AJAX plugin - SkIvLib

AJAX plugin by Ivan Skvortsov

Script này sẽ không được không được cài đặt trực tiếp. Nó là một thư viện cho các script khác để bao gồm các chỉ thị meta // @require https://update.greatest.deepsurf.us/scripts/31953/209659/AJAX%20plugin%20-%20SkIvLib.js

// ==UserScript==
// @name           AJAX plugin - SkIvLib
// @description    AJAX plugin by Ivan Skvortsov
// @description:ru AJAX плагин от Ivan Skvortsov
// @include        *://*
// @author         Ivan Skvortsov
// @version        1.1.3
// @grant          none
// ==/UserScript==

(function(){
	var clog = function(){};
	if( !clog )
		clog = console.log;
	var factory = [], queue = [], request_in_progress = false, queue_cleaned = true;
	var xhttpResponse = [];
	function addXHttpResponse( responseText )
	{
		if( typeof responseText !== 'string' )
			return xhttpResponse.push({invalid: true});
		xhttpResponse.push({
			invalid: false,
			text: responseText,
			get bytes(){ return this.text.length; },
			get Kb(){ return this.bytes/1024; },
			get Mb(){ return this.bytes/(1024 * 1024); },
		});
	}
	function queueStatus()
	{
		return "queueStatus:\n" +
			"queue.length = " + queue.length + "\n" +
			"in_progress  = " + request_in_progress + "\n" +
			"cleaned      = " + queue_cleaned + "\n" +
			"--------------";
	}
	function requestStatus( request )
	{
		return "requestStatus:\n" +
			"method = " + request.method + "\n" +
			"url    = " + request.url + "\n" +
			"async  = " + request.async + "\n" +
			"data   = " + request.data + "\n" +
			//"onload = " + request.onload + "\n" +
			"--------------";
	}
	function createNewObject( obj )
	{
		if( !obj )
			return {};
		var new_obj = {}, key, val;
		for( key in obj )
		{
			val = obj[key];
			if( Object.prototype.hasOwnProperty.call(obj, key) && val )
				new_obj[key] = val;
		}
		return new_obj;
	}
	function initXHttpFactory()
	{
		if( factory && factory.length > 0 )
			return;
		clog( "initXHttpFactory");
		factory = [
			function(){ return new XMLHttpRequest();},
			function(){ return new ActiveXObject('Msxml3.XMLHTTP');},
			function(){ return new ActiveXObject('Msxml2.XMLHTTP.6.0');},
			function(){ return new ActiveXObject('Msxml2.XMLHTTP.3.0');},
			function(){ return new ActiveXObject('Msxml2.XMLHTTP');},
			function(){ return new ActiveXObject('Microsoft.XMLHTTP');},
		];
	}
	function createXHttp()
	{
		clog("createXHttp");
		initXHttpFactory();
		for( let i = 0; i < factory.length; ++i )
		{
			try{
				return factory[i]();
			}catch(error){}
		}
		console.error("[createXHttp] can't create xhttp object");
		return null;
	}
	function getXHttpRequest()
	{
		clog("getXHttpRequest : queue.length = " + queue.length);
		if( !(queue.length > 0) )
			return null;
		var request = queue[0];
		request.method = request.method || 'GET';
		if( request.method.toUpperCase() === 'GET' && request.data && request.data !== '' )
		{
			request.url += '?' + request.data;
			request.data = '';
		}
		request.async = (typeof request.async !== 'boolean' ? true : request.async );
		request.store = (typeof request.store !== 'boolean' ? false: request.store );
		clog( requestStatus(request) );
		return request;
	}
	function handleXHttpEvent( type, xhttp, request, event )
	{
		clog("handleXHttpEvent : url=" + request.url + ", type=" + type + ", readyState=" + xhttp.readyState + ", status=" + xhttp.status );
		var context, response;
		if( request[type] )
		{
			response = xhttp;
			response.lengthComputable = xhttp.lengthComputable || event.lengthComputable || false;
			response.loaded = xhttp.loaded || event.loaded || 0;
			response.total = xhttp.total || event.total || 0;
			response.url = xhttp.responseURL || request.url;
			
