feat(upload): add Exif.StripLocation and Exif.ReadDescription filters

Pure-Elixir filters based on exif_stripper. StripLocation also handles
WebP and HEIC/AVIF, which the exiftool filter skipped.

test/support/exif_helpers.ex

@@ -0,0 +1,44 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2026 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Tests.ExifHelpers do
+  @moduledoc """
+  Helpers for upload filter tests that use exiftool as an independent oracle.
+  """
+
+  @doc "Copies a fixture to a unique temporary file and returns an upload for it."
+  def upload_copy(fixture, content_type, attrs \\ []) do
+    source = Path.absname(Path.join("test/fixtures", fixture))
+
+    tempfile =
+      Path.join(
+        System.tmp_dir!(),
+        "pleroma_exif_#{System.unique_integer([:positive])}#{Path.extname(fixture)}"
+      )
+
+    File.cp!(source, tempfile)
+    ExUnit.Callbacks.on_exit(fn -> File.rm(tempfile) end)
+
+    struct!(
+      %Pleroma.Upload{
+        name: fixture,
+        content_type: content_type,
+        path: source,
+        tempfile: tempfile
+      },
+      attrs
+    )
+  end
+
+  @doc "Returns the GPS tags exiftool finds in a file, as text."
+  def gps_tags(path), do: exiftool!(["-gps:all", path])
+
+  @doc "Returns the value of one tag as exiftool reads it."
+  def tag(path, tag), do: exiftool!(["-s3", "-#{tag}", path])
+
+  defp exiftool!(args) do
+    {output, 0} = System.cmd("exiftool", ["-m" | args])
+    String.trim(output)
+  end
+end