file.module 61.1 KB
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<?php

/**
 * @file
 * Defines a "managed_file" Form API field and a "file" field for Field module.
 */

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use Drupal\file\Plugin\Core\Entity\File;
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use Drupal\Component\Utility\NestedArray;
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use Drupal\Core\Template\Attribute;
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use Symfony\Component\HttpFoundation\JsonResponse;
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use Drupal\file\FileUsage\DatabaseFileUsageBackend;
use Drupal\file\FileUsage\FileUsageInterface;
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use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\ReplaceCommand;
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// Load all Field module hooks for File.
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require_once __DIR__ . '/file.field.inc';
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/**
 * Implements hook_help().
 */
function file_help($path, $arg) {
  switch ($path) {
    case 'admin/help#file':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
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      $output .= '<p>' . t('The File module defines a <em>File</em> field type for the Field module, which lets you manage and validate uploaded files attached to content on your site (see the <a href="@field-help">Field module help page</a> for more information about fields). For more information, see the online handbook entry for <a href="@file">File module</a>.', array('@field-help' => url('admin/help/field'), '@file' => 'http://drupal.org/documentation/modules/file')) . '</p>';
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      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Attaching files to content') . '</dt>';
      $output .= '<dd>' . t('The File module allows users to attach files to content (e.g., PDF files, spreadsheets, etc.), when a <em>File</em> field is added to a given content type using the <a href="@fieldui-help">Field UI module</a>. You can add validation options to your File field, such as specifying a maximum file size and allowed file extensions.', array('@fieldui-help' => url('admin/help/field_ui'))) . '</dd>';
      $output .= '<dt>' . t('Managing attachment display') . '</dt>';
      $output .= '<dd>' . t('When you attach a file to content, you can specify whether it is <em>listed</em> or not. Listed files are displayed automatically in a section at the bottom of your content; non-listed files are available for embedding in your content, but are not included in the list at the bottom.') . '</dd>';
      $output .= '<dt>' . t('Managing file locations') . '</dt>';
      $output .= '<dd>' . t("When you create a File field, you can specify a directory where the files will be stored, which can be within either the <em>public</em> or <em>private</em> files directory. Files in the public directory can be accessed directly through the web server; when public files are listed, direct links to the files are used, and anyone who knows a file's URL can download the file. Files in the private directory are not accessible directly through the web server; when private files are listed, the links are Drupal path requests. This adds to server load and download time, since Drupal must start up and resolve the path for each file download request, but allows for access restrictions.") . '</dd>';
      $output .= '</dl>';
      return $output;
  }
}

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/**
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 * Implements hook_menu().
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 */
function file_menu() {
  $items = array();

  $items['file/ajax'] = array(
    'page callback' => 'file_ajax_upload',
    'access arguments' => array('access content'),
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    'theme callback' => 'ajax_base_page_theme',
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    'type' => MENU_CALLBACK,
  );
  $items['file/progress'] = array(
    'page callback' => 'file_ajax_progress',
    'access arguments' => array('access content'),
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    'theme callback' => 'ajax_base_page_theme',
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    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
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 * Implements hook_element_info().
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 *
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 * The managed file element may be used anywhere in Drupal.
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 */
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function file_element_info() {
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  $file_path = drupal_get_path('module', 'file');
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  $types['managed_file'] = array(
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    '#input' => TRUE,
    '#process' => array('file_managed_file_process'),
    '#value_callback' => 'file_managed_file_value',
    '#element_validate' => array('file_managed_file_validate'),
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    '#pre_render' => array('file_managed_file_pre_render'),
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    '#theme' => 'file_managed_file',
    '#theme_wrappers' => array('form_element'),
    '#progress_indicator' => 'throbber',
    '#progress_message' => NULL,
    '#upload_validators' => array(),
    '#upload_location' => NULL,
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    '#size' => 22,
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    '#multiple' => FALSE,
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    '#extended' => FALSE,
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    '#attached' => array(
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      'library' => array(array('file','drupal.file')),
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    ),
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  );
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  return $types;
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}

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/**
 * Loads file entities from the database.
 *
 * @param array $fids
 *   (optional) An array of entity IDs. If omitted, all entities are loaded.
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 * @param $reset
 *   Whether to reset the internal file_load_multiple() cache.
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 *
 * @return array
 *   An array of file entities, indexed by fid.
 *
 * @see hook_file_load()
 * @see file_load()
 * @see entity_load()
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 * @see Drupal\Core\Entity\Query\EntityQueryInterface
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 */
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function file_load_multiple(array $fids = NULL, $reset = FALSE) {
  return entity_load_multiple('file', $fids, $reset);
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}

