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')
