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2020-06-05 10:00:27 +00:00
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# Expression Policies
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2020-06-05 18:18:11 +00:00
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!!! notice
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These variables are available in addition to the common variables/functions defined in [**Expressions**](../expressions/index.md)
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2020-06-05 10:00:27 +00:00
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The passing of the policy is determined by the return value of the code. Use `return True` to pass a policy and `return False` to fail it.
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### Available Functions
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#### `pb_message(message: str)`
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Add a message, visible by the end user. This can be used to show the reason why they were denied.
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Example:
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```python
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pb_message("Access denied")
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return False
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```
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### Context variables
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- `request`: A PolicyRequest object, which has the following properties:
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- `request.user`: The current User, which the Policy is applied against. ([ref](../expressions/reference/user-object.md))
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- `request.http_request`: The Django HTTP Request. ([ref](https://docs.djangoproject.com/en/3.0/ref/request-response/#httprequest-objects))
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- `request.obj`: A Django Model instance. This is only set if the Policy is ran against an object.
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- `request.context`: A dictionary with dynamic data. This depends on the origin of the execution.
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- `pb_is_sso_flow`: Boolean which is true if request was initiated by authenticating through an external Provider.
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- `pb_client_ip`: Client's IP Address or '255.255.255.255' if no IP Address could be extracted.
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- `pb_flow_plan`: Current Plan if Policy is called from the Flow Planner.
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