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/*
* datona-lib assertions. Used to encourage strong typing of parameters.
*
* Copyright (C) 2020 Datona Labs
*
* This program 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY 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 this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
const errors = require('./errors');
const VALID_BLOCKCHAIN_ADDRESS_REGEX = /^0x[0-9a-fA-F]{40}$/;
const VALID_PRIVATE_KEY_REGEX = /^[0-9a-fA-F]{64}$/;
const VALID_HASH_REGEX = /^[0-9a-fA-F]{64}$/;
const VALID_URL_SCHEME = /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$/;
const VALID_URL_HOSTNAME = /^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])$/;
function isNotEmpty(value, name) {
const result = (value !== undefined) && !/^\s*$/.test(value);
if (name !== undefined && !result) throw new errors.TypeError(name + " is missing or empty");
else return result;
}
exports.equals = function(value, expected, name) {
const result = (value === expected);
if (name !== undefined && !result) throw new errors.DatonaError(name + ": expected '" + value + "' to equal '" + expected + "'");
else return result;
};
exports.notEquals = function(value, expected, name) {
const result = (value !== expected);
if (name !== undefined && !result) throw new errors.DatonaError(name + ": expected '" + value + "' to not equal '" + expected + "'");
else return result;
};
exports.isNotEmpty = isNotEmpty;
exports.isPresent = isNotEmpty;
exports.isNotNull = function(value, name) {
const result = (value !== undefined);
if (name !== undefined && !result) throw new errors.TypeError(name + " is null");
else return result;
};
exports.isArray = function(value, name) {
const result = exports.isNotNull(value, name) && Array.isArray(value);
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected Array");
else return result;
};
exports.isBoolean = function(value, name) {
const result = isNotEmpty(value, name) && (toString.call(value) === '[object Boolean]');
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected Boolean");
else return result;
};
exports.isBuffer = function(value, name) {
const result = isNotEmpty(value, name) && Buffer.isBuffer(value);
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected Buffer");
else return result;
};
exports.isFunction = function(value, name) {
const result = isNotEmpty(value, name) && (toString.call(value) === '[object Function]');
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected function");
else return result;
};
exports.isNumber = function(value, name) {
const result = isNotEmpty(value, name) && (toString.call(value) === '[object Number]');
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected number");
else return result;
};
exports.isString = function(value, name) {
const result = isNotEmpty(value, name) && (toString.call(value) === '[object String]');
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected string");
else return result;
};
exports.isObject = function(value, name) {
const result = isNotEmpty(value, name) && (toString.call(value) === '[object Object]');
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected Object");
else return result;
};
exports.isHexString = function(value, name) {
const result = isNotEmpty(value, name) && (toString.call(value) === '[object String]') && value.match('^[0-9a-fA-F]*$');
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected hex string");
else return result;
};
exports.isHash = function(value, name) {
const result = isNotEmpty(value, name) && VALID_HASH_REGEX.test(value);
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected hex string of length 64");
else return result;
};
exports.isPrivateKey = function(value, name) {
const result = isNotEmpty(value, name) && VALID_PRIVATE_KEY_REGEX.test(value);
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected hex string of length 64");
else return result;
};
exports.isAddress = function(value, name) {
const result = isNotEmpty(value, name) && VALID_BLOCKCHAIN_ADDRESS_REGEX.test(value);
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected address");
else return result;
};
exports.isUrl = function(value, name) {
var result = isNotEmpty(value, name) && (toString.call(value) === '[object Object]');
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected Object");
result &= exports.matches(value.scheme, VALID_URL_SCHEME, name ? name + " scheme" : undefined);
result &= exports.matches(value.host, VALID_URL_HOSTNAME, name ? name + " host" : undefined);
result &= exports.isNumber(value.port, name ? name + " port" : undefined);
return result;
};
exports.isInstanceOf = function(value, name, type) {
const result = isNotEmpty(value, name) && (value instanceof type);
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected " + type.name);
else return result;
};
exports.matches = function(value, regex, name) {
exports.isString(value, name);
const result = value.match(regex);
if (name !== undefined && !result) throw new errors.TypeError(name + ": invalid type. Expected to match '"+regex+"'");
else return result;
};
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