public function testCacheControlHeader()
{
$bag = new ResponseHeaderBag(array(), 'response');
$this->assertEquals('no-cache', $bag->get('Cache-Control'));
$this->assertTrue($bag->hasCacheControlDirective('no-cache'));
$bag = new ResponseHeaderBag(array('Cache-Control' => 'public'), 'response');
$this->assertEquals('public', $bag->get('Cache-Control'));
$this->assertTrue($bag->hasCacheControlDirective('public'));
$bag = new ResponseHeaderBag(array('ETag' => 'abcde'), 'response');
$this->assertEquals('private, max-age=0, must-revalidate', $bag->get('Cache-Control'));
$this->assertTrue($bag->hasCacheControlDirective('private'));
$this->assertTrue($bag->hasCacheControlDirective('must-revalidate'));
$this->assertEquals(0, $bag->getCacheControlDirective('max-age'));
$bag = new ResponseHeaderBag(array('Last-Modified' => 'abcde'), 'response');
$this->assertEquals('private, max-age=0, must-revalidate', $bag->get('Cache-Control'));
$bag = new ResponseHeaderBag(array('Etag' => 'abcde', 'Last-Modified' => 'abcde'), 'response');
$this->assertEquals('private, max-age=0, must-revalidate', $bag->get('Cache-Control'));
$bag = new ResponseHeaderBag(array('cache-control' => 'max-age=100'), 'response');
$this->assertEquals('max-age=100, private', $bag->get('Cache-Control'));
$bag = new ResponseHeaderBag(array('cache-control' => 's-maxage=100'), 'response');
$this->assertEquals('s-maxage=100', $bag->get('Cache-Control'));
$bag = new ResponseHeaderBag(array('cache-control' => 'private, max-age=100'), 'response');
$this->assertEquals('max-age=100, private', $bag->get('Cache-Control'));
$bag = new ResponseHeaderBag(array('cache-control' => 'public, max-age=100'), 'response');
$this->assertEquals('max-age=100, public', $bag->get('Cache-Control'));
}
/**
* Returns the number of seconds after the time specified in the response's Date
* header when the response should no longer be considered fresh.
*
* First, it checks for a s-maxage directive, then a max-age directive, and then it falls
* back on an expires header. It returns null when no maximum age can be established.
*
* @return int|null Number of seconds
*
* @api
*/
public function getMaxAge()
{
if ($this->headers->hasCacheControlDirective('s-maxage')) {
return (int) $this->headers->getCacheControlDirective('s-maxage');
}
if ($this->headers->hasCacheControlDirective('max-age')) {
return (int) $this->headers->getCacheControlDirective('max-age');
}
if (null !== $this->getExpires()) {
return $this->getExpires()->format('U') - $this->getDate()->format('U');
}
}
