30 lines
1.3 KiB
TypeScript
30 lines
1.3 KiB
TypeScript
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/**
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* UUID v4 generator with a polyfill for non-secure contexts.
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*
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* `crypto.randomUUID()` is only exposed on secure contexts (HTTPS, localhost,
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* 127.0.0.1, ::1). When Velxio is self-hosted and accessed via a LAN IP over
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* plain HTTP (e.g. `http://192.168.31.139:3080/`), `crypto.randomUUID` is
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* `undefined` and any code path that calls it throws `TypeError`. That bug
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* silently broke ESP32 simulation start for self-hosters — frontend never sent
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* the start request because the UUID call rejected before reaching the WS
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* connection.
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*
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* `crypto.getRandomValues()` IS available in non-secure contexts, so we
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* fall back to building a v4 UUID by hand.
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*/
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export function generateUUID(): string {
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if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
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return crypto.randomUUID();
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}
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const bytes = new Uint8Array(16);
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if (typeof crypto !== 'undefined' && typeof crypto.getRandomValues === 'function') {
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crypto.getRandomValues(bytes);
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} else {
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for (let i = 0; i < 16; i++) bytes[i] = Math.floor(Math.random() * 256);
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}
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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, (b) => b.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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