94 lines
3.5 KiB
Python
94 lines
3.5 KiB
Python
"""passbook access helper classes"""
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from typing import Any, Optional
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from django.contrib import messages
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from django.contrib.auth.mixins import AccessMixin
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from django.contrib.auth.views import redirect_to_login
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from django.http import HttpRequest, HttpResponse
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from django.utils.translation import gettext as _
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from django.views.generic.base import View
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from structlog import get_logger
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from passbook.core.models import Application, Provider, User
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from passbook.flows.views import SESSION_KEY_APPLICATION_PRE
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from passbook.policies.engine import PolicyEngine
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from passbook.policies.http import AccessDeniedResponse
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from passbook.policies.types import PolicyResult
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LOGGER = get_logger()
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class BaseMixin:
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"""Base Mixin class, used to annotate View Member variables"""
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request: HttpRequest
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class PolicyAccessView(AccessMixin, View):
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"""Mixin class for usage in Authorization views.
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Provider functions to check application access, etc"""
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provider: Provider
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application: Application
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def resolve_provider_application(self):
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"""Resolve self.provider and self.application. *.DoesNotExist Exceptions cause a normal
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AccessDenied view to be shown. An Http404 exception
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is not caught, and will return directly"""
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raise NotImplementedError
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def dispatch(self, request: HttpRequest, *args: Any, **kwargs: Any) -> HttpResponse:
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try:
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self.resolve_provider_application()
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except (Application.DoesNotExist, Provider.DoesNotExist):
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return self.handle_no_permission_authenticated()
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# Check if user is unauthenticated, so we pass the application
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# for the identification stage
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if not request.user.is_authenticated:
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return self.handle_no_permission()
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# Check permissions
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result = self.user_has_access()
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if not result.passing:
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return self.handle_no_permission_authenticated(result)
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return super().dispatch(request, *args, **kwargs)
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def handle_no_permission(self) -> HttpResponse:
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"""User has no access and is not authenticated, so we remember the application
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they try to access and redirect to the login URL. The application is saved to show
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a hint on the Identification Stage what the user should login for."""
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if self.application:
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self.request.session[SESSION_KEY_APPLICATION_PRE] = self.application
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return redirect_to_login(
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self.request.get_full_path(),
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self.get_login_url(),
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self.get_redirect_field_name(),
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)
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def handle_no_permission_authenticated(
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self, result: Optional[PolicyResult] = None
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) -> HttpResponse:
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"""Function called when user has no permissions but is authenticated"""
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response = AccessDeniedResponse(self.request)
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if result:
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response.policy_result = result
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return response
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def user_has_access(self, user: Optional[User] = None) -> PolicyResult:
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"""Check if user has access to application."""
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user = user or self.request.user
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policy_engine = PolicyEngine(
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self.application, user or self.request.user, self.request
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)
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policy_engine.build()
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result = policy_engine.result
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LOGGER.debug(
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"AccessMixin user_has_access",
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user=user,
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app=self.application,
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result=result,
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)
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if not result.passing:
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for message in result.messages:
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messages.error(self.request, _(message))
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return result
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