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REST-like API micro-framework for elixir inspired by grape.
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lib/maru/plugs/version.ex
defmodule Maru.Plugs.Version do
@moduledoc """
This module is a plug, fetch `version` from connect and wirte to private variable `maru_version`.
"""
alias Plug.Conn
@doc false
def init(opts) do
{strategy, options} = opts |> Keyword.pop(:using, :path)
unless strategy in [:path, :param, :accept_version_header] do
IO.write :stderr, "Unsupported versioning strategy: #{strategy}, Ignore."
end
{strategy, options}
end
@doc false
def call(conn, {:path, _opts}) do
case conn.private do
%{ maru_resource_path: [version | rest],
maru_route_path: route_path
} -> conn
|> Conn.put_private(:maru_resource_path, rest)
|> Conn.put_private(:maru_route_path, [version | route_path])
|> Conn.put_private(:maru_version, version)
_ -> conn
end
end
def call(conn, {:param, opts}) do
case opts |> Keyword.get(:parameter, :apiver) do
nil ->
conn
key ->
version = conn.params[to_string(key)]
conn |> Conn.put_private(:maru_version, version)
end
end
def call(conn, {:accept_version_header, _opts}) do
case Conn.get_req_header(conn, "accept-version") do
[version] -> conn |> Conn.put_private(:maru_version, version)
_ -> conn
end
end
def call(conn, _) do
conn
end
end