feat: add debug directory (#1409)

src/lib/misc/ErrorHandler.tsx

@@ -1,6 +1,11 @@
 import express from 'express';
 import { renderToStaticMarkup } from 'react-dom/server';
 import { sendError } from '../error/sendError';
+import { UploadedFile } from '../storage/types';
+import path from 'path';
+import os from 'os';
+import { getRandomUUID } from '../../shared/helpers/getRandomUUID';
+import fs from 'fs';
 
 export const NO_PACKAGE_ERROR = new Error(
   renderToStaticMarkup(
@@ -20,8 +25,44 @@ export const NO_PACKAGE_ERROR = new Error(
   )
 );
 
-export default function ErrorHandler(res: express.Response, err: Error) {
+function perserveFilesForDebugging(uploadedFiles: UploadedFile[]) {
+  const debugDirectory = path.join(os.tmpdir(), 'debug', getRandomUUID());
+
+  if (!fs.existsSync(debugDirectory)) {
+    try {
+      fs.mkdirSync(debugDirectory, { recursive: true });
+      console.log(`Created debug directory: ${debugDirectory}`);
+    } catch (error) {
+      console.error(`Failed to create debug directory: ${error}`);
+      return;
+    }
+  }
+
+  uploadedFiles.forEach((file, index) => {
+    try {
+      const destPath = `${debugDirectory}/${index}-${path.basename(
+        file.originalname
+      )}`;
+      const fileContents = fs.readFileSync(file.path);
+      fs.writeFileSync(destPath, fileContents);
+      console.log(`Copied file ${file.path} to ${destPath}`);
+    } catch (error) {
+      console.error(`Error copying file ${file.path}: ${error}`);
+    }
+  });
+}
+
+export default function ErrorHandler(
+  res: express.Response,
+  req: express.Request,
+  err: Error
+) {
   sendError(err);
+
+  if (Array.isArray(req.files) && req.files.length > 0) {
+    perserveFilesForDebugging(req.files as UploadedFile[]);
+  }
+
   res.set('Content-Type', 'text/plain');
   res.status(400).send(err.message);
 }

src/server.ts

@@ -96,14 +96,14 @@ const serve = async () => {
   app.use(
     (
       err: Error,
-      _req: express.Request,
+      req: express.Request,
       res: express.Response,
       next: () => void
     ) => {
       if (!err) {
         next();
       } else {
-        ErrorHandler(res, err);
+        ErrorHandler(res, req, err);
       }
     }
   );

src/services/UploadService.ts

@@ -71,11 +71,11 @@ class UploadService {
         res.status(300);
         return res.redirect(url);
       } else {
-        ErrorHandler(res, NO_PACKAGE_ERROR);
+        ErrorHandler(res, req, NO_PACKAGE_ERROR);
       }
     } catch (err) {
       sendError(err);
-      ErrorHandler(res, err as Error);
+      ErrorHandler(res, req, err as Error);
     }
   }
 }