To integrate lex bot to website, you need to know about AWS Lex runtime API, AWS IAM and Cognito configuration. This is the most secure way to integrate bot to website.
Here are the steps to add lex bot to your website:
1. Create new identity pool
From the Amazon Cognito console, you choose Manage new identity pool, and then choose Create new identity pool. You provide a pool name (testPoolName), choose Enable access to unauthenticated identities, and then choose Create Pool. Note down the identity pool id.
2. Give lex bot access permission to the
identity pool
Go to IAM service. Select Roles. Look for Cognito_testPoolNameUnauth_Role. Click on Attach Policy. Search for AmazonLexRunBotsOnly and attach it.
3. Lex runtime call from website: Here is the sample code for the website
Fill in the identity pool id in the following code. To understand this code, you need to understand AWS Lex run time api.
<!DOCTYPE html>
<html>
<head>
<title>Amazon Lex for JavaScript - Sample Application (BookTrip)</title>
<script src="https://sdk.amazonaws.com/js/aws-sdk-2.41.0.min.js"></script>
<style language="text/css">
input#wisdom {
padding: 4px;
font-size: 1em;
width: 400px
}
input::placeholder {
color: #ccc;
font-style: italic;
}
p.userRequest {
margin: 4px;
padding: 4px 10px 4px 10px;
border-radius: 4px;
min-width: 50%;
max-width: 85%;
float: left;
background-color: #7d7;
}
p.lexResponse {
margin: 4px;
padding: 4px 10px 4px 10px;
border-radius: 4px;
text-align: right;
min-width: 50%;
max-width: 85%;
float: right;
background-color: #bbf;
font-style: italic;
}
p.lexError {
margin: 4px;
padding: 4px 10px 4px 10px;
border-radius: 4px;
text-align: right;
min-width: 50%;
max-width: 85%;
float: right;
background-color: #f77;
}
</style>
<body>
<h1 style="text-align: left">Amazon Lex - BookTrip</h1>
<p style="width: 400px">
This little chatbot shows how easy it is to incorporate
<a href="https://aws.amazon.com/lex/" title="Amazon Lex (product)" target="_new">Amazon Lex</a> into your web pages. Try it out.
</p>
<div id="conversation" style="width: 400px; height: 400px; border: 1px solid #ccc; background-color: #eee; padding: 4px; overflow: scroll"></div>
<form id="chatform" style="margin-top: 10px" onsubmit="return pushChat();">
<input type="text" id="wisdom" size="80" value="" placeholder="I need a hotel room">
</form>
<script type="text/javascript">
// set the focus to the input box
document.getElementById("wisdom").focus();
// Initialize the Amazon Cognito credentials provider
AWS.config.region = 'us-east-1'; // Region
AWS.config.credentials = new AWS.CognitoIdentityCredentials({
// Provide your Pool Id here
IdentityPoolId: 'us-east-1:XXXXX',
});
var lexruntime = new AWS.LexRuntime();
var lexUserId = 'chatbot-demo' + Date.now();
var sessionAttributes = {};
function pushChat() {
// if there is text to be sent...
var wisdomText = document.getElementById('wisdom');
if (wisdomText && wisdomText.value && wisdomText.value.trim().length > 0) {
// disable input to show we're sending it
var wisdom = wisdomText.value.trim();
wisdomText.value = '...';
wisdomText.locked = true;
// send it to the Lex runtime
var params = {
botAlias: '$LATEST',
botName: 'BookTrip',
inputText: wisdom,
userId: lexUserId,
sessionAttributes: sessionAttributes
};
showRequest(wisdom);
lexruntime.postText(params, function(err, data) {
if (err) {
console.log(err, err.stack);
showError('Error: ' + err.message + ' (see console for details)')
}
if (data) {
// capture the sessionAttributes for the next cycle
sessionAttributes = data.sessionAttributes;
// show response and/or error/dialog status
showResponse(data);
}
// re-enable input
wisdomText.value = '';
wisdomText.locked = false;
});
}
// we always cancel form submission
return false;
}
function showRequest(daText) {
var conversationDiv = document.getElementById('conversation');
var requestPara = document.createElement("P");
requestPara.className = 'userRequest';
requestPara.appendChild(document.createTextNode(daText));
conversationDiv.appendChild(requestPara);
conversationDiv.scrollTop = conversationDiv.scrollHeight;
}
function showError(daText) {
var conversationDiv = document.getElementById('conversation');
var errorPara = document.createElement("P");
errorPara.className = 'lexError';
errorPara.appendChild(document.createTextNode(daText));
conversationDiv.appendChild(errorPara);
conversationDiv.scrollTop = conversationDiv.scrollHeight;
}
function showResponse(lexResponse) {
var conversationDiv = document.getElementById('conversation');
var responsePara = document.createElement("P");
responsePara.className = 'lexResponse';
if (lexResponse.message) {
responsePara.appendChild(document.createTextNode(lexResponse.message));
responsePara.appendChild(document.createElement('br'));
}
if (lexResponse.dialogState === 'ReadyForFulfillment') {
responsePara.appendChild(document.createTextNode(
'Ready for fulfillment'));
// TODO: show slot values
} else {
responsePara.appendChild(document.createTextNode(
'(' + lexResponse.dialogState + ')'));
}
conversationDiv.appendChild(responsePara);
conversationDiv.scrollTop = conversationDiv.scrollHeight;
}
</script>
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