16 lines
679 B
TypeScript
16 lines
679 B
TypeScript
import { createHash } from 'node:crypto';
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const LEGACY_USER_NAMESPACE = 'sammo-ts:legacy-root-member:v1';
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export const legacyUserId = (memberNo: number): string => {
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if (!Number.isSafeInteger(memberNo) || memberNo <= 0) {
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throw new Error(`Legacy member number must be a positive safe integer: ${memberNo}`);
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}
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const bytes = createHash('sha256').update(`${LEGACY_USER_NAMESPACE}:${memberNo}`).digest().subarray(0, 16);
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bytes[6] = (bytes[6]! & 0x0f) | 0x50;
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bytes[8] = (bytes[8]! & 0x3f) | 0x80;
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const hex = bytes.toString('hex');
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return `${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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