implement follow feature

src/application/controller/api/follow/add.php

@@ -0,0 +1,27 @@
+<?php
+
+$response = [
+  'success' => false,
+  'message' => _('Internal server error'),
+];
+
+if (isset($_SESSION['userName']) && isset($_POST['userName'])) {
+
+  $result = $_twister->follow($_SESSION['userName'], [$_POST['userName']]);
+
+  $response = [
+    'success' => true,
+    'message' => _('Followed successfully'),
+  ];
+
+} else {
+
+  $response = [
+    'success' => false,
+    'message' => _('Session expired. Please, reload the page.'),
+  ];
+
+}
+
+header('Content-Type: application/json; charset=utf-8');
+echo json_encode($response);

src/application/controller/api/follow/delete.php

@@ -5,9 +5,7 @@ $response = [
   'message' => _('Internal server error'),
 ];
 
-if (isset($_SESSION['userName'])) {
-
-  $userName = isset($_POST['userName']) ? $_POST['userName'] : false;
+if (isset($_SESSION['userName']) && isset($_POST['userName'])) {
 
   $result = $_twister->unFollow($_SESSION['userName'], [$_POST['userName']]);
 

src/bootstrap.php

@@ -79,6 +79,9 @@ if (isset($_GET['_route_'])) {
       case 'api/follow/get':
         require(PROJECT_DIR . '/application/controller/api/follow/get.php');
       break;
+      case 'api/follow/add':
+        require(PROJECT_DIR . '/application/controller/api/follow/add.php');
+      break;
       case 'api/follow/delete':
         require(PROJECT_DIR . '/application/controller/api/follow/delete.php');
       break;