232 lines
8.9 KiB
Python
232 lines
8.9 KiB
Python
"""OAuth Callback Views"""
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from typing import Any, Dict, Optional
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from django.conf import settings
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from django.contrib import messages
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from django.http import Http404, HttpRequest, HttpResponse
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from django.shortcuts import redirect
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from django.urls import reverse
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from django.utils.translation import ugettext as _
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from django.views.generic import View
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from structlog import get_logger
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from passbook.audit.models import Event, EventAction
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from passbook.core.models import User
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from passbook.flows.models import Flow, in_memory_stage
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from passbook.flows.planner import (
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PLAN_CONTEXT_PENDING_USER,
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PLAN_CONTEXT_SSO,
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FlowPlanner,
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)
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from passbook.flows.views import SESSION_KEY_PLAN
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from passbook.lib.utils.urls import redirect_with_qs
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from passbook.policies.utils import delete_none_keys
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from passbook.sources.oauth.auth import AuthorizedServiceBackend
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from passbook.sources.oauth.models import OAuthSource, UserOAuthSourceConnection
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from passbook.sources.oauth.views.base import OAuthClientMixin
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from passbook.sources.oauth.views.flows import (
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PLAN_CONTEXT_SOURCES_OAUTH_ACCESS,
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PostUserEnrollmentStage,
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)
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from passbook.stages.password.stage import PLAN_CONTEXT_AUTHENTICATION_BACKEND
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from passbook.stages.prompt.stage import PLAN_CONTEXT_PROMPT
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LOGGER = get_logger()
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class OAuthCallback(OAuthClientMixin, View):
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"Base OAuth callback view."
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source_id = None
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source = None
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# pylint: disable=too-many-return-statements
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def get(self, request: HttpRequest, *_, **kwargs) -> HttpResponse:
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"""View Get handler"""
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slug = kwargs.get("source_slug", "")
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try:
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self.source = OAuthSource.objects.get(slug=slug)
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except OAuthSource.DoesNotExist:
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raise Http404(f"Unknown OAuth source '{slug}'.")
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if not self.source.enabled:
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raise Http404(f"Source {slug} is not enabled.")
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client = self.get_client(self.source)
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callback = self.get_callback_url(self.source)
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# Fetch access token
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token = client.get_access_token(self.request, callback=callback)
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if token is None:
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return self.handle_login_failure(self.source, "Could not retrieve token.")
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if "error" in token:
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return self.handle_login_failure(self.source, token["error"])
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# Fetch profile info
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info = client.get_profile_info(token)
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if info is None:
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return self.handle_login_failure(self.source, "Could not retrieve profile.")
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identifier = self.get_user_id(self.source, info)
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if identifier is None:
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return self.handle_login_failure(self.source, "Could not determine id.")
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# Get or create access record
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defaults = {
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"access_token": token.get("access_token"),
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}
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existing = UserOAuthSourceConnection.objects.filter(
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source=self.source, identifier=identifier
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)
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if existing.exists():
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connection = existing.first()
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connection.access_token = token.get("access_token")
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UserOAuthSourceConnection.objects.filter(pk=connection.pk).update(
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**defaults
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)
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else:
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connection = UserOAuthSourceConnection(
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source=self.source,
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identifier=identifier,
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access_token=token.get("access_token"),
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)
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user = AuthorizedServiceBackend().authenticate(
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source=self.source, identifier=identifier, request=request
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)
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if user is None:
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if self.request.user.is_authenticated:
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LOGGER.debug("Linking existing user", source=self.source)
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return self.handle_existing_user_link(self.source, connection, info)
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LOGGER.debug("Handling enrollment of new user", source=self.source)
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return self.handle_enroll(self.source, connection, info)
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LOGGER.debug("Handling existing user", source=self.source)
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return self.handle_existing_user(self.source, user, connection, info)
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# pylint: disable=unused-argument
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def get_callback_url(self, source: OAuthSource) -> str:
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"Return callback url if different than the current url."
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return ""
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# pylint: disable=unused-argument
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def get_error_redirect(self, source: OAuthSource, reason: str) -> str:
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"Return url to redirect on login failure."
