Updated serialzation strategy

Author: kamermans

src/Persistence/FileTokenPersistence.php

@@ -27,7 +27,7 @@ public function restoreToken(TokenInterface $token)
             return null;
         }
 
-        $data = json_decode(file_get_contents($this->filepath), true);
+        $data = @json_decode(file_get_contents($this->filepath), true);
 
         if (false === $data) {
             return null;
@@ -39,7 +39,7 @@ public function restoreToken(TokenInterface $token)
     public function deleteToken()
     {
         if (file_exists($this->filepath)) {
-            unlink($this->filepath);
+            @unlink($this->filepath);
         }
     }
 }

src/Token/RawToken.php

@@ -2,7 +2,7 @@
 
 namespace kamermans\OAuth2\Token;
 
-class RawToken implements \Serializable, TokenInterface
+class RawToken implements Serializable, TokenInterface
 {
     // Pull in serialize() and unserialize() methods
     use TokenSerializer;

src/Token/Serializable.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace kamermans\OAuth2\Token;
+
+interface Serializable
+{
+    /**
+     * Serialize object.
+     *
+     * @return array
+     */
+    public function serialize();
+    /**
+     * Unserialize object.
+     *
+     * @param array $data
+     */
+    public function unserialize(array $data);
+}

src/Token/TokenSerializer.php

@@ -31,11 +31,11 @@ trait TokenSerializer
      */
     public function serialize()
     {
-        return serialize([
+        return [
             'access_token'  => $this->accessToken,
             'refresh_token' => $this->refreshToken,
             'expires_at'    => $this->expiresAt,
-        ]);
+        ];
     }
 
     /**
@@ -44,8 +44,7 @@ public function serialize()
      */
     public function unserialize($data)
     {
-        $data = unserialize($data);
-        if (!is_array($data) || !isset($data['access_token'])) {
+        if (!isset($data['access_token'])) {
             throw new \InvalidArgumentException('Unable to create a RawToken without an "access_token"');
         }