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lib/confex/adapters/file_from_system_environment.ex
defmodule Confex.Adapters.FileFromSystemEnvironment do
@moduledoc """
Adapter to fetch values from a file with path specified in a system environment variables.
"""
@behaviour Confex.Adapter
@doc """
Fetch value from file which path is specified in an environment variable.
Newline in the end of file is ignored.
## Example
iex> :ok = System.delete_env("SOME_TEST_FILE")
...> :error = #{__MODULE__}.fetch_value("SOME_TEST_FILE")
...> :ok = System.put_env("SOME_TEST_FILE", "test/fixtures/file_secret.txt")
...> {:ok, "foo_bar"} = #{__MODULE__}.fetch_value("SOME_TEST_FILE")
{:ok, "foo_bar"}
"""
def fetch_value(key) do
case System.get_env(key) do
nil -> :error
path -> read_value(path)
end
end
defp read_value(path) do
case File.read(path) do
{:ok, value} -> {:ok, String.trim_trailing(value, "\n")}
_ -> :error
end
end
end