexUserId,
accept: 'audio/mpeg',
inputStream: audioData
};
//params.inputStream = ...;
lex.postContent(params, function(err, data) {
if (err) {
alert("Can't send audio.");
startRecording();
} else {
handleLexResponse(data);
}
});
}
function reSample(audioBuffer, targetSampleRate, onComplete) {
var channel = audioBuffer.numberOfChannels;
var samples = audioBuffer.length * targetSampleRate / audioBuffer.sampleRate;
var offlineContext = new OfflineAudioContext(channel, samples, targetSampleRate);
var bufferSource = offlineContext.createBufferSource();
bufferSource.buffer = audioBuffer;
bufferSource.connect(offlineContext.destination);
bufferSource.start(0);
offlineContext.startRendering().then(function(renderedBuffer){
onComplete(renderedBuffer);
})
}
var SILENCE_THRESHOLD = 0.04;
function removeSilence(buffer) {
var l = buffer.length;
var nonSilenceStart = 0;
var nonSilenceEnd = l;
while (nonSilenceStart < l) {
if (Math.abs(buffer[nonSilenceStart]) > SILENCE_THRESHOLD)
break;
nonSilenceStart++;
}
while (nonSilenceEnd > nonSilenceStart) {
if (Math.abs(buffer[nonSilenceEnd]) > SILENCE_THRESHOLD)
break;
nonSilenceEnd--;
}
var retBuffer = buffer;
if (nonSilenceStart != 0 || nonSilenceEnd != l) {
retBuffer = buffer.subarray(nonSilenceStart, nonSilenceEnd);
}
return retBuffer;
}
function convertFloat32ToInt16(buffer) {
var l = buffer.length;
var buf = new Int16Array(l);
while (l--) {
buf[l] = Math.min(1, buffer[l]) * 0x7FFF;
}
return buf.buffer;
}
function initSpeechRecording() {
navigator.mediaDevices.getUserMedia({
audio: true
}).then(function onSuccess(stream) {
var data = [];
speechRecorder.recorder = new MediaRecorder(stream);
speechRecorder.audioContext = new AudioContext();
speechRecorder.recorder.ondataavailable = function(e) {
data.push(e.data);
};
speechRecorder.recorder.onerror = function(e) {
throw e.error || new Error(e.name);
}
speechRecorder.recorder.onstart = function(e) {
data = [];
}
speechRecorder.recorder.onstop = function(e) {
setSpeechStatus('Checking silence...');
var blobData = new Blob(data, {type: 'audio/x-l16'});
var reader = new FileReader();
reader.onload = function() {
speechRecorder.audioContext.decodeAudioData(reader.result, function(buffer) {
reSample(buffer, 16000, function(newBuffer) {
var trimmedBuffer = removeSilence(newBuffer.getChannelData(0));
if (trimmedBuffer.length > 0) // if its not fully silence, send to Lex
sendAudioToLex(convertFloat32ToInt16(trimmedBuffer));
else
startRecording();
});
});
};
reader.readAsArrayBuffer(blobData);
}
});
}
var lastAudioInputId = 0;
function addChatAudioInputLine() {
var row$ = $('<p id="audioInput' + ++lastAudioInputId + '" class="me">Audio input</p>');
$('#chat').append(row$);
$("#chat").scrollTop($("#chat")[0].scrollHeight);
}
function replaceChatAudioInputLine(txt) {
$('#audioInput' + lastAudioInputId).html(txt);
}
function addChatBotResponse(txt) {
var row$ = $('<p class="bot">' + (txt || ' ') + '</p>');
$('#chat').append(row$);
$("#chat").scrollTop($("#chat")[0].scrollHeight);
}
function playChatResponse(txt, callback) {
addChatBotResponse(txt);
speak(txt, callback);
}
function setSpeechStatus(txt) {
$('#speechStatus').html(txt);
}
var videoSource = null;
var video = null;
var canvas = null;
var photo = null;
var width = 0; // We will scale the photo width to this
var height = 0; // This will be computed based on the input stream
// |streaming| indicates whether or not we're currently streaming
// video from the camera. Obviously, we start at false.
