Search dav spaces (#4661)

* Add a Ref option to SearchRequest, e.g. for limiting the search to a space

* Enable REPORT requests for /dav/spaces URLs

* Limit the search to the according space in case of /dav/spaces searches

* Add changelog

* Adapt expected failures

* Comment exported functions

services/proxy/pkg/config/defaults/defaultconfig.go

@@ -127,6 +127,11 @@ func DefaultPolicies() []config.Policy {
 					Endpoint: "/remote.php/webdav",
 					Backend:  "http://localhost:9115", // TODO use registry?
 				},
+				{
+					Method:   "REPORT",
+					Endpoint: "/dav/spaces",
+					Backend:  "http://localhost:9115",
+				},
 				{
 					Type:     config.QueryRoute,
 					Endpoint: "/dav/?preview=1",
@@ -204,6 +209,7 @@ func DefaultPolicies() []config.Policy {
 	}
 }
 
+// EnsureDefaults adds default values to the configuration if they are not set yet
 func EnsureDefaults(cfg *config.Config) {
 	// provide with defaults for shared logging, since we need a valid destination address for "envdecode".
 	if cfg.Log == nil && cfg.Commons != nil && cfg.Commons.Log != nil {
@@ -249,8 +255,8 @@ func EnsureDefaults(cfg *config.Config) {
 	}
 }
 
+// Sanitize sanitizes the configuration
 func Sanitize(cfg *config.Config) {
-	// sanitize config
 	if cfg.Policies == nil {
 		cfg.Policies = DefaultPolicies()
 	}