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plug_canonical_host

0.2.0
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PlugCanonicalHost ensures that all requests are served by a single canonical host. It will redirect all requests from non-canonical hosts to the canonical one.

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plug_canonical_host lib plug_canonical_host.ex
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lib/plug_canonical_host.ex 

defmodule PlugCanonicalHost do

  import Plug.Conn



  @location_header "location"

  @status_code 301

  @html_template """

    <!DOCTYPE html>

    <html lang="en-US">

      <head><title>301 Moved Permanently</title></head>

      <body>

        <h1>Moved Permanently</h1>

        <p>The document has moved <a href="%s">here</a>.</p>

      </body>

    </html>

  """



  def init([canonical_host: canonical_host]), do: [canonical_host: canonical_host]



  def call(conn = %Plug.Conn{host: host}, [canonical_host: canonical_host]) when host !== canonical_host do

    location = conn |> redirect_location(canonical_host)



    conn

    |> put_resp_header(@location_header, location)

    |> send_resp(@status_code, String.replace(@html_template, "%s", location))

    |> halt

  end



  def call(conn, _), do: conn



  defp redirect_location(conn, canonical_host) do

    conn

    |> request_uri

    |> URI.parse

    |> Map.put(:host, canonical_host)

    |> URI.to_string

  end



  defp request_uri(conn) do

    "#{conn.scheme}://#{conn.host}:#{conn.port}#{conn.request_path}?#{conn.query_string}"

  end

end