55 lines
1.2 KiB
Elixir
55 lines
1.2 KiB
Elixir
defmodule Pleroma.Web.RichMedia.Parser.TTL.AwsSignedUrl do
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def run(data, url) do
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image = Map.get(data, :image)
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if is_aws_signed_url(image) do
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image
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|> parse_query_params()
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|> format_query_params()
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|> get_expiration_timestamp()
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|> set_ttl(url)
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end
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end
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defp is_aws_signed_url(""), do: nil
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defp is_aws_signed_url(nil), do: nil
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defp is_aws_signed_url(image) when is_binary(image) do
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%URI{host: host, query: query} = URI.parse(image)
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if String.contains?(host, "amazonaws.com") and
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String.contains?(query, "X-Amz-Expires") do
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image
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else
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nil
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end
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end
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defp is_aws_signed_url(_), do: nil
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defp parse_query_params(image) do
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%URI{query: query} = URI.parse(image)
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query
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end
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defp format_query_params(query) do
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query
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|> String.split(~r/&|=/)
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|> Enum.chunk_every(2)
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|> Map.new(fn [k, v] -> {k, v} end)
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end
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defp get_expiration_timestamp(params) when is_map(params) do
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{:ok, date} =
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params
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|> Map.get("X-Amz-Date")
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|> Timex.parse("{ISO:Basic:Z}")
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Timex.to_unix(date) + String.to_integer(Map.get(params, "X-Amz-Expires"))
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end
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defp set_ttl(ttl, url) do
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Cachex.expire_at(:rich_media_cache, url, ttl * 1000)
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end
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end
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