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order_api.js
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var axios = require("axios");
var bodyParser = require('body-parser');
var db = require('./db.js');
var db_utils = require('./db_utils');
const API_PATH = "/api";
var currencies = ["INR", "GBP", "CAD", "BTC", "EUR"];
const CURRENCY_API_ACCESS_KEY = "e7ec8436b2042f209fb149fb9f159a80";
const INSERT_ORDERS_COLUMNS = ['event_id', 'user_id', 'price'];
const SELECT_ORDERS_COLUMNS = ['order_id', 'event_id', 'user_id', 'price'];
module.exports = function(app) {
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.get(API_PATH + '/getOrder', (req, res) => {
var orderId = req.query.orderId;
if (db_utils.nullOrEmpty(orderId)) {
res.status(400).send("Missing orderId parameter");
} else if (isNaN(orderId) || (parseInt(orderId) <= 0)) {
res.status(400).send("Invalid orderId");
} else {
db_utils.getOrderById(orderId, function(err, result) {
if (err) {
res.status(500).send(err);
} else if (result.length) {
var userId = result[0].user_id;
var eventId = result[0].event_id;
db_utils.getUserById(userId, function(err, result) {
if (err) {
res.status(500).send(err);
} else if (result.length) {
var first_name = result[0].first_name;
var last_name = result[0].last_name;
db_utils.getEventById(eventId, function(err, result) {
if (err) {
res.status(500).send(err);
} else if (result.length) {
res.send({"first_name":first_name,"last_name":last_name,"title":result[0].title, "price":result[0].price});
} else {
res.status(404).send("Event not found");
}
});
} else {
res.status(404).send("User not found");
}
});
} else {
res.status(404).send("Order not found");
}
});
}
})
app.get(API_PATH + '/getOrders', (req, res) => {
var response = [];
var numRow = 0;
db.query("SELECT ?? FROM ??", [SELECT_ORDERS_COLUMNS, 'orders'], function (err, results, fields) {
if (err) throw err;
if (results.length) {
results.forEach(row => {
db_utils.getUserById(row.user_id, function(err, user) {
if (err) {
res.status(500).send(err);
} else if (user.length) {
db_utils.getEventById(row.event_id, function(err, event) {
numRow++;
if (err) {
res.status(500).send(err);
} else if (event.length) {
response.push({"first_name":user[0].first_name,"last_name":user[0].last_name,"title":event[0].title,"price":row.price});
}
if (numRow == results.length) {
res.send(JSON.stringify(response));
}
});
}
});
});
} else {
res.status(404).send("No order in database");
}
});
})
app.post(API_PATH + '/createOrder', (req, res) => {
var userId = req.body.userId;
var eventId = req.body.eventId;
var price = req.body.price;
if (db_utils.nullOrEmpty(userId)) {
res.status(400).send("Missing userId parameter");
} else if (db_utils.nullOrEmpty(eventId)) {
res.status(400).send("Missing eventId parameter");
} else if (db_utils.nullOrEmpty(price)) {
res.status(400).send("Missing price parameter");
} else {
if (isNaN(userId) || (parseInt(userId) <= 0)) {
res.status(400).send("Invalid userId");
}
if (isNaN(eventId) || (parseInt(eventId) <= 0)) {
res.status(400).send("Invalid eventId");
}
if (isNaN(price) || (parseInt(price) < 0)) {
res.status(400).send("Invalid price");
}
db_utils.getUserById(userId, function(err, result) {
if (err) {
res.status(500).send(err);
} else if (result.length) {
db_utils.getEventById(eventId, function(err, result) {
if (err) {
res.status(500).send(err);
} else if (result.length) {
var values = [eventId, userId, price];
db.query("INSERT INTO ?? (??) VALUES (?)", ['orders', INSERT_ORDERS_COLUMNS, values], function (err, result, fields) {
if (err) throw err;
res.send({"id":result.insertId});
});
} else {
res.status(404).send("Event doesn't exist");
}
});
} else {
res.status(404).send("User doesn't exist");
}
});
}
})
app.post(API_PATH + '/deleteOrder', (req, res) => {
var orderId = req.body.orderId;
if (db_utils.nullOrEmpty(orderId)) {
res.status(400).send("Missing orderId parameter");
} if (isNaN(orderId) || (parseInt(orderId) <= 0)) {
res.status(400).send("Invalid orderId");
} else {
db_utils.getOrderById(orderId, function(err, result) {
if (err) {
res.status(500).send(err);
} else if (result) {
db.query("DELETE FROM ?? WHERE order_id = ?", ['orders', orderId], function (err, result, fields) {
if (err) {
res.status(500).send(err);
} else if (result.affectedRows) {
res.send("successfully deleted order");
} else {
res.status(404).send("Order not found");
}
});
} else {
res.status(404).send("Order not found");
}
});
}
})
app.get(API_PATH + '/getCurrencyConversion', (req, res) => {
var amount = req.query.amount;
if (db_utils.nullOrEmpty(amount)) {
res.status(400).send("Missing amount parameter");
} else if (isNaN(amount) || (parseInt(amount) < 0)) {
res.status(400).send("Invalid amount");
}
axios.get('http://www.apilayer.net/api/live?access_key=' + CURRENCY_API_ACCESS_KEY + '¤cies=' + currencies.join())
.then(response => {
var quotes = response.data.quotes;
var gbpRate = quotes.USDGBP;
var eurRate = quotes.USDEUR;
var btcRate = quotes.USDBTC;
var cadRate = quotes.USDCAD;
var inrRate = quotes.USDINR;
res.status(200).send({"GBP" : amount*gbpRate, "INR" : amount*inrRate, "EUR" : amount*eurRate, "BTC" : amount*btcRate, "CAD" : amount*cadRate});
})
.catch(error => {
res.status(500).send(error);
})
})
};