Content store: Fix storage leak by storing screenshots in cache (#8137)

Author: rubenwardy

builtin/mainmenu/dlg_contentstore.lua

@@ -19,7 +19,7 @@ local store = {}
 local package_dialog = {}
 
 -- Screenshot
-local screenshot_dir = os.tempfolder()
+local screenshot_dir = core.get_cache_path() .. DIR_DELIM .. "cdb"
 assert(core.create_dir(screenshot_dir))
 local screenshot_downloading = {}
 local screenshot_downloaded = {}

doc/menu_lua_api.txt

@@ -65,6 +65,7 @@ core.get_video_drivers()
 ^ first element of returned list is guaranteed to be the NULL driver
 core.get_mapgen_names([include_hidden=false]) -> table of map generator algorithms
     registered in the core (possible in async calls)
+core.get_cache_path() -> path of cache
 
 Formspec:
 core.update_formspec(formspec)

src/script/lua_api/l_mainmenu.cpp

@@ -683,6 +683,12 @@ int ModApiMainMenu::l_get_texturepath_share(lua_State *L)
 	return 1;
 }
 
+int ModApiMainMenu::l_get_cache_path(lua_State *L)
+{
+	lua_pushstring(L, fs::RemoveRelativePathComponents(porting::path_cache).c_str());
+	return 1;
+}
+
 /******************************************************************************/
 int ModApiMainMenu::l_create_dir(lua_State *L) {
 	const char *path = luaL_checkstring(L, 1);
@@ -855,6 +861,9 @@ bool ModApiMainMenu::mayModifyPath(const std::string &path)
 	if (fs::PathStartsWith(path, fs::RemoveRelativePathComponents(porting::path_user + DIR_DELIM "worlds")))
 		return true;
 
+	if (fs::PathStartsWith(path, fs::RemoveRelativePathComponents(porting::path_cache)))
+		return true;
+
 	return false;
 }
 
@@ -1043,6 +1052,7 @@ void ModApiMainMenu::Initialize(lua_State *L, int top)
 	API_FCT(get_gamepath);
 	API_FCT(get_texturepath);
 	API_FCT(get_texturepath_share);
+	API_FCT(get_cache_path);
 	API_FCT(create_dir);
 	API_FCT(delete_dir);
 	API_FCT(copy_dir);
@@ -1071,6 +1081,7 @@ void ModApiMainMenu::InitializeAsync(lua_State *L, int top)
 	API_FCT(get_gamepath);
 	API_FCT(get_texturepath);
 	API_FCT(get_texturepath_share);
+	API_FCT(get_cache_path);
 	API_FCT(create_dir);
 	API_FCT(delete_dir);
 	API_FCT(copy_dir);

src/script/lua_api/l_mainmenu.h

@@ -120,6 +120,8 @@ class ModApiMainMenu: public ModApiBase
 
 	static int l_get_texturepath_share(lua_State *L);
 
+	static int l_get_cache_path(lua_State *L);
+
 	static int l_create_dir(lua_State *L);
 
 	static int l_delete_dir(lua_State *L);