add thumbnail generation

src/app/api/thumbnail/route.ts

@@ -0,0 +1,62 @@
+import { NextRequest, NextResponse } from 'next/server'
+import fs from 'fs'
+import path from 'path'
+import { getLibrary, resolveLibraryRoot, resolveAndJail } from '@/lib/libraries'
+import { getThumbnailPath } from '@/lib/thumbnails'
+
+const VIDEO_EXTENSIONS = new Set(['.mp4', '.mov', '.mkv', '.avi', '.webm', '.m4v'])
+const IMAGE_EXTENSIONS = new Set(['.jpg', '.jpeg', '.png', '.gif', '.webp', '.bmp', '.tiff', '.tif'])
+
+function getMediaType(filePath: string): 'image' | 'video' | null {
+  const ext = path.extname(filePath).toLowerCase()
+  if (IMAGE_EXTENSIONS.has(ext)) return 'image'
+  if (VIDEO_EXTENSIONS.has(ext)) return 'video'
+  return null
+}
+
+export async function GET(request: NextRequest) {
+  const { searchParams } = request.nextUrl
+  const libraryId = searchParams.get('libraryId')
+  const subpath = searchParams.get('path')
+
+  if (!libraryId || !subpath) {
+    return NextResponse.json({ error: 'Missing libraryId or path' }, { status: 400 })
+  }
+
+  const library = getLibrary(libraryId)
+  if (!library) {
+    return NextResponse.json({ error: 'Library not found' }, { status: 404 })
+  }
+
+  const root = resolveLibraryRoot(library)
+
+  let filePath: string
+  try {
+    filePath = resolveAndJail(root, subpath)
+  } catch {
+    return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
+  }
+
+  const mediaType = getMediaType(filePath)
+  if (!mediaType) {
+    return NextResponse.json({ error: 'Thumbnails are only supported for image and video files' }, { status: 400 })
+  }
+
+  try {
+    const thumbnailPath = await getThumbnailPath(filePath, libraryId, mediaType)
+    const stat = fs.statSync(thumbnailPath)
+    const stream = fs.createReadStream(thumbnailPath)
+
+    return new NextResponse(stream as unknown as ReadableStream, {
+      status: 200,
+      headers: {
+        'Content-Type': 'image/jpeg',
+        'Content-Length': String(stat.size),
+        'Cache-Control': 'public, max-age=86400',
+      },
+    })
+  } catch (err) {
+    console.error(`Thumbnail generation failed for ${filePath}:`, err)
+    return new NextResponse(null, { status: 404 })
+  }
+}