account_service.py: 添加注册时用户名的非法字符过滤

app/account_service.py

@@ -19,6 +19,18 @@ def signup():
         # POST方法需判断是否注册成功，再根据结果返回不同的内容
         username = escape(request.form['username'])
         password = escape(request.form['password'])
+        #! 添加如下代码为了过滤注册时的非法字符
+        if len(username) > 20:
+            return '用户名过长'
+        # 正则匹配非法字符
+        check_useful = re.search(u'^[_a-zA-Z0-9\u4e00-\u9fa5]+$', username)
+        if not check_useful:
+            return '存在非法字符'
+        # 判断用户名是否和接口重名
+        if username in ["signup", "login", "logout", 
+                        "reset", "mark", "back", 
+                        "unfamiliar", "familiar", 'del']:
+            return '请勿与接口同名'
         
         available = check_username_availability(username)
         if not available: # 用户名不可用