flask登录时出错 [英] Error with flask-login

问题描述

我很难使用Flask-Login框架进行身份验证.我已经尽可能详尽地浏览了文档，但显然我缺少明显的内容.

I have difficulty in using the Flask-Login framework for authentication. I have looked through the documentation as thoroughly as possible but apparently I am missing something obvious.

class User():
    def __init__(self, userid=None, username=None, password=None):
        self.userid = userid
        self.username = username
        self.password = password

    def is_authenticated(self):
        return True

    def is_active(self):
        return True

    def is_anonymous(self):
        return False

    def get_id(self):
        return unicode(self.userid)

    def __repr__(self):
        return '<User %r>' % self.username

def find_by_username(username):
    try:
        data = app.mongo.db.users.find_one_or_404({'username': username})

        user = User()
        user.userid = data['_id']
        user.username = data['username']
        user.password = data['password']
        return user

    except HTTPException:
        return None


def find_by_id(userid):
    try:
        data = app.mongo.db.users.find_one_or_404({'_id': userid})
        user = User(data['_id'], data['username'], data['password'])
        return user

    except HTTPException:
        return None

上面是我的User类，位于 users/models.py

The above is my User class located in users/models.py

login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'users.login'

@login_manager.user_loader
def load_user(userid):
return find_by_id(userid)

以上是我的用户加载程序.

The above is my user loader.

@mod.route('/login/', methods=['GET', 'POST'])
def login():
    form = LoginForm()
    if form.validate_on_submit():
        pw_hash = hashlib.md5(form.password.data).hexdigest()
        user = find_by_username(form.username.data)
        if user is not None:
            if user.password == pw_hash:
                if login_user(user):
                    flash('Logged in successfully.')
                    return redirect(request.args.get('next') or url_for('users.test'))
                else:
                    flash('Error')

        else:
            flash('Username or password incorrect')

    else:
        flash('Username or password incorrect')

return render_template('users/login.html', form=form)

显然没有错误消息，但是当尝试访问任何用 @login_required 装饰的视图时，它会将我重定向到登录表单.据我所知， login_user 函数实际上并不起作用，尽管在我调用它时会返回 True .任何建议表示赞赏.

There is no apparently error message, but when trying to access any views decorated with @login_required, it redirects me to the login form. Best as I can tell, the login_user function isn't actually working although it returns True when I called it. Any advice appreciated.

推荐答案

在调试器中调试了一段时间之后，我终于解决了这个问题.

After stepping through a debugger for a while, I finally fixed the problem.

关键问题是我试图将MongoDB集合中的 _id 参数用作用户ID.我没有意识到 _id 参数是 ObjectID 类型，而不是我需要的字符串或unicode.

The key issue is that I was attempting to use the _id parameter from the MongoDB collection as the userid. I did not realize that the _id parameter was an ObjectID type instead of a string or unicode which I needed.

def find_by_username(username):
    try:
        data = app.mongo.db.users.find_one_or_404({'username': username})

        user = User(unicode(data['_id']), data['username'], data['password'])
        return user

    except HTTPException:
        return None


def find_by_id(userid):
    try:
        data = app.mongo.db.users.find_one_or_404({'_id': ObjectId(userid)})
        user = User(unicode(data['_id']), data['username'], data['password'])
        return user

修改这两个函数可以适当地修复此错误.

Modifying the two functions appropriately fixed this error.

这篇关于flask登录时出错的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！