16 lines
543 B
TypeScript
16 lines
543 B
TypeScript
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export function isLoopbackHost(host: string): boolean {
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let normalized = host.trim().toLowerCase();
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if (normalized.endsWith(".")) normalized = normalized.slice(0, -1);
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if (normalized.startsWith("[") && normalized.endsWith("]")) {
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normalized = normalized.slice(1, -1);
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}
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if (normalized === "localhost" || normalized === "::1") return true;
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const octets = normalized.split(".");
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return (
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octets.length === 4 &&
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octets[0] === "127" &&
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octets.every((octet) => /^\d{1,3}$/.test(octet) && Number(octet) <= 255)
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);
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}
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