distraction.party/test/media_proxy_test.exs

# Pleroma: A lightweight social networking server
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.MediaProxyTest do
  use ExUnit.Case
  import Pleroma.Web.MediaProxy
  alias Pleroma.Web.MediaProxy.MediaProxyController

  setup do
    enabled = Pleroma.Config.get([:media_proxy, :enabled])
    on_exit(fn -> Pleroma.Config.put([:media_proxy, :enabled], enabled) end)
    :ok
  end

  describe "when enabled" do
    setup do
      Pleroma.Config.put([:media_proxy, :enabled], true)
      :ok
    end

    test "ignores invalid url" do
      assert url(nil) == nil
      assert url("") == nil
    end

    test "ignores relative url" do
      assert url("/local") == "/local"
      assert url("/") == "/"
    end

    test "ignores local url" do
      local_url = Pleroma.Web.Endpoint.url() <> "/hello"
      local_root = Pleroma.Web.Endpoint.url()
      assert url(local_url) == local_url
      assert url(local_root) == local_root
    end

    test "encodes and decodes URL" do
      url = "https://pleroma.soykaf.com/static/logo.png"
      encoded = url(url)

      assert String.starts_with?(
               encoded,
               Pleroma.Config.get([:media_proxy, :base_url], Pleroma.Web.base_url())
             )

      assert String.ends_with?(encoded, "/logo.png")

      assert decode_result(encoded) == url
    end

    test "encodes and decodes URL without a path" do
      url = "https://pleroma.soykaf.com"
      encoded = url(url)
      assert decode_result(encoded) == url
    end

    test "encodes and decodes URL without an extension" do
      url = "https://pleroma.soykaf.com/path/"
      encoded = url(url)
      assert String.ends_with?(encoded, "/path")
      assert decode_result(encoded) == url
    end

    test "encodes and decodes URL and ignores query params for the path" do
      url = "https://pleroma.soykaf.com/static/logo.png?93939393939&bunny=true"
      encoded = url(url)
      assert String.ends_with?(encoded, "/logo.png")
      assert decode_result(encoded) == url
    end

    test "ensures urls are url-encoded" do
      assert decode_result(url("https://pleroma.social/Hello world.jpg")) ==
               "https://pleroma.social/Hello%20world.jpg"

      assert decode_result(url("https://pleroma.social/Hello%20world.jpg")) ==
               "https://pleroma.social/Hello%20world.jpg"
    end

    test "validates signature" do
      secret_key_base = Pleroma.Config.get([Pleroma.Web.Endpoint, :secret_key_base])

      on_exit(fn ->
        Pleroma.Config.put([Pleroma.Web.Endpoint, :secret_key_base], secret_key_base)
      end)

      encoded = url("https://pleroma.social")

      Pleroma.Config.put(
        [Pleroma.Web.Endpoint, :secret_key_base],
        "00000000000000000000000000000000000000000000000"
      )

      [_, "proxy", sig, base64 | _] = URI.parse(encoded).path |> String.split("/")
      assert decode_url(sig, base64) == {:error, :invalid_signature}
    end

    test "filename_matches matches url encoded paths" do
      assert MediaProxyController.filename_matches(
               true,
               "/Hello%20world.jpg",
               "http://pleroma.social/Hello world.jpg"
             ) == :ok

      assert MediaProxyController.filename_matches(
               true,
               "/Hello%20world.jpg",
               "http://pleroma.social/Hello%20world.jpg"
             ) == :ok
    end

    test "filename_matches matches non-url encoded paths" do
      assert MediaProxyController.filename_matches(
               true,
               "/Hello world.jpg",
               "http://pleroma.social/Hello%20world.jpg"
             ) == :ok

      assert MediaProxyController.filename_matches(
               true,
               "/Hello world.jpg",
               "http://pleroma.social/Hello world.jpg"
             ) == :ok
    end

    test "uses the configured base_url" do
      base_url = Pleroma.Config.get([:media_proxy, :base_url])

      if base_url do
        on_exit(fn ->
          Pleroma.Config.put([:media_proxy, :base_url], base_url)
        end)
      end

      Pleroma.Config.put([:media_proxy, :base_url], "https://cache.pleroma.social")

      url = "https://pleroma.soykaf.com/static/logo.png"
      encoded = url(url)

      assert String.starts_with?(encoded, Pleroma.Config.get([:media_proxy, :base_url]))
    end

    # https://git.pleroma.social/pleroma/pleroma/issues/580
    test "encoding S3 links (must preserve `%2F`)" do
      url =
        "https://s3.amazonaws.com/example/test.png?X-Amz-Credential=your-access-key-id%2F20130721%2Fus-east-1%2Fs3%2Faws4_request"

      encoded = url(url)
      assert decode_result(encoded) == url
    end

    test "does not change whitelisted urls" do
      upload_config = Pleroma.Config.get([Pleroma.Upload])
      media_url = "https://media.pleroma.social"
      Pleroma.Config.put([Pleroma.Upload, :base_url], media_url)
      Pleroma.Config.put([:media_proxy, :whitelist], ["media.pleroma.social"])
      Pleroma.Config.put([:media_proxy, :base_url], "https://cache.pleroma.social")

      url = "#{media_url}/static/logo.png"
      encoded = url(url)

      assert String.starts_with?(encoded, media_url)

      Pleroma.Config.put([Pleroma.Upload], upload_config)
    end
  end

  describe "when disabled" do
    setup do
      enabled = Pleroma.Config.get([:media_proxy, :enabled])

      if enabled do
        Pleroma.Config.put([:media_proxy, :enabled], false)

        on_exit(fn ->
          Pleroma.Config.put([:media_proxy, :enabled], enabled)
          :ok
        end)
      end

      :ok
    end

    test "does not encode remote urls" do
      assert url("https://google.fr") == "https://google.fr"
    end
  end

  defp decode_result(encoded) do
    [_, "proxy", sig, base64 | _] = URI.parse(encoded).path |> String.split("/")
    {:ok, decoded} = decode_url(sig, base64)
    decoded
  end

  test "mediaproxy whitelist" do
    Pleroma.Config.put([:media_proxy, :enabled], true)
    Pleroma.Config.put([:media_proxy, :whitelist], ["google.com", "feld.me"])
    url = "https://feld.me/foo.png"

    unencoded = url(url)
    assert unencoded == url
  end
end