function ImageStylesPathAndUrlTestCase::_testImageStyleUrlAndPath

Test image_style_url().

File

drupal/modules/image/image.test, line 223

Tests for image.module.

Class

ImageStylesPathAndUrlTestCase

Tests the functions for generating paths and URLs for image styles.

Code

function _testImageStyleUrlAndPath($scheme, $clean_url = TRUE, $extra_slash = FALSE) {

  // Make the default scheme neither "public" nor "private" to verify the
  // functions work for other than the default scheme.
  variable_set('file_default_scheme', 'temporary');
  variable_set('clean_url', $clean_url);

  // 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().
  variable_set('image_module_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);

  // 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, $modified_uri);
  }
  if (!$clean_url) {
    $this
      ->assertTrue(strpos($generate_url, '?q=') !== FALSE, 'When using non-clean URLS, the system path contains the query string.');
  }

  // 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 with 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 with a missing token.');

  // Check that the generated URL is the same when we pass in a relative path
  // rather than a URI. We need to temporarily switch the default scheme to
  // match the desired scheme before testing this, then switch it back to the
  // "temporary" scheme used throughout this test afterwards.
  variable_set('file_default_scheme', $scheme);
  $relative_path = file_uri_target($original_uri);
  $generate_url_from_relative_path = image_style_url($this->style_name, $relative_path);
  $this
    ->assertEqual($generate_url, $generate_url_from_relative_path, 'Generated URL is the same regardless of whether it came from a relative path or a file URI.');
  variable_set('file_default_scheme', 'temporary');

  // 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.');
    $this
      ->assertEqual($this
      ->drupalGetHeader('Cache-Control'), 'no-cache, must-revalidate', 'Cache-Control header was set 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.
    variable_del('image_module_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 with an invalid token.');
  }

  // Allow insecure image derivatives to be created for the remainder of this
  // test.
  variable_set('image_allow_insecure_derivatives', TRUE);

  // 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().
  variable_set('image_module_test_file_download', $original_uri);

  // 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);

  // Check that the image is accessible even without the security token.
  $this
    ->drupalGet(str_replace(IMAGE_DERIVATIVE_TOKEN . '=', 'wrongparam=', $generate_url));
  $this
    ->assertResponse(200, 'Image was accessible at the URL with a missing token.');

  // Check that a security token is still required when generating a second
  // image derivative using the first one as a source.
  $nested_uri = image_style_path($this->style_name, $generated_uri);
  $nested_url = image_style_url($this->style_name, $generated_uri);
  $nested_url_with_wrong_token = str_replace(IMAGE_DERIVATIVE_TOKEN . '=', 'wrongparam=', $nested_url);
  $this
    ->drupalGet($nested_url_with_wrong_token);
  $this
    ->assertResponse(403, 'Image generated from an earlier derivative was inaccessible at the URL with a missing token.');

  // Check that this restriction cannot be bypassed by adding extra slashes
  // to the URL.
  $this
    ->drupalGet(substr_replace($nested_url_with_wrong_token, '//styles/', strrpos($nested_url_with_wrong_token, '/styles/'), strlen('/styles/')));
  $this
    ->assertResponse(403, 'Image generated from an earlier derivative was inaccessible at the URL with a missing token, even with an extra forward slash in the URL.');
  $this
    ->drupalGet(substr_replace($nested_url_with_wrong_token, '/\\styles/', strrpos($nested_url_with_wrong_token, '/styles/'), strlen('/styles/')));
  $this
    ->assertResponse(403, 'Image generated from an earlier derivative was inaccessible at the URL with a missing token, even with an extra backslash in the URL.');

  // Make sure the image can still be generated if a correct token is used.
  $this
    ->drupalGet($nested_url);
  $this
    ->assertResponse(200, 'Image was accessible when a correct token was provided in the URL.');

  // Suppress the security token in the URL, then get the URL of a file. Check
  // that the security token is not present in the URL but that the image is
  // still accessible.
  variable_set('image_suppress_itok_output', TRUE);
  $generate_url = image_style_url($this->style_name, $original_uri);
  $this
    ->assertIdentical(strpos($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.');

  // Check that requesting a nonexistent image does not create any new
  // directories in the file system.
  $directory = $scheme . '://styles/' . $this->style_name . '/' . $scheme . '/' . $this
    ->randomName();
  $this
    ->drupalGet(file_create_url($directory . '/' . $this
    ->randomName()));
  $this
    ->assertFalse(file_exists($directory), 'New directory was not created in the filesystem when requesting an unauthorized image.');
}