Added API/Endpoint abstract class

- (re)Added Endpoints folder to both API and Router
- fixed syntax in namespaces
- xhr.responseJSON is returned to the fail()
- fixed Router endpoints (view in browser, cron,...)

lib/API/Endpoints/AutomatedLatestContent.php

@@ -0,0 +1,64 @@
+<?php
+namespace MailPoet\API\Endpoints;
+
+if(!defined('ABSPATH')) exit;
+
+class AutomatedLatestContent {
+  public $ALC;
+
+  function __construct() {
+    $this->ALC = new \MailPoet\Newsletter\AutomatedLatestContent();
+  }
+
+  function getPostTypes() {
+    return get_post_types(array(), 'objects');
+  }
+
+  function getTaxonomies($args) {
+    $post_type = (isset($args['postType'])) ? $args['postType'] : 'post';
+    return get_object_taxonomies($post_type, 'objects');
+  }
+
+  function getTerms($args) {
+    $taxonomies = (isset($args['taxonomies'])) ? $args['taxonomies'] : array();
+    $search = (isset($args['search'])) ? $args['search'] : '';
+    $limit = (isset($args['limit'])) ? (int)$args['limit'] : 10;
+    $page = (isset($args['page'])) ? (int)$args['page'] : 1;
+    return get_terms(
+      $taxonomies,
+      array(
+        'hide_empty' => false,
+        'search' => $search,
+        'number' => $limit,
+        'offset' => $limit * ($page - 1)
+      )
+    );
+  }
+
+  function getPosts($args) {
+    return $this->ALC->getPosts($args);
+  }
+
+  function getTransformedPosts($args) {
+    $posts = $this->ALC->getPosts($args);
+    return $this->ALC->transformPosts($args, $posts);
+  }
+
+  function getBulkTransformedPosts($args) {
+    $alc = new \MailPoet\Newsletter\AutomatedLatestContent();
+
+    $used_posts = array();
+    $rendered_posts = array();
+
+    foreach($args['blocks'] as $block) {
+      $posts = $alc->getPosts($block, $used_posts);
+      $rendered_posts[] = $alc->transformPosts($block, $posts);
+
+      foreach($posts as $post) {
+        $used_posts[] = $post->ID;
+      }
+    }
+
+    return $rendered_posts;
+  }
+}