flask-login的使用3

# coding=utf-8
import flask

app = flask.Flask(__name__)
app.secret_key = 'super secret string'

import flask_login

from flask_login import login_required

login_manager = flask_login.LoginManager()

login_manager.init_app(app)
users = {'foo@bar.tld': {'pw': 'secret'}}

class User(flask_login.UserMixin):
    pass
@login_manager.user_loader
def user_loader(email):
    if email not in users:
        return

    user = User()
    user.id = email
    return user

@login_manager.request_loader
def request_loader(request):
    email = request.form.get('email')
    if email not in users:
        return 

    user = User()
    user.id = email

    print ''
    user.is_authenticated = request.form['pw'] == users[email]['pw']
    return user

@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='email' placeholder='email'></input>
                <input type='password' name='pw' id='pw' placeholder='password'></input>
                <input type='submit' name='submit'></input>
               </form>
               '''
    email = flask.request.form['email']

    if email not in users:
        print '不存在'

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

    return 'Bad login'

@app.route('/protected')
@flask_login.login_required
def protected():
    return 'Logged in as: ' + flask_login.current_user.id

@app.route('/logout')
def logout():
    flask_login.logout_user()
    return 'Logged out'

@login_manager.unauthorized_handler         # 未登录将会被执行这个函数
def unauthorized_handler():
    return 'Unauthorized'

@app.route('/require')
@login_required
def require():
    return 'require'

if __name__ == '__main__':

    app.run(debug=True)