79 lines
2.5 KiB
Python
79 lines
2.5 KiB
Python
"""passbook policy task"""
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from multiprocessing import Process
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from multiprocessing.connection import Connection
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from typing import Optional
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from django.core.cache import cache
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from structlog import get_logger
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from passbook.policies.exceptions import PolicyException
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from passbook.policies.models import PolicyBinding
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from passbook.policies.types import PolicyRequest, PolicyResult
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LOGGER = get_logger()
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def cache_key(binding: PolicyBinding, request: PolicyRequest) -> str:
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"""Generate Cache key for policy"""
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prefix = f"policy_{binding.policy_binding_uuid.hex}_{binding.policy.pk.hex}"
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if request.http_request:
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prefix += f"_{request.http_request.session.session_key}"
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if request.user:
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prefix += f"#{request.user.pk}"
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return prefix
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class PolicyProcess(Process):
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"""Evaluate a single policy within a seprate process"""
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connection: Connection
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binding: PolicyBinding
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request: PolicyRequest
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def __init__(
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self,
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binding: PolicyBinding,
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request: PolicyRequest,
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connection: Optional[Connection],
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):
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super().__init__()
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self.binding = binding
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self.request = request
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if not isinstance(self.request, PolicyRequest):
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raise ValueError(f"{self.request} is not a Policy Request.")
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if connection:
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self.connection = connection
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def execute(self) -> PolicyResult:
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"""Run actual policy, returns result"""
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LOGGER.debug(
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"P_ENG(proc): Running policy",
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policy=self.binding.policy,
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user=self.request.user,
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process="PolicyProcess",
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)
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try:
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policy_result = self.binding.policy.passes(self.request)
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except PolicyException as exc:
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LOGGER.debug("P_ENG(proc): error", exc=exc)
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policy_result = PolicyResult(False, str(exc))
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# Invert result if policy.negate is set
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if self.binding.negate:
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policy_result.passing = not policy_result.passing
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LOGGER.debug(
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"P_ENG(proc): Finished",
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policy=self.binding.policy,
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result=policy_result,
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process="PolicyProcess",
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passing=policy_result.passing,
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user=self.request.user,
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)
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key = cache_key(self.binding, self.request)
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cache.set(key, policy_result)
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LOGGER.debug("P_ENG(proc): Cached policy evaluation", key=key)
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return policy_result
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def run(self):
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"""Task wrapper to run policy checking"""
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self.connection.send(self.execute())
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