/**
 * Loads a single file entity from the database.
 *
 * @param $fid
 *   A file ID.
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 * @param $reset
 *   Whether to reset the internal file_load_multiple() cache.
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 *
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 * @return \Drupal\file\FileInterface
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 *   A file entity or FALSE if the file was not found.
 *
 * @see hook_file_load()
 * @see file_load_multiple()
 */
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function file_load($fid, $reset = FALSE) {
  $files = file_load_multiple(array($fid), $reset);
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  return reset($files);
}

/**
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 * Returns the file usage service.
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 *
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 * @return Drupal\file\FileUsage\FileUsageInterface.
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 */
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function file_usage() {
  return drupal_container()->get('file.usage');
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}

/**
 * Copies a file to a new location and adds a file record to the database.
 *
 * This function should be used when manipulating files that have records
 * stored in the database. This is a powerful function that in many ways
 * performs like an advanced version of copy().
 * - Checks if $source and $destination are valid and readable/writable.
 * - Checks that $source is not equal to $destination; if they are an error
 *   is reported.
 * - If file already exists in $destination either the call will error out,
 *   replace the file or rename the file based on the $replace parameter.
 * - Adds the new file to the files database. If the source file is a
 *   temporary file, the resulting file will also be a temporary file. See
 *   file_save_upload() for details on temporary files.
 *
 * @param Drupal\file\File $source
 *   A file entity.
 * @param $destination
 *   A string containing the destination that $source should be copied to.
 *   This must be a stream wrapper URI.
 * @param $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
 *       the destination name exists then its database entry will be updated. If
 *       no database entry is found then a new one will be created.
 *   - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
 *       unique.
 *   - FILE_EXISTS_ERROR - Do nothing and return FALSE.
 *
 * @return
 *   File object if the copy is successful, or FALSE in the event of an error.
 *
 * @see file_unmanaged_copy()
 * @see hook_file_copy()
 */
function file_copy(File $source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
  if (!file_valid_uri($destination)) {
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    if (($realpath = drupal_realpath($source->getFileUri())) !== FALSE) {
      watchdog('file', 'File %file (%realpath) could not be copied because the destination %destination is invalid. This is often caused by improper use of file_copy() or a missing stream wrapper.', array('%file' => $source->getFileUri(), '%realpath' => $realpath, '%destination' => $destination));
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    }
    else {
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      watchdog('file', 'File %file could not be copied because the destination %destination is invalid. This is often caused by improper use of file_copy() or a missing stream wrapper.', array('%file' => $source->getFileUri(), '%destination' => $destination));
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    }
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    drupal_set_message(t('The specified file %file could not be copied because the destination is invalid. More information is available in the system log.', array('%file' => $source->getFileUri())), 'error');
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    return FALSE;
  }

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  if ($uri = file_unmanaged_copy($source->getFileUri(), $destination, $replace)) {
    $file = $source->createDuplicate();
    $file->setFileUri($uri);
    $file->setFilename(drupal_basename($uri));
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    // If we are replacing an existing file re-use its database record.
    if ($replace == FILE_EXISTS_REPLACE) {
      $existing_files = entity_load_multiple_by_properties('file', array('uri' => $uri));
      if (count($existing_files)) {
        $existing = reset($existing_files);
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        $file->fid = $existing->id();
        $file->setFilename($existing->getFilename());
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      }
    }
    // If we are renaming around an existing file (rather than a directory),
    // use its basename for the filename.
    elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
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      $file->setFilename(drupal_basename($destination));
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    }

    $file->save();

    // Inform modules that the file has been copied.
    module_invoke_all('file_copy', $file, $source);

