ImageStylesPathAndUrlTest.php

<?php

/**
 * @file
 * Definition of Drupal\image\Tests\ImageStylesPathAndUrlTest.
 */
namespace Drupal\image\Tests;

use Drupal\simpletest\WebTestBase;
use Symfony\Component\HttpFoundation\Request;

/**
 * Tests the functions for generating paths and URLs for image styles.
 */
class ImageStylesPathAndUrlTest extends WebTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array(
    'image',
    'image_module_test',
  );
  protected $style_name;
  protected $image_info;
  protected $image_filepath;
  public static function getInfo() {
    return array(
      'name' => 'Image styles path and URL functions',
      'description' => 'Tests functions for generating paths and URLs to image styles.',
      'group' => 'Image',
    );
  }
  function setUp() {
    parent::setUp();
    $this->style_name = 'style_foo';
    $style = entity_create('image_style', array(
      'name' => $this->style_name,
      'label' => $this
        ->randomString(),
    ));
    $style
      ->save();
  }

  /**
   * Test image_style_path().
   */
  function testImageStylePath() {
    $scheme = 'public';
    $actual = image_style_path($this->style_name, "{$scheme}://foo/bar.gif");
    $expected = "{$scheme}://styles/" . $this->style_name . "/{$scheme}/foo/bar.gif";
    $this
      ->assertEqual($actual, $expected, 'Got the path for a file URI.');
    $actual = image_style_path($this->style_name, 'foo/bar.gif');
    $expected = "{$scheme}://styles/" . $this->style_name . "/{$scheme}/foo/bar.gif";
    $this
      ->assertEqual($actual, $expected, 'Got the path for a relative file path.');
  }

  /**
   * Test image_style_url() with a file using the "public://" scheme.
   */
  function testImageStyleUrlAndPathPublic() {
    $this
      ->_testImageStyleUrlAndPath('public');
  }

  /**
   * Test image_style_url() with a file using the "private://" scheme.
   */
  function testImageStyleUrlAndPathPrivate() {
    $this
      ->_testImageStyleUrlAndPath('private');
  }

  /**
   * Test image_style_url() with the "public://" scheme and unclean URLs.
   */
  function testImageStylUrlAndPathPublicUnclean() {
    $this
      ->_testImageStyleUrlAndPath('public', FALSE);
  }

  /**
   * Test image_style_url() with the "private://" schema and unclean URLs.
   */
  function testImageStyleUrlAndPathPrivateUnclean() {
    $this
      ->_testImageStyleUrlAndPath('private', FALSE);
  }

  /**
   * Tests image_style_url() with a file URL that has an extra slash in it.
   */
  function testImageStyleUrlExtraSlash() {
    $this
      ->_testImageStyleUrlAndPath('public', TRUE, TRUE);
  }

  /**
   * Tests that an invalid source image returns a 404.
   */
  function testImageStyleUrlForMissingSourceImage() {
    $non_existent_uri = 'public://foo.png';
    $generated_url = image_style_url($this->style_name, $non_existent_uri);
    $this
      ->drupalGet($generated_url);
    $this
      ->assertResponse(404, 'Accessing an image style URL with a source image that does not exist provides a 404 error response.');
  }

  /**
   * Tests image_style_url().
   */
  function _testImageStyleUrlAndPath($scheme, $clean_url = TRUE, $extra_slash = FALSE) {
    $request = $this
      ->prepareRequestForGenerator($clean_url);

    // Make the default scheme neither "public" nor "private" to verify the
    // functions work for other than the default scheme.
    config('system.file')
      ->set('default_scheme', 'temporary')
      ->save();

    // Create the directories for the styles.
    $directory = $scheme . '://styles/' . $this->style_name;
    $status = file_prepare_directory($directory, FILE_CREATE_DIRECTORY);
    $this
      ->assertNotIdentical(FALSE, $status, 'Created the directory for the generated images for the test style.');

    // Create a working copy of the file.
    $files = $this
      ->drupalGetTestFiles('image');
    $file = array_shift($files);
    $image_info = image_get_info($file->uri);
    $original_uri = file_unmanaged_copy($file->uri, $scheme . '://', FILE_EXISTS_RENAME);

    // Let the image_module_test module know about this file, so it can claim
    // ownership in hook_file_download().
    \Drupal::state()
      ->set('image.test_file_download', $original_uri);
    $this
      ->assertNotIdentical(FALSE, $original_uri, 'Created the generated image file.');

    // Get the URL of a file that has not been generated and try to create it.
    $generated_uri = image_style_path($this->style_name, $original_uri);
    $this
      ->assertFalse(file_exists($generated_uri), 'Generated file does not exist.');
    $generate_url = image_style_url($this->style_name, $original_uri, $clean_url);

    // Ensure that the tests still pass when the file is generated by accessing
    // a poorly constructed (but still valid) file URL that has an extra slash
    // in it.
    if ($extra_slash) {
      $modified_uri = str_replace('://', ':///', $original_uri);
      $this
        ->assertNotEqual($original_uri, $modified_uri, 'An extra slash was added to the generated file URI.');
      $generate_url = image_style_url($this->style_name, $modified_uri, $clean_url);
    }
    if (!$clean_url) {
      $this
        ->assertTrue(strpos($generate_url, 'index.php/') !== FALSE, 'When using non-clean URLS, the system path contains the script name.');
    }

