- Implements open tracking

lib/Config/Initializer.php

@@ -84,6 +84,7 @@ class Initializer {
     $newsletter_links = Env::$db_prefix . 'newsletter_links';
     $statistics_newsletters = Env::$db_prefix . 'statistics_newsletters';
     $statistics_clicks = Env::$db_prefix . 'statistics_clicks';
+    $statistics_opens = Env::$db_prefix . 'statistics_opens';
 
     define('MP_SETTINGS_TABLE', $settings);
     define('MP_SEGMENTS_TABLE', $segments);
@@ -101,6 +102,7 @@ class Initializer {
     define('MP_NEWSLETTER_OPTION_TABLE', $newsletter_option);
     define('MP_STATISTICS_NEWSLETTERS_TABLE', $statistics_newsletters);
     define('MP_STATISTICS_CLICKS_TABLE', $statistics_clicks);
+    define('MP_STATISTICS_OPENS_TABLE', $statistics_opens);
   }
 
   function runMigrator() {

lib/Config/Migrator.php

@@ -26,6 +26,7 @@ class Migrator {
       'forms',
       'statistics_newsletters',
       'statistics_clicks',
+      'statistics_opens'
     );
   }
 
@@ -293,6 +294,20 @@ class Migrator {
     return $this->sqlify(__FUNCTION__, $attributes);
   }
 
+  function statistics_opens() {
+    $attributes = array(
+      'id mediumint(9) NOT NULL AUTO_INCREMENT,',
+      'newsletter_id mediumint(9) NOT NULL,',
+      'subscriber_id mediumint(9) NOT NULL,',
+      'queue_id mediumint(9) NOT NULL,',
+      'created_at TIMESTAMP NOT NULL DEFAULT 0,',
+      'deleted_at TIMESTAMP NULL DEFAULT NULL,',
+      'updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,',
+      'PRIMARY KEY  (id)',
+    );
+    return $this->sqlify(__FUNCTION__, $attributes);
+  }
+
   private function sqlify($model, $attributes) {
     $table = $this->prefix . $model;
 

lib/Config/PublicAPI.php

@@ -2,6 +2,7 @@
 namespace MailPoet\Config;
 
 use MailPoet\Cron\Daemon;
+use MailPoet\Statistics\Track\Opens;
 use MailPoet\Subscription;
 use MailPoet\Statistics\Track\Clicks;
 use MailPoet\Util\Helpers;
@@ -54,6 +55,9 @@ class PublicAPI {
       if($this->action === 'click') {
         $track_class = new Clicks($this->data);
       }
+      if($this->action === 'open') {
+        $track_class = new Opens($this->data);
+      }
       if(!isset($track_class)) return;
       $track_class->track();
     } catch(\Exception $e) {

lib/Cron/Workers/SendingQueue.php

@@ -9,6 +9,7 @@ use MailPoet\Models\Setting;
 use MailPoet\Models\StatisticsNewsletters;
 use MailPoet\Models\Subscriber;
 use MailPoet\Newsletter\Links\Links;
+use MailPoet\Newsletter\Renderer\PostProcess\OpenTracking;
 use MailPoet\Newsletter\Renderer\Renderer;
 use MailPoet\Newsletter\Shortcodes\Shortcodes;
 use MailPoet\Util\Helpers;
@@ -74,6 +75,10 @@ class SendingQueue {
     // check if newsletter has been rendered, in which case return its contents
     // or render and save for future reuse
     if($queue->newsletter_rendered_body === null) {
+      // insert tracking code
+      add_filter('mailpoet_rendering_post_process', function($template) {
+        return OpenTracking::process($template);
+      });
       // render newsletter
       $rendered_newsletter = $this->renderNewsletter($newsletter);
       if((boolean) Setting::getValue('tracking.enabled')) {

lib/Models/StatisticsOpens.php

@@ -3,8 +3,8 @@ namespace MailPoet\Models;
 
 if(!defined('ABSPATH')) exit;
 
