44 lines
1.4 KiB
Python
44 lines
1.4 KiB
Python
"""passbook expression Policy Models"""
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from typing import Type
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from django.db import models
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from django.forms import ModelForm
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from django.utils.translation import gettext as _
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from rest_framework.serializers import BaseSerializer
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from passbook.policies.expression.evaluator import PolicyEvaluator
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from passbook.policies.models import Policy
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from passbook.policies.types import PolicyRequest, PolicyResult
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class ExpressionPolicy(Policy):
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"""Execute arbitrary Python code to implement custom checks and validation."""
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expression = models.TextField()
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@property
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def serializer(self) -> BaseSerializer:
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from passbook.policies.expression.api import ExpressionPolicySerializer
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return ExpressionPolicySerializer
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def form(self) -> Type[ModelForm]:
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from passbook.policies.expression.forms import ExpressionPolicyForm
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return ExpressionPolicyForm
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def passes(self, request: PolicyRequest) -> PolicyResult:
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"""Evaluate and render expression. Returns PolicyResult(false) on error."""
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evaluator = PolicyEvaluator(self.name)
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evaluator.set_policy_request(request)
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return evaluator.evaluate(self.expression)
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def save(self, *args, **kwargs):
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PolicyEvaluator(self.name).validate(self.expression)
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return super().save(*args, **kwargs)
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class Meta:
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verbose_name = _("Expression Policy")
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verbose_name_plural = _("Expression Policies")
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