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Elixir Authentication framework
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lib/guardian/plug/error_handler.ex
defmodule Guardian.Plug.ErrorHandler do
@moduledoc """
A default error handler that can be used for failed authentication
"""
@callback unauthenticated(Plug.Conn.t, map) :: Plug.Conn.t
@callback unauthorized(Plug.Conn.t, map) :: Plug.Conn.t
@callback no_resource(Plug.Conn.t, map) :: Plug.Conn.t
import Plug.Conn
def unauthenticated(conn, _params) do
respond(conn, response_type(conn), 401, "Unauthenticated")
end
def unauthorized(conn, _params) do
respond(conn, response_type(conn), 403, "Unauthorized")
end
def no_resource(conn, _params) do
respond(conn, response_type(conn), 403, "Unauthorized")
end
def already_authenticated(conn, _params) do
conn |> halt
end
defp respond(conn, :json, status, msg) do
try do
conn
|> configure_session(drop: true)
|> put_resp_content_type("application/json")
|> send_resp(status, Poison.encode!(%{errors: [msg]}))
rescue ArgumentError ->
conn
|> put_resp_content_type("application/json")
|> send_resp(status, Poison.encode!(%{errors: [msg]}))
end
end
defp respond(conn, :html, status, msg) do
try do
conn
|> configure_session(drop: true)
|> put_resp_content_type("text/plain")
|> send_resp(status, msg)
rescue ArgumentError ->
conn
|> put_resp_content_type("text/plain")
|> send_resp(status, msg)
end
end
defp response_type(conn) do
accept = accept_header(conn)
if Regex.match?(~r/json/, accept) do
:json
else
:html
end
end
defp accept_header(conn) do
value = conn
|> get_req_header("accept")
|> List.first
value || ""
end
end