-class StatisticsClicks extends Model {
-  public static $_table = MP_STATISTICS_CLICKS_TABLE;
+class StatisticsOpens extends Model {
+  public static $_table = MP_STATISTICS_OPENS_TABLE;
 
   function __construct() {
     parent::__construct();

lib/Newsletter/Renderer/PostProcess/OpenTracking.php

@@ -2,12 +2,14 @@
 namespace MailPoet\Newsletter\Renderer\PostProcess;
 
 class OpenTracking {
-  static function process($template, $user_id) {
+  static function process($template) {
     $DOM = new \pQuery();
+    $DOM = $DOM->parseStr($template);
     $template = $DOM->query('body');
     $open_tracking_link = sprintf(
-      '<img alt="" src="%s/?mailpoet&endpoint=track&action=open&data=[mailpoet_data]',
-      home_url()
+      '<img alt="" class="" src="%s/%s"/>',
+      home_url(),
+      htmlentities('?mailpoet&endpoint=track&action=open&data=[mailpoet_data]')
     );
     $template->html($template->html() . $open_tracking_link);
     return $DOM->__toString();

lib/Statistics/Track/Opens.php

@@ -1,60 +1,39 @@
 <?php
 namespace MailPoet\Statistics\Track;
 
-use MailPoet\Models\NewsletterLink;
-use MailPoet\Models\StatisticsClicks;
+use MailPoet\Models\StatisticsOpens;
 use MailPoet\Models\Subscriber;
-use MailPoet\Subscription\Url as SubscriptionUrl;
-use MailPoet\Util\Helpers;
 
 if(!defined('ABSPATH')) exit;
 
 class Opens {
-  public $url;
+  public $data;
 
-  function __construct($url) {
-    $this->url = $url;
+  function __construct($data) {
+    $this->data = $data;
   }
 
-  function track($url = false) {
-    $url = ($url) ? $url : $this->url;
-    if(!preg_match('/\d+-\d+-\d+$/', $url)) $this->abort();
-    list ($newsletter_id, $subscriber_id, $queue_id) = explode('-', $url);
+  function track($data = false) {
+    $data = ($data) ? $data : $this->data;
+    if(!preg_match('/\d+-\d+-\d+/', $data)) $this->abort();
+    list ($newsletter_id, $subscriber_id, $queue_id) = explode('-', $data);
     $subscriber = Subscriber::findOne($subscriber_id);
     if(!$subscriber) return;
-    $statistics = StatisticsOpens::where('link_id', $link->id)
-      ->where('subscriber_id', $subscriber_id)
+    $statistics = StatisticsOpens::where('subscriber_id', $subscriber_id)
       ->where('newsletter_id', $newsletter_id)
       ->where('queue_id', $queue_id)
       ->findOne();
     if(!$statistics) {
-      $statistics = StatisticsClicks::create();
+      $statistics = StatisticsOpens::create();
       $statistics->newsletter_id = $newsletter_id;
-      $statistics->link_id = $link->id;
       $statistics->subscriber_id = $subscriber_id;
       $statistics->queue_id = $queue_id;
-      $statistics->count = 1;
-      $statistics->save();
-    } else {
-      $statistics->count++;
       $statistics->save();
     }
-    $url = (preg_match('/\[subscription:.*?\]/', $link->url)) ?
-      $this->processSubscriptionUrl($link->url, $subscriber) :
-      $link->url;
-    header('Location: ' . $url, true, 302);
-  }
-
-  function processSubscriptionUrl($url, $subscriber) {
-    preg_match('/\[subscription:(.*?)\]/', $url, $match);
-    $action = $match[1];
-    if(preg_match('/unsubscribe/', $action)) {
-      $url = SubscriptionUrl::getUnsubscribeUrl($subscriber);
-    }
-    if(preg_match('/manage/', $action)) {
-      $url = SubscriptionUrl::getManageUrl($subscriber);
-    }
-    return $url;
+    header('Content-Type: image/gif');
+    // return 1x1 pixel transparent gif image
+    echo "\x47\x49\x46\x38\x37\x61\x1\x0\x1\x0\x80\x0\x0\xfc\x6a\x6c\x0\x0\x0\x2c\x0\x0\x0\x0\x1\x0\x1\x0\x0\x2\x2\x44\x1\x0\x3b";
+    exit;
   }
 
   private function abort() {