81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = isIP;
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var _assertString = require('./util/assertString');
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var _assertString2 = _interopRequireDefault(_assertString);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var ipv4Maybe = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
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var ipv6Block = /^[0-9A-F]{1,4}$/i;
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function isIP(str) {
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var version = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';
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(0, _assertString2.default)(str);
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version = String(version);
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if (!version) {
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return isIP(str, 4) || isIP(str, 6);
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} else if (version === '4') {
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if (!ipv4Maybe.test(str)) {
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return false;
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}
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var parts = str.split('.').sort(function (a, b) {
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return a - b;
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});
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return parts[3] <= 255;
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} else if (version === '6') {
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var blocks = str.split(':');
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var foundOmissionBlock = false; // marker to indicate ::
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// At least some OS accept the last 32 bits of an IPv6 address
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// (i.e. 2 of the blocks) in IPv4 notation, and RFC 3493 says
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// that '::ffff:a.b.c.d' is valid for IPv4-mapped IPv6 addresses,
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// and '::a.b.c.d' is deprecated, but also valid.
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var foundIPv4TransitionBlock = isIP(blocks[blocks.length - 1], 4);
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var expectedNumberOfBlocks = foundIPv4TransitionBlock ? 7 : 8;
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if (blocks.length > expectedNumberOfBlocks) {
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return false;
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}
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// initial or final ::
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if (str === '::') {
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return true;
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} else if (str.substr(0, 2) === '::') {
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blocks.shift();
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blocks.shift();
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foundOmissionBlock = true;
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} else if (str.substr(str.length - 2) === '::') {
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blocks.pop();
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blocks.pop();
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foundOmissionBlock = true;
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}
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for (var i = 0; i < blocks.length; ++i) {
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// test for a :: which can not be at the string start/end
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// since those cases have been handled above
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if (blocks[i] === '' && i > 0 && i < blocks.length - 1) {
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if (foundOmissionBlock) {
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return false; // multiple :: in address
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}
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foundOmissionBlock = true;
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} else if (foundIPv4TransitionBlock && i === blocks.length - 1) {
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// it has been checked before that the last
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// block is a valid IPv4 address
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} else if (!ipv6Block.test(blocks[i])) {
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return false;
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}
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}
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if (foundOmissionBlock) {
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return blocks.length >= 1;
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}
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return blocks.length === expectedNumberOfBlocks;
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}
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return false;
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}
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module.exports = exports['default']; |