本文给出了 PHPRPC 2.1 协议的 Ajax 客户端实现。该客户端的使用方式与 2.0 版本的使用方式基本上相同。不同点在于如果要调用的远程函数是引用参数传递的话，需要在调用前设置该函数的 ref 属性为 true。该属性表示是否是引用参数传递。该属性默认为 false。推荐在客户端对象的 onready 事件中进行设置。
下面为该客户端的实现代码：
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/* phprpc_ajax_client.js - Ajax PHPRPC Client
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*
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* Copyright Ma Bingyao <andot@ujn.edu.cn>
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* Version: 2.1
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* LastModified: 2006-03-12
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* This library is free. You can redistribute it and/or modify it.
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*/
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/*
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* Interfaces:
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* phprpc_client.create('rpc');
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* rpc.use_service('http://domain.com/phprpc/server.php');
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* rpc.method_callback = function(result, args, output) {
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* if (result instanceof phprpc_error) {
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* alert(result.errstr);
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* }
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* else {
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* alert(result); // or do any other things.
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* }
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* }
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* ....
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* if (rpc.ready) rpc.method();
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*/
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function phprpc_error(errno, errstr) {
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this.errno = errno;
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this.errstr = errstr;
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}
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function phprpc_client() {
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this.__php = new PHP_Serializer();
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this.__url = '';
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this.__encrypt = false;
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this.encrypt = 0;
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this.async = true;
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this.ready = false;
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this.args = null;
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this.output = "";
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this.use_service = function (url, encrypt) {
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if (typeof(encrypt) == "undefined") {
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encrypt = this.__encrypt;
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}
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if (typeof(this.__name) == "undefined") {
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return false;
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}
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this.__url = url;
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var xmlhttp = this.__create_xmlhttp();
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var __rpc = this;
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if (encrypt === true) {
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xmlhttp.onreadystatechange = function () {
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if (xmlhttp.readyState == 4) {
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if (xmlhttp.responseText) {
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eval(xmlhttp.responseText);
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if (typeof(phprpc_encrypt) == "undefined") {
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__rpc.__encrypt = false;
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__rpc.use_service(__rpc.__url);
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}
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else {
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__rpc.__encrypt = __rpc.__php.unserialize(phprpc_encrypt);
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__rpc.__encrypt['p'] = dec2num(__rpc.__encrypt['p']);
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__rpc.__encrypt['g'] = dec2num(__rpc.__encrypt['g']);
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__rpc.__encrypt['y'] = dec2num(__rpc.__encrypt['y']);
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__rpc.__encrypt['x'] = rand(127, 1);
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var key = pow_mod(__rpc.__encrypt['y'],
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__rpc.__encrypt['x'],
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__rpc.__encrypt['p']);
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key = num2str(key);
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for (var i = 0; i < 16 - key.length; i++) {
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key = '\0' + key;
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}
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__rpc.__encrypt['k'] = key;
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var encrypt = pow_mod(__rpc.__encrypt['g'],
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__rpc.__encrypt['x'],
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__rpc.__encrypt['p']);
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__rpc.use_service(__rpc.__url, num2dec(encrypt).replace(/\+/g, '%2B'));
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}
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}
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delete(xmlhttp);
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}
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}
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}
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else {
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xmlhttp.onreadystatechange = function () {
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if (xmlhttp.readyState == 4) {
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if (xmlhttp.responseText) {
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eval(xmlhttp.responseText);
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var functions = __rpc.__php.unserialize(phprpc_functions);
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var func;
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for (var i = 0; i < functions.length; i++) {
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func = __rpc.__name + "." + functions[i] + " = function () {\r\n";
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func += " this.__call('" + functions[i] + "', this.__args_to_array(arguments));\r\n";
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func += "}\r\n";
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func += __rpc.__name + "." + functions[i] + ".ref = false;\r\n";
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eval(func);
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}
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__rpc.ready = true;
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if (typeof(__rpc.onready) == "function") {
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__rpc.onready();
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}
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}
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delete(xmlhttp);
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}
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}
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}
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xmlhttp.open("get", this.__url + '?phprpc_encrypt=' + encrypt + '&phprpc_encode=false', true);
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xmlhttp.send(null);
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};
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this.__call = function (func, args) {
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var __args = this.__php.serialize(args);
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if ((this.__encrypt !== false) && (this.encrypt > 0)) {
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__args = xxtea_encrypt(__args, this.__encrypt['k']);
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}
