bug #787 fix day saving transition php (flaugere)

This PR was merged into the 2.x-dev branch.

Discussion
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fix day saving transition php

Bug fix related to https://bugs.php.net/bug.php?id=74274
DateTime format('U') doesn't handle correctly DST. time should be
prefered

Commits
-------

7bb2f70 fix day saving transition php

Signature/LoadedJWS.php

@@ -118,7 +118,7 @@ private function checkExpiration()
             return $this->state = self::INVALID;
         }
 
-        if ($this->clockSkew <= (new \DateTime())->format('U') - $this->payload['exp']) {
+        if ($this->clockSkew <= time() - $this->payload['exp']) {
             $this->state = self::EXPIRED;
         }
     }

Tests/Signature/LoadedJWSTest.php

@@ -4,9 +4,11 @@
 
 use Lexik\Bundle\JWTAuthenticationBundle\Signature\LoadedJWS;
 use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ClockMock;
 
 /**
  * Tests the CreatedJWS model class.
+ * @group time-sensitive
  */
 final class LoadedJWSTest extends TestCase
 {
@@ -96,4 +98,22 @@ public function testIsInvalidReturnsFalseWithIssuedAtSetInTheFutureButAccountedF
         $this->assertFalse($jws->isExpired());
         $this->assertFalse($jws->isInvalid());
     }
+
+    public function testIsNotExpiredDaySavingTransition()
+    {
+        // 2020-10-25 00:16:13 UTC+0
+        $timestamp = 1603584973;
+        ClockMock::withClockMock($timestamp);
+
+        $dstPayload = [
+            'username' => 'test',
+            'exp'      => $timestamp + 3600,
+            'iat'      => $timestamp,
+        ];
+
+        $jws = new LoadedJWS($dstPayload, true);
+
+        $this->assertFalse($jws->isExpired());
+        $this->assertTrue($jws->isVerified());
+    }
 }