adminandClaude Sonnet 4.6
614c792225
- uploadEvidenceFile: validate file type via file-type magic bytes, reject client-supplied MIME, derive extension from detected type, upload ArrayBuffer - getEscalationThreshold: use setUTCHours instead of setHours so date-only ISO strings (always UTC midnight) compare consistently in any timezone - Tests: mock file-type, update upload expectation to ArrayBuffer Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CPf5Rc8QPx6V8KLEEgfKEQ
75 lines
3.0 KiB
TypeScript
75 lines
3.0 KiB
TypeScript
import type { SupabaseClient } from '@supabase/supabase-js'
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import { fileTypeFromBuffer } from 'file-type'
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export type EvidenceStage = 'report' | 'response' | 'investigation' | 'capa' | 'verification'
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const ALLOWED_MIME_TYPES = new Set([
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'image/jpeg', 'image/png', 'image/gif', 'image/webp', 'image/heic', 'image/avif',
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'video/mp4', 'video/quicktime', 'video/webm', 'video/x-msvideo',
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'application/pdf',
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'application/msword',
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'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
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'application/vnd.ms-excel',
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'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
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])
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export async function uploadEvidenceFile(
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supabase: SupabaseClient,
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file: File,
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incidentId: string,
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stage: EvidenceStage,
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): Promise<{ path: string; publicUrl: string; hash: string }> {
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const { data, error: authError } = await supabase.auth.getUser()
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if (authError || !data?.user) throw new Error('Not authenticated')
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const user = data.user
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// Server-side size limit before processing
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const isVideo = file.type.startsWith('video/')
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const maxBytes = isVideo ? 200 * 1024 * 1024 : 10 * 1024 * 1024
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if (file.size > maxBytes) {
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throw new Error(`File too large: max ${isVideo ? '200MB' : '10MB'} for this file type`)
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}
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// Magic-byte validation — do not trust client-supplied MIME type
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const buffer = await file.arrayBuffer()
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const detected = await fileTypeFromBuffer(buffer)
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const detectedMime = detected?.mime ?? null
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if (!detectedMime || !ALLOWED_MIME_TYPES.has(detectedMime)) {
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throw new Error(`File type not allowed: ${detectedMime ?? 'unknown'}`)
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}
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const ext = detected?.ext ?? file.name.split('.').pop() ?? 'bin'
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const filename = `${Date.now()}-${Math.random().toString(36).slice(2)}.${ext}`
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const path = `${user.id}/${incidentId}/${stage}/${filename}`
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const hash = await computeHashFromBuffer(buffer)
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const { data: uploadData, error } = await supabase.storage
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.from('evidence')
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.upload(path, buffer, { contentType: detectedMime, upsert: false })
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if (error) throw new Error(error.message)
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// Fix 1: Use createSignedUrl (private bucket) — 10-year URL for DB storage
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const { data: signedData, error: signedError } = await supabase.storage
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.from('evidence')
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.createSignedUrl(uploadData.path, 315360000) // ~10 years
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if (signedError || !signedData) throw new Error(signedError?.message ?? 'Failed to sign URL')
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return { path: uploadData.path, publicUrl: signedData.signedUrl, hash }
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}
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// Fix 1: getEvidenceUrl is now async, uses 1-hour signed URL
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export async function getEvidenceUrl(supabase: SupabaseClient, path: string): Promise<string> {
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const { data, error } = await supabase.storage.from('evidence').createSignedUrl(path, 3600)
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if (error || !data) throw new Error(error?.message ?? 'Failed to sign URL')
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return data.signedUrl
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}
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async function computeHashFromBuffer(buffer: ArrayBuffer): Promise<string> {
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const hashBuffer = await crypto.subtle.digest('SHA-256', buffer)
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return Array.from(new Uint8Array(hashBuffer))
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.map(b => b.toString(16).padStart(2, '0'))
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.join('')
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}
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