service/pipewire: fix metadata permission checks

src/services/pipewire/defaults.cpp

@@ -193,6 +193,13 @@ bool PwDefaultTracker::setConfiguredDefault(const char* key, const QString& valu
 		return false;
 	}
 
+	if (!meta->hasSetPermission()) {
+		qCCritical(logDefaults
+		) << "Cannot set default node as write+execute permissions are missing for"
+		  << meta;
+		return false;
+	}
+
 	if (value.isEmpty()) {
 		meta->setProperty(key, "Spa:String:JSON", nullptr);
 	} else {

src/services/pipewire/metadata.cpp

@@ -2,13 +2,13 @@
 
 #include <pipewire/core.h>
 #include <pipewire/extensions/metadata.h>
+#include <pipewire/permission.h>
 #include <qlogging.h>
 #include <qloggingcategory.h>
 #include <qobject.h>
 #include <qstringview.h>
 #include <qtmetamacros.h>
 #include <qtypes.h>
-#include <spa/param/param.h>
 #include <spa/utils/dict.h>
 
 #include "registry.hpp"
@@ -54,7 +54,7 @@ int PwMetadata::onProperty(
 }
 
 bool PwMetadata::hasSetPermission() const {
-	return (this->perms & SPA_PARAM_INFO_WRITE) == SPA_PARAM_INFO_WRITE;
+	return (this->perms & (PW_PERM_W | PW_PERM_X)) == (PW_PERM_W | PW_PERM_X);
 }
 
 void PwMetadata::setProperty(const char* key, const char* type, const char* value) {
@@ -64,7 +64,8 @@ void PwMetadata::setProperty(const char* key, const char* type, const char* valu
 	}
 
 	if (!this->hasSetPermission()) {
-		qCCritical(logMeta) << "Tried to change property of" << this << "which is read-only.";
+		qCCritical(logMeta) << "Tried to change property of" << this
+		                    << "which is missing write+execute permissions.";
 	}
 
 	pw_metadata_set_property(this->proxy(), PW_ID_CORE, key, type, value);