15 lines
528 B
TypeScript
15 lines
528 B
TypeScript
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/**
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* Takes an object with a hostname property (like a parsed URL) and some
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* headers that may contain Host and returns the preferred hostname.
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* @param parsed An object containing a hostname property.
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* @param headers A dictionary with headers containing a `host`.
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*/
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export function getHostname(
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parsed: { hostname?: string | null },
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headers?: { [key: string]: string | string[] | undefined }
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) {
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return ((!Array.isArray(headers?.host) && headers?.host) || parsed.hostname)
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?.split(':')[0]
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.toLowerCase()
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}
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