git.squeep.com Git - akkoma/blob - lib/pleroma/web/rich_media/parsers/ttl/aws_signed_url.ex

   1 defmodule Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl do
   2   @behaviour Pleroma.Web.RichMedia.Parser.TTL
   3
   4   @impl Pleroma.Web.RichMedia.Parser.TTL
   5   def ttl(data, _url) do
   6     image = Map.get(data, :image)
   7
   8     if is_aws_signed_url(image) do
   9       image
  10       |> parse_query_params()
  11       |> format_query_params()
  12       |> get_expiration_timestamp()
  13     end
  14   end
  15
  16   defp is_aws_signed_url(""), do: nil
  17   defp is_aws_signed_url(nil), do: nil
  18
  19   defp is_aws_signed_url(image) when is_binary(image) do
  20     %URI{host: host, query: query} = URI.parse(image)
  21
  22     if String.contains?(host, "amazonaws.com") and String.contains?(query, "X-Amz-Expires") do
  23       image
  24     else
  25       nil
  26     end
  27   end
  28
  29   defp is_aws_signed_url(_), do: nil
  30
  31   defp parse_query_params(image) do
  32     %URI{query: query} = URI.parse(image)
  33     query
  34   end
  35
  36   defp format_query_params(query) do
  37     query
  38     |> String.split(~r/&|=/)
  39     |> Enum.chunk_every(2)
  40     |> Map.new(fn [k, v] -> {k, v} end)
  41   end
  42
  43   defp get_expiration_timestamp(params) when is_map(params) do
  44     {:ok, date} =
  45       params
  46       |> Map.get("X-Amz-Date")
  47       |> Timex.parse("{ISO:Basic:Z}")
  48
  49     Timex.to_unix(date) + String.to_integer(Map.get(params, "X-Amz-Expires"))
  50   end
  51 end