mediaproxy: proxy network-path references

Discovered-by: snow
Fixes: https://akkoma.dev/AkkomaGang/akkoma/issues/900
(cherry picked from commit bbf974adc82d09a2099fb1234729131929307911)

test/pleroma/web/mastodon_api/views/status_view_test.exs

@@ -559,6 +559,46 @@ defmodule Pleroma.Web.MastodonAPI.StatusViewTest do
     assert mention.url == recipient_ap_id
   end
 
+  test "inlined images are media proxied" do
+    ConfigMock |> stub_with(Pleroma.Test.StaticConfig)
+    clear_config([:media_proxy, :enabled], true)
+    user = insert(:user)
+
+    {:ok, activity} =
+      CommonAPI.post(user, %{
+        content_type: "text/html",
+        status: "hii <img src=\"https://example.org/a.png\" />"
+      })
+
+    activity = Repo.get(Activity, activity.id)
+    status = StatusView.render("show.json", activity: activity)
+
+    assert_schema(status, "Status", Pleroma.Web.ApiSpec.spec())
+
+    assert status[:content] =~
+             ~r/^hii <img src="https?:\/\/[^\/]+\/proxy\/[^\/]+\/aHR0cHM6Ly9leGFtcGxlLm9yZy9hLnBuZw\/a.png"/
+  end
+
+  test "inlined images using network-path ref are media proxied" do
+    ConfigMock |> stub_with(Pleroma.Test.StaticConfig)
+    clear_config([:media_proxy, :enabled], true)
+    user = insert(:user)
+
+    {:ok, activity} =
+      CommonAPI.post(user, %{
+        content_type: "text/html",
+        status: "hii <img src=\"//example.org/a.png\" />"
+      })
+
+    activity = Repo.get(Activity, activity.id)
+    status = StatusView.render("show.json", activity: activity)
+
+    assert_schema(status, "Status", Pleroma.Web.ApiSpec.spec())
+
+    assert status[:content] =~
+             ~r/^hii <img src="https?:\/\/[^\/]+\/proxy\/[^\/]+\/aHR0cHM6Ly9leGFtcGxlLm9yZy9hLnBuZw\/a.png"/
+  end
+
   test "create mentions from the 'tag' field" do
     recipient = insert(:user)
     cc = insert_pair(:user) |> Enum.map(& &1.ap_id)

test/pleroma/web/media_proxy_test.exs

@@ -59,6 +59,20 @@ defmodule Pleroma.Web.MediaProxyTest do
       assert decode_result(encoded) == url
     end
 
+    test "encodes and decodes a network-path reference URL as HTTPS" do
+      url = "//example.org/static/logo.png"
+      encoded = MediaProxy.url(url)
+
+      assert String.starts_with?(
+               encoded,
+               Config.get([:media_proxy, :base_url], Pleroma.Web.Endpoint.url())
+             )
+
+      assert String.ends_with?(encoded, "/logo.png")
+
+      assert decode_result(encoded) == "https:" <> url
+    end
+
     test "encodes and decodes URL without a path" do
       url = "https://pleroma.soykaf.com"
       encoded = MediaProxy.url(url)