mirror of
https://github.com/encode/django-rest-framework.git
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119 lines
3.1 KiB
Python
119 lines
3.1 KiB
Python
from django.core.cache import cache
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from djangorestframework import status
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from djangorestframework.response import ErrorResponse
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import time
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__all__ = (
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'BasePermission',
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'FullAnonAccess',
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'IsAuthenticated',
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'IsAdminUser',
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'IsUserOrIsAnonReadOnly',
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'PerUserThrottling'
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)
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_403_FORBIDDEN_RESPONSE = ErrorResponse(
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status.HTTP_403_FORBIDDEN,
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{'detail': 'You do not have permission to access this resource. ' +
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'You may need to login or otherwise authenticate the request.'})
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_503_THROTTLED_RESPONSE = ErrorResponse(
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status.HTTP_503_SERVICE_UNAVAILABLE,
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{'detail': 'request was throttled'})
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class BasePermission(object):
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"""
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A base class from which all permission classes should inherit.
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"""
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def __init__(self, view):
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"""
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Permission classes are always passed the current view on creation.
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"""
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self.view = view
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def check_permission(self, auth):
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"""
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Should simply return, or raise an :class:`response.ErrorResponse`.
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"""
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pass
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class FullAnonAccess(BasePermission):
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"""
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Allows full access.
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"""
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def check_permission(self, user):
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pass
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class IsAuthenticated(BasePermission):
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"""
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Allows access only to authenticated users.
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"""
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def check_permission(self, user):
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if not user.is_authenticated():
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raise _403_FORBIDDEN_RESPONSE
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class IsAdminUser(BasePermission):
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"""
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Allows access only to admin users.
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"""
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def check_permission(self, user):
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if not user.is_admin():
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raise _403_FORBIDDEN_RESPONSE
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class IsUserOrIsAnonReadOnly(BasePermission):
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"""
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The request is authenticated as a user, or is a read-only request.
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"""
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def check_permission(self, user):
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if (not user.is_authenticated() and
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self.view.method != 'GET' and
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self.view.method != 'HEAD'):
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raise _403_FORBIDDEN_RESPONSE
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class PerUserThrottling(BasePermission):
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"""
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Rate throttling of requests on a per-user basis.
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The rate (requests / seconds) is set by a :attr:`throttle` attribute on the ``View`` class.
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The attribute is a two tuple of the form (number of requests, duration in seconds).
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The user id will be used as a unique identifier if the user is authenticated.
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For anonymous requests, the IP address of the client will be used.
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Previous request information used for throttling is stored in the cache.
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"""
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def check_permission(self, user):
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(num_requests, duration) = getattr(self.view, 'throttle', (0, 0))
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if user.is_authenticated():
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ident = str(auth)
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else:
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ident = self.view.request.META.get('REMOTE_ADDR', None)
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key = 'throttle_%s' % ident
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history = cache.get(key, [])
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now = time.time()
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# Drop any requests from the history which have now passed the throttle duration
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while history and history[0] < now - duration:
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history.pop()
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if len(history) >= num_requests:
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raise _503_THROTTLED_RESPONSE
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history.insert(0, now)
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cache.set(key, history, duration)
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