+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.Web.MediaProxy do
@base64_opts [padding: false]
def url(nil), do: nil
- def url(url = "/" <> _), do: url
+ def url(""), do: nil
+
+ def url("/" <> _ = url), do: url
def url(url) do
config = Application.get_env(:pleroma, :media_proxy, [])
- if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url) do
+
+ if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url()) do
url
else
secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
- base64 = Base.url_encode64(url, @base64_opts)
+
+ # Must preserve `%2F` for compatibility with S3
+ # https://git.pleroma.social/pleroma/pleroma/issues/580
+ replacement = get_replacement(url, ":2F:")
+
+ # The URL is url-decoded and encoded again to ensure it is correctly encoded and not twice.
+ base64 =
+ url
+ |> String.replace("%2F", replacement)
+ |> URI.decode()
+ |> URI.encode()
+ |> String.replace(replacement, "%2F")
+ |> Base.url_encode64(@base64_opts)
+
sig = :crypto.hmac(:sha, secret, base64)
sig64 = sig |> Base.url_encode64(@base64_opts)
- Keyword.get(config, :base_url, Pleroma.Web.base_url) <> "/proxy/#{sig64}/#{base64}"
+
+ build_url(sig64, base64, filename(url))
end
end
secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
sig = Base.url_decode64!(sig, @base64_opts)
local_sig = :crypto.hmac(:sha, secret, url)
+
if local_sig == sig do
{:ok, Base.url_decode64!(url, @base64_opts)}
else
end
end
+ def filename(url_or_path) do
+ if path = URI.parse(url_or_path).path, do: Path.basename(path)
+ end
+
+ def build_url(sig_base64, url_base64, filename \\ nil) do
+ [
+ Pleroma.Config.get([:media_proxy, :base_url], Pleroma.Web.base_url()),
+ "proxy",
+ sig_base64,
+ url_base64,
+ filename
+ ]
+ |> Enum.filter(fn value -> value end)
+ |> Path.join()
+ end
+
+ defp get_replacement(url, replacement) do
+ if String.contains?(url, replacement) do
+ get_replacement(url, replacement <> replacement)
+ else
+ replacement
+ end
+ end
end