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<?php

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    highlight_file(__FILE__);
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}

/*
*
* This script is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General public License for more details.
*
* This copyright notice MUST APPEAR in all copies of the script!
*
*  @author            CERDAN Yohann <cerdanyohann@yahoo.fr>
*  @copyright      (c) 2009  CERDAN Yohann, All rights reserved
*  @ version         12:38 04/08/2009
*/

class GoogleAnalyticsAPI
{
        /** Google account login (email) **/
        private $login;
        
        /** Google account password **/
        private $password;
        
        /** Google analytics website ID (avalaible on your google analytics account url) **/
        private $ids;
        
        /** The login token to the google analytics service **/
        private $loginToken;
        
        /** The XML response send by the service **/
        private $response;
        
        /** Begin date of the displaying datas **/
        private $date_begin;
        
        /** End date of the displaying datas **/
        private $date_end;
        
        /** Sort the results **/
        private $sort;
        
        /** The param to sort (metrics or dimensions) **/
        private $sort_param;
        
        /**
          * Class constructor
          * 
          * @param string $login the login (email)
          * @param string $password the password
          * @param string $ids the IDs of the website (find it in the google analytics gui)
          * @param string $date_begin the begin date
          * @param string $date_end the end date
          * 
          * @return void
          */
                  
        public function __construct($login,$password,$ids,$date_begin,$date_end = null)
        {
                $this->login = $login;
                $this->password = $password;
                $this->ids = $ids;
                $this->date_begin = $date_begin;
                
                if (!$date_end) {
                        $this->date_end = $date_begin;
                } else {
                        $this->date_end = $date_end;
                }
                
                $this->sort = "-";
                $this->sort_param = "metrics";
                
                // Authentication
                $this->login();
        }
        
        /**
          * Set the result's sort by metrics
          * 
          * @param boolean $sort asc or desc sort
          * 
          * @return void
          */
                  
        public function setSortByMetrics ($sort)
        {
                if ($sort==true) {
                        $this->sort = "";
                } else {
                        $this->sort = "-";
                }
                $this->sort_param = 'metrics';
        }
        
        /**
          * Set the result's sort by dimensions
          * 
          * @param boolean $sort asc or desc sort
          * 
          * @return void
          */
                  
        public function setSortByDimensions ($sort)
        {
                if ($sort==true) {
                        $this->sort = "";
                } else {
                        $this->sort = "-";
                }
                $this->sort_param = 'dimensions';
        }
        
        /**
          * Set the IDs of the website
          * 
          * @param string $ids the IDs of the website (find it in the google analytics gui)
          * 
          * @return void
          */
                  
        public function setIds($ids)
        {
                $this->ids = $ids;
        }
        
        /**
          * Set the date of the export
          * 
          * @param string $date_begin the begin date
          * @param string $date_end the end date
          * 
          * @return void
          */
                  
        public function setDate ($date_begin,$date_end = null)
        {
                $this->date_begin = $date_begin;
                
                if (!$date_end) {
                        $this->date_end = $date_begin;
                } else {
                        $this->date_end = $date_end;
                }
        }
        
        /**
          * Login to the google server
          * See : http://google-data-api.blogspot.com/2008/05/clientlogin-with-php-curl.html
          * 
          * @return void
          */
        
        private function login()
        {
                $ch = curl_init();  
                curl_setopt($ch, CURLOPT_URL, "https://www.google.com/accounts/ClientLogin");  
                curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);  
                  
                $data = array('accountType' => 'GOOGLE',  
                                  'Email' => $this->login,  
                                  'Passwd' => $this->password,  
                                  'source'=>'php_curl_analytics',  
                                  'service'=>'analytics');  

                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);  
                curl_setopt($ch, CURLOPT_POST, true);  
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
                curl_setopt($ch, CURLOPT_POSTFIELDS, $data);  

                $hasil = curl_exec($ch);  
                curl_close($ch);
                