    return $file;
  }
  return FALSE;
}

/**
 * Moves a file to a new location and update the file's database entry.
 *
 * Moving a file is performed by copying the file to the new location and then
 * deleting the original.
 * - Checks if $source and $destination are valid and readable/writable.
 * - Performs a file move if $source is not equal to $destination.
 * - If file already exists in $destination either the call will error out,
 *   replace the file or rename the file based on the $replace parameter.
 * - Adds the new file to the files database.
 *
 * @param Drupal\file\File $source
 *   A file entity.
 * @param $destination
 *   A string containing the destination that $source should be moved to.
 *   This must be a stream wrapper URI.
 * @param $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
 *       the destination name exists then its database entry will be updated and
 *       $source->delete() called after invoking hook_file_move().
 *       If no database entry is found then the source files record will be
 *       updated.
 *   - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
 *       unique.
 *   - FILE_EXISTS_ERROR - Do nothing and return FALSE.
 *
 * @return Drupal\file\File
 *   Resulting file entity for success, or FALSE in the event of an error.
 *
 * @see file_unmanaged_move()
 * @see hook_file_move()
 */
function file_move(File $source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
  if (!file_valid_uri($destination)) {
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    if (($realpath = drupal_realpath($source->getFileUri())) !== FALSE) {
      watchdog('file', 'File %file (%realpath) could not be moved because the destination %destination is invalid. This may be caused by improper use of file_move() or a missing stream wrapper.', array('%file' => $source->getFileUri(), '%realpath' => $realpath, '%destination' => $destination));
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    }
    else {
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      watchdog('file', 'File %file could not be moved because the destination %destination is invalid. This may be caused by improper use of file_move() or a missing stream wrapper.', array('%file' => $source->getFileUri(), '%destination' => $destination));
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    }
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    drupal_set_message(t('The specified file %file could not be moved because the destination is invalid. More information is available in the system log.', array('%file' => $source->getFileUri())), 'error');
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    return FALSE;
  }

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  if ($uri = file_unmanaged_move($source->getFileUri(), $destination, $replace)) {
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    $delete_source = FALSE;

    $file = clone $source;
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    $file->setFileUri($uri);
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    // If we are replacing an existing file re-use its database record.
    if ($replace == FILE_EXISTS_REPLACE) {
      $existing_files = entity_load_multiple_by_properties('file', array('uri' => $uri));
      if (count($existing_files)) {
        $existing = reset($existing_files);
        $delete_source = TRUE;
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        $file->fid = $existing->id();
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      }
    }
    // If we are renaming around an existing file (rather than a directory),
    // use its basename for the filename.
    elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
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      $file->setFilename(drupal_basename($destination));
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    }

    $file->save();

    // Inform modules that the file has been moved.
    module_invoke_all('file_move', $file, $source);

    // Delete the original if it's not in use elsewhere.
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    if ($delete_source && !file_usage()->listUsage($source)) {
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      $source->delete();
    }

    return $file;
  }
  return FALSE;
}

/**
 * Checks that a file meets the criteria specified by the validators.
 *
 * After executing the validator callbacks specified hook_file_validate() will
 * also be called to allow other modules to report errors about the file.
 *
 * @param Drupal\file\File $file
 *   A file entity.
 * @param $validators
 *   An optional, associative array of callback functions used to validate the
 *   file. The keys are function names and the values arrays of callback
 *   parameters which will be passed in after the file entity. The
 *   functions should return an array of error messages; an empty array
 *   indicates that the file passed validation. The functions will be called in
 *   the order specified.
 *
 * @return
 *   An array containing validation error messages.
 *
 * @see hook_file_validate()
 */
function file_validate(File $file, $validators = array()) {
  // Call the validation functions specified by this function's caller.
  $errors = array();
  foreach ($validators as $function => $args) {
    if (function_exists($function)) {
      array_unshift($args, $file);
      $errors = array_merge($errors, call_user_func_array($function, $args));
    }
  }

  // Let other modules perform validation on the new file.
  return array_merge($errors, module_invoke_all('file_validate', $file));
}

/**
 * Checks for files with names longer than can be stored in the database.
 *
 * @param Drupal\file\File $file
 *   A file entity.
 *
 * @return
 *   An array. If the file name is too long, it will contain an error message.
 */
function file_validate_name_length(File $file) {
  $errors = array();

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  if (!$file->getFilename()) {
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    $errors[] = t("The file's name is empty. Please give a name to the file.");
  }
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  if (strlen($file->getFilename()) > 240) {
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    $errors[] = t("The file's name exceeds the 240 characters limit. Please rename the file and try again.");
  }
  return $errors;
}

/**
 * Checks that the filename ends with an allowed extension.
 *
 * @param Drupal\file\File $file
 *   A file entity.
 * @param $extensions
 *   A string with a space separated list of allowed extensions.
 *
 * @return
 *   An array. If the file extension is not allowed, it will contain an error
 *   message.
 *
 * @see hook_file_validate()
 */
function file_validate_extensions(File $file, $extensions) {
  $errors = array();

  $regex = '/\.(' . preg_replace('/ +/', '|', preg_quote($extensions)) . ')$/i';
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  if (!preg_match($regex, $file->getFilename())) {
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    $errors[] = t('Only files with the following extensions are allowed: %files-allowed.', array('%files-allowed' => $extensions));
  }
  return $errors;
}

