1.
def dispatch(self, request, *args, **kwargs): """ `.dispatch()` is pretty much the same as Django's regular dispatch, but with extra hooks for startup, finalize, and exception handling. """ self.args = args self.kwargs = kwargs # 第一步，对request进行加工，其实是实例化一个Requst并传入一个对象列表 '''''' request = self.initialize_request(request, *args, **kwargs) self.request = request self.headers = self.default_response_headers # deprecate? try: #第二步， self.initial(request, *args, **kwargs) # 判断其请求方式并做不同的处理 # Get the appropriate handler method if request.method.lower() in self.http_method_names: handler = getattr(self, request.method.lower(), self.http_method_not_allowed) else: handler = self.http_method_not_allowed #执行method方法并返回response response = handler(request, *args, **kwargs) except Exception as exc: response = self.handle_exception(exc) self.response = self.finalize_response(request, response, *args, **kwargs) return self.response
2.
def initialize_request(self, request, *args, **kwargs): """ Returns the initial request object. """ parser_context = self.get_parser_context(request) return Request( request, parsers=self.get_parsers(), authenticators=self.get_authenticators(), negotiator=self.get_content_negotiator(), parser_context=parser_context )
3.
def get_authenticators(self): """ Instantiates and returns the list of authenticators that this view can use. """ return [auth() for auth in self.authentication_classes]
4.自定义类，可以重写authentication_classes
class HostView(APIView): authentication_classes=[] def get(self,request,*args,**kwargs): # 原来request对象，django.core.handlers.wsgi.WSGIRequest # 现在的request对象，rest_framework.request.Request self.dispatch print(request.user) print(request.auth) return Response('主机列表')
5.
def initial(self, request, *args, **kwargs): """ Runs anything that needs to occur prior to calling the method handler. """ self.format_kwarg = self.get_format_suffix(**kwargs) # Perform content negotiation and store the accepted info on the request neg = self.perform_content_negotiation(request) request.accepted_renderer, request.accepted_media_type = neg #版本处理 # Determine the API version, if versioning is in use. version, scheme = self.determine_version(request, *args, **kwargs) request.version, request.versioning_scheme = version, scheme #权限认证 # Ensure that the incoming request is permitted self.perform_authentication(request) self.check_permissions(request) self.check_throttles(request)
6.
def perform_authentication(self, request): """ Perform authentication on the incoming request. Note that if you override this and simply 'pass', then authentication will instead be performed lazily, the first time either `request.user` or `request.auth` is accessed. """ request.user
7.执行Request类中的user属性
@property def user(self): """ Returns the user associated with the current request, as authenticated by the authentication classes provided to the request. """ if not hasattr(self, '_user'): with wrap_attributeerrors(): self._authenticate() return self._user
8.
def _authenticate(self): """ Attempt to authenticate the request using each authentication instance in turn. """ #循环对象列表 for authenticator in self.authenticators: try: #返回一个元祖(self.force_user, self.force_token) user_auth_tuple = authenticator.authenticate(self) except exceptions.APIException: self._not_authenticated() raise if user_auth_tuple is not None: self._authenticator = authenticator self.user, self.auth = user_auth_tuple return self._not_authenticated()
9.
class MyBasicAuthentication(BasicAuthentication): def authenticate_credentials(self, userid, password, request=None): if userid == 'alex' and password == '123': return ('alex','authaaaaaaaaaaaa') raise APIException('认证失败')