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lib/request.ex
defmodule Request.Validator do
@doc ~S"""
Get the validation rules that apply to the request.
"""
@callback rules(Plug.Conn.t()) :: Norm.Core.Schema.t()
@doc ~S"""
Determine if the user is authorized to make this request.
```elixir
def authorize(conn) do
user(conn).is_admin
end
```
"""
@callback authorize(Plug.Conn.t()) :: boolean()
defmacro __using__(_) do
quote do
use Norm
import Request.Validator.Rules
import Request.Validator.Helper
@before_compile Request.Validator
@behaviour Request.Validator
end
end
defmacro __before_compile__(_) do
mod = __CALLER__.module
quote bind_quoted: [mod: mod] do
if not Module.defines?(mod, {:authorize, 1}) do
def authorize(_), do: true
end
end
end
end