Update app.py

app.py

@@ -1,4 +1,5 @@
 import traceback
+import re
 from flask import Flask, render_template, Response, request, jsonify
 import base64
 import cv2
@@ -122,7 +123,9 @@ def process_frame():
         return jsonify({'error': str(e)}), 500
 
 
+# ─────────────────────────────────────────────
 #  NEW: USER REGISTRATION ROUTE
+# ─────────────────────────────────────────────
 @app.route('/register', methods=['POST'])
 def register():
     """
@@ -135,11 +138,11 @@ def register():
         name    = payload.get('name', '').strip()
         image_data = payload.get('image', '')
 
-        # Validate name
+        # Validate name 
+        if not name:
             return jsonify({'success': False, 'error': 'Name cannot be empty.'}), 400
 
         # Sanitize: allow only letters, digits, spaces, hyphens, underscores
-        import re
         if not re.match(r'^[\w\s\-]+$', name):
             return jsonify({'success': False,
                             'error': 'Name contains invalid characters. Use letters, numbers, spaces or hyphens.'}), 400
@@ -168,7 +171,7 @@ def register():
             return jsonify({'success': False,
                             'error': 'Multiple faces detected. Please make sure only you are in the frame.'}), 400
 
-        # Encode the detected face
+        # Encode the detected face 
         new_encoding = face_recognition.face_encodings(rgb_frame, face_locations)[0]
 
         # Check for duplicate (same person already registered)
@@ -180,7 +183,7 @@ def register():
                 return jsonify({'success': False,
                                 'error': f'This face is already registered as "{existing_name}".'}), 409
 
-        # --- Save image to dataset ---
+        # Save image to dataset 
         # Folder name uses underscores instead of spaces
         folder_name  = name.replace(' ', '_')
         person_dir   = DATASET_DIR / folder_name