jayjennings
3f6dff5f24
- Add permissions logic for status options in corrective actions. - Create tests for permissions functionality. - Implement queries for user authentication and actions management. - Develop Actions page to display and manage corrective actions. - Create authentication pages for login, setup, and password reset. - Add IncidentDetail page to view incident details and associated actions. - Implement Settings page for user management and password changes.
22 lines
1.3 KiB
TypeScript
22 lines
1.3 KiB
TypeScript
export interface DetectedType {
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contentType: string
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extension: string
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}
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const startsWith = (bytes: Uint8Array, signature: number[], offset = 0) => signature.every((byte, i) => bytes[offset + i] === byte)
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const ascii = (bytes: Uint8Array, from: number, to: number) => String.fromCharCode(...bytes.subarray(from, to))
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/**
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* Identifies photos and PDFs from their first bytes, ignoring the client's claimed type and file name.
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* Returns null for anything else, so only these formats are ever stored and served.
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*/
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export function detectFileType(bytes: Uint8Array): DetectedType | null {
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if (startsWith(bytes, [0xff, 0xd8, 0xff])) return { contentType: 'image/jpeg', extension: 'jpg' }
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if (startsWith(bytes, [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])) return { contentType: 'image/png', extension: 'png' }
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if (ascii(bytes, 0, 6) === 'GIF87a' || ascii(bytes, 0, 6) === 'GIF89a') return { contentType: 'image/gif', extension: 'gif' }
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if (ascii(bytes, 0, 4) === 'RIFF' && ascii(bytes, 8, 12) === 'WEBP') return { contentType: 'image/webp', extension: 'webp' }
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if (ascii(bytes, 4, 8) === 'ftyp' && ['heic', 'heix', 'mif1', 'msf1'].includes(ascii(bytes, 8, 12))) return { contentType: 'image/heic', extension: 'heic' }
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if (ascii(bytes, 0, 5) === '%PDF-') return { contentType: 'application/pdf', extension: 'pdf' }
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return null
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}
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