Added support for cookie Max-Age.

src/Http/Cookie/CookieCollection.php

@@ -338,7 +338,8 @@ class CookieCollection implements IteratorAggregate, Countable
                 'domain' => '',
                 'secure' => false,
                 'httponly' => false,
-                'expires' => null
+                'expires' => null,
+                'max-age' => null
             ];
             foreach ($parts as $i => $part) {
                 if (strpos($part, '=') !== false) {
@@ -358,7 +359,9 @@ class CookieCollection implements IteratorAggregate, Countable
                 }
             }
             $expires = null;
-            if ($cookie['expires']) {
+            if ($cookie['max-age'] !== null) {
+                $expires = new DateTimeImmutable('@' . (time() + $cookie['max-age']));
+            } elseif ($cookie['expires']) {
                 $expires = new DateTimeImmutable('@' . strtotime($cookie['expires']));
             }
 

tests/TestCase/Http/Cookie/CookieCollectionTest.php

@@ -208,7 +208,8 @@ class CookieCollectionTest extends TestCase
         $response = (new Response())
             ->withAddedHeader('Set-Cookie', 'test=value')
             ->withAddedHeader('Set-Cookie', 'expiring=soon; Expires=Wed, 09-Jun-2021 10:18:14 GMT; Path=/; HttpOnly; Secure;')
-            ->withAddedHeader('Set-Cookie', 'session=123abc; Domain=www.example.com');
+            ->withAddedHeader('Set-Cookie', 'session=123abc; Domain=www.example.com')
+            ->withAddedHeader('Set-Cookie', 'maxage=value; Max-Age=60; Expires=Wed, 09-Jun-2021 10:18:14 GMT;');
         $new = $collection->addFromResponse($response, $request);
         $this->assertNotSame($new, $collection, 'Should clone collection');
 
@@ -218,6 +219,7 @@ class CookieCollectionTest extends TestCase
         $this->assertSame('value', $new->get('test')->getValue());
         $this->assertSame('123abc', $new->get('session')->getValue());
         $this->assertSame('soon', $new->get('expiring')->getValue());
+        $this->assertSame('value', $new->get('maxage')->getValue());
 
         $this->assertSame('/app', $new->get('test')->getPath(), 'cookies should inherit request path');
         $this->assertSame('/', $new->get('expiring')->getPath(), 'path attribute should be used.');
@@ -231,6 +233,13 @@ class CookieCollectionTest extends TestCase
         $session = $new->get('session');
         $this->assertNull($session->getExpiry(), 'No expiry');
         $this->assertSame('www.example.com', $session->getDomain(), 'Has domain');
+
+        $maxage = $new->get('maxage');
+        $this->assertLessThanOrEqual(
+            (new DateTime('60 seconds'))->format('Y-m-d H:i:s'),
+            $maxage->getExpiry()->format('Y-m-d H:i:s'),
+            'Has max age'
+        );
     }
 
     /**