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__args = base64encode(__args);
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var request = 'phprpc_func=' + func
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+ '&phprpc_args=' + __args
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+ '&phprpc_encode=false'
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+ '&phprpc_encrypt=' + this.encrypt;
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var ref = eval(this.__name + "." + func + ".ref");
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if (!ref) {
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request += '&phprpc_ref=false';
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}
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var xmlhttp = this.__create_xmlhttp();
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var session = {'args': args, 'ref': ref, 'encrypt': this.encrypt};
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if (this.async) {
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var __rpc = this;
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xmlhttp.onreadystatechange = function () {
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if (xmlhttp.readyState == 4) {
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if (xmlhttp.responseText) {
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__rpc.__get_result(xmlhttp, session);
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if (typeof(eval(__rpc.__name + "." + func + "_callback")) == "function") {
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eval(__rpc.__name + "." + func + "_callback(phprpc_result, phprpc_args, phprpc_output);");
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}
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}
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delete(xmlhttp);
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}
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}
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}
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xmlhttp.open("post", this.__url, this.async);
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xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
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xmlhttp.send(request.replace(/\+/g, '%2B'));
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if (!this.async) {
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if (xmlhttp.responseText) {
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this.__get_result(xmlhttp, session);
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this.output = phprpc_output;
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this.args = phprpc_args;
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return phprpc_result;
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}
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else {
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return new phprpc_error(1, "No data received from server");
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}
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delete(xmlhttp);
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}
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};
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this.__get_result = function (xmlhttp, session) {
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eval(xmlhttp.responseText);
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if (phprpc_errno == 0) {
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if ((this.__encrypt !== false) && (session.encrypt > 0)) {
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if (session.encrypt > 1) {
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phprpc_result = xxtea_decrypt(phprpc_result, this.__encrypt['k']);
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}
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if (session.ref) {
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phprpc_args = xxtea_decrypt(phprpc_args, this.__encrypt['k']);
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}
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}
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phprpc_result = this.__php.unserialize(phprpc_result);
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if (session.ref) {
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phprpc_args = this.__php.unserialize(phprpc_args);
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}
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else {
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phprpc_args = this.args;
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}
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}
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else {
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phprpc_result = new phprpc_error(phprpc_errno, phprpc_errstr);
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phprpc_args = null;
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}
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}
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// the function __create_xmlhttp modified from
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this.__create_xmlhttp = function() {
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if (window.XMLHttpRequest) {
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var objXMLHttp = new XMLHttpRequest();
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// some older versions of Moz did not support the readyState property
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// and the onreadystate event so we patch it!
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if (objXMLHttp.readyState == null) {
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objXMLHttp.readyState = 0;
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objXMLHttp.addEventListener(
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"load",
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function () {
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objXMLHttp.readyState = 4;
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if (typeof(objXMLHttp.onreadystatechange) == "function") {
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objXMLHttp.onreadystatechange();
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}
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},
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false
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);
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}
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return objXMLHttp;
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}
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else {
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var MSXML = ['MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
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for(var n = 0; n < MSXML.length; n ++) {
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try {
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return objXMLHttp = new ActiveXObject(MSXML[n]);
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}
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catch(e) {}
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}
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throw new Error("Your browser does not support xmlhttp objects");
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}
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};
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this.__args_to_array = function (args) {
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argArray = [];
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for (i = 0; i < args.length; i++) {
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argArray[i] = args[i];
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}
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return argArray;
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}
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}
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phprpc_client.create = function (name, encrypt) {
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eval(name + ' = new phprpc_client();');
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eval(name + '.__name = "' + name + '";');
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if (encrypt) {
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encrypt = true;
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eval(name + '.__encrypt = ' + encrypt + ';');
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}
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}