refactor: Simplify message deletion logic and improve response handling in DiscordRateLimiter

src/app/api/delete/route.ts

@@ -50,20 +50,18 @@ export async function POST(request: Request) {
       );
 
       // 3. Delete each message from Discord sequentially to avoid rate limits
-      for (const part of partsRows[0] as FilePart[]) {
+      for (const part of partsRows as FilePart[]) {
         if (!part.discord_message_id) continue;
 
         try {
-          const res: Response = await rateLimiter.request(
+          await rateLimiter.request(
             `/channels/${process.env.DISCORD_CHANNEL_ID}/messages/${part.discord_message_id}`,
             {
               method: 'DELETE',
             }
           );
-
-          if (!res.ok && res.status !== 404) { // Don't warn on 404 (already deleted)
-            console.warn(`Failed to delete message ${part.discord_message_id}. Status: ${res.status}`);
-          }
+          // No need to check res.ok or res.status here, as rateLimiter.request throws on !response.ok
+          // and returns null for 204.
         } catch (e) {
           console.error(`Error deleting message ${part.discord_message_id}:`, e);
         }

src/app/api/file/[file_id]/route.ts

@@ -64,7 +64,7 @@ export async function GET(request: NextRequest, context: RouteContext) {
         filename: file.filename,
         size: file.size,
         num_parts: file.num_parts,
-        parts: partsRows[0] as FilePartMetadata[],
+        parts: partsRows as FilePartMetadata[],
       };
 
       return NextResponse.json(response);

src/app/api/upload-part/route.ts

@@ -10,6 +10,15 @@ if (!process.env.DISCORD_BOT_TOKEN || !process.env.DISCORD_CHANNEL_ID) {
 
 const rateLimiter = new DiscordRateLimiter(DISCORD_API_BASE_URL, process.env.DISCORD_BOT_TOKEN);
 
+interface DiscordMessageResponse {
+  id: string;
+  attachments: Array<{
+    id: string;
+    url: string;
+    size: number;
+  }>;
+}
+
 export async function POST(request: Request) {
   try {
     const formData = await request.formData();
@@ -25,21 +34,13 @@ export async function POST(request: Request) {
     const discordFormData = new FormData();
     discordFormData.append('file', chunk, `chunk-${partIndex}.bin`);
 
-    const discordRes: Response = await rateLimiter.request(
+    const discordData = await rateLimiter.request<DiscordMessageResponse>(
       `/channels/${process.env.DISCORD_CHANNEL_ID}/messages`,
       {
         method: 'POST',
         body: discordFormData,
       }
     );
-
-    if (!discordRes.ok) {
-      const errorBody = await discordRes.json();
-      console.error('Discord API Error:', errorBody);
-      return NextResponse.json({ error: 'Failed to upload to Discord' }, { status: 500 });
-    }
-
-    const discordData = await discordRes.json();
     const attachment = discordData.attachments[0];
 
     if (!attachment) {

src/app/download/[file_id]/page.tsx

@@ -100,17 +100,28 @@ export default function DownloadPage() {
 
             try {
                 const metaRes = await fetch(`/api/file/${file_id}?token=${token}`);
-                if (!metaRes.ok) {
-                    const err = await metaRes.json();
-                    throw new Error(err.error || 'Failed to fetch file metadata.');
+                let metadata;
+                try {
+                    metadata = await metaRes.json();
+                } catch (jsonError) {
+                    console.error('Failed to parse metadata response as JSON:', jsonError);
+                    throw new Error('Failed to parse file metadata.');
                 }
-                const metadata = await metaRes.json();
+
+                if (!metaRes.ok) {
+                    throw new Error(metadata.error || 'Failed to fetch file metadata.');
+                }
+                
                 setFilename(metadata.filename);
                 setTotalBytes(metadata.size);
 
                 setDownloadState('downloading');
                 const encryptedParts = new Array(metadata.num_parts);
 
+                if (!Array.isArray(metadata.parts)) {
+                    throw new Error('Invalid metadata: parts is not an array.');
+                }
+
                 const downloadPromises = metadata.parts.map(async (part: MetadataPart) => {
                     const response = await fetchWithRetry(`/api/download-part/${file_id}/${part.part_index}`);
                     const buffer = await response.arrayBuffer();

src/lib/discordRateLimiter.ts

@@ -45,6 +45,9 @@ export class DiscordRateLimiter {
       throw new Error(`Discord API error: ${response.status} - ${errorData.message || JSON.stringify(errorData)}`);
     }
 
+    if (response.status === 204) {
+      return null as T; // Return null for 204 No Content
+    }
     return response.json() as Promise<T>;
   }
 }