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return settings.LOGIN_URL
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def get_user_enroll_context(
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self,
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source: OAuthSource,
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access: UserOAuthSourceConnection,
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info: Dict[str, Any],
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) -> Dict[str, Any]:
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"""Create a dict of User data"""
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raise NotImplementedError()
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# pylint: disable=unused-argument
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def get_user_id(
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self, source: UserOAuthSourceConnection, info: Dict[str, Any]
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) -> Optional[str]:
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"""Return unique identifier from the profile info."""
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if "id" in info:
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return info["id"]
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return None
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def handle_login_failure(self, source: OAuthSource, reason: str) -> HttpResponse:
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"Message user and redirect on error."
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LOGGER.warning("Authentication Failure", reason=reason)
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messages.error(self.request, _("Authentication Failed."))
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return redirect(self.get_error_redirect(source, reason))
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def handle_login_flow(self, flow: Flow, **kwargs) -> HttpResponse:
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"""Prepare Authentication Plan, redirect user FlowExecutor"""
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kwargs.update(
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{
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# Since we authenticate the user by their token, they have no backend set
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PLAN_CONTEXT_AUTHENTICATION_BACKEND: "django.contrib.auth.backends.ModelBackend",
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PLAN_CONTEXT_SSO: True,
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}
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)
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# We run the Flow planner here so we can pass the Pending user in the context
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planner = FlowPlanner(flow)
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plan = planner.plan(self.request, kwargs)
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self.request.session[SESSION_KEY_PLAN] = plan
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return redirect_with_qs(
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"passbook_flows:flow-executor-shell", self.request.GET, flow_slug=flow.slug,
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)
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# pylint: disable=unused-argument
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def handle_existing_user(
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self,
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source: OAuthSource,
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user: User,
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access: UserOAuthSourceConnection,
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info: Dict[str, Any],
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) -> HttpResponse:
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"Login user and redirect."
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messages.success(
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self.request,
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_(
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"Successfully authenticated with %(source)s!"
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% {"source": self.source.name}
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),
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)
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flow_kwargs = {PLAN_CONTEXT_PENDING_USER: user}
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return self.handle_login_flow(source.authentication_flow, **flow_kwargs)
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def handle_existing_user_link(
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self,
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source: OAuthSource,
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access: UserOAuthSourceConnection,
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info: Dict[str, Any],
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) -> HttpResponse:
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"""Handler when the user was already authenticated and linked an external source
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to their account."""
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# there's already a user logged in, just link them up
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user = self.request.user
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access.user = user
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access.save()
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UserOAuthSourceConnection.objects.filter(pk=access.pk).update(user=user)
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Event.new(
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EventAction.CUSTOM, message="Linked OAuth Source", source=source
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).from_http(self.request)
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messages.success(
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self.request,
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_("Successfully linked %(source)s!" % {"source": self.source.name}),
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)
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return redirect(
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reverse(
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"passbook_sources_oauth:oauth-client-user",
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kwargs={"source_slug": self.source.slug},
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)
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)
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def handle_enroll(
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self,
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source: OAuthSource,
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access: UserOAuthSourceConnection,
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info: Dict[str, Any],
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) -> HttpResponse:
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"""User was not authenticated and previous request was not authenticated."""
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messages.success(
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self.request,
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_(
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"Successfully authenticated with %(source)s!"
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% {"source": self.source.name}
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),
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)
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# Because we inject a stage into the planned flow, we can't use `self.handle_login_flow`
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context = {
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# Since we authenticate the user by their token, they have no backend set
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PLAN_CONTEXT_AUTHENTICATION_BACKEND: "django.contrib.auth.backends.ModelBackend",
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PLAN_CONTEXT_SSO: True,
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PLAN_CONTEXT_PROMPT: delete_none_keys(
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self.get_user_enroll_context(source, access, info)
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),
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PLAN_CONTEXT_SOURCES_OAUTH_ACCESS: access,
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}
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# We run the Flow planner here so we can pass the Pending user in the context
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planner = FlowPlanner(source.enrollment_flow)
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plan = planner.plan(self.request, context)
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plan.append(in_memory_stage(PostUserEnrollmentStage))
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self.request.session[SESSION_KEY_PLAN] = plan
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return redirect_with_qs(
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"passbook_flows:flow-executor-shell",
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self.request.GET,
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flow_slug=source.enrollment_flow.slug,
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)
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