enhancement: introduce theme processing (#9133)

* enhancement: introduce theme processing

* enhancement: introduce theme processing

* enhancement: add theme processing tests and changelog

* Update services/web/pkg/config/config.go

Co-authored-by: Michael Barz <michael.barz@zeitgestalten.eu>

* fix: ci findings

* Apply suggestions from code review

Co-authored-by: Martin <github@diemattels.at>

* enhancement: use the theme assets from web instead of having them inside the oCis repo (license clash Apache vs. AGPLv3)

* fix: golangci tagalign order

* fix: rename UnifiedRoleUploader to UnifiedRoleEditorLite

* fix: some typos

Co-authored-by: Michael Barz <michael.barz@zeitgestalten.eu>

* enhancement: export supported theme logo upload filetypes

* chore: bump reva

* fix: allow init func

---------

Co-authored-by: Michael Barz <michael.barz@zeitgestalten.eu>
Co-authored-by: Martin <github@diemattels.at>

services/web/pkg/theme/theme_test.go

@@ -0,0 +1,30 @@
+package theme_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/owncloud/ocis/v2/services/web/pkg/theme"
+)
+
+// TestAllowedLogoFileTypes is here to ensure that a certain set of bare minimum file types are allowed for logos.
+func TestAllowedLogoFileTypes(t *testing.T) {
+	type test struct {
+		filename string
+		mimetype string
+		allowed  bool
+	}
+
+	tests := []test{
+		{filename: "foo.jpg", mimetype: "image/jpeg", allowed: true},
+		{filename: "foo.jpeg", mimetype: "image/jpeg", allowed: true},
+		{filename: "foo.png", mimetype: "image/png", allowed: true},
+		{filename: "foo.gif", mimetype: "image/gif", allowed: true},
+		{filename: "foo.tiff", mimetype: "image/tiff", allowed: false},
+	}
+
+	for _, tc := range tests {
+		assert.Equal(t, theme.IsFiletypePermitted(tc.filename, tc.mimetype), tc.allowed)
+	}
+}