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index.js
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index.js
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var https = require('https');
var querystring = require('querystring');
var AWS = require('aws-sdk');
exports.handler = function(event, context, callback) {
// Uncomment when you need a real dump for testing vectors or debug
// console.info(JSON.stringify(event));
// Validate the recaptcha
var input_data = JSON.parse(event.body);
var postData = querystring.stringify({
secret: process.env.ReCaptchaSecret,
response: input_data['g-recaptcha-response'],
});
var options = {
hostname: 'www.google.com',
port: 443,
path: '/recaptcha/api/siteverify',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': Buffer.byteLength(postData),
},
};
var corsResponseHeaders = {
'Access-Control-Allow-Methods': 'DELETE,GET,HEAD,OPTIONS,PATCH,POST,PUT',
'Access-Control-Allow-Headers':
'Content-Type,Authorization,X-Amz-Date,X-Api-Key,X-Amz-Security-Token',
'Access-Control-Allow-Origin': '*', // Required for CORS support to work
'Access-Control-Allow-Credentials': true, // Required for cookies, authorization headers with HTTPS
};
var req = https.request(options, function(res) {
res.setEncoding('utf8');
res.on('data', function(chunk) {
var captchaResponse = JSON.parse(chunk);
if (captchaResponse.success) {
console.info('Succeed to validate reCAPTCHA: ', captchaResponse);
var sns = new AWS.SNS();
delete input_data['g-recaptcha-response'];
var message = '';
Object.keys(input_data).forEach(function(key) {
message += key + ':\n';
message += '\t' + input_data[key] + '\n\n';
});
var params = {
Message: message,
Subject: process.env.Subject,
TopicArn: process.env.ContactUsSNSTopic,
};
sns.publish(params, function(err, response) {
if (err) {
console.error('Failed to send SNS message: ', JSON.stringify(err));
callback(null, {
statusCode: '500',
headers: corsResponseHeaders,
body: JSON.stringify({ message: 'Cannot send email' }),
});
return;
}
console.info('Succeed to send SNS message: ', response);
callback(null, {
statusCode: '200',
headers: corsResponseHeaders,
body: JSON.stringify(response),
});
});
} else {
console.info('Failed to validate reCAPTCHA: ', captchaResponse);
callback(null, {
statusCode: '500',
headers: corsResponseHeaders,
body: JSON.stringify({ message: 'Invalid recaptcha' }),
});
}
});
});
req.on('error', function(e) {
console.info('Got error on calling Google for reCAPTCHA verification: ', e);
callback(null, {
statusCode: '500',
headers: corsResponseHeaders,
body: JSON.stringify({ message: e.message }),
});
});
// write data to request body
req.write(postData);
req.end();
};