/**
 * Checks that the file's size is below certain limits.
 *
 * @param Drupal\file\File $file
 *   A file entity.
 * @param $file_limit
 *   An integer specifying the maximum file size in bytes. Zero indicates that
 *   no limit should be enforced.
 * @param $user_limit
 *   An integer specifying the maximum number of bytes the user is allowed.
 *   Zero indicates that no limit should be enforced.
 *
 * @return
 *   An array. If the file size exceeds limits, it will contain an error
 *   message.
 *
 * @see hook_file_validate()
 */
function file_validate_size(File $file, $file_limit = 0, $user_limit = 0) {
  global $user;
  $errors = array();

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  if ($file_limit && $file->getSize() > $file_limit) {
    $errors[] = t('The file is %filesize exceeding the maximum file size of %maxsize.', array('%filesize' => format_size($file->getSize()), '%maxsize' => format_size($file_limit)));
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  }
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  // Save a query by only calling spaceUsed() when a limit is provided.
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  if ($user_limit && (Drupal::entityManager()->getStorageController('file')->spaceUsed($user->uid) + $file->getSize()) > $user_limit) {
    $errors[] = t('The file is %filesize which would exceed your disk quota of %quota.', array('%filesize' => format_size($file->getSize()), '%quota' => format_size($user_limit)));
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  }
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  return $errors;
}

/**
 * Checks that the file is recognized by image_get_info() as an image.
 *
 * @param Drupal\file\File $file
 *   A file entity.
 *
 * @return
 *   An array. If the file is not an image, it will contain an error message.
 *
 * @see hook_file_validate()
 */
function file_validate_is_image(File $file) {
  $errors = array();

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  $info = image_get_info($file->getFileUri());
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  if (!$info || empty($info['extension'])) {
    $errors[] = t('Only JPEG, PNG and GIF images are allowed.');
  }

  return $errors;
}

/**
 * Verifies that image dimensions are within the specified maximum and minimum.
 *
 * Non-image files will be ignored. If a image toolkit is available the image
 * will be scaled to fit within the desired maximum dimensions.
 *
 * @param Drupal\file\File $file
 *   A file entity. This function may resize the file affecting its size.
 * @param $maximum_dimensions
 *   An optional string in the form WIDTHxHEIGHT e.g. '640x480' or '85x85'. If
 *   an image toolkit is installed the image will be resized down to these
 *   dimensions. A value of 0 indicates no restriction on size, so resizing
 *   will be attempted.
 * @param $minimum_dimensions
 *   An optional string in the form WIDTHxHEIGHT. This will check that the
 *   image meets a minimum size. A value of 0 indicates no restriction.
 *
 * @return
 *   An array. If the file is an image and did not meet the requirements, it
 *   will contain an error message.
 *
 * @see hook_file_validate()
 */
function file_validate_image_resolution(File $file, $maximum_dimensions = 0, $minimum_dimensions = 0) {
  $errors = array();

  // Check first that the file is an image.
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  if ($info = image_get_info($file->getFileUri())) {
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    if ($maximum_dimensions) {
      // Check that it is smaller than the given dimensions.
      list($width, $height) = explode('x', $maximum_dimensions);
      if ($info['width'] > $width || $info['height'] > $height) {
        // Try to resize the image to fit the dimensions.
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        if ($image = image_load($file->getFileUri())) {
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          image_scale($image, $width, $height);
          image_save($image);
          $file->filesize = $image->info['file_size'];
          drupal_set_message(t('The image was resized to fit within the maximum allowed dimensions of %dimensions pixels.', array('%dimensions' => $maximum_dimensions)));
        }
        else {
          $errors[] = t('The image is too large; the maximum dimensions are %dimensions pixels.', array('%dimensions' => $maximum_dimensions));
        }
      }
    }

    if ($minimum_dimensions) {
      // Check that it is larger than the given dimensions.
      list($width, $height) = explode('x', $minimum_dimensions);
      if ($info['width'] < $width || $info['height'] < $height) {
        $errors[] = t('The image is too small; the minimum dimensions are %dimensions pixels.', array('%dimensions' => $minimum_dimensions));
      }
    }
  }

  return $errors;
}

/**
 * Saves a file to the specified destination and creates a database entry.
 *
 * @param $data
 *   A string containing the contents of the file.
 * @param $destination
 *   A string containing the destination URI. This must be a stream wrapper URI.
 *   If no value is provided, a randomized name will be generated and the file
 *   will be saved using Drupal's default files scheme, usually "public://".
 * @param $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
 *       the destination name exists then its database entry will be updated. If
 *       no database entry is found then a new one will be created.
 *   - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
 *       unique.
 *   - FILE_EXISTS_ERROR - Do nothing and return FALSE.
 *
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 * @return \Drupal\file\FileInterface
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 *   A file entity, or FALSE on error.
 *
 * @see file_unmanaged_save_data()
 */
function file_save_data($data, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
  global $user;

