aws_signed_url.ex
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aws_signed_url.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl do
	@behaviour Pleroma.Web.RichMedia.Parser.TTL

	@impl true
	def ttl(data, _url) do
	image = Map.get(data, "image")

	if aws_signed_url?(image) do
	image
	\|> parse_query_params()
	\|> format_query_params()
	\|> get_expiration_timestamp()
	else
	nil
	end
	end

	defp aws_signed_url?(image) when is_binary(image) and image != "" do
	%URI{host: host, query: query} = URI.parse(image)

	is_binary(host) and String.contains?(host, "amazonaws.com") and
	is_binary(query) and String.contains?(query, "X-Amz-Expires")
	end

	defp aws_signed_url?(_), do: nil

	defp parse_query_params(image) do
	%URI{query: query} = URI.parse(image)
	query
	end

	defp format_query_params(query) do
	query
	\|> String.split(~r/&\|=/)
	\|> Enum.chunk_every(2)
	\|> Map.new(fn [k, v] -> {k, v} end)
	end

	defp get_expiration_timestamp(params) when is_map(params) do
	{:ok, date} =
	params
	\|> Map.get("X-Amz-Date")
	\|> Timex.parse("{ISO:Basic:Z}")

	Timex.to_unix(date) + String.to_integer(Map.get(params, "X-Amz-Expires"))
	end
	end