Moved lib/API to lib/Router

- renamed lib/API/API.php to lib/Router/Front.php
- updated namespaces in various file to account for namespace change

lib/API/API.php

@@ -1,90 +0,0 @@
-<?php
-namespace MailPoet\API;
-
-use MailPoet\Util\Helpers;
-
-if(!defined('ABSPATH')) exit;
-
-class API {
-  public $api_request;
-  public $endpoint;
-  public $action;
-  public $data;
-  const NAME = 'mailpoet_api';
-  const ENDPOINT_NAMESPACE = '\MailPoet\API\Endpoints\\';
-  const RESPONSE_ERROR = 404;
-
-  function __construct($api_data = false) {
-    $api_data = ($api_data) ? $api_data : $_GET;
-    $this->api_request = isset($api_data[self::NAME]);
-    $this->endpoint = isset($api_data['endpoint']) ?
-      Helpers::underscoreToCamelCase($api_data['endpoint']) :
-      false;
-    $this->action = isset($api_data['action']) ?
-      Helpers::underscoreToCamelCase($api_data['action']) :
-      false;
-    $this->data = isset($api_data['data']) ?
-      self::decodeRequestData($api_data['data']) :
-      false;
-  }
-
-  function init() {
-    $endpoint = self::ENDPOINT_NAMESPACE . ucfirst($this->endpoint);
-    if(!$this->api_request) return;
-    if(!$this->endpoint || !class_exists($endpoint)) {
-      self::terminateRequest(self::RESPONSE_ERROR, __('Invalid API endpoint.'));
-    }
-    $this->callEndpoint(
-      $endpoint,
-      $this->action,
-      $this->data
-    );
-  }
-
-  function callEndpoint($endpoint, $action, $data) {
-    if(!method_exists($endpoint, $action)) {
-      self::terminateRequest(self::RESPONSE_ERROR, __('Invalid API action.'));
-    }
-    call_user_func(
-      array(
-        $endpoint,
-        $action
-      ),
-      $data
-    );
-  }
-
-  static function decodeRequestData($data) {
-    $data = base64_decode($data);
-
-    if(is_serialized($data)) {
-      $data = unserialize($data);
-    }
-
-    if(!is_array($data)) {
-      $data = array();
-    }
-
-    return $data;
-  }
-
-  static function encodeRequestData($data) {
-    return rtrim(base64_encode(serialize($data)), '=');
-  }
-
-  static function buildRequest($endpoint, $action, $data) {
-    $data = self::encodeRequestData($data);
-    $params = array(
-      self::NAME => '',
-      'endpoint' => $endpoint,
-      'action' => $action,
-      'data' => $data
-    );
-    return add_query_arg($params, home_url());
-  }
-
-  static function terminateRequest($code, $message) {
-    status_header($code, $message);
-    exit;
-  }
-}