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|
defmodule Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl do
@behaviour Pleroma.Web.RichMedia.Parser.TTL
@impl Pleroma.Web.RichMedia.Parser.TTL
def ttl(data, _url) do
image = Map.get(data, :image)
if is_aws_signed_url(image) do
image
|> parse_query_params()
|> format_query_params()
|> get_expiration_timestamp()
end
end
defp is_aws_signed_url(""), do: nil
defp is_aws_signed_url(nil), do: nil
defp is_aws_signed_url(image) when is_binary(image) do
%URI{host: host, query: query} = URI.parse(image)
if String.contains?(host, "amazonaws.com") and String.contains?(query, "X-Amz-Expires") do
image
else
nil
end
end
defp is_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
|
