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38 lines
787 B
Elixir
38 lines
787 B
Elixir
defmodule PhilomenaWeb.ReferrerPlug do
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@moduledoc """
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This plug assigns the HTTP Referer, if it exists. Note the misspelling
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in the standard.
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## Example
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plug PhilomenaWeb.ReferrerPlug
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"""
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alias Plug.Conn
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@doc false
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@spec init(any()) :: any()
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def init(opts), do: opts
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@doc false
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@spec call(Conn.t(), any()) :: Conn.t()
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def call(conn, _opts) do
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conn
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|> Conn.assign(:referrer, referer(conn))
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|> Conn.assign(:ajax?, ajax?(conn))
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end
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defp referer(conn) do
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case Conn.get_req_header(conn, "referer") do
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[] -> "/"
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[referrer] -> referrer
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end
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end
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defp ajax?(conn) do
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case Conn.get_req_header(conn, "x-requested-with") do
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[value] -> String.downcase(value) == "xmlhttprequest"
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_ -> false
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end
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end
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end
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