- Adds and centralizes API data encoding/decoding method

lib/API/API.php

@@ -22,7 +22,7 @@ class API {
     $this->action = isset($_GET['action']) ?
       Helpers::underscoreToCamelCase($_GET['action']) :
       false;
-    $this->data = $this->validateRequestData();
+    $this->data = self::decodeRequestData($_GET['data']);
   }
 
   function init() {
@@ -46,15 +46,22 @@ class API {
     );
   }
 
-  function validateRequestData() {
+  static function decodeRequestData($data) {
-    if(!isset($_GET['data'])) return false;
+    if(!$data) return false;
-    $data = base64_decode($_GET['data']);
+    $data = base64_decode($data);
     return (is_serialized($data)) ?
       unserialize($data) :
-      $this->terminateRequest(404, __('Invalid API data format.'));
+      self::terminateRequest(404, __('Invalid API data format.'));
   }
 
-  static function buildRequest($endpoint, $action, $data) {
+  static function encodeRequestData($data) {
+    return rtrim(base64_encode(serialize($data)), '=');
+  }
+
+  static function buildRequest($endpoint, $action, $data, $encode_data = true) {
+    if($encode_data) {
+      $data = base64_encode(serialize($data));
+    }
     $params = array(
       self::API_NAME => '',
       'endpoint' => $endpoint,

lib/Cron/CronHelper.php

@@ -40,11 +40,11 @@ class CronHelper {
   }
 
   static function accessDaemon($token, $timeout = self::DAEMON_REQUEST_TIMEOUT) {
-    $data = serialize(array('token' => $token));
+    $data = array('token' => $token);
     $url = API::buildRequest(
       QueueAPI::ENDPOINT,
       QueueAPI::ACTION_RUN,
-      base64_encode($data)
+      $data
     );
     $args = array(
       'timeout' => $timeout,

lib/Newsletter/Links/Links.php

@@ -62,10 +62,13 @@ class Links {
         'hash' => $hash,
         'url' => $extracted_link['link']
       );
+      $data = self::DATA_TAG . '-' . $hash;
+      // do not encode data; it's replaced with subscriber-specific data
+      // and encoded during send operation (Links::replaceSubscriberData())
       $tracked_link = API::buildRequest(
         TrackAPI::ENDPOINT,
         TrackAPI::ACTION_CLICK,
-        self::DATA_TAG . '-' . $hash
+        $encode_data = false
       );
       // first, replace URL in the extracted HTML source with encoded link
       $tracked_link_html_source = str_replace(
@@ -111,7 +114,7 @@ class Links {
         'queue' => $queue_id,
         'hash' => $hash
       );
-      $data = rtrim(base64_encode(serialize($data)), '=');
+      $data = API::encodeRequestData($data);
       $content = str_replace($link, $data, $content);
     }
     return $content;

lib/Newsletter/Renderer/PostProcess/OpenTracking.php

@@ -11,10 +11,14 @@ class OpenTracking {
     $DOM = new \pQuery();
     $DOM = $DOM->parseStr($template);
     $template = $DOM->query('body');
+    $data = Links::DATA_TAG;
+    // do not encode data; it's replaced with subscriber-specific data
+    // and encoded during send operation (Links::replaceSubscriberData())
     $url = API::buildRequest(
       TrackAPI::ENDPOINT,
       TrackAPI::ACTION_OPEN,
-      Links::DATA_TAG
+      $data,
+      $encode_data = false
     );
     $open_tracking_image = sprintf(
       '<img alt="" class="" src="%s"/>',
@@ -25,9 +29,9 @@ class OpenTracking {
   }
 
   static function addTrackingImage() {
-    add_filter(Renderer::POST_PROCESS_FILTER, function ($template) {
+    add_filter(Renderer::POST_PROCESS_FILTER, function($template) {
       return OpenTracking::process($template);
     });
     return true;
   }
-}
+}

lib/Newsletter/Url.php

@@ -2,7 +2,7 @@
 namespace MailPoet\Newsletter;
 
 use MailPoet\API\API;
-use MailPoet\API\Endpoints\ViewInBrowser;
+use MailPoet\API\Endpoints\ViewInBrowser as ViewInBrowserAPI;
 use MailPoet\Models\Subscriber;
 
 class Url {
@@ -36,9 +36,9 @@ class Url {
     );
     $params = array(
       API::API_NAME,
-      'endpoint' => ViewInBrowser::ENDPOINT,
+      ViewInBrowserAPI::ENDPOINT,
-      'action' => ViewInBrowser::ACTION_VIEW,
+      ViewInBrowserAPI::ACTION_VIEW,
-      'data' => base64_encode(serialize($data))
+      $data
     );
     return add_query_arg($params, home_url());
   }

lib/Subscription/Url.php

@@ -49,7 +49,7 @@ class Url {
       API::API_NAME,
       'endpoint='.Subscription::ENDPOINT,
       'action='.$action,
-      'data='.rtrim(base64_encode(serialize($data)), '=')
+      'data='. API::encodeRequestData($data)
     );
 
     // add parameters