38a6886863
Computes a SHA-256 partial-content fingerprint (file size + first 64 KB) for movies, TV episodes, and mixed files during scans. When a file is moved or renamed within a library, the scan detects the fingerprint match, renames the media_items row in-place, and updates media_tags.media_key to match — so tags and NFO metadata survive the move transparently. - src/lib/fingerprint.ts: new computeFingerprint() using sync FS reads - src/lib/db.ts: fingerprint TEXT column + index migration - src/lib/tags.ts: reKeyMediaItem() to update media_tags on rename - src/lib/scanner.ts: replace clear+upsert with detectMoves/reconcileAndPrune for movies, TV episodes, and mixed files; games retain clear+upsert (v1) - TV scan restructured to a single filesystem pass (no double-scanning) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
37 lines
975 B
TypeScript
37 lines
975 B
TypeScript
import fs from 'fs'
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import crypto from 'crypto'
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const CHUNK_SIZE = 64 * 1024 // 64 KB
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/**
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* Computes a stable partial-content fingerprint for a file.
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* Uses SHA-256 of the file size + first 64 KB of content.
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* Fast enough for large video files (~instant) and collision-resistant
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* for real-world media libraries.
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*
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* Returns null if the file cannot be read (missing, permission error, etc.).
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*/
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export function computeFingerprint(absolutePath: string): string | null {
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try {
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const stat = fs.statSync(absolutePath)
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const size = stat.size
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const chunkLen = Math.min(CHUNK_SIZE, size)
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const buf = Buffer.alloc(chunkLen)
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if (chunkLen > 0) {
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const fd = fs.openSync(absolutePath, 'r')
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try {
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fs.readSync(fd, buf, 0, chunkLen, 0)
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} finally {
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fs.closeSync(fd)
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}
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}
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return crypto
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.createHash('sha256')
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.update(`${size}:`)
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.update(buf)
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.digest('hex')
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} catch {
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return null
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}
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}
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