add manga library

src/app/api/comics/page/route.ts

@@ -0,0 +1,71 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { getLibrary, resolveLibraryRoot, resolveAndJail } from '@/lib/libraries'
+import { getComicPageBuffer } from '@/lib/comics'
+import { requireLibraryAccess } from '@/lib/auth'
+import { getDb } from '@/lib/db'
+
+const EXT_TO_MIME: Record<string, string> = {
+  '.jpg': 'image/jpeg',
+  '.jpeg': 'image/jpeg',
+  '.png': 'image/png',
+  '.webp': 'image/webp',
+  '.gif': 'image/gif',
+}
+
+export async function GET(request: NextRequest) {
+  const { searchParams } = request.nextUrl
+  const libraryId = searchParams.get('libraryId')
+  const issueKey = searchParams.get('issueKey')
+  const pageIndexStr = searchParams.get('pageIndex')
+
+  if (!libraryId || !issueKey || pageIndexStr === null) {
+    return NextResponse.json({ error: 'Missing libraryId, issueKey, or pageIndex' }, { status: 400 })
+  }
+
+  const pageIndex = parseInt(pageIndexStr, 10)
+  if (isNaN(pageIndex) || pageIndex < 0) {
+    return NextResponse.json({ error: 'Invalid pageIndex' }, { status: 400 })
+  }
+
+  const auth = await requireLibraryAccess(request, libraryId)
+  if (auth instanceof NextResponse) return auth
+
+  const library = getLibrary(libraryId)
+  if (!library) {
+    return NextResponse.json({ error: 'Library not found' }, { status: 404 })
+  }
+
+  const db = getDb()
+  const row = db
+    .prepare('SELECT file_path FROM media_items WHERE item_key = ? AND item_type = ?')
+    .get(issueKey, 'comic_issue') as { file_path: string | null } | undefined
+
+  if (!row?.file_path) {
+    return NextResponse.json({ error: 'Issue not found' }, { status: 404 })
+  }
+
+  const root = resolveLibraryRoot(library)
+
+  let absPath: string
+  try {
+    absPath = resolveAndJail(root, row.file_path)
+  } catch {
+    return NextResponse.json({ error: 'Forbidden' }, { status: 403 })
+  }
+
+  const result = getComicPageBuffer(absPath, pageIndex)
+  if (!result) {
+    return NextResponse.json({ error: 'Page not found' }, { status: 404 })
+  }
+
+  const mimeType = EXT_TO_MIME[result.ext] ?? 'image/jpeg'
+
+  return new NextResponse(result.buffer as unknown as BodyInit, {
+    status: 200,
+    headers: {
+      'Content-Type': mimeType,
+      'Content-Length': String(result.buffer.length),
+      'Cache-Control': 'public, max-age=86400',
+    },
+  })
+}