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我正在製作一個基本的網頁，它有一個註冊頁面和一個登錄頁面。我正在使用谷歌應用程序引擎，Python和HTML。這是我的用戶功能：如何使從數據庫檢索用戶的登錄功能？
class User(db.Model):
name = db.StringProperty(required=True)
pw_hash = db.StringProperty(required=True)
email = db.StringProperty()
@classmethod
def by_id(cls, uid):
return cls.get_by_id(uid, parent=users_key())
@classmethod
def by_name(cls, name):
u = cls.all().filter('name=', name).get()
return u
@classmethod
def register(cls, name, pw, email=None):
pw_hash = make_pw_hash(name, pw)
return cls(parent=users_key(),
name=name,
pw_hash=pw_hash,
email=email)
@classmethod
def login(cls, name, pw):
u = cls.by_name(name)
if u and valid_pw(name, pw, u.pw_hash):
return u
當我註冊新用戶時，我把它們放在數據庫中。它們被存儲在數據庫中：
class Register(Signup):
def done(self):
#make sure the user doesn't already exist
u = User.by_name(self.username)
if u:
msg = 'That user already exists.'
self.render('signup-form.html', error_username = msg)
else:
u = User.register(self.username, self.password, self.email)
u.put()
self.login(u)
self.redirect('/blog')
但是，當我用我的登錄功能，我無法從數據庫中檢索用戶使用的登錄功能。它說每次「登錄無效」：
class Login(BlogHandler):
def get(self):
self.render('login-form.html')
def post(self):
username = self.request.get('username')
password = self.request.get('password')
u = User.login(username, password)
if u:
self.login()
self.redirect('/blog')
else:
msg = 'Invalid login'
self.render('login-form.html', error = msg)
當我註冊時，它應該認識到用戶已經在數據庫中。不過，我每次都可以使用相同的憑據進行註冊。這是我的註冊處理程序：
class Signup(BlogHandler):
def get(self):
self.render("signup-form.html")
def post(self):
have_error = False
self.username = self.request.get('username')
self.password = self.request.get('password')
self.verify = self.request.get('verify')
self.email = self.request.get('email')
params = dict(username = self.username,
email = self.email)
if not valid_username(self.username):
params['error_username'] = "That's not a valid username."
have_error = True
if not valid_password(self.password):
params['error_password'] = "That wasn't a valid password."
have_error = True
elif self.password != self.verify:
params['error_verify'] = "Your passwords didn't match."
have_error = True
if not valid_email(self.email):
params['error_email'] = "That's not a valid email."
have_error = True
if have_error:
self.render('signup-form.html', **params)
else:
self.done()
def done(self, *a, **kw):
raise NotImplementedError
這裏是bloghandler功能，是所有其他功能的底線：
class BlogHandler(webapp2.RequestHandler):
def write(self, *a, **kw):
self.response.out.write(*a, **kw)
def render_str(self, template, **params):
params['user'] = self.user
return render_str(template, **params)
def render(self, template, **kw):
self.write(self.render_str(template, **kw))
def set_secure_cookie(self, name, val):
cookie_val = make_secure_val(val)
self.response.headers.add_header(
'Set-Cookie',
'%s=%s; Path=/' % (name, cookie_val))
def read_secure_cookie(self, name):
cookie_val = self.request.cookies.get(name)
return cookie_val and check_secure_val(cookie_val)
def login(self, user):
self.set_secure_cookie('user_id', str(user.key().id()))
def logout(self):
self.response.headers.add_header('Set-Cookie', 'user_id=; Path=/')
def initialize(self, *a, **kw):
webapp2.RequestHandler.initialize(self, *a, **kw)
uid = self.read_secure_cookie('user_id')
self.user = uid and User.by_id(int(uid))
這裏是鏈接到GitHub的：
https://github.com/keldavis/registration
以下是網站的鏈接：
registr ation-148718.appspot.com
如何讓我的註冊頁面識別已經創建的用戶？我該如何讓我的登錄頁面從數據庫中檢索我的用戶並執行有效的登錄？