38 lines
1.1 KiB
Elixir
38 lines
1.1 KiB
Elixir
defmodule Pleroma.Web.MediaProxy do
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@base64_opts [padding: false]
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def url(nil), do: nil
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def url(""), do: nil
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def url(url = "/" <> _), do: url
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def url(url) do
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config = Application.get_env(:pleroma, :media_proxy, [])
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if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url()) do
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url
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else
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secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
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base64 = Base.url_encode64(url, @base64_opts)
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sig = :crypto.hmac(:sha, secret, base64)
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sig64 = sig |> Base.url_encode64(@base64_opts)
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filename = if path = URI.parse(url).path, do: "/" <> Path.basename(path), else: ""
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Keyword.get(config, :base_url, Pleroma.Web.base_url()) <>
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"/proxy/#{sig64}/#{base64}#{filename}"
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end
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end
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def decode_url(sig, url) do
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secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
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sig = Base.url_decode64!(sig, @base64_opts)
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local_sig = :crypto.hmac(:sha, secret, 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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end
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