Update app.py

app.py

@@ -46,17 +46,19 @@ def home():
 PROCESSED_PDF_PATH = "static/processed.pdf"
 
 def getpdfcontent(pdf_path):
-    # Optimized URL handling
+    # Handle Dropbox URLs
     if pdf_path and ('http' in pdf_path or 'dropbox' in pdf_path):
         pdf_path = pdf_path.replace('dl=0', 'dl=1')
 
-    # Cache frequently used values
+    # Get the PDF bytes
     response = requests.get(pdf_path)
-    pdf_content = BytesIO(response.content)
-    if not pdf_content:
+    pdf_bytes = response.content
+
+    if not pdf_bytes or not pdf_bytes.startswith(b"%PDF"):
         raise ValueError("No valid PDF content found.")
 
-    return pdf_content
+    # Convert to BytesIO only after validation
+    return BytesIO(pdf_bytes)
 
 @app.route('/view-pdf', methods=['GET'])
 def view_pdf():