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A declarative, extensible framework for building Elixir applications.

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ash lib ash policy check.ex
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lib/ash/policy/check.ex

defmodule Ash.Policy.Check do
@moduledoc """
A behaviour for declaring checks, which can be used to easily construct
authorization rules.
If a check can be expressed simply, i.e as a function of the actor, or the context of the request,
see `Ash.Policy.SimpleCheck` for an easy way to write that check.
If a check can be expressed with a filter statement, see `Ash.Policy.FilterCheck`
for an easy way to write that check.
"""
@type actor :: any
@type options :: Keyword.t()
@type authorizer :: Ash.Policy.Authorizer.t()
@type check_type :: :simple | :filter | :manual
@type ref :: {module(), Keyword.t()} | module()
defstruct [:check, :check_module, :check_opts, :type]
@doc false
def transform(%{check: {check_module, opts}} = policy) do
{:ok, %{policy | check_module: check_module, check_opts: opts}}
end
@type t :: %__MODULE__{}
@doc """
Strict checks should be cheap, and should never result in external calls (like database or domain)
It should return `{:ok, true}` if it can tell that the request is authorized, and `{:ok, false}` if
it can tell that it is not. If unsure, it should return `{:ok, :unknown}`
"""
@callback strict_check(actor(), authorizer(), options()) ::
{:ok, boolean | :unknown} | {:error, term}
@doc """
An optional callback, that allows the check to work with policies set to `access_type :filter`
Return a keyword list filter that will be applied to the query being made, and will scope the results to match the rule
"""
@callback auto_filter(actor(), authorizer(), options()) :: Keyword.t() | Ash.Expr.t()
@doc """
An optional callback, hat allows the check to work with policies set to `access_type :runtime`
Takes a list of records, and returns the subset of authorized records.
"""
@callback check(actor(), list(Ash.Resource.record()), map, options) ::
list(Ash.Resource.record())
@doc "Describe the check in human readable format, given the options"
@callback describe(options()) :: String.t()
@doc "Whether or not your check requires the original data of a changeset (if applicable)"
@callback requires_original_data?(actor(), options()) :: boolean()
@doc """
The type of the check
`:manual` checks must be written by hand as standard check modules
`:filter` checks can use `Ash.Policy.FilterCheck` for simplicity
`:simple` checks can use `Ash.Policy.SimpleCheck` for simplicity
"""
@callback type() :: check_type()
@optional_callbacks check: 4, auto_filter: 3
def defines_check?(module) do
:erlang.function_exported(module, :check, 4)
end
def defines_auto_filter?(module) do
:erlang.function_exported(module, :auto_filter, 3)
end
defmacro __using__(_opts) do
quote do
@behaviour Ash.Policy.Check
import Ash.Expr
require Ash.Query
def type, do: :manual
def requires_original_data?(_, _), do: false
defoverridable type: 0, requires_original_data?: 2
end
end
end