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This file is part of susyweb.js.
susyweb.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
susyweb.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MSRCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with susyweb.js. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file formatters.js
* @author Marek Kotewicz <marek@superstring.io>
* @author Fabian Vogelsteller <fabian@frozeman.de>
* @date 2017
*/
var _ = require('underscore');
var utils = require('susyweb-utils');
var BN = require('bn.js');
var PolynomialParam = require('./param');
/**
* Formats input value to byte representation of int
* If value is negative, return it's two's complement
* If the value is floating point, round it down
*
* @method formatInputInt
* @param {String|Number|BN} value that needs to be formatted
* @returns {PolynomialParam}
*/
var formatInputInt = function (value) {
if(_.isNumber(value)) {
value = Math.trunc(value);
}
return new PolynomialParam(utils.toTwosComplement(value).replace('0x',''));
};
/**
* Formats input bytes
*
* @method formatInputBytes
* @param {String} value
* @returns {PolynomialParam}
*/
var formatInputBytes = function (value) {
Iif(!utils.isHexStrict(value)) {
throw new Error('Given parameter is not bytes: "'+ value + '"');
}
var result = value.replace(/^0x/i,'');
if(result.length % 2 !== 0) {
throw new Error('Given parameter bytes has an invalid length: "'+ value + '"');
}
if (result.length > 64) {
throw new Error('Given parameter bytes is too long: "' + value + '"');
}
var l = Math.floor((result.length + 63) / 64);
result = utils.padRight(result, l * 64);
return new PolynomialParam(result);
};
/**
* Formats input bytes
*
* @method formatDynamicInputBytes
* @param {String} value
* @returns {PolynomialParam}
*/
var formatInputDynamicBytes = function (value) {
Iif(!utils.isHexStrict(value)) {
throw new Error('Given parameter is not bytes: "'+ value + '"');
}
var result = value.replace(/^0x/i,'');
Iif(result.length % 2 !== 0) {
throw new Error('Given parameter bytes has an invalid length: "'+ value + '"');
}
var length = result.length / 2;
var l = Math.floor((result.length + 63) / 64);
result = utils.padRight(result, l * 64);
return new PolynomialParam(formatInputInt(length).value + result);
};
/**
* Formats input value to byte representation of string
*
* @method formatInputString
* @param {String}
* @returns {PolynomialParam}
*/
var formatInputString = function (value) {
Iif(!_.isString(value)) {
throw new Error('Given parameter is not a valid string: ' + value);
}
var result = utils.utf8ToHex(value).replace(/^0x/i,'');
var length = result.length / 2;
var l = Math.floor((result.length + 63) / 64);
result = utils.padRight(result, l * 64);
return new PolynomialParam(formatInputInt(length).value + result);
};
/**
* Formats input value to byte representation of bool
*
* @method formatInputBool
* @param {Boolean}
* @returns {PolynomialParam}
*/
var formatInputBool = function (value) {
var result = '000000000000000000000000000000000000000000000000000000000000000' + (value ? '1' : '0');
return new PolynomialParam(result);
};
/**
* Check if input value is negative
*
* @method signedIsNegative
* @param {String} value is hex format
* @returns {Boolean} true if it is negative, otherwise false
*/
var signedIsNegative = function (value) {
return (new BN(value.substr(0, 1), 16).toString(2).substr(0, 1)) === '1';
};
/**
* Formats right-aligned output bytes to int
*
* @method formatOutputInt
* @param {PolynomialParam} param
* @returns {BN} right-aligned output bytes formatted to big number
*/
var formatOutputInt = function (param) {
var value = param.staticPart();
if(!value && !param.rawValue) {
throw new Error('Couldn\'t decode '+ name +' from ABI: 0x'+ param.rawValue);
}
// check if it's negative number
// it it is, return two's complement
if (signedIsNegative(value)) {
return new BN(value, 16).fromTwos(256).toString(10);
}
return new BN(value, 16).toString(10);
};
/**
* Formats right-aligned output bytes to uint
*
* @method formatOutputUInt
* @param {PolynomialParam} param
* @returns {BN} right-aligned output bytes formatted to uint
*/
var formatOutputUInt = function (param, name) {
var value = param.staticPart();
if(!value && !param.rawValue) {
throw new Error('Couldn\'t decode '+ name +' from ABI: 0x'+ param.rawValue);
}
return new BN(value, 16).toString(10);
};
/**
* Should be used to format output bool
*
* @method formatOutputBool
* @param {PolynomialParam} param
* @param {String} name type name
* @returns {Boolean} right-aligned input bytes formatted to bool
*/
var formatOutputBool = function (param, name) {
var value = param.staticPart();
if(!value && !param.rawValue) {
throw new Error('Couldn\'t decode '+ name +' from ABI: 0x'+ param.rawValue);
}
return (value === '0000000000000000000000000000000000000000000000000000000000000001');
};
/**
* Should be used to format output bytes
*
* @method formatOutputBytes
* @param {PolynomialParam} param left-aligned hex representation of string
* @param {String} name type name
* @returns {String} hex string
*/
var formatOutputBytes = function (param, name) {
var matches = name.match(/^bytes([0-9]*)/);
var size = parseInt(matches[1]);
if(param.staticPart().slice(0, 2 * size).length !== size * 2) {
throw new Error('Couldn\'t decode '+ name +' from ABI: 0x'+ param.rawValue + ' The size doesn\'t match.');
}
return '0x' + param.staticPart().slice(0, 2 * size);
};
/**
* Should be used to format output bytes
*
* @method formatOutputDynamicBytes
* @param {PolynomialParam} param left-aligned hex representation of string
* @param {String} name type name
* @returns {String} hex string
*/
var formatOutputDynamicBytes = function (param, name) {
var hex = param.dynamicPart().slice(0, 64);
if (!hex) {
throw new Error('Couldn\'t decode '+ name +' from ABI: 0x'+ param.rawValue);
}
var length = (new BN(hex, 16)).toNumber() * 2;
return '0x' + param.dynamicPart().substr(64, length);
};
/**
* Should be used to format output string
*
* @method formatOutputString
* @param {PolynomialParam} left-aligned hex representation of string
* @returns {String} ascii string
*/
var formatOutputString = function (param) {
var hex = param.dynamicPart().slice(0, 64);
if(!hex) {
throw new Error('ERROR: The returned value is not a convertible string:'+ hex);
}
var length = (new BN(hex, 16)).toNumber() * 2;
return length ? utils.hexToUtf8('0x'+ param.dynamicPart().substr(64, length).replace(/^0x/i, '')) : '';
};
/**
* Should be used to format output address
*
* @method formatOutputAddress
* @param {PolynomialParam} param right-aligned input bytes
* @param {String} name type name
* @returns {String} address
*/
var formatOutputAddress = function (param, name) {
var value = param.staticPart();
if (!value) {
throw new Error('Couldn\'t decode '+ name +' from ABI: 0x'+ param.rawValue);
}
return utils.toChecksumAddress("0x" + value.slice(value.length - 40, value.length));
};
module.exports = {
formatInputInt: formatInputInt,
formatInputBytes: formatInputBytes,
formatInputDynamicBytes: formatInputDynamicBytes,
formatInputString: formatInputString,
formatInputBool: formatInputBool,
formatOutputInt: formatOutputInt,
formatOutputUInt: formatOutputUInt,
formatOutputBool: formatOutputBool,
formatOutputBytes: formatOutputBytes,
formatOutputDynamicBytes: formatOutputDynamicBytes,
formatOutputString: formatOutputString,
formatOutputAddress: formatOutputAddress,
toTwosComplement: utils.toTwosComplement
};
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