通过简单实例讲解QQ开放平台登录原理
这个实例是用PHP来开发，用的是CI的框架结构，没接触过CI的朋友也不要着急，这个框架和其它框架的原理是一样的，因此代码阅读起来不会有困难。
首先，代码文件分为三个文件，①client.php ②client_view.php ③server.php
先来讲一下简单的原理，再给出代码和注解。
原理：我们以QQ开放平台登录为例，其实不光QQ平台，其它任何平台原理基本上是一样的，只不过可能数据处理方式上有所差异。首先，我们将登录程序定义为客户端CLIENT端，QQ服务端定因为服务器端，我们在登陆QQ的时候，会通过我们的程序也就是浏览器发送一个请求给QQ服务器，当然你输入的ID和PASSWORD以及其他的PROFILE都是发送给服务端的参数，QQ服务端在受到CLIENT端的请求之后，接收到CLIENT的REQUEST和PARAMETERS之后，将你的ID和PASSWORD以及附加PROFILE与数据库中的相关数据进行比较，如果比较结果通过，那么QQ服务器端会将这个的相关资料数据发送给CLIENT，当然加密细节就不说了，CLIENT接收到之后对数据进行处理和提取，得到自己想要的数据，后续的工作就看CLIENT的需求了。基本原理就是这样的。好了，废话不说，代码给出。
①client.php
<?php
class Client extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->helper('url');
$this->load->library('xmlrpc');
$this->xmlrpc->set_debug(TRUE);
}
public function index()
{
$data['title'] = 'xmlrpc';
$data['heading'] = 'Welcome to xmlrpc client';
$this->load->view('client_view.php', $data);
}
public function request()
{
$data['title'] = 'xmlrpc';
$data['heading'] = 'xmlrpc server response';
$server_url = site_url('server');
$this->xmlrpc->server($server_url, 80);
$this->xmlrpc->method($this->uri->segment(3));
switch($this->uri->segment(3))
{
case 'login':
$request = array(
array(
array('request' => 'login'),
'struct'),
array(
array('username' => 'inan',
'password' => sha1('inan')),
'struct')
);
break;
case 'add':
$request = array(
array(
array('request' => 'add'),
'struct'),
array(
array('username' => 'newuser',
'password' => sha1('newuser')),
'struct')
);
break;
case 'search':
$request = array(
array(
array('request' => 'search'),
'struct'),
array(
array('username' => 'inan'),
'struct')
);
break;
default:
$request = NULL;
}
if(is_array($request))
{
$this->xmlrpc->request($request);
if(! $this->xmlrpc->send_request())
{
$data['response'] = $this->xmlrpc->display_error();
}
else
{
$data['response'] = $this->xmlrpc->display_response();
}
}
else
{
$data['response'] = array('Invalid request');
}
$this->load->view('xmlrpc_response_view.php', $data);
}
}
②client_view.php
<html>
<head>
<title><?php echo $title; ?></title>
</head>
<body>
<h1><?php echo $heading; ?></h1>
<p>All variables set in controllers though.</p>
<p>
<?php
echo anchor('client/request/login', 'Login');
echo '<br />';
echo anchor('client/request/add', 'Add');
echo '<br />';
echo anchor('client/request/search', 'Search');
?>
</p>
</body>
</html>
③server.php
<?php
class Server extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->library('xmlrpc');
$this->load->library('xmlrpcs');
$this->load->model('database_model');
}
function index()
{
$config['functions']['login'] = array('function' => 'server.user_login');
$config['functions']['add'] = array('function' => 'server.user_add');
$config['functions']['search'] = array('function' => 'server.user_search');
$this->xmlrpcs->initialize($config);
$this->xmlrpcs->serve();
}
public function user_login($request)
{
$parameters = $request->output_parameters();
$uid = $this->security->xss_clean($parameters['1']['username']);
$psw = $this->security->xss_clean($parameters['1']['password']);
$result = $this->database_model->user_login($uid, $psw);
if($result->num_rows() == 1)
{
$response = array(
array('REQUEST' => array($parameters['0']['request'], 'string'),
'RESPONSE' => array('successful', 'string')),
'struct');
return $this->xmlrpc->send_response($response);
}
else
{
return $this->xmlrpc->send_error_message('100', 'fail');
}
}
public function user_add($request)
{
$parameters = $request->output_parameters();
$uid = $this->security->xss_clean($parameters['1']['username']);
$psw = $this->security->xss_clean($parameters['1']['password']);
$result = $this->database_model->user_add($uid, $psw);
if($this->db->affected_rows() == 1)
{
$response = array(
array('REQUEST' => array($parameters['0']['request'], 'string'),
'RESPONSE' => array('successful', 'string')),
'struct');
return $this->xmlrpc->send_response($response);
}
else
{
return $this->xmlrpc->send_error_message('100', 'fail');
}
}
public function user_search($request)
{
$parameters = $request->output_parameters();
$uid = $this->security->xss_clean($parameters['1']['username']);
$result = $this->database_model->user_search($uid);
if($result->num_rows() > 0)
{
$user_list = array();
foreach($result->result() as $row)
{
$user_list[] = array(
array('USERNAME' => array($row->username, 'string'),
'PASSWORD' => array($row->password, 'string')),
'struct');
}
$response = array($user_list, 'array');
return $this->xmlrpc->send_response($response);
}
else
{
return $this->xmlrpc->send_error_message('100', 'fail');
}
}
}