14 lines
674 B
TypeScript
14 lines
674 B
TypeScript
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/** Secure UUIDs also work on LAN HTTP, where randomUUID is unavailable. */
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export function secureUuid(): string {
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const source = globalThis.crypto
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if (typeof source?.randomUUID === 'function') return source.randomUUID()
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if (typeof source?.getRandomValues !== 'function') {
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throw new Error('Secure randomness is unavailable.')
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}
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const bytes = source.getRandomValues(new Uint8Array(16))
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bytes[6] = (bytes[6]! & 0x0f) | 0x40
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bytes[8] = (bytes[8]! & 0x3f) | 0x80
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const hex = Array.from(bytes, byte => byte.toString(16).padStart(2, '0')).join('')
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return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`
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}
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