6 files changed, 34 insertions, 0 deletions
diff --git a/src/script/lua_api/l_itemstackmeta.cpp b/src/script/lua_api/l_itemstackmeta.cpp
index 3c0f68406..8ce9673db 100644
--- a/src/script/lua_api/l_itemstackmeta.cpp
+++ b/src/script/lua_api/l_itemstackmeta.cpp
@@ -97,6 +97,7 @@ const luaL_Reg ItemStackMetaRef::methods[] = {
 	luamethod(MetaDataRef, set_int),
 	luamethod(MetaDataRef, get_float),
 	luamethod(MetaDataRef, set_float),
+	luamethod(MetaDataRef, get_keys),
 	luamethod(MetaDataRef, to_table),
 	luamethod(MetaDataRef, from_table),
 	luamethod(MetaDataRef, equals),
diff --git a/src/script/lua_api/l_metadata.cpp b/src/script/lua_api/l_metadata.cpp
index 8388bc089..68b79331b 100644
--- a/src/script/lua_api/l_metadata.cpp
+++ b/src/script/lua_api/l_metadata.cpp
@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "serverenvironment.h"
 #include "map.h"
 #include "server.h"
+#include "util/basic_macros.h"
 
 MetaDataRef *MetaDataRef::checkAnyMetadata(lua_State *L, int narg)
 {
@@ -196,6 +197,31 @@ int MetaDataRef::l_set_float(lua_State *L)
 	return 0;
 }
 
+// get_keys(self)
+int MetaDataRef::l_get_keys(lua_State *L)
+{
+	MAP_LOCK_REQUIRED;
+
+	MetaDataRef *ref = checkAnyMetadata(L, 1);
+
+	IMetadata *meta = ref->getmeta(false);
+	if (meta == NULL) {
+		lua_newtable(L);
+		return 1;
+	}
+
+	std::vector<std::string> keys_;
+	const std::vector<std::string> &keys = meta->getKeys(&keys_);
+
+	int i = 0;
+	lua_createtable(L, keys.size(), 0);
+	for (const std::string &key : keys) {
+		lua_pushlstring(L, key.c_str(), key.size());
+		lua_rawseti(L, -2, ++i);
+	}
+	return 1;
+}
+
 // to_table(self)
 int MetaDataRef::l_to_table(lua_State *L)
 {
diff --git a/src/script/lua_api/l_metadata.h b/src/script/lua_api/l_metadata.h
index 084b06c83..cae15e232 100644
--- a/src/script/lua_api/l_metadata.h
+++ b/src/script/lua_api/l_metadata.h
@@ -74,6 +74,9 @@ protected:
 	// set_float(self, name, var)
 	static int l_set_float(lua_State *L);
 
+	// get_keys(self)
+	static int l_get_keys(lua_State *L);
+
 	// to_table(self)
 	static int l_to_table(lua_State *L);
 
diff --git a/src/script/lua_api/l_nodemeta.cpp b/src/script/lua_api/l_nodemeta.cpp
index 3cfb25883..f4edc1790 100644
--- a/src/script/lua_api/l_nodemeta.cpp
+++ b/src/script/lua_api/l_nodemeta.cpp
@@ -209,6 +209,7 @@ const luaL_Reg NodeMetaRef::methodsServer[] = {
 	luamethod(MetaDataRef, set_int),
 	luamethod(MetaDataRef, get_float),
 	luamethod(MetaDataRef, set_float),
+	luamethod(MetaDataRef, get_keys),
 	luamethod(MetaDataRef, to_table),
 	luamethod(MetaDataRef, from_table),
 	luamethod(NodeMetaRef, get_inventory),
@@ -230,6 +231,7 @@ const luaL_Reg NodeMetaRef::methodsClient[] = {
 	luamethod(MetaDataRef, get_string),
 	luamethod(MetaDataRef, get_int),
 	luamethod(MetaDataRef, get_float),
+	luamethod(MetaDataRef, get_keys),
 	luamethod(MetaDataRef, to_table),
 	{0,0}
 };
diff --git a/src/script/lua_api/l_playermeta.cpp b/src/script/lua_api/l_playermeta.cpp
index 6ccb53e1c..def65a1cc 100644
--- a/src/script/lua_api/l_playermeta.cpp
+++ b/src/script/lua_api/l_playermeta.cpp
@@ -70,6 +70,7 @@ const luaL_Reg PlayerMetaRef::methods[] = {
 	luamethod(MetaDataRef, set_int),
 	luamethod(MetaDataRef, get_float),
 	luamethod(MetaDataRef, set_float),
+	luamethod(MetaDataRef, get_keys),
 	luamethod(MetaDataRef, to_table),
 	luamethod(MetaDataRef, from_table),
 	luamethod(MetaDataRef, equals),
diff --git a/src/script/lua_api/l_storage.cpp b/src/script/lua_api/l_storage.cpp
index 4b3863ca9..e1d47ba72 100644
--- a/src/script/lua_api/l_storage.cpp
+++ b/src/script/lua_api/l_storage.cpp
@@ -74,6 +74,7 @@ const luaL_Reg StorageRef::methods[] = {
 	luamethod(MetaDataRef, set_int),
 	luamethod(MetaDataRef, get_float),
 	luamethod(MetaDataRef, set_float),
+	luamethod(MetaDataRef, get_keys),
 	luamethod(MetaDataRef, to_table),
 	luamethod(MetaDataRef, from_table),
 	luamethod(MetaDataRef, equals),