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18 lines
519 B
JavaScript
18 lines
519 B
JavaScript
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function is_localhost(ip) {
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if (ip === 'localhost') {
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return true;
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}
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const localRanges = ['127.0.0.1', '192.168.0.0/16', '10.0.0.0/8', '172.16.0.0/12'];
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const ipToInt = ip => ip.split('.').reduce((acc, octet) => (acc << 8) + +octet, 0) >>> 0;
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return localRanges.some(range => {
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const [rangeStart, rangeSize = 32] = range.split('/');
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const start = ipToInt(rangeStart);
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const end = (start | (1 << (32 - +rangeSize))) >>> 0;
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return ipToInt(ip) >= start && ipToInt(ip) <= end;
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});
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}
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