Ty
e36979617b
- frontend: uuid() helper (crypto.randomUUID -> getRandomValues) for plain-HTTP LAN UAT - slabs.py: empty SKU at create -> NULL (no-SKU-yet is transient, filled in Review) - review.py: ready-gate enforces REVIEW-45 (SKU 3-24 alnum+hyphen) in the middle tier - DB CHECK stays as backstop only (referential/structural), per layering principle
49 lines
2.3 KiB
TypeScript
49 lines
2.3 KiB
TypeScript
// Supported clients: iOS Safari, Android Chrome, PC Chrome/Edge/Firefox.
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// Gated on required API presence; anything missing → hard stop.
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export function supported(): string | null {
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if (typeof window === 'undefined') return 'window unavailable';
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if (typeof createImageBitmap !== 'function') return 'createImageBitmap';
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if (typeof Worker === 'undefined') return 'Worker';
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if (typeof indexedDB === 'undefined') return 'IndexedDB';
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const hasOffscreen =
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typeof OffscreenCanvas !== 'undefined' &&
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typeof OffscreenCanvas.prototype.convertToBlob === 'function';
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const hasCanvasBlob =
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typeof HTMLCanvasElement !== 'undefined' &&
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typeof HTMLCanvasElement.prototype.toBlob === 'function';
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if (!hasOffscreen && !hasCanvasBlob) return 'canvas PNG encode';
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const ua = navigator.userAgent;
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const isIOS = /iPad|iPhone|iPod/.test(ua) || (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1);
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const isAndroid = /Android/i.test(ua);
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const isSafari = /Safari/i.test(ua) && !/Chrome|CriOS|Edg|Firefox|FxiOS/i.test(ua);
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const isChrome = /Chrome|CriOS/i.test(ua) && !/Edg/i.test(ua);
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const isEdge = /Edg/i.test(ua);
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const isFirefox = /Firefox|FxiOS/i.test(ua);
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if (isIOS && isSafari) return null;
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if (isAndroid && isChrome) return null;
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if (!isIOS && !isAndroid && (isChrome || isEdge || isFirefox)) return null;
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return 'unsupported browser';
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}
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// v4 UUID. crypto.randomUUID() is only guaranteed on secure contexts
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// (HTTPS/localhost); the UAT host is plain HTTP on a LAN IP, where it is
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// undefined. Fall back to crypto.getRandomValues (available on HTTP) so the
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// client-generated ids (APP-20) work in both contexts.
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export function uuid(): string {
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const c = globalThis.crypto;
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if (c && typeof c.randomUUID === 'function') return c.randomUUID();
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if (c && typeof c.getRandomValues === 'function') {
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const b = new Uint8Array(16);
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c.getRandomValues(b);
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b[6] = (b[6] & 0x0f) | 0x40; // version 4
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b[8] = (b[8] & 0x3f) | 0x80; // variant 10
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const h = Array.from(b, (x) => x.toString(16).padStart(2, '0')).join('');
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return `${h.slice(0, 8)}-${h.slice(8, 12)}-${h.slice(12, 16)}-${h.slice(16, 20)}-${h.slice(20)}`;
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}
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return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (ch) => {
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const r = (Math.random() * 16) | 0;
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const v = ch === 'x' ? r : (r & 0x3) | 0x8;
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return v.toString(16);
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});
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}
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