var streaming = false;
function initImageCapture() {
videoSource = document.getElementById('videoSource');
video = document.getElementById('video');
canvas = document.getElementById('canvas');
photo = document.getElementById('photo');
var selectedStream = null;
var videoSourceOnChange = function () {
if (selectedStream) {
selectedStream.getTracks().forEach(function(track) {
track.stop();
});
}
var constraints = {
audio: false,
video: {
optional: [{
sourceId: videoSource.value
}]
}
};
navigator.mediaDevices.getUserMedia(constraints).then(function onSuccess(stream) {
selectedStream = stream;
video.srcObject = stream;
});
};
videoSource.onchange = videoSourceOnChange;
video.addEventListener('canplay', function(ev){
if (!streaming) {
//height = video.videoHeight / (video.videoWidth/width);
height = video.videoHeight;
width = video.videoWidth;
// Firefox currently has a bug where the height can't be read from
// the video, so we will make assumptions if this happens.
if (isNaN(height)) {
height = width / (4/3);
}
video.setAttribute('width', width);
video.setAttribute('height', height);
canvas.setAttribute('width', width);
canvas.setAttribute('height', height);
output.setAttribute('width', width);
output.setAttribute('height', height);
streaming = true;
}
}, false);
var backCameraIndex = -1;
navigator.mediaDevices.enumerateDevices().then(function (deviceInfos) {
for (var i = 0; i !== deviceInfos.length; ++i) {
var deviceInfo = deviceInfos[i];
if (deviceInfo.kind === 'videoinput') {
var option = document.createElement('option');
option.value = deviceInfo.deviceId;
option.text = deviceInfo.label || 'camera ' + (videoSource.length + 1);
if (option.text.indexOf('back') != -1 || option.text.indexOf('rear') != -1)
backCameraIndex = videoSource.childElementCount;
videoSource.appendChild(option);
}
}
}).then(function() {
if (backCameraIndex != -1) // prefer back camera on mobil devices
videoSource.selectedIndex = backCameraIndex;
}).then(videoSourceOnChange);
clearphoto();
}
// Fill the photo with an indication that none has been
// captured.
function clearphoto() {
var context = canvas.getContext('2d');
context.fillStyle = "#AAA";
context.fillRect(0, 0, canvas.width, canvas.height);
var data = canvas.toDataURL('image/png');
photo.setAttribute('src', data);
}
// Capture a photo by fetching the current contents of the video
// and drawing it into a canvas, then converting that to a PNG
// format data URL. By drawing it on an offscreen canvas and then
// drawing that to the screen, we can change its size and/or apply
// other changes before drawing it.
function takePicture() {
var context = canvas.getContext('2d');
if (width && height) {
canvas.width = width;
canvas.height = height;
context.drawImage(video, 0, 0, width, height);
var data = canvas.toDataURL('image/png');
photo.setAttribute('src', data);
$("#camera").hide();
$("#output").show();
canvas.toBlob(function (blob) {
if (pictureMode === 'add') {
var fileName = "patient_" + (100000 * Math.random()) + "_capture.png";
uploadPatientPicture(fileName, blob);
}
else {
playChatResponse('Checking patient, please wait...', function () {
checkPatient(blob);
});
}
});
} else {
clearphoto();
}
}
var userPool;
function initDashboard(region) {
$(".chatOuter").show();
$(".dashboard-page").show();
initAWS(region);
initPolly(region);
initLex(region);
initS3(region, S3_BUCKET_NAME);
initDynamoDB(region);
initRekognition(region);
initSpeechRecording();
playChatResponse('Welcome. You can "add" or "check" patients. What would you like to do ?', startRecording);
initImageCapture();
}
function initPage() {
initDashboard('us-east-1');
}
</script>
</head>
<body onload="initPage()">
<div class="center">
<div id="pictureGrabber">
<div id="camera">
<select id="videoSource"></select>
<p></p>
<video id="video" onclick="takePicture()">Video stream not available.</video>
</div>
<canvas id="canvas">
</canvas>
<div id="output">
<img id="photo" alt="The screen capture will appear in this box.">
</div>
<p></p>
</div>
<div class="chatContainer">
<div id="speechStatus"></div>
<div id="chat" class="chat"></div>
</div>
</div>
</body>
</html>