    // Add some extra chars to the token.
    $this
      ->drupalGet(str_replace(IMAGE_DERIVATIVE_TOKEN . '=', IMAGE_DERIVATIVE_TOKEN . '=Zo', $generate_url));
    $this
      ->assertResponse(403, 'Image was inaccessible at the URL wih an invalid token.');

    // Change the parameter name so the token is missing.
    $this
      ->drupalGet(str_replace(IMAGE_DERIVATIVE_TOKEN . '=', 'wrongparam=', $generate_url));
    $this
      ->assertResponse(403, 'Image was inaccessible at the URL wih a missing token.');

    // Fetch the URL that generates the file.
    $this
      ->drupalGet($generate_url);
    $this
      ->assertResponse(200, 'Image was generated at the URL.');
    $this
      ->assertTrue(file_exists($generated_uri), 'Generated file does exist after we accessed it.');
    $this
      ->assertRaw(file_get_contents($generated_uri), 'URL returns expected file.');
    $generated_image_info = image_get_info($generated_uri);
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Type'), $generated_image_info['mime_type'], 'Expected Content-Type was reported.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Content-Length'), $generated_image_info['file_size'], 'Expected Content-Length was reported.');
    if ($scheme == 'private') {
      $this
        ->assertEqual($this
        ->drupalGetHeader('Expires'), 'Sun, 19 Nov 1978 05:00:00 GMT', 'Expires header was sent.');
      $this
        ->assertNotEqual(strpos($this
        ->drupalGetHeader('Cache-Control'), 'no-cache'), FALSE, 'Cache-Control header contains \'no-cache\' to prevent caching.');
      $this
        ->assertEqual($this
        ->drupalGetHeader('X-Image-Owned-By'), 'image_module_test', 'Expected custom header has been added.');

      // Make sure that a second request to the already existing derivate works
      // too.
      $this
        ->drupalGet($generate_url);
      $this
        ->assertResponse(200, 'Image was generated at the URL.');

      // Make sure that access is denied for existing style files if we do not
      // have access.
      \Drupal::state()
        ->delete('image.test_file_download');
      $this
        ->drupalGet($generate_url);
      $this
        ->assertResponse(403, 'Confirmed that access is denied for the private image style.');

      // Repeat this with a different file that we do not have access to and
      // make sure that access is denied.
      $file_noaccess = array_shift($files);
      $original_uri_noaccess = file_unmanaged_copy($file_noaccess->uri, $scheme . '://', FILE_EXISTS_RENAME);
      $generated_uri_noaccess = $scheme . '://styles/' . $this->style_name . '/' . $scheme . '/' . drupal_basename($original_uri_noaccess);
      $this
        ->assertFalse(file_exists($generated_uri_noaccess), 'Generated file does not exist.');
      $generate_url_noaccess = image_style_url($this->style_name, $original_uri_noaccess);
      $this
        ->drupalGet($generate_url_noaccess);
      $this
        ->assertResponse(403, 'Confirmed that access is denied for the private image style.');

      // Verify that images are not appended to the response. Currently this test only uses PNG images.
      if (strpos($generate_url, '.png') === FALSE) {
        $this
          ->fail('Confirming that private image styles are not appended require PNG file.');
      }
      else {

        // Check for PNG-Signature (cf. http://www.libpng.org/pub/png/book/chapter08.html#png.ch08.div.2) in the
        // response body.
        $this
          ->assertNoRaw(chr(137) . chr(80) . chr(78) . chr(71) . chr(13) . chr(10) . chr(26) . chr(10), 'No PNG signature found in the response body.');
      }
    }
    elseif ($clean_url) {

      // Add some extra chars to the token.
      $this
        ->drupalGet(str_replace(IMAGE_DERIVATIVE_TOKEN . '=', IMAGE_DERIVATIVE_TOKEN . '=Zo', $generate_url));
      $this
        ->assertResponse(200, 'Existing image was accessible at the URL wih an invalid token.');
    }

    // Allow insecure image derivatives to be created for the remainder of this
    // test.
    config('image.settings')
      ->set('allow_insecure_derivatives', TRUE)
      ->save();

    // Create another working copy of the file.
    $files = $this
      ->drupalGetTestFiles('image');
    $file = array_shift($files);
    $image_info = image_get_info($file->uri);
    $original_uri = file_unmanaged_copy($file->uri, $scheme . '://', FILE_EXISTS_RENAME);

    // Let the image_module_test module know about this file, so it can claim
    // ownership in hook_file_download().
    \Drupal::state()
      ->set('image.test_file_download', $original_uri);

    // Suppress the security token in the URL, then get the URL of a file that
    // has not been created and try to create it. Check that the security token
    // is not present in the URL but that the image is still accessible.
    config('image.settings')
      ->set('suppress_itok_output', TRUE)
      ->save();
    $generated_uri = image_style_path($this->style_name, $original_uri);
    $this
      ->assertFalse(file_exists($generated_uri), 'Generated file does not exist.');
    $generate_url = image_style_url($this->style_name, $original_uri, $clean_url);
    $this
      ->assertIdentical(strpos($generate_url, IMAGE_DERIVATIVE_TOKEN . '='), FALSE, 'The security token does not appear in the image style URL.');
    $this
      ->drupalGet($generate_url);
    $this
      ->assertResponse(200, 'Image was accessible at the URL with a missing token.');
  }

}