add license, move folders

app/scripts/loading/file_downloader.gd

@@ -0,0 +1,115 @@
+extends Node
+
+class DownloadRequest:
+	var save_path: String
+	var http: HTTPRequest
+	var timer: Timer
+	
+	func _init(_save_path: String, _http: HTTPRequest, _timer: Timer) -> void:
+		save_path = _save_path
+		http = _http
+		timer = _timer
+
+const DOWNLOAD_FOLDER := "user://gates_data"
+const PROGRESS_DELAY := 0.3
+
+signal progress(url: String, body_size: int, downloaded_bytes: int)
+
+var download_requests: Array[DownloadRequest]
+
+
+func _ready() -> void:
+	FileTools.remove_recursive(DOWNLOAD_FOLDER)
+
+
+func is_cached(url: String) -> bool:
+	var save_path = DOWNLOAD_FOLDER + "/" + url.md5_text() + "." + url.get_file().get_extension()
+	return FileAccess.file_exists(save_path)
+
+
+func download(url: String, timeout: float = 0) -> String:
+	var save_path = DOWNLOAD_FOLDER + "/" + url.md5_text() + "." + url.get_file().get_extension()
+	
+	if FileAccess.file_exists(save_path):
+		await get_tree().process_frame
+		return save_path
+	DirAccess.make_dir_recursive_absolute(save_path.get_base_dir())
+	
+	var result = await create_request(url, save_path, timeout)
+	if result == 200:
+		return save_path
+	else:
+		DirAccess.remove_absolute(save_path)
+		return ""
+
+
+# Returns directory where file was downloaded. Keeps filename
+func download_shared_lib(url: String, gate_url: String) -> String:
+	var dir = DOWNLOAD_FOLDER + "/" + gate_url.md5_text()
+	var save_path = dir + "/" + url.get_file()
+	
+	if FileAccess.file_exists(save_path):
+		await get_tree().process_frame
+		return dir
+	DirAccess.make_dir_recursive_absolute(dir)
+	
+	var result = await create_request(url, save_path)
+	if result == 200:
+		return dir
+	else:
+		DirAccess.remove_absolute(save_path)
+		return ""
+
+
+func create_request(url: String, save_path: String, timeout: float = 0) -> int:
+	var http = HTTPRequest.new()
+	http.download_file = save_path
+	http.use_threads = true
+	http.timeout = timeout
+	add_child(http)
+	
+	var timer = create_progress_emitter(url, http)
+	var download_request = DownloadRequest.new(save_path, http, timer)
+	download_requests.append(download_request)
+	
+	var err = http.request(url)
+	if err != OK: return err
+	var code = (await http.request_completed)[1]
+	
+	progress.emit(url, http.get_body_size(), http.get_downloaded_bytes())
+	timer.stop()
+	remove_child(timer)
+	remove_child(http)
+	download_requests.erase(download_request)
+	
+	return code
+
+
+func create_progress_emitter(url: String, http: HTTPRequest) -> Timer:
+	var timer = Timer.new()
+	add_child(timer)
+	
+	var progress_emit = func():
+		progress.emit(url, http.get_body_size(), http.get_downloaded_bytes())
+	timer.timeout.connect(progress_emit)
+	timer.start(PROGRESS_DELAY)
+	
+	return timer
+
+
+func stop_all() -> void:
+	for request in download_requests:
+		request.http.cancel_request()
+		remove_child(request.http)
+		
+		request.timer.stop()
+		remove_child(request.timer)
+		
+		DirAccess.remove_absolute(request.save_path)
+	
+	download_requests.clear()
+
+
+func _exit_tree() -> void:
+	FileDownloader.stop_all()
+	FileTools.remove_recursive(DOWNLOAD_FOLDER)