properly handle custom subscriptions pages

lib/Models/SendingQueue.php

@@ -35,8 +35,4 @@ class SendingQueue extends Model {
     $this->save();
     return ($this->getErrors() === false && $this->id() > 0);
   }
-
-  function stop() {
-    return $this->delete();
-  }
 }

lib/Settings/Pages.php

@@ -33,7 +33,7 @@ class Pages {
       'post_type' => 'mailpoet_page',
       'post_author' => 1,
       'post_content' => '[mailpoet_page]',
-      'post_title' => __('MailPoet Page'),
+      'post_title' => '[mailpoet_title]',
       'post_name' => 'subscriptions'
     ));
     flush_rewrite_rules();
@@ -66,7 +66,7 @@ class Pages {
       'id' => $page->ID,
       'title' => $page->post_title,
       'preview_url' => add_query_arg(array(
-        'preview' => 1
+        'mailpoet_preview' => 1
       ), get_permalink($page->ID))
     );
   }

lib/Subscription/Pages.php

@@ -17,10 +17,11 @@ class Pages {
   }
 
   function init() {
-    if(isset($_GET['mailpoet_page'])) {
-      add_filter('wp_title', array($this,'setWindowTitle'));
-      add_filter('the_title', array($this,'setPageTitle'));
-      add_filter('the_content', array($this,'setPageContent'));
+    $action = $this->getAction();
+    if($action !== null) {
+      add_filter('document_title_parts', array($this,'setWindowTitle'), 10, 1);
+      add_filter('the_title', array($this,'setPageTitle'), 10, 1);
+      add_filter('the_content', array($this,'setPageContent'), 10, 1);
     }
     add_action(
       'admin_post_mailpoet_subscriber_save',
@@ -43,25 +44,35 @@ class Pages {
       $_POST,
       array_flip($reserved_keywords)
     );
+    if(isset($subscriber_data['email'])) {
+      if($subscriber_data['email'] !== self::DEMO_EMAIL) {
         $subscriber = Subscriber::createOrUpdate($subscriber_data);
         $errors = $subscriber->getErrors();
-
+      }
+    }
     // TBD: success/error messages (not present in MP2)
 
     Url::redirectBack();
   }
 
   function isPreview() {
-    return (array_key_exists('preview', $_GET));
+    return (array_key_exists('mailpoet_preview', $_GET));
   }
 
-  function setWindowTitle() {
-    // TODO
+  function setWindowTitle($meta = array()) {
+    $meta['title'] = $this->setPageTitle($meta['title']);
+    return $meta;
   }
 
-  function setPageTitle($title = null) {
+  function setPageTitle($page_title = '[mailpoet_title]') {
+   if(
+      (strpos($page_title, '[mailpoet_title]') === false)
+      &&
+      (strlen(trim($page_title)) > 0)
+    ) {
+      return $page_title;
+    } else {
       $subscriber = $this->getSubscriber();
-
       switch($this->getAction()) {
         case 'confirm':
           return $this->getConfirmTitle($subscriber);
@@ -81,7 +92,8 @@ class Pages {
           return $this->getUnsubscribeTitle($subscriber);
         break;
       }
-    return $title;
+    }
+    return str_replace('[mailpoet_title]', $title, $page_title);
   }
 
   function setPageContent($page_content = '[mailpoet_page]') {

lib/Subscription/Url.php

@@ -41,7 +41,7 @@ class Url {
     } else {
       $params = array(
         'mailpoet_action='.$action,
-        'preview'
+        'mailpoet_preview=1'
       );
     }
     // add parameters