Add blurhash support to backend

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

test/web/upload/filter/analyze_metadata_test.exs

@@ -0,0 +1,20 @@
+# Portions of this file are derived from Pleroma:
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+# Upstream: https://git.pleroma.social/pleroma/pleroma/-/blob/develop/test/pleroma/upload/filter/analyze_metadata_test.exs
+
+defmodule Mobilizon.Web.Upload.Filter.AnalyzeMetadataTest do
+  use Mobilizon.DataCase, async: true
+  alias Mobilizon.Web.Upload.Filter.AnalyzeMetadata
+
+  test "adds the image dimensions" do
+    upload = %Mobilizon.Web.Upload{
+      name: "an… image.jpg",
+      content_type: "image/jpeg",
+      path: Path.absname("test/fixtures/image.jpg"),
+      tempfile: Path.absname("test/fixtures/image.jpg")
+    }
+
+    assert {:ok, :filtered, %{width: 266, height: 67}} = AnalyzeMetadata.filter(upload)
+  end
+end