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>

ocis-pkg/capabilities/defaults.go

@@ -0,0 +1,35 @@
+package capabilities
+
+import (
+	"sync/atomic"
+
+	"github.com/cs3org/reva/v2/pkg/owncloud/ocs"
+)
+
+// allow the consuming part to change defaults, e.g., tests
+var defaultCapabilities atomic.Pointer[ocs.Capabilities]
+
+func init() { //nolint:gochecknoinits
+	ResetDefault()
+}
+
+// ResetDefault resets the default [Capabilities] to the default values.
+func ResetDefault() {
+	defaultCapabilities.Store(
+		&ocs.Capabilities{
+			Theme: &ocs.CapabilitiesTheme{
+				Logo: &ocs.CapabilitiesThemeLogo{
+					PermittedFileTypes: map[string]string{
+						".jpg":  "image/jpeg",
+						".jpeg": "image/jpeg",
+						".png":  "image/png",
+						".gif":  "image/gif",
+					},
+				},
+			},
+		},
+	)
+}
+
+// Default returns the default [Capabilities].
+func Default() *ocs.Capabilities { return defaultCapabilities.Load() }