<?php


// +----------------------------------------------------------------------


// | TOPThink [ WE CAN DO IT JUST THINK ]


// +----------------------------------------------------------------------


// | Copyright (c) 2010 http://topthink.com All rights reserved.


// +----------------------------------------------------------------------


// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )


// +----------------------------------------------------------------------


// | Author: 麦当苗儿 <zuojiazi.cn@gmail.com> <http://www.zjzit.cn>


// +----------------------------------------------------------------------


// | ThinkOauth.class.php 2013-02-25


// +----------------------------------------------------------------------





abstract class ThinkOauth{


	/**


	 * oauth版本


	 * @var string


	 */


	protected $Version = '2.0';


	


	/**


	 * 申请应用时分配的app_key


	 * @var string


	 */


	protected $AppKey = '';


	


	/**


	 * 申请应用时分配的 app_secret


	 * @var string


	 */


	protected $AppSecret = '';


	


	/**


	 * 授权类型 response_type 目前只能为code


	 * @var string


	 */


	protected $ResponseType = 'code';


	


	/**


	 * grant_type 目前只能为 authorization_code


	 * @var string 


	 */


	protected $GrantType = 'authorization_code';


	


	/**


	 * 回调页面URL  可以通过配置文件配置


	 * @var string


	 */


	protected $Callback = '';


	


	/**


	 * 获取request_code的额外参数 URL查询字符串格式


	 * @var srting


	 */


	protected $Authorize = '';


	


	/**


	 * 获取request_code请求的URL


	 * @var string


	 */


	protected $GetRequestCodeURL = '';


	


	/**


	 * 获取access_token请求的URL


	 * @var string


	 */


	protected $GetAccessTokenURL = '';





	/**


	 * API根路径


	 * @var string


	 */


	protected $ApiBase = '';


	


	/**


	 * 授权后获取到的TOKEN信息


	 * @var array


	 */


	protected $Token = null;





	/**


	 * 调用接口类型


	 * @var string


	 */


	private $Type = '';


	


	/**


	 * 构造方法，配置应用信息


	 * @param array $token 


	 */


	public function __construct($token = null){


		//设置SDK类型


		$class = get_class($this);


		$this->Type = strtoupper(substr($class, 0, strlen($class)-3));





		//获取应用配置


		$config = C("THINK_SDK_{$this->Type}");


		if(empty($config['APP_KEY']) || empty($config['APP_SECRET'])){


			throw new Exception('请配置您申请的APP_KEY和APP_SECRET');


		} else {


			$this->AppKey    = $config['APP_KEY'];


			$this->AppSecret = $config['APP_SECRET'];


			$this->Token     = $token; //设置获取到的TOKEN


		}


	}





	/**


     * 取得Oauth实例


     * @static


     * @return mixed 返回Oauth


     */


    public static function getInstance($type, $token = null) {


    	$name = ucfirst(strtolower($type)) . 'SDK';


    	require_once "sdk/{$name}.class.php";


    	if (class_exists($name)) {

    		return new $name($token);


    	} else {


    		E(L('_CLASS_NOT_EXIST_') . ':' . $name);


    	}


    }





	/**


	 * 初始化配置


	 */


	private function config(){


		$config = C("THINK_SDK_{$this->Type}");


		if(!empty($config['AUTHORIZE']))


			$this->Authorize = $config['AUTHORIZE'];


		if(!empty($config['CALLBACK']))


			$this->Callback = $config['CALLBACK'];


		else


			throw new Exception('请配置回调页面地址');


	}


	


	/**


	 * 请求code 


	 */


	public function getRequestCodeURL(){


		$this->config();


		//Oauth 标准参数


		$params = array(


			'client_id'     => $this->AppKey,


			'redirect_uri'  => $this->Callback,


			'response_type' => $this->ResponseType,


		);


		


		//获取额外参数


		if($this->Authorize){


			parse_str($this->Authorize, $_param);


			if(is_array($_param)){


				$params = array_merge($params, $_param);


			} else {


				throw new Exception('AUTHORIZE配置不正确！');


			}


		}

		return $this->GetRequestCodeURL . '?' . http_build_query($params);


	}


	


	/**


	 * 获取access_token


	 * @param string $code 上一步请求到的code


	 */


	public function getAccessToken($code, $extend = null){


		$this->config();


		$params = array(


				'client_id'     => $this->AppKey,


				'client_secret' => $this->AppSecret,


				'grant_type'    => $this->GrantType,


				'code'          => $code,


				'redirect_uri'  => $this->Callback,


		);



		$data = $this->http($this->GetAccessTokenURL, $params, 'POST');


		$this->Token = $this->parseToken($data, $extend);


		return $this->Token;


	}





	/**


	 * 合并默认参数和额外参数


	 * @param array $params  默认参数


	 * @param array/string $param 额外参数


	 * @return array:


	 */


	protected function param($params, $param){


		if(is_string($param))


			parse_str($param, $param);


		return array_merge($params, $param);


	}





	/**


	 * 获取指定API请求的URL


	 * @param  string $api API名称


	 * @param  string $fix api后缀


	 * @return string      请求的完整URL


	 */


	protected function url($api, $fix = ''){


		return $this->ApiBase . $api . $fix;


	}


	


	/**


	 * 发送HTTP请求方法，目前只支持CURL发送请求


	 * @param  string $url    请求URL


	 * @param  array  $params 请求参数


	 * @param  string $method 请求方法GET/POST


	 * @return array  $data   响应数据


	 */


	protected function http($url, $params, $method = 'GET', $header = array(), $multi = false){


		$opts = array(


			CURLOPT_TIMEOUT        => 30,


			CURLOPT_RETURNTRANSFER => 1,


			CURLOPT_SSL_VERIFYPEER => false,


			CURLOPT_SSL_VERIFYHOST => false,


			CURLOPT_HTTPHEADER     => $header


		);





		/* 根据请求类型设置特定参数 */

		switch(strtoupper($method)){


			case 'GET':


				$opts[CURLOPT_URL] = $url . '?' . http_build_query($params);


				break;


			case 'POST':


				//判断是否传输文件


				$params = $multi ? $params : http_build_query($params);


				$opts[CURLOPT_URL] = $url;


				$opts[CURLOPT_POST] = 1;


				$opts[CURLOPT_POSTFIELDS] = $params;


				break;


			default:


				throw new Exception('不支持的请求方式！');


		}


		


		/* 初始化并执行curl请求 */


		$ch = curl_init();

		curl_setopt_array($ch, $opts);


		$data  = curl_exec($ch);


		$error = curl_error($ch);


		curl_close($ch);


		if($error) throw new Exception('请求发生错误：' . $error);


		return  $data;


	}


	


	/**


	 * 抽象方法，在SNSSDK中实现


	 * 组装接口调用参数 并调用接口


	 */


	abstract protected function call($api, $param = '', $method = 'GET', $multi = false);


	


	/**


	 * 抽象方法，在SNSSDK中实现


	 * 解析access_token方法请求后的返回值


	 */


	abstract protected function parseToken($result, $extend);


	


	/**


	 * 抽象方法，在SNSSDK中实现


	 * 获取当前授权用户的SNS标识


	 */


	abstract public function openid();	


}