问题描述
如果用户单击登录名，则在主页上为用户创建登录名，然后显示登录页面。如果电子邮件名和密码正确，则在其中输入电子邮件名和密码，然后将用户重定向到主页。现在的问题是用户登录的密码是错误还是正确，而另一个问题是如果我打印user.check_password(form.password.data)，那么它将返回false。我不明白问题是什么。我有config.json，并且在那里定义了参数，所以不用担心。 set_password(self,password)可以正常工作并存储在数据库中，除了检查密码外，其他一切都很好。这是我的python代码。
local_server=True
app=Flask(__name__)
app.secret_key='supper-secret-key'
login_manager=LoginManager(app)
login_manager.init_app(app)
login_manager.session_protection="strong"
db = sqlAlchemy(app)
class Users(UserMixin,db.Model):
__tablename__='users'
user_id=db.Column(db.Integer,primary_key=True)
first_name=db.Column(db.String(80),nullable=False)
last_name=db.Column(db.String(80),nullable=False)
email=db.Column(db.String(80),nullable=False)
password_hash=db.Column(db.String(255),nullable=False)
def get_id(self):
return self.user_id
def set_password(self,password):
self.password_hash = generate_password_hash(password)
def check_password(self,password):
return check_password_hash(self.password_hash,password)
class LoginForm(FlaskForm):
email=StringField('email',validators=[Datarequired()])
password=PasswordField('password',validators=[Datarequired()])
remember_me=BooleanField('Remember me')
submit=SubmitField('login')
@login_manager.user_loader
def load_user(user_id):
return Users.query.get(int(user_id))
@app.route("/")
def home():
return render_template("index.html",params=params)
def is_safe_url(target):
ref_url=urlparse(request.host_url,target)
test_url = urlparse(urljoin(request.host_url,target))
return test_url.scheme in ('http','https') and \
ref_url.netloc==test_url.netloc
@app.route("/login",methods=['POST','GET'])
def login():
if current_user.is_authenticated:
return render_template('index.html',params=params)
form=LoginForm()
if form.validate_on_submit():
user=Users.query.filter_by(email=form.email.data).first()
user.check_password(form.password.data)
if not user:
flash('Please check login details and try again','danger')
return redirect(url_for('login'))
print(user.check_password(form.password.data)) #False
flash('Successfully logged in','success')
login_user(user,remember=form.remember_me.data)
next=flask.request.args.get('next')
if not is_safe_url(next):
return flask.abort(400)
return flask.redirect(next or flask.url_for('home'))
return render_template("login.html",params=params,form=form)
@app.route("/logout")
def logout():
logout_user()
flash('You were logged out','warning')
return redirect(url_for('home'))
@app.route("/register")
def register():
if current_user.is_authenticated:
return render_template('index.html',params=params)
return render_template('register.html',params=params)
@app.route("/register",methods=['GET','POST'])
def register_post():
first_name = request.form.get('fname')
last_name = request.form.get('lname')
email = request.form.get('email')
password= request.form.get('password')
password2=request.form.get('cpassword')
if (password!=password2):
flash('Password must be same','danger')
return render_template('register.html',params=params)
users=Users.query.filter_by(email=email).first()
if users:
flash('Email address already exists','warning')
return redirect(url_for('register'))
new_user=Users(first_name=first_name,last_name=last_name,email=email)
new_user.set_password(password)
db.session.add(new_user)
db.session.commit()
return redirect(url_for('login'))
app.run(debug=True)
我还有一个错误如果我输入了错误的电子邮件ID，则错误为AttributeError: 'nonetype' object has no attribute 'check_password'
这是完整的错误代码
File "C:\python38\Lib\site-packages\flask\app.py",line 2464,in __call__
return self.wsgi_app(environ,start_response)
File "C:\python38\Lib\site-packages\flask\app.py",line 2450,in wsgi_app
response = self.handle_exception(e)
File "C:\python38\Lib\site-packages\flask\app.py",line 1867,in handle_exception
reraise(exc_type,exc_value,tb)
File "C:\python38\Lib\site-packages\flask\_compat.py",line 39,in reraise
raise value
File "C:\python38\Lib\site-packages\flask\app.py",line 2447,in wsgi_app
response = self.full_dispatch_request()
File "C:\python38\Lib\site-packages\flask\app.py",line 1952,in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\python38\Lib\site-packages\flask\app.py",line 1821,in handle_user_exception
reraise(exc_type,line 1950,in full_dispatch_request
rv = self.dispatch_request()
File "C:\python38\Lib\site-packages\flask\app.py",line 1936,in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "D:\tuts\PythonFlask\ThirdFlask.py",line 134,in login
user.check_password(form.password.data)
AttributeError: 'nonetype' object has no attribute 'check_password'
这是login.html的代码
{% extends "layout.html" %}
{% block body %}
<form method="POST" action="/login">
<div class="overlay"></div>
<div class="container">
<div class="row">
<div class="card" style="margin: auto; margin-top: 100px; width: 25rem;">
<!--message flashing started here-->
{% with messages = get_flashed_messages(with_categories=true) %}
{% if messages%}
{% for category,message in messages%}
<div class="alert alert-{{category}} alert-dismissible fade show" role="alert">
{{message}}
<button type="button" class="close" data-dismiss="alert" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
{% endfor %}
{% endif %}
{% endwith %}
<div class="card-body">
<form class="form" method="POST" action="/login">
{{ form.csrf_token }}
{{ form.name }}
<label>Email</label><br>
<input type="email" class="form-control" name="email" placeholder="email" required><br>
<label>Password</label><br>
<input type="password" class="form-control" name="password" placeholder="password" required><br><br>
<div class="checkBox mb-3">
<label>
<input type="checkBox" value="remember_me"> Remember me
</label>
</div>
<input type="submit" class="btn btn-primary btn-block btn-lg" value="login">
</form>
<p>Not a member? <a href="/register">Create Account</a></p>
</div>
</div>
</div>
</div>
<!-- Main Content -->
{% endblock %}
帮我解决这个问题，在此先感谢：）
解决方法
您需要重新排列：
@app.route("/login",methods=['POST','GET'])
def login():
if current_user.is_authenticated:
return render_template('index.html',params=params)
form=LoginForm()
if form.validate_on_submit():
user=Users.query.filter_by(email=form.email.data).first()
# dont check password if user with that email does not exist
if not user:
flash('Please check login details and try again','danger')
return redirect(url_for('login'))
if user.check_password(form.password.data):
flash('Successfully logged in','success')
login_user(user,remember=form.remember_me.data)
next=flask.request.args.get('next')
if not is_safe_url(next):
return flask.abort(400)
return flask.redirect(next or flask.url_for('home'))
else:
flash('incorrect password','fail')
return render_template("login.html",params=params,form=form)