- Implements post-processing filter during rendering

lib/Models/StatisticsOpens.php

@@ -0,0 +1,12 @@
+<?php
+namespace MailPoet\Models;
+
+if(!defined('ABSPATH')) exit;
+
+class StatisticsClicks extends Model {
+  public static $_table = MP_STATISTICS_CLICKS_TABLE;
+
+  function __construct() {
+    parent::__construct();
+  }
+}

lib/Newsletter/Renderer/PostProcess/OpenTracking.php

@@ -0,0 +1,15 @@
+<?php
+namespace MailPoet\Newsletter\Renderer\PostProcess;
+
+class OpenTracking {
+  static function process($template, $user_id) {
+    $DOM = new \pQuery();
+    $template = $DOM->query('body');
+    $open_tracking_link = sprintf(
+      '<img alt="" src="%s/?mailpoet&endpoint=track&action=open&data=[mailpoet_data]',
+      home_url()
+    );
+    $template->html($template->html() . $open_tracking_link);
+    return $DOM->__toString();
+  }
+}

lib/Newsletter/Renderer/Renderer.php

@@ -102,6 +102,10 @@ class Renderer {
     $template->html(
       str_replace('!important', '', $template->html())
     );
-    return $DOM->__toString();
+    $template = apply_filters(
+      'mailpoet_rendering_post_process',
+      $DOM->__toString()
+    );
+    return $template;
   }
 }

lib/Statistics/Track/Clicks.php

@@ -9,7 +9,7 @@ use MailPoet\Util\Helpers;
 
 if(!defined('ABSPATH')) exit;
 
-class Clicks {
+class Click {
   public $url;
 
   function __construct($url) {

lib/Statistics/Track/Opens.php

@@ -0,0 +1,64 @@
+<?php
+namespace MailPoet\Statistics\Track;
+
+use MailPoet\Models\NewsletterLink;
+use MailPoet\Models\StatisticsClicks;
+use MailPoet\Models\Subscriber;
+use MailPoet\Subscription\Url as SubscriptionUrl;
+use MailPoet\Util\Helpers;
+
+if(!defined('ABSPATH')) exit;
+
+class Opens {
+  public $url;
+
+  function __construct($url) {
+    $this->url = $url;
+  }
+
+  function track($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);
+    $subscriber = Subscriber::findOne($subscriber_id);
+    if(!$subscriber) return;
+    $statistics = StatisticsOpens::where('link_id', $link->id)
+      ->where('subscriber_id', $subscriber_id)
+      ->where('newsletter_id', $newsletter_id)
+      ->where('queue_id', $queue_id)
+      ->findOne();
+    if(!$statistics) {
+      $statistics = StatisticsClicks::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;
+  }
+
+  private function abort() {
+    header('HTTP/1.0 404 Not Found');
+    exit;
+  }
+}