mirror of
https://github.com/philomena-dev/philomena.git
synced 2024-12-18 23:17:59 +01:00
38 lines
787 B
Elixir
38 lines
787 B
Elixir
defmodule PhilomenaWeb.ReferrerPlug do
|
|
@moduledoc """
|
|
This plug assigns the HTTP Referer, if it exists. Note the misspelling
|
|
in the standard.
|
|
|
|
## Example
|
|
|
|
plug PhilomenaWeb.ReferrerPlug
|
|
"""
|
|
|
|
alias Plug.Conn
|
|
|
|
@doc false
|
|
@spec init(any()) :: any()
|
|
def init(opts), do: opts
|
|
|
|
@doc false
|
|
@spec call(Conn.t(), any()) :: Conn.t()
|
|
def call(conn, _opts) do
|
|
conn
|
|
|> Conn.assign(:referrer, referer(conn))
|
|
|> Conn.assign(:ajax?, ajax?(conn))
|
|
end
|
|
|
|
defp referer(conn) do
|
|
case Conn.get_req_header(conn, "referer") do
|
|
[] -> "/"
|
|
[referrer] -> referrer
|
|
end
|
|
end
|
|
|
|
defp ajax?(conn) do
|
|
case Conn.get_req_header(conn, "x-requested-with") do
|
|
[value] -> String.downcase(value) == "xmlhttprequest"
|
|
_ -> false
|
|
end
|
|
end
|
|
end
|