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