[#1026] Filter.AnonymizeFilename added ability to retain file extension with custom text

test/upload/filter/anonymize_filename_test.exs

@@ -0,0 +1,40 @@
+defmodule Pleroma.Upload.Filter.AnonymizeFilenameTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Config
+  alias Pleroma.Upload
+
+  setup do
+    custom_filename = Config.get([Upload.Filter.AnonymizeFilename, :text])
+
+    on_exit(fn ->
+      Config.put([Upload.Filter.AnonymizeFilename, :text], custom_filename)
+    end)
+
+    upload_file = %Upload{
+      name: "an… image.jpg",
+      content_type: "image/jpg",
+      path: Path.absname("test/fixtures/image_tmp.jpg")
+    }
+
+    %{upload_file: upload_file}
+  end
+
+  test "it replaces filename on pre-defined text", %{upload_file: upload_file} do
+    Config.put([Upload.Filter.AnonymizeFilename, :text], "custom-file.png")
+    {:ok, %Upload{name: name}} = Upload.Filter.AnonymizeFilename.filter(upload_file)
+    assert name == "custom-file.png"
+  end
+
+  test "it replaces filename on pre-defined text expression", %{upload_file: upload_file} do
+    Config.put([Upload.Filter.AnonymizeFilename, :text], "custom-file.{extension}")
+    {:ok, %Upload{name: name}} = Upload.Filter.AnonymizeFilename.filter(upload_file)
+    assert name == "custom-file.jpg"
+  end
+
+  test "it replaces filename on random text", %{upload_file: upload_file} do
+    {:ok, %Upload{name: name}} = Upload.Filter.AnonymizeFilename.filter(upload_file)
+    assert <<_::bytes-size(14)>> <> ".jpg" = name
+    refute name == "an… image.jpg"
+  end
+end