class PageCacheTest

class PageCacheTest extends BrowserTestBase {
    use AssertPageCacheContextsAndTagsTrait;
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'test_page_test',
        'system_test',
        'entity_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->config('system.site')
            ->set('name', 'Drupal')
            ->set('page.front', '/test-page')
            ->save();
    }
    
    /**
     * Tests support for different cache items with different request formats.
     *
     * Request formats are specified via a query parameter.
     */
    public function testQueryParameterFormatRequests() {
        $config = $this->config('system.performance');
        $config->set('cache.page.max_age', 300);
        $config->save();
        // Enable REST support for nodes and hal+json.
        \Drupal::service('module_installer')->install([
            'node',
            'hal',
            'rest',
            'basic_auth',
        ]);
        $this->drupalCreateContentType([
            'type' => 'article',
        ]);
        $node = $this->drupalCreateNode([
            'type' => 'article',
        ]);
        $node_uri = $node->toUrl();
        $node_url_with_hal_json_format = $node->toUrl('canonical')
            ->setRouteParameter('_format', 'hal_json');
        $this->drupalGet($node_uri);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'text/html; charset=UTF-8');
        $this->drupalGet($node_uri);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'text/html; charset=UTF-8');
        // Now request a HAL page twice, we expect that the first request is a cache
        // miss and both requests serve 'application/hal+json'.
        $this->drupalGet($node_url_with_hal_json_format);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'application/hal+json');
        $this->drupalGet($node_url_with_hal_json_format);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'application/hal+json');
        // Clear the page cache. After that request a double HAL request, followed
        // by two ordinary HTML ones.
        \Drupal::cache('page')->deleteAll();
        $this->drupalGet($node_url_with_hal_json_format);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'application/hal+json');
        $this->drupalGet($node_url_with_hal_json_format);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'application/hal+json');
        $this->drupalGet($node_uri);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'MISS');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'text/html; charset=UTF-8');
        $this->drupalGet($node_uri);
        $this->assertSession()
            ->responseHeaderEquals('X-Drupal-Cache', 'HIT');
        $this->assertSession()
            ->responseHeaderEquals('Content-Type', 'text/html; charset=UTF-8');
    }
    
    /**
     * Retrieves only the headers for an absolute path.
     *
     * Executes a cURL request without any modifications to the given URL.
     * Note that Guzzle always normalizes URLs which prevents testing all
     * possible edge cases.
     *
     * @param string $url
     *   URL to request.
     *
     * @return array
     *   Array of headers.
     */
    protected function getHeaders($url) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, TRUE);
        curl_setopt($ch, CURLOPT_NOBODY, TRUE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_USERAGENT, drupal_generate_test_ua($this->databasePrefix));
        $output = curl_exec($ch);
        curl_close($ch);
        $headers = [];
        foreach (explode("\n", $output) as $header) {
            if (strpos($header, ':')) {
                [
                    $key,
                    $value,
                ] = explode(':', $header, 2);
                $headers[trim($key)] = trim($value);
            }
        }
        return $headers;
    }

}