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normalize.js
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normalize.js
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'use strict';
var Logger = require('../../lib/logger');
var log = new Logger({scope: 'normalize'});
var smoment = require('../../lib/smoment');
var Promise = require('bluebird');
var hbase = require('../../lib/hbase')
var PRECISION = 8;
function normalize(req, res) {
var options = {
date: smoment(req.query.date),
amount: Number(req.query.amount),
currency: (req.query.currency || 'XRP').toUpperCase(),
issuer: req.query.issuer || '',
exchange_currency: (req.query.exchange_currency || 'XRP').toUpperCase(),
exchange_issuer: req.query.exchange_issuer || '',
strict: (/false/i).test(req.query.strict) ? false : true
};
// conversion to XRP
function getXRPrate() {
if (options.currency === 'XRP') {
return Promise.resolve(1);
} else {
return hbase.getExchangeRate({
date: options.date,
strict: options.strict,
base: {
currency: options.currency,
issuer: options.issuer
}
});
}
}
// conversion to exchange currency
function getExchangeRate() {
if (options.exchange_currency === 'XRP') {
return Promise.resolve(1);
} else {
return hbase.getExchangeRate({
date: options.date,
strict: options.strict,
base: {
currency: options.exchange_currency,
issuer: options.exchange_issuer
}
});
}
}
/**
* errorResponse
* return an error response
* @param {Object} err
*/
function errorResponse(err) {
log.error(err.error || err);
if (err.code && err.code.toString()[0] === '4') {
res.status(err.code).json({
result: 'error',
message: err.error
});
} else {
res.json({
result: 'error',
message: 'unable to retrieve exchanges'
});
}
}
/**
* successResponse
* return a successful response
* @param {Object} exchanges
*/
function successResponse(data) {
res.json({
result: 'success',
amount: data.amount.toString(),
converted: data.converted.toString(),
rate: data.rate.toPrecision(PRECISION)
});
}
if (isNaN(options.amount)) {
errorResponse({error: 'invalid amount', code: 400});
return;
} else if (!options.currency) {
errorResponse({error: 'currency is required', code: 400});
return;
} else if (options.currency === 'XRP' && options.issuer) {
errorResponse({error: 'XRP cannot have an issuer', code: 400});
return;
} else if (options.currency !== 'XRP' && !options.issuer) {
errorResponse({error: 'issuer is required', code: 400});
return;
} else if (options.exchange_currency === 'XRP' && options.exchange_issuer) {
errorResponse({error: 'XRP cannot have an issuer', code: 400});
return;
} else if (options.exchange_currency !== 'XRP' && !options.exchange_issuer) {
errorResponse({error: 'issuer is required', code: 400});
return;
}
if (options.date.moment.diff(smoment().moment) > 10) {
errorResponse({error: 'must not be a future date', code: 400});
return;
}
if (options.currency === options.exchange_currency &&
options.issuer === options.exchange_issuer) {
successResponse({
amount: options.amount,
converted: options.amount,
rate: 1
});
return;
}
Promise.all([
getXRPrate(),
getExchangeRate()
])
.nodeify(function(err, resp) {
if (err) {
errorResponse(err);
} else {
var rate = resp[1] ? resp[0] / resp[1] : 0;
successResponse({
amount: options.amount,
converted: options.amount * rate,
rate: rate
});
}
});
}
module.exports = normalize