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handler.js
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"use strict";
const AWS = require('aws-sdk');
const serverless = require('serverless-http');
const WebPay = require('webpay-nodejs');
const express = require('express');
const bodyParser = require('body-parser');
const uuid = require('uuid');
const cert = require('./certificates');
const dynamoDb = new AWS.DynamoDB.DocumentClient();
const onError = function (err, res) {
console.log('ERROR', err)
res.send(`
<html>
<head><meta charset="utf-8"></head>
<body>
<h1>ERROR</h1>
<pre>
${err.stack}
</pre>
</body>
</html>
`)
};
let app = express();
app.use(bodyParser.urlencoded({ extended: true }));
let wp = new WebPay({
commerceCode: cert.commerceCode,
publicKey: cert.publicKey,
privateKey: cert.privateKey,
webpayKey: cert.webpayKey,
verbose: true,
env: WebPay.ENV.INTEGRACION
});
app.get('/', (req, res) => {
res.send(`
<!DOCTYPE html>
<html>
<head>
<title>Test webpay-nodejs</title>
</head>
<body>
<h1>Test webpay-nodejs</h1>
<form action="/dev/pagar" method="post">
<input type="number" min="10" placeholder="Monto a pagar" name="amount">
<input type="submit" value="Pagar">
</form>
</body>
</html>`);
});
app.post('/pagar', async (req, res) => {
// almacenar la fila en dynamo :: Este bloque no debe ir acá ::::::::::::::::::::::::::::::::::
let charge_id = uuid.v1();
let amount = req.body.amount;
try {
let result = await dynamoDb.put({
TableName: process.env.chargesTableName,
Item: {
charge_id: charge_id,
user_id: '1',
amount: amount,
created_at: Date.now()
}
}).promise();
} catch (e) {
res.send({ 'error': e })
}
// :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
try {
let payment_id = uuid.v1();
// ingresar el intento de pago
let paymentResult = await dynamoDb.put({
TableName: process.env.paymentsTableName,
Item: {
payment_id: payment_id,
charge_id: charge_id,
amount: amount,
created_at: Date.now(),
status: 'created'
}
}).promise();
// enviar peticion a webpay
let url = 'http://' + req.get('host');
let transaction = await wp.initTransaction({
buyOrder: payment_id.replace('-', '').substr(0, 26), // transbank max Length, posibilidades de hash collision?
sessionId: req.sessionId,
returnURL: url + '/dev/verificar?tid=' + payment_id + '&cid=' + charge_id,
finalURL: url + '/dev/comprobante?tid=' + payment_id + '&cid=' + charge_id,
amount: amount
});
// TODO :: no es mejor usar solo el put de arriba?
let updateResult = await dynamoDb.update({
TableName: process.env.paymentsTableName,
Key: {
payment_id: payment_id,
charge_id: charge_id
},
UpdateExpression: "SET token_ws_at = :tkd, token_ws = :tkval",
ExpressionAttributeValues: {
":tkd": Date.now(),
":tkval": transaction.token || null
},
ReturnValues: "ALL_NEW"
}).promise();
res.redirect(transaction.url + '?token_ws=' + transaction.token);
} catch (e) {
res.send({ 'error': e })
}
});
app.post('/verificar', async (req, res) => {
let payment_id = req.query.tid;
let charge_id = req.query.cid;
let token_ws = req.body.token_ws;
try {
let transactionResult = await wp.getTransactionResult(token_ws);
let acknowledge = await wp.acknowledgeTransaction(token_ws);
let updateResult = await dynamoDb.update({
TableName: process.env.paymentsTableName,
Key: {
payment_id: payment_id,
charge_id: charge_id
},
UpdateExpression: "SET transaction_result = :tr, acknoledge_result = :ar",
ExpressionAttributeValues: {
":tr": transactionResult,
":ar": acknowledge
},
ReturnValues: "ALL_NEW"
}).promise();
res.send(WebPay.getHtmlTransitionPage(transactionResult.urlRedirection, token_ws));
} catch (e) {
res.send({ 'error': e })
}
});
app.post('/comprobante', async (req, res) => {
let payment_id = req.query.tid;
let charge_id = req.query.cid;
let queryResult = {};
try {
queryResult = await dynamoDb.get({
TableName: process.env.paymentsTableName,
Key: {
payment_id: payment_id,
charge_id: charge_id
}
}).promise();
} catch (e) {
res.send({ 'error': e })
}
let html = JSON.stringify(queryResult);
html += '<hr>';
html += '<form action="/dev/anular" method="post"><input type="hidden" name="buyOrden" value="' + payment_id +
'"><input type="submit" value="Anular"></form>'
return res.send(html);
});
app.post('/anular', async (req, res) => {
/*
const transaction = transactions[req.body.buyOrden];
wp.nullify({
authorizationCode: transaction.detailOutput.authorizationCode,
authorizedAmount: transaction.detailOutput.amount,
nullifyAmount: transaction.detailOutput.amount,
buyOrder: transaction.buyOrder
}).then((result) => {
console.log('anulación:', result);
return res.send('comprobante:' + JSON.stringify(transaction));
}).catch(onError(res));
*/
});
module.exports.handler = serverless(app);