Initial commit

src/app/api/cache/thumbnails/[filename]/route.ts

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+/**
+ * Component: Thumbnail Cache API Route
+ * Documentation: documentation/integrations/audible.md
+ */
+
+import { NextRequest, NextResponse } from 'next/server';
+import fs from 'fs/promises';
+import path from 'path';
+
+const CACHE_DIR = '/app/cache/thumbnails';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ filename: string }> }
+) {
+  try {
+    const { filename } = await params;
+
+    // Validate filename (prevent directory traversal)
+    if (!filename || filename.includes('..') || filename.includes('/')) {
+      return NextResponse.json(
+        { error: 'Invalid filename' },
+        { status: 400 }
+      );
+    }
+
+    const filePath = path.join(CACHE_DIR, filename);
+
+    // Check if file exists
+    try {
+      await fs.access(filePath);
+    } catch {
+      return NextResponse.json(
+        { error: 'File not found' },
+        { status: 404 }
+      );
+    }
+
+    // Read the file
+    const fileBuffer = await fs.readFile(filePath);
+
+    // Determine content type based on extension
+    const ext = path.extname(filename).toLowerCase();
+    const contentTypeMap: Record<string, string> = {
+      '.jpg': 'image/jpeg',
+      '.jpeg': 'image/jpeg',
+      '.png': 'image/png',
+      '.gif': 'image/gif',
+      '.webp': 'image/webp',
+    };
+
+    const contentType = contentTypeMap[ext] || 'application/octet-stream';
+
+    // Return the image with appropriate headers
+    return new NextResponse(fileBuffer, {
+      status: 200,
+      headers: {
+        'Content-Type': contentType,
+        'Cache-Control': 'public, max-age=86400', // Cache for 24 hours
+      },
+    });
+  } catch (error) {
+    console.error('[ThumbnailAPI] Error serving thumbnail:', error);
+    return NextResponse.json(
+      { error: 'Internal server error' },
+      { status: 500 }
+    );
+  }
+}