<?php

namespace Cas\Controller;

use KIF\Cache\Memcached;
use KIF\Core\Controller;
use KIF\Core\Request;
use Cas\Module\RefreshAccessToken;
use KIF\Core\Config;

/**
 * WeixinJsSDK 用于微信　js　调用　
 * 吐出相应数据
 * 可查看：http://mp.weixin.qq.com/wiki/7/aaa137b55fb2e0456bf8dd9148dd613f.html
 *
 * @author lihuanchun
 *        
 */
class WeixinJsSDK extends Controller {
	private $objMemache;
	public function __construct() {
		$this->objMemache = new Memcached ();
	}
	
	/**
	 * ajax 返回微信所需js配置信息
	 * http://cas.lishuy.com/?c=WeixinJsSDK&a=AjaxConfigData
	 */
	public function doAjaxConfigData() {
		$thisPageUrl = Request::g ( 'thisPageUrl' );
		$returnData = $this->getSignPackage ( $thisPageUrl );
		$this->ajax_success_exit ( $returnData );
	}
	
	/**
	 * getSignPackage
	 */
	private function getSignPackage($url = null) {
		$wechat_cfg = Config::getInstance ()->get ( 'wechat_cfg' );
		$appid = $wechat_cfg ['appId'];
		
		$jsapiTicket = $this->getJsApiTicket ();
		if ($url == null) {
			$url = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
		} else {
			$url = htmlspecialchars_decode ( $url );
		}
		
		$timestamp = time ();
		$nonceStr = $this->createNonceStr ();
		$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
		$signature = sha1 ( $string );
		$signPackage = array (
				"appId" => $appid,
				"nonceStr" => $nonceStr,
				"timestamp" => $timestamp,
				"url" => $url,
				"signature" => $signature,
				"rawString" => $string 
		);
		return $signPackage;
	}
	
	/**
	 * createNonceStr
	 */
	private function createNonceStr($length = 16) {
		$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
		$str = "";
		for($i = 0; $i < $length; $i ++) {
			$str .= substr ( $chars, mt_rand ( 0, strlen ( $chars ) - 1 ), 1 );
		}
		return $str;
	}
	
	/**
	 * getJsApiTicket
	 */
	private function getJsApiTicket() {
		$ticket = $this->objMemache->get ( RefreshAccessToken::JSAPI_TICKET_KEY );
		return $ticket;
	}
	
	/*
	 * (non-PHPdoc)
	 * @see \KIF\Core\Controller::run()
	 */
	public function run() {
		$action = $this->action;
		$this->$action ();
	}
}