forked from jappel/leistungsbilanz-ts
79fcb75ffb
crypto.randomUUID() is only defined in secure contexts (HTTPS or localhost). Opened over plain HTTP from another machine in the LAN, the circuit list editor failed with "crypto.randomUUID is not a function" whenever it created a circuit, device row, circuit group or distribution board component, including typing into the -frei- row. createClientId() uses crypto.randomUUID() where available and otherwise builds an RFC 4122 version 4 UUID from crypto.getRandomValues(), which works in every context. AGENTS.md notes the rule. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
27 lines
968 B
TypeScript
27 lines
968 B
TypeScript
/**
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* Creates a random RFC 4122 version 4 UUID for new entities built in the
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* browser.
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*
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* crypto.randomUUID() exists only in secure contexts (HTTPS or localhost).
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* The app is also opened over plain HTTP from other machines in the LAN, where
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* it is undefined, so fall back to crypto.getRandomValues(), which is
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* available in every context.
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*/
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export function createClientId(
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source: Pick<Crypto, "getRandomValues"> & Partial<Pick<Crypto, "randomUUID">> = crypto
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): string {
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if (typeof source.randomUUID === "function") {
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return source.randomUUID();
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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; // version 4
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bytes[8] = (bytes[8] & 0x3f) | 0x80; // RFC 4122 variant
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const hex = Array.from(bytes, (byte) => byte.toString(16).padStart(2, "0")).join("");
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return [
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hex.slice(0, 8),
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hex.slice(8, 12),
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hex.slice(12, 16),
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hex.slice(16, 20),
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hex.slice(20),
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].join("-");
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}
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