<?php
/**
 * 1.每一個應用都要包含uc_client，下面拿uchome程式碼舉例
 * 2.uchome登陸時訪問source/do_login.php 的getpassport函式,getpassport通過uc_client 直接連ucenter的資料庫，實現當前站點的登陸
 * 3.uchome然後呼叫$ucsynlogin = uc_user_synlogin ( $setarr ['uid'] );
 * 4.實現跨域登陸
 * 
 */

//跨越請求api
function uc_user_synlogin($uid) {
	return  uc_api_post('user', 'synlogin', array('uid'=>$uid));
}

//組裝引數
function uc_api_post($module, $action, $arg = array()) {
	
	$s = $sep = '';
	foreach($arg as $k => $v) {
		if(is_array($v)) {
			$s2 = $sep2 = '';
			foreach($v as $k2=>$v2) {
				$s2 .= "$sep2{$k}[$k2]=".urlencode(uc_stripslashes($v2));
				$sep2 = '&';
			}
			$s .= $sep.$s2;
		} else {
			$s .= "$sep$k=".urlencode(uc_stripslashes($v));
		}
		$sep = '&';
	}
	$postdata = uc_api_requestdata($module, $action, $s);  //組裝引數構造請求地址
	
	return uc_fopen2(UC_API.'/index.php', 500000, $postdata, '', TRUE, UC_IP, 20);
}

//組裝請求地址
function uc_api_requestdata($module, $action, $arg='', $extra='') {
	$input = uc_api_input($arg);
	$post = "m=$module&a=$action&inajax=2&input=$input&appid=".UC_APPID.$extra;
	return $post;
}
 
//在uc_user_synlogin函式裡再用uc_client/client.php的fsockopen去訪問ucenter下的index.php預設超時15秒
 
function uc_fopen2($url, $limit = 0, $post = '', $cookie = '', $bysocket = FALSE, $ip = '', $timeout = 15, $block = TRUE) {
	$__times__ = isset($_GET['__times__']) ? intval($_GET['__times__']) + 1 : 1;
	if($__times__ > 2) {
		return '';
	}
	$url .= (strpos($url, '?') === FALSE ? '?' : '&')."__times__=$__times__";
	return uc_fopen($url, $limit, $post, $cookie, $bysocket, $ip, $timeout, $block);
}

//fsockopen請求
function uc_fopen($url, $limit = 0, $post = '', $cookie = '', $bysocket = FALSE, $ip = '', $timeout = 15, $block = TRUE) {
	$return = '';
	$matches = parse_url($url);
	!isset($matches['host']) && $matches['host'] = '';
	!isset($matches['path']) && $matches['path'] = '';
	!isset($matches['query']) && $matches['query'] = '';
	!isset($matches['port']) && $matches['port'] = '';
	$host = $matches['host'];
	$path = $matches['path'] ? $matches['path'].($matches['query'] ? '?'.$matches['query'] : '') : '/';
	$port = !empty($matches['port']) ? $matches['port'] : 80;
	if($post) {
		$out = "POST $path HTTP/1.0\r\n";
		$out .= "Accept: */*\r\n";
		//$out .= "Referer: $boardurl\r\n";
		$out .= "Accept-Language: zh-cn\r\n";
		$out .= "Content-Type: application/x-www-form-urlencoded\r\n";
		$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
		$out .= "Host: $host\r\n";
		$out .= 'Content-Length: '.strlen($post)."\r\n";
		$out .= "Connection: Close\r\n";
		$out .= "Cache-Control: no-cache\r\n";
		$out .= "Cookie: $cookie\r\n\r\n";
		$out .= $post;
	} else {
		$out = "GET $path HTTP/1.0\r\n";
		$out .= "Accept: */*\r\n";
		//$out .= "Referer: $boardurl\r\n";
		$out .= "Accept-Language: zh-cn\r\n";
		$out .= "User-Agent: $_SERVER[HTTP_USER_AGENT]\r\n";
		$out .= "Host: $host\r\n";
		$out .= "Connection: Close\r\n";
		$out .= "Cookie: $cookie\r\n\r\n";
	}
	$fp = @fsockopen(($ip ? $ip : $host), $port, $errno, $errstr, $timeout);
	if(!$fp) {
		return '';
	} else {
		stream_set_blocking($fp, $block);
		stream_set_timeout($fp, $timeout);
		@fwrite($fp, $out);
		$status = stream_get_meta_data($fp);
		if(!$status['timed_out']) {
			while (!feof($fp)) {
				if(($header = @fgets($fp)) && ($header == "\r\n" ||  $header == "\n")) {
					break;
				}
			}
			$stop = false;
			while(!feof($fp) && !$stop) {
				$data = fread($fp, ($limit == 0 || $limit > 8192 ? 8192 : $limit));
				$return .= $data;
				if($limit) {
					$limit -= strlen($data);
					$stop = $limit <= 0;
				}
			}
		}
		@fclose($fp);
		return $return;
	}
}
 
//在ucenter下的index.php根據請求的model和action和appid請求control/user.php 的onsynlogin函式
function onsynlogin() {
	$this->init_input();
	if($this->app['synlogin']) {
		if($this->user = $_ENV['user']->get_user_by_uid($this->input['uid'])) {
			$synstr = '';
			foreach($this->cache['apps'] as $appid => $app) {
				if($app['synlogin'] && $app['appid'] != $this->app['appid']) {
					$synstr .= '<script type="text/javascript" src="'.$app['url'].'/api/uc.php?time='.$this->time.'&code='.urlencode($this->authcode('action=synlogin&username='.$this->user['username'].'&uid='.$this->user['uid'].'&password='.$this->user['password']."&time=".$this->time, 'ENCODE', $app['authkey'])).'"></script>';
				}
			}
			exit("$synstr");
		}
	}
}
 
// onsynlogin函式通過迴圈，對系統下的所有應用（在data/cache/setting.php）做JS呼叫
$synstr .= '<script type="text/javascript" src="'.$app['url'].'/api/uc.php?time='.$this->time.'&code='.urlencode($this->authcode('action=synlogin&username='.$this->user['username'].'&uid='.$this->user['uid'].'&password='.$this->user['password']." mce_src="'.$app['url'].'/api/uc.php?time='.$this->time.'&code='.urlencode($this->authcode('action=synlogin&username='.$this->user['username'].'&uid='.$this->user['uid'].'&password='.$this->user['password']."&time=".$this->time, 'ENCODE', $app['authkey'])).'"></script>';

//返回到uchome.在每個應用下的api目錄有個uc.php檔案查詢$action == 'synlogin'下面是進行cookie設定
//obclean();
//header('P3P: CP="CURa ADMa DEVa PSAo PSDo OUR BUS UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"');
//這兩行是必須的
//下面setcookie設定cookie
//這樣就在所有ucenter知道的應用下添加了cookie實現了跨域登陸