Question

我正在尝试按照github上的代码示例制作一个简单的Flask登录服务器。它非常适合程序中的用户，但是如果输入了错误的用户名，则会显示500 Internal server error。任何建议都很棒：）

@app.route('/login', methods=['GET', 'POST'])
def login():
    if flask.request.method == 'GET':
        return '''
               <form action='login' method='POST'>
                <input type='text' name='email' id='username' placeholder='email'/>
                <input type='password' name='password' id='password' placeholder='password'/>
                <input type='submit' name='submit'/>
               </form>
               '''
               #return render_template('logins.html')
    # if request.method == 'POST':
        # username = request.form['username']
        # password = request.form['password']

    email = flask.request.form['email']
    if flask.request.form['password'] == users[email]['password']:
        user = User()
        user.id = email
        flask_login.login_user(user)
        return flask.redirect(flask.url_for('protected'))
    return 'Bad login'



    Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1820, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.5/dist-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1949, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.5/dist-packages/flask/app.py", line 1935, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "serv.py", line 65, in login
    if flask.request.form['password'] == users[email]['password']:
KeyError: 's'

Answer 1

请编辑您的问题以添加错误回溯和代码，以确保完整性。

根据您提到的行为，我可能会有一个粗略的推测。您应该具有user_loader回调函数，该函数用于在使用login_user(user)之前获取用户。根据您的实现，此功能可能是从数据库或从内存字典或列表中加载用户

如果您是从字典中加载的，那么很可能没有异常处理，以防实例中不存在用户，您的代码应如下所示。

@login_manager.user_loader
def load_user(userid):
    try:
        user = users[userid]
        return user
    except KeyError:
        return None

上面的代码处理异常，并在用户不存在的情况下返回None。因此，flask-login可以决定不登录用户，而程序不会返回错误。

Flask-Login未注册用户给出500错误

1 个答案: