delete duplicate caddy conf

Html/apps/views/vscode.py

@@ -1,4 +1,5 @@
 # myapp/views/vscode.py
+import re
 import os, uuid, json
 from flask import Blueprint, current_app, session, redirect, url_for, render_template, request, jsonify
 from ..services.backboard_service import realtime_response
@@ -39,21 +40,32 @@ def desktop(user_uuid, course_id, chapter_name, lesson_name):
     
 
 
-
     caddy_conf = f"""
         handle_path /vsc{user_uuid}/* {{
             reverse_proxy localhost:{code_server_port}
         }}
-
-
     """
     caddy_config_path = "/etc/caddy/Caddyfile"
     with open(caddy_config_path, "r") as f:
         lines = f.readlines()
-    insert_position = len(lines) - 2 if len(lines) >= 2 else len(lines)
+    pattern = re.compile(
+        r'handle_path\s+/vsc' + re.escape(user_uuid) + r'/\* {.*?reverse_proxy.*?}', 
+        re.DOTALL 
+    )
+    content = "".join(lines)
+    if pattern.search(content):
+        new_content = pattern.sub('', content)
+        lines = new_content.splitlines(keepends=True)
+    if len(lines) >= 2:
+        insert_position = len(lines) - 2
+    else:
+        insert_position = len(lines)
+    if caddy_conf[-1] not in ['\n', '\r']:
+        caddy_conf += '\n'
     lines.insert(insert_position, caddy_conf)
     with open(caddy_config_path, "w") as f:
         f.writelines(lines)
+        
     try:
         subprocess.run(["sudo", "caddy", "reload", "--config", "/etc/caddy/Caddyfile"])
     except subprocess.CalledProcessError as e: