Form Widget

- added public js code to handle validation and ajax submit
- added widget initializer
- added form widget
- added acceptance test for adding the widget

lib/Config/Widget.php

@@ -0,0 +1,60 @@
+<?php
+namespace MailPoet\Config;
+
+if(!defined('ABSPATH')) exit;
+
+class Widget {
+  function __construct() {
+  }
+
+  function init() {
+    add_action('widgets_init', array($this, 'registerWidget'));
+    add_action('widgets_init', array($this, 'setupActions'));
+    add_action('widgets_init', array($this, 'setupDependencies'));
+  }
+
+  function registerWidget() {
+    register_widget('\MailPoet\Form\Widget');
+  }
+
+  function setupDependencies() {
+    wp_enqueue_script('mailpoet_vendor',
+      Env::$assets_url.'/js/vendor.js',
+      array(),
+      Env::$version,
+      true
+    );
+
+    wp_enqueue_script('mailpoet_public',
+      Env::$assets_url.'/js/public.js',
+      array(),
+      Env::$version,
+      true
+    );
+  }
+
+  function setupActions() {
+    // ajax requests
+    add_action(
+      'wp_ajax_mailpoet_form_subscribe',
+      'mailpoet_form_subscribe'
+    );
+    add_action(
+      'wp_ajax_nopriv_mailpoet_form_subscribe',
+      'mailpoet_form_subscribe'
+    );
+    // post request
+    add_action(
+      'admin_post_nopriv_mailpoet_form_subscribe',
+      'mailpoet_form_subscribe'
+    );
+    add_action(
+      'admin_post_mailpoet_form_subscribe',
+      'mailpoet_form_subscribe'
+    );
+    /*add_action(
+      'init',
+      'mailpoet_form_subscribe'
+    );*/
+  }
+}