			context = request.context || response;
			request[type].call( context, response.responseText );
			if( type === 'onerror' || type === 'onload' ||
				(type === 'onreadystatechange' && response.readyState == 4 && response.status == 200 && !request.onload ) )
			{
				addXHttpResponse( (request.store ? response.responseText : undefined) );
				request_in_progress = false;
				request.delay = request.delay > 20 ? request.delay : 20;
				setTimeout( XHttpRequest, request.delay );
			}
		}
	}
	function initXHttpEvents( xhttp, request )
	{
		var types = [
			'onabort',
			'onerror',
			'onload',
			'onloadend',
			'onloadstart',
			'onprogress',
			'onreadystatechange',
			'ontimeout',
		];
		function addXHttpEventListener(type){
			if( request[type] )
				xhttp[type] = function XHttpEvents(event){handleXHttpEvent(type, xhttp, request, event);};
		}
		types.forEach( addXHttpEventListener );
		clog("initXHttpEvents: ", xhttp);
	}
	function initXHttp( xhttp, request )
	{
		initXHttpEvents( xhttp, request );
		for( let key in request.headers )
		{
			xhttp.setRequestHeader( key, request.headers[key] );
		}
	}
	function XHttpRequest()
	{
		var request, xhttp;
		request = getXHttpRequest();
		if( request && (request_in_progress === false || request.async === true) && queue.length > 0 )
		{
			clog("XHttpRequest");
			queue.shift();
			request_in_progress = true;
			xhttp = createXHttp();
			initXHttp( xhttp, request );
			clog("XHttpRequest : url=" + request.url + ", readyState=" + xhttp.readyState + ", status=" + xhttp.status );
			xhttp.open( request.method, request.url, request.async );
			xhttp.send( request.data || null );
		}
	}
	function addXHttpRequest( ...args )
	{
		var request, url, settings;
		switch( args.length )
		{
			case 0:
				return;
			case 1:
				request = args[0];
				clog("request: ", request);
				if( request.length )
					request.forEach( function(req){ queue.push(req);} );
				else
					queue.push(request);
				break;
			case 2:
				url = args[0];
				settings = args[1];
				clog("request: url=" + url + ", settings: ", settings);
				if( url.length )
					url.forEach( function(u){queue.push(constructXHttpRequest(u, settings));});
				else
					queue.push( constructXHttpRequest(url, settings) );
				break;
			default:
				return;
		}
		queue_cleaned = false;
	}
	function constructXHttpRequest( url, settings )
	{
		var request = createNewObject(settings);
		request.url = url;
		return request;
	}
	function cleanXHttpQueue()
	{
		xhttpResponse.length = 0;
		queue.length = 0;
		request_in_progress = false;
		queue_cleaned = true;
	}
	function queueLength()
	{
		return queue.length;
	}
	function getXHttpResponse(index)
	{
		if( !index || index < 0 )
			return xhttpResponse;
		else if( xhttpResponse.length > 0 )
			return xhttpResponse[index];
		else
			return {text: '', invalid: true, bytes:0, Kb: 0, Mb: 0};
	}
	window.SkIvLib = window.SkIvLib || {};
	// AJAX API
	SkIvLib.ajaxResponse = getXHttpResponse;
	SkIvLib.ajaxClean = cleanXHttpQueue;
	SkIvLib.ajaxLength = queueLength;
	SkIvLib.ajaxStatus = queueStatus;
	SkIvLib.ajaxAddXHR = addXHttpRequest;
	SkIvLib.ajax = function(...args)
	{
		xhttpResponse.length = 0;
		addXHttpRequest(...args);
		console.log("SkIvLib.ajax(): length = " + this.ajaxLength());
		XHttpRequest();
	};
})();