Add service for cookies handling & encode them with JSON

[PREMIUM-121]

lib/Util/Cookies.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace MailPoet\Util;
+
+use InvalidArgumentException;
+
+class Cookies {
+  const DEFAULT_OPTIONS = [
+    'expires' => 0,
+    'path' => '',
+    'domain' => '',
+    'secure' => false,
+    'httponly' => false,
+  ];
+
+  function set($name, $value, array $options = []) {
+    $options = $options + self::DEFAULT_OPTIONS;
+    $value = json_encode($value, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+    $error = json_last_error();
+    if ($error) {
+      throw new InvalidArgumentException();
+    }
+
+    // on PHP_VERSION_ID >= 70300 we'll be able to simply setcookie($name, $value, $options);
+    setcookie(
+      $name,
+      $value,
+      $options['expires'],
+      $options['path'],
+      $options['domain'],
+      $options['secure'],
+      $options['httponly']
+    );
+  }
+
+  function get($name) {
+    if (!array_key_exists($name, $_COOKIE)) {
+      return null;
+    }
+    $value = json_decode(stripslashes($_COOKIE[$name]), true);
+    $error = json_last_error();
+    if ($error) {
+      return null;
+    }
+    return $value;
+  }
+}