Refactor code structure for improved readability and maintainability

app/uploads/covers/[filename]/route.ts

@@ -0,0 +1,38 @@
+import { NextResponse } from "next/server"
+import path from "path"
+import fs from "fs"
+
+export async function GET(request: Request, { params }: { params: Promise<{ filename: string }> }) {
+  const { filename } = await params
+  
+  if (!filename) {
+    return new NextResponse("Not Found", { status: 404 })
+  }
+
+  const sanitizedFilename = path.basename(filename)
+  const filePath = path.join(process.cwd(), "public", "uploads", "covers", sanitizedFilename)
+
+  if (!fs.existsSync(filePath)) {
+    return new NextResponse("Not Found", { status: 404 })
+  }
+
+  try {
+    const fileBuffer = fs.readFileSync(filePath)
+    
+    const ext = path.extname(sanitizedFilename).toLowerCase()
+    let contentType = "image/jpeg"
+    if (ext === ".png") contentType = "image/png"
+    else if (ext === ".webp") contentType = "image/webp"
+    else if (ext === ".gif") contentType = "image/gif"
+    else if (ext === ".svg") contentType = "image/svg+xml"
+
+    return new NextResponse(fileBuffer, {
+      headers: {
+        "Content-Type": contentType,
+        "Cache-Control": "public, max-age=86400",
+      },
+    })
+  } catch (error) {
+    return new NextResponse("Internal Server Error", { status: 500 })
+  }
+}