                // Get the login token
                // SID=DQA...oUE  
                // LSID=DQA...bbo  
                // Auth=DQA...Sxq  
                if (preg_match('/Auth=(.*)$/',$hasil,$matches)>0) {
                        $this->loginToken = $matches[1];
                } else {
                        trigger_error('Authentication problem',E_USER_WARNING);
                        return null;
                }
        }
        
        /**
           * Get URL content using cURL.
          * 
          * @param string $url the url 
          * 
          * @return string the html code
          */
                  
        function getContent ($url) 
        {
                if (!extension_loaded('curl')) {
            throw new Exception('curl extension is not available');
        }
                
                $ch = curl_init($url); 
                
                $header[] = 'Authorization: GoogleLogin auth=' . $this->loginToken;

                curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);  
                curl_setopt($ch, CURLOPT_HTTPHEADER, $header);  
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
                curl_setopt($ch, CURLOPT_HEADER, false); 
                  
                $this->response = curl_exec($ch); 
                $infos = curl_getinfo($ch);
                curl_close($ch);
                
                return $infos['http_code'];
        }
        
        /**
          * Get the google analytics datas by dimensions and metrics
          * See : http://code.google.com/intl/fr/apis/analytics/docs/gdata/gdataReferenceDimensionsMetrics.html
          * 
          * @param string $metrics the metrics
          * @param string $dimensions the dimensions
          * 
          * @return array
          */
                  
        public function getDimensionByMetric($metrics, $dimensions)
        {
                $url = "https://www.google.com/analytics/feeds/data?ids=ga:" . $this->ids . "&metrics=ga:" . $metrics . "&dimensions=ga:" . $dimensions . "&start-date=" . $this->date_begin . "&end-date=" . $this->date_end ."&sort=" . $this->sort . "ga:";
                
                if ($this->sort_param=='metrics') { // sort by metrics
                        $url .= $metrics;
                }
                
                if ($this->sort_param=='dimensions') { // sort by dimensions
                        $url .= $dimensions;
                }

                if($this->getContent($url) == 200) {
                        $XML_object = simplexml_load_string($this->response);
                        $labels_array = array();
                        $datas_array = array();
                        
                        foreach($XML_object->entry as $m) {
                                $dxp = $m->children('http://schemas.google.com/analytics/2009');
                                $metric_att = $dxp->metric->attributes();
                                $dimension_att = $dxp->dimension->attributes();
                                $labels_array []= $dimension_att['value'] . ' (' . $metric_att['value'] . ')';
                                $datas_array  []= (string)$metric_att['value'];
                        }
                        
                        return array('labels' => $labels_array, 'datas' => $datas_array);
                } else {
                        return null;
                }
        }
        
        /**
          * Get the google analytics datas by metrics
          * See : http://code.google.com/intl/fr/apis/analytics/docs/gdata/gdataReferenceDimensionsMetrics.html
          * 
          * @param string $metrics the metrics
          * @param string $uri the url of the website page (ex : /myurl/)
          * 
          * @return array
          */
                  
        public function getMetric($metric,$uri=null)
        {
                $url = "https://www.google.com/analytics/feeds/data?ids=ga:" . $this->ids . "&metrics=ga:" . $metric . "&start-date=" . $this->date_begin . "&end-date=" . $this->date_end;  

                if ($uri) {
                        $url .= "&dimensions=ga:pagePath&filters=ga:pagePath%3D%3D" . $uri;
                }
                
                if($this->getContent($url) == 200) {
                        $XML_object = simplexml_load_string($this->response);
                        $dxp = $XML_object->entry->children('http://schemas.google.com/analytics/2009');
                        if (@count($dxp)>0) {
                                $metric_att = $dxp->metric->attributes();
                        }
                        return $metric_att['value'] ? (string)$metric_att['value'] : 0;
                } else {
                        return null;
                }
        }
                
}

?>