我有一个Django应用程序,从外部源码完全获取数据(通过HTTP查询).也就是说,我没有本地数据库的选项.会话数据存储在缓存中(在我的开发服务器上我使用一个sqlite数据库,这样就没有错误源).我正在使用流血的Django 1.1svn.
输入问题：我想为用户使用Django自己的身份验证系统.
编写自己的身份验证后端似乎很简单,但总是在您有一个本地数据库保存用户的条件下.没有数据库我的主要问题是持久性.
我尝试以下(假设datasource.get()是一个函数返回某种类型的dict)：
class ModelBackend (object):
"""Login backend."""
def authenticate (self,username=None,password=None):
"""Check,if a given user/password combination is valid"""
data = datasource.get ('login',username,password)
if data and data['ok']:
return MyUser (username=username)
else:
raise TypeError
return None
def get_user (self,username):
"""get data about a specific user"""
try:
data = datasource.get ('userdata',username)
if data and data['ok']:
return data.user
except:
pass
return None
class MyUser (User):
"""Django user who isn't saved in DB"""
def save (self):
return None
但是,MyUser上有意缺少的save()方法似乎打破了登录的会话存储.
MyUser如何看起来像没有本地数据库？
解决方法
好的,这比我想象的要复杂得多.首先,从
http://docs.djangoproject.com/en/dev/howto/auth-remote-user/开始,但是您需要使用自己的后端和用户进行扩展.
from django.contrib.auth.backends import RemoteUserBackend
class MyRemoteUserBackend (RemoteUserBackend):
# Create a User object if not already in the database?
create_unknown_user = False
def get_user (self,user_id):
user = somehow_create_an_instance_of (MyUser,user_id)
return user
def authenticate (self,**credentials):
check_credentials ()
user = somehow_create_an_instance_of (MyUser,credentials)
return user
然后用户：
from django.contrib.auth.models import User
class MyUser (User):
def save (self):
"""saving to DB disabled"""
pass
objects = None # we cannot really use this w/o local DB
username = "" # and all the other properties likewise.
# They're defined as model.CharField or similar,# and we can't allow that
def get_group_permissions (self):
"""If you don't make your own permissions module,the default also will use the DB. Throw it away"""
return [] # likewise with the other permission defs
def get_and_delete_messages (self):
"""Messages are stored in the DB. Darn!"""
return []
唷！ Django真的不是没有数据库的使用而设计的…
