This repository has been archived on 2024-05-31. You can view files and clone it, but cannot push or open issues or pull requests.
authentik/docs/expressions/index.md

67 lines
1.9 KiB
Markdown

# Expressions
Expressions allow you to write custom logic using Python code.
Expressions are used in different places throughout passbook, and can do different things.
!!! info
These functions/objects are available wherever expressions are used. For more specific information, see [Expression Policies](../policies/expression.md) and [Property Mappings](../property-mappings/expression.md)
## Global objects
- `pb_logger`: structlog BoundLogger. ([ref](https://www.structlog.org/en/stable/api.html#structlog.BoundLogger))
- `requests`: requests Session object. ([ref](https://requests.readthedocs.io/en/master/user/advanced/))
## Generally available functions
### `regex_match(value: Any, regex: str) -> bool`
Check if `value` matches Regular Expression `regex`.
Example:
```python
return regex_match(request.user.username, '.*admin.*')
```
### `regex_replace(value: Any, regex: str, repl: str) -> str`
Replace anything matching `regex` within `value` with `repl` and return it.
Example:
```python
user_email_local = regex_replace(request.user.email, '(.+)@.+', '')
```
### `pb_is_group_member(user: User, **group_filters) -> bool`
Check if `user` is member of a group matching `**group_filters`.
Example:
```python
return pb_is_group_member(request.user, name="test_group")
```
### `pb_user_by(**filters) -> Optional[User]`
Fetch a user matching `**filters`. Returns "None" if no user was found.
Example:
```python
other_user = pb_user_by(username="other_user")
```
## Comparing IP Addresses
To compare IP Addresses or check if an IP Address is within a given subnet, you can use the functions `ip_address('192.0.2.1')` and `ip_network('192.0.2.0/24')`. With these objects you can do [arithmetic operations](https://docs.python.org/3/library/ipaddress.html#operators).
You can also check if an IP Address is within a subnet by writing the following:
```python
ip_address('192.0.2.1') in ip_network('192.0.2.0/24')
# evaluates to True
```