213 lines
6.9 KiB
Python
213 lines
6.9 KiB
Python
"""Flow models"""
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from typing import TYPE_CHECKING, Optional, Type
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from uuid import uuid4
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from django.db import models
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from django.forms import ModelForm
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from django.http import HttpRequest
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from django.utils.translation import gettext_lazy as _
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from model_utils.managers import InheritanceManager
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from rest_framework.serializers import BaseSerializer
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from structlog import get_logger
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from passbook.lib.models import InheritanceForeignKey, SerializerModel
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from passbook.policies.models import PolicyBindingModel
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if TYPE_CHECKING:
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from passbook.flows.stage import StageView
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LOGGER = get_logger()
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class NotConfiguredAction(models.TextChoices):
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"""Decides how the FlowExecutor should proceed when a stage isn't configured"""
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SKIP = "skip"
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# CONFIGURE = "configure"
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class FlowDesignation(models.TextChoices):
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"""Designation of what a Flow should be used for. At a later point, this
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should be replaced by a database entry."""
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AUTHENTICATION = "authentication"
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AUTHORIZATION = "authorization"
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INVALIDATION = "invalidation"
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ENROLLMENT = "enrollment"
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UNRENOLLMENT = "unenrollment"
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RECOVERY = "recovery"
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STAGE_CONFIGURATION = "stage_configuration"
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class Stage(SerializerModel):
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"""Stage is an instance of a component used in a flow. This can verify the user,
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enroll the user or offer a way of recovery"""
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stage_uuid = models.UUIDField(primary_key=True, editable=False, default=uuid4)
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name = models.TextField(unique=True)
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objects = InheritanceManager()
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@property
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def type(self) -> Type["StageView"]:
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"""Return StageView class that implements logic for this stage"""
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# This is a bit of a workaround, since we can't set class methods with setattr
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if hasattr(self, "__in_memory_type"):
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return getattr(self, "__in_memory_type")
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raise NotImplementedError
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@property
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def form(self) -> Type[ModelForm]:
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"""Return Form class used to edit this object"""
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raise NotImplementedError
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@property
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def ui_user_settings(self) -> Optional[str]:
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"""Entrypoint to integrate with User settings. Can either return None if no
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user settings are available, or a string with the URL to fetch."""
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return None
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def __str__(self):
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if hasattr(self, "__in_memory_type"):
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return f"In-memory Stage {getattr(self, '__in_memory_type')}"
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return f"Stage {self.name}"
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def in_memory_stage(view: Type["StageView"]) -> Stage:
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"""Creates an in-memory stage instance, based on a `_type` as view."""
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stage = Stage()
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# Because we can't pickle a locally generated function,
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# we set the view as a separate property and reference a generic function
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# that returns that member
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setattr(stage, "__in_memory_type", view)
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return stage
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class Flow(SerializerModel, PolicyBindingModel):
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"""Flow describes how a series of Stages should be executed to authenticate/enroll/recover
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a user. Additionally, policies can be applied, to specify which users
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have access to this flow."""
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flow_uuid = models.UUIDField(primary_key=True, editable=False, default=uuid4)
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name = models.TextField()
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slug = models.SlugField(unique=True)
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title = models.TextField()
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designation = models.CharField(max_length=100, choices=FlowDesignation.choices)
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stages = models.ManyToManyField(Stage, through="FlowStageBinding", blank=True)
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@property
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def serializer(self) -> BaseSerializer:
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from passbook.flows.api import FlowSerializer
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return FlowSerializer
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@staticmethod
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def with_policy(request: HttpRequest, **flow_filter) -> Optional["Flow"]:
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"""Get a Flow by `**flow_filter` and check if the request from `request` can access it."""
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from passbook.policies.engine import PolicyEngine
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flows = Flow.objects.filter(**flow_filter).order_by("slug")
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for flow in flows:
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engine = PolicyEngine(flow, request.user, request)
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engine.build()
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result = engine.result
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if result.passing:
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LOGGER.debug("with_policy: flow passing", flow=flow)
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return flow
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LOGGER.warning(
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"with_policy: flow not passing", flow=flow, messages=result.messages
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)
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LOGGER.debug("with_policy: no flow found", filters=flow_filter)
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return None
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def related_flow(self, designation: str, request: HttpRequest) -> Optional["Flow"]:
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"""Get a related flow with `designation`. Currently this only queries
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Flows by `designation`, but will eventually use `self` for related lookups."""
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return Flow.with_policy(request, designation=designation)
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def __str__(self) -> str:
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return f"Flow {self.name} ({self.slug})"
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class Meta:
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verbose_name = _("Flow")
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verbose_name_plural = _("Flows")
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permissions = [
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("export_flow", "Can export a Flow"),
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]
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class FlowStageBinding(SerializerModel, PolicyBindingModel):
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"""Relationship between Flow and Stage. Order is required and unique for
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each flow-stage Binding. Additionally, policies can be specified, which determine if
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this Binding applies to the current user"""
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fsb_uuid = models.UUIDField(primary_key=True, editable=False, default=uuid4)
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target = models.ForeignKey("Flow", on_delete=models.CASCADE)
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stage = InheritanceForeignKey(Stage, on_delete=models.CASCADE)
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evaluate_on_plan = models.BooleanField(
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default=True,
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help_text=_(
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(
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"Evaluate policies during the Flow planning process. "
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"Disable this for input-based policies."
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)
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),
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)
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re_evaluate_policies = models.BooleanField(
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default=False,
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help_text=_("Evaluate policies when the Stage is present to the user."),
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)
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order = models.IntegerField()
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objects = InheritanceManager()
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@property
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def serializer(self) -> BaseSerializer:
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from passbook.flows.api import FlowStageBindingSerializer
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return FlowStageBindingSerializer
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def __str__(self) -> str:
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return f"{self.target} #{self.order} -> {self.stage}"
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class Meta:
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ordering = ["target", "order"]
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verbose_name = _("Flow Stage Binding")
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verbose_name_plural = _("Flow Stage Bindings")
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unique_together = (("target", "stage", "order"),)
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class ConfigurableStage(models.Model):
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"""Abstract base class for a Stage that can be configured by the enduser.
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The stage should create a default flow with the configure_stage designation during
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migration."""
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configure_flow = models.ForeignKey(
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Flow,
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on_delete=models.SET_NULL,
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null=True,
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blank=True,
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help_text=_(
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(
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"Flow used by an authenticated user to configure this Stage. "
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"If empty, user will not be able to configure this stage."
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)
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),
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)
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class Meta:
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abstract = True
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