download system

flumi/Scripts/Utils/Lua/Download.gd

@@ -0,0 +1,65 @@
+class_name LuaDownloadUtils
+extends RefCounted
+
+static var last_user_event_time: int = 0
+static var user_event_window_ms: int = 100
+static var next_download_id: int = 1
+
+static func setup_download_api(vm: LuauVM):
+	vm.lua_pushcallable(_lua_download_handler, "gurt.download")
+	vm.lua_getglobal("gurt")
+	if vm.lua_isnil(-1):
+		vm.lua_pop(1)
+		vm.lua_newtable()
+		vm.lua_setglobal("gurt")
+		vm.lua_getglobal("gurt")
+	
+	vm.lua_pushvalue(-2)
+	vm.lua_setfield(-2, "download")
+	vm.lua_pop(2)
+
+static func mark_user_event():
+	last_user_event_time = Time.get_ticks_msec()
+
+static func _check_if_likely_user_event(current_time: int) -> bool:
+	var time_since_user_event = current_time - last_user_event_time
+	return time_since_user_event < user_event_window_ms
+
+static func _lua_download_handler(vm: LuauVM) -> int:
+	var url: String = vm.luaL_checkstring(1)
+	var filename: String = ""
+	
+	if vm.lua_gettop() >= 2 and not vm.lua_isnil(2):
+		filename = vm.luaL_checkstring(2)
+	else:
+		filename = url.get_file()
+		if filename.is_empty():
+			filename = "download"
+	
+	var current_time = Time.get_ticks_msec()
+	var is_likely_user_event = _check_if_likely_user_event(current_time)
+	
+	if not is_likely_user_event:
+		vm.luaL_error("Download can only be called from within a user interaction (like a click event)")
+		return 0
+	
+	var download_id = "download_" + str(next_download_id)
+	next_download_id += 1
+	
+	var download_data = {
+		"id": download_id,
+		"url": url,
+		"filename": filename,
+		"timestamp": Time.get_unix_time_from_system()
+	}
+	
+	var lua_api = vm.get_meta("lua_api") as LuaAPI
+	if lua_api:
+		var operation = {
+			"type": "request_download",
+			"download_data": download_data
+		}
+		lua_api.call_deferred("_handle_dom_operation", operation)
+	
+	vm.lua_pushstring(download_id)
+	return 1

flumi/Scripts/Utils/Lua/Download.gd.uid

@@ -0,0 +1 @@
+uid://b3nu8c4qlxj45

flumi/Scripts/Utils/Lua/Event.gd

@@ -16,6 +16,7 @@ static func connect_element_event(signal_node: Node, event_name: String, subscri
 			if signal_node.has_signal("pressed"):
 				var wrapper = func(): 
 					LuaAudioUtils.mark_user_event()
+					LuaDownloadUtils.mark_user_event()
 					subscription.lua_api._on_event_triggered(subscription)
 				signal_node.pressed.connect(wrapper)
 				subscription.connected_signal = "pressed"
@@ -25,6 +26,7 @@ static func connect_element_event(signal_node: Node, event_name: String, subscri
 			elif signal_node is Control:
 				var wrapper = func(event: InputEvent):
 					LuaAudioUtils.mark_user_event() 
+					LuaDownloadUtils.mark_user_event()
 					subscription.lua_api._on_gui_input_click(event, subscription)
 				signal_node.gui_input.connect(wrapper)
 				subscription.connected_signal = "gui_input"

flumi/Scripts/Utils/Lua/ThreadedVM.gd

@@ -379,6 +379,7 @@ func _setup_additional_lua_apis():
 	LuaJSONUtils.setup_json_api(lua_vm)
 	LuaWebSocketUtils.setup_websocket_api(lua_vm)
 	LuaAudioUtils.setup_audio_api(lua_vm)
+	LuaDownloadUtils.setup_download_api(lua_vm)
 	LuaCrumbsUtils.setup_crumbs_api(lua_vm)
 	LuaRegexUtils.setup_regex_api(lua_vm)
 	LuaURLUtils.setup_url_api(lua_vm)