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34 lines
810 B
Elixir
34 lines
810 B
Elixir
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defmodule Pleroma.Web.MediaProxy do
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@base64_opts [padding: false]
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@base64_key Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
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def url(nil), do: nil
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def url(url) do
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if String.starts_with?(url, Pleroma.Web.base_url) do
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url
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else
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base64 = Base.url_encode64(url, @base64_opts)
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sig = :crypto.hmac(:sha, @base64_key, base64)
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sig64 = sig |> Base.url_encode64(@base64_opts)
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cache_url("#{sig64}/#{base64}")
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end
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end
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def decode_url(sig, url) do
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sig = Base.url_decode64!(sig, @base64_opts)
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local_sig = :crypto.hmac(:sha, @base64_key, url)
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if local_sig == sig do
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{:ok, Base.url_decode64!(url, @base64_opts)}
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else
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{:error, :invalid_signature}
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end
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end
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defp cache_url(path) do
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"/proxy/" <> path
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end
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end
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