98 lines
2.2 KiB
JavaScript
98 lines
2.2 KiB
JavaScript
var $ = require('preconditions').singleton();
|
|
var _ = require('lodash');
|
|
|
|
var Bitcore = require('bitcore-lib');
|
|
var crypto = Bitcore.crypto;
|
|
var encoding = Bitcore.encoding;
|
|
|
|
var Utils = {};
|
|
|
|
Utils.checkRequired = function(obj, args) {
|
|
args = [].concat(args);
|
|
if (!_.isObject(obj)) return false;
|
|
for (var i = 0; i < args.length; i++) {
|
|
if (!obj.hasOwnProperty(args[i])) return false;
|
|
}
|
|
return true;
|
|
};
|
|
|
|
/**
|
|
*
|
|
* @desc rounds a JAvascript number
|
|
* @param number
|
|
* @return {number}
|
|
*/
|
|
Utils.strip = function(number) {
|
|
return (parseFloat(number.toPrecision(12)));
|
|
}
|
|
|
|
/* TODO: It would be nice to be compatible with bitcoind signmessage. How
|
|
* the hash is calculated there? */
|
|
Utils.hashMessage = function(text) {
|
|
$.checkArgument(text);
|
|
var buf = new Buffer(text);
|
|
var ret = crypto.Hash.sha256sha256(buf);
|
|
ret = new Bitcore.encoding.BufferReader(ret).readReverse();
|
|
return ret;
|
|
};
|
|
|
|
Utils.verifyMessage = function(text, signature, pubKey) {
|
|
$.checkArgument(text);
|
|
$.checkArgument(pubKey);
|
|
|
|
if (!signature)
|
|
return false;
|
|
|
|
var pub = new Bitcore.PublicKey(pubKey);
|
|
var hash = Utils.hashMessage(text);
|
|
|
|
try {
|
|
var sig = new crypto.Signature.fromString(signature);
|
|
return crypto.ECDSA.verify(hash, sig, pub, 'little');
|
|
} catch (e) {
|
|
return false;
|
|
}
|
|
};
|
|
|
|
Utils.formatAmount = function(satoshis, unit, opts) {
|
|
var UNITS = {
|
|
btc: {
|
|
toSatoshis: 100000000,
|
|
maxDecimals: 6,
|
|
minDecimals: 2,
|
|
},
|
|
bit: {
|
|
toSatoshis: 100,
|
|
maxDecimals: 0,
|
|
minDecimals: 0,
|
|
},
|
|
};
|
|
|
|
$.shouldBeNumber(satoshis);
|
|
$.checkArgument(_.contains(_.keys(UNITS), unit));
|
|
|
|
function addSeparators(nStr, thousands, decimal, minDecimals) {
|
|
nStr = nStr.replace('.', decimal);
|
|
var x = nStr.split(decimal);
|
|
var x0 = x[0];
|
|
var x1 = x[1];
|
|
|
|
x1 = _.dropRightWhile(x1, function(n, i) {
|
|
return n == '0' && i >= minDecimals;
|
|
}).join('');
|
|
var x2 = x.length > 1 ? decimal + x1 : '';
|
|
|
|
x0 = x0.replace(/\B(?=(\d{3})+(?!\d))/g, thousands);
|
|
return x0 + x2;
|
|
}
|
|
|
|
opts = opts || {};
|
|
|
|
var u = UNITS[unit];
|
|
var amount = (satoshis / u.toSatoshis).toFixed(u.maxDecimals);
|
|
return addSeparators(amount, opts.thousandsSeparator || ',', opts.decimalSeparator || '.', u.minDecimals);
|
|
};
|
|
|
|
|
|
module.exports = Utils;
|