Support data uris in uploads.

lib/pleroma/upload.ex

@@ -18,6 +18,31 @@ def store(%Plug.Upload{} = file) do
     }
   end
 
+  def store(%{"img" => "data:image/" <> image_data}) do
+    parsed = Regex.named_captures(~r/(?<filetype>jpeg|png|gif);base64,(?<data>.*)/, image_data)
+    data = Base.decode64!(parsed["data"])
+    uuid = Ecto.UUID.generate
+    upload_folder = Path.join(upload_path(), uuid)
+    File.mkdir_p!(upload_folder)
+    filename = Base.encode16(:crypto.hash(:sha256, data)) <> ".#{parsed["filetype"]}"
+    result_file = Path.join(upload_folder, filename)
+
+    File.write!(result_file, data)
+
+    content_type = "image/#{parsed["filetype"]}"
+
+    %{
+      "type" => "Image",
+      "url" => [%{
+        "type" => "Link",
+        "mediaType" => content_type,
+        "href" => url_for(Path.join(uuid, filename))
+      }],
+      "name" => filename,
+      "uuid" => uuid
+    }
+  end
+
   defp upload_path do
     Application.get_env(:pleroma, Pleroma.Upload)
     |> Keyword.fetch!(:uploads)

lib/pleroma/web/activity_pub/activity_pub.ex

@@ -167,7 +167,7 @@ def fetch_activities_for_context(context) do
     Repo.all(query)
   end
 
-  def upload(%Plug.Upload{} = file) do
+  def upload(file) do
     data = Upload.store(file)
     Repo.insert(%Object{data: data})
   end