Fix upload size limit

app/upload/file_handler.py

@@ -73,7 +73,7 @@ class FileUploadHandler:
             file.seek(0)
             
             if not validate_file_size(file_size):
-                max_size_mb = current_app.config.get('MAX_CONTENT_LENGTH', 500 * 1024 * 1024) // (1024 * 1024)
+                max_size_mb = current_app.config.get('MAX_CONTENT_LENGTH', 5 * 1024 * 1024 * 1024)
                 return False, f"File too large. Maximum size: {max_size_mb}MB"
             
             return True, None
@@ -613,4 +613,4 @@ def get_file_upload_handler():
     global file_upload_handler
     if file_upload_handler is None:
         file_upload_handler = FileUploadHandler()
-    return file_upload_handler
+    return file_upload_handler
\ No newline at end of file

app/utils/security.py

@@ -304,10 +304,10 @@ def validate_file_size(file_size, max_size=None):
 def detect_malicious_content(file_path):
     """
     Basic malicious content detection
-    
+
     Args:
         file_path: Path to file to check
-    
+
     Returns:
         bool: True if potentially malicious content detected
     """
@@ -315,7 +315,9 @@ def detect_malicious_content(file_path):
         # Check file size (extremely large files might be suspicious)
         import os
         file_size = os.path.getsize(file_path)
-        if file_size > 1024 * 1024 * 1024:  # 1GB
+        # Allow up to 5GB for ZIP files (configurable)
+        max_safe_size = current_app.config.get('MAX_CONTENT_LENGTH', 5 * 1024 * 1024 * 1024)
+        if file_size > max_safe_size:
             return True
         
         # Check for executable signatures in first few bytes