defmodule Pow.Config do
@moduledoc """
Methods to parse and modify configurations.
"""
@type t :: Keyword.t()
defmodule ConfigError do
@moduledoc false
defexception [:message]
end
@doc """
Gets the key value from the configuration.
If not found, it'll fall back to environment config, and lastly to the
default value which is `nil` if not specified.
"""
@spec get(t(), atom(), any()) :: any()
def get(config, key, default \\ nil) do
case Keyword.get(config, key, :not_found) do
:not_found -> get_env_config(config, key, default)
value -> value
end
end
defp get_env_config(config, key, default, env_key \\ :pow) do
config
|> Keyword.get(:otp_app)
|> case do
nil -> Application.get_all_env(env_key)
otp_app -> Application.get_env(otp_app, env_key, [])
end
|> Keyword.get(key, default)
end
@doc """
Puts a new key value to the configuration.
"""
@spec put(t(), atom(), any()) :: t()
def put(config, key, value) do
Keyword.put(config, key, value)
end
@doc """
Merges two configurations.
"""
@spec merge(t(), t()) :: t()
def merge(l_config, r_config) do
Keyword.merge(l_config, r_config)
end
@doc """
Raise a ConfigError exception.
"""
@spec raise_error(binary()) :: no_return()
def raise_error(message) do
raise ConfigError, message: message
end
@doc """
Retrieves the repo module from the config, or raises an exception.
"""
@spec repo!(t()) :: atom()
def repo!(config) do
get(config, :repo) || raise_error("No `:repo` configuration option found.")
end
@doc """
Retrieves the user schema module from the config, or raises an exception.
"""
@spec user!(t()) :: atom()
def user!(config) do
get(config, :user) || raise_error("No `:user` configuration option found.")
end
end