  if (empty($destination)) {
    $destination = file_default_scheme() . '://';
  }
  if (!file_valid_uri($destination)) {
    watchdog('file', 'The data could not be saved because the destination %destination is invalid. This may be caused by improper use of file_save_data() or a missing stream wrapper.', array('%destination' => $destination));
    drupal_set_message(t('The data could not be saved because the destination is invalid. More information is available in the system log.'), 'error');
    return FALSE;
  }

  if ($uri = file_unmanaged_save_data($data, $destination, $replace)) {
    // Create a file entity.
    $file = entity_create('file', array(
      'uri' => $uri,
      'uid' => $user->uid,
      'status' => FILE_STATUS_PERMANENT,
    ));
    // If we are replacing an existing file re-use its database record.
    if ($replace == FILE_EXISTS_REPLACE) {
      $existing_files = entity_load_multiple_by_properties('file', array('uri' => $uri));
      if (count($existing_files)) {
        $existing = reset($existing_files);
537
538
        $file->fid = $existing->id();
        $file->setFilename($existing->getFilename());
539
540
541
542
543
      }
    }
    // If we are renaming around an existing file (rather than a directory),
    // use its basename for the filename.
    elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
544
      $file->setFilename(drupal_basename($destination));
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
    }

    $file->save();
    return $file;
  }
  return FALSE;
}

/**
 * Examines a file entity and returns appropriate content headers for download.
 *
 * @param Drupal\file\File $file
 *   A file entity.
 *
 * @return
 *   An associative array of headers, as expected by
 *   \Symfony\Component\HttpFoundation\StreamedResponse.
 */
function file_get_content_headers(File $file) {
564
565
  $name = mime_header_encode($file->getFilename());
  $type = mime_header_encode($file->getMimeType());
566
567

  return array(
568
    'Content-Type' => $type,
569
    'Content-Length' => $file->getSize(),
570
571
572
573
    'Cache-Control' => 'private',
  );
}

574
/**
575
 * Implements hook_theme().
576
577
578
579
580
 */
function file_theme() {
  return array(
    // file.module.
    'file_link' => array(
581
      'variables' => array('file' => NULL, 'icon_directory' => NULL, 'description' => NULL),
582
583
    ),
    'file_icon' => array(
584
      'variables' => array('file' => NULL, 'icon_directory' => NULL),
585
586
    ),
    'file_managed_file' => array(
587
      'render element' => 'element',
588
589
590
591
    ),

    // file.field.inc.
    'file_widget' => array(
592
      'render element' => 'element',
593
594
    ),
    'file_widget_multiple' => array(
595
      'render element' => 'element',
596
    ),
597
598
599
    'file_formatter_table' => array(
      'variables' => array('items' => NULL),
    ),
600
    'file_upload_help' => array(
601
      'variables' => array('description' => NULL, 'upload_validators' => NULL, 'cardinality' => NULL),
602
603
604
605
606
    ),
  );
}

/**
607
 * Implements hook_file_download().
608
609
610
 *
 * This function takes an extra parameter $field_type so that it may
 * be re-used by other File-like modules, such as Image.
611
 */
612
function file_file_download($uri, $field_type = 'file') {
613
614
615
  global $user;

  // Get the file record based on the URI. If not in the database just return.
616
  $files = entity_load_multiple_by_properties('file', array('uri' => $uri));
617
  if (count($files)) {
618
619
620
    foreach ($files as $item) {
      // Since some database servers sometimes use a case-insensitive comparison
      // by default, double check that the filename is an exact match.
621
      if ($item->getFileUri() === $uri) {
622
623
624
625
        $file = $item;
        break;
      }
    }
626
  }
627
  if (!isset($file)) {
628
629
630
    return;
  }

631
  // Find out which (if any) fields of this type contain the file.
632
  $references = file_get_file_references($file, NULL, FIELD_LOAD_CURRENT, $field_type);
633

634
635
636
637
638
  // Stop processing if there are no references in order to avoid returning
  // headers for files controlled by other modules. Make an exception for
  // temporary files where the host entity has not yet been saved (for example,
  // an image preview on a node/add form) in which case, allow download by the
  // file's owner.
639
  if (empty($references) && ($file->isPermanent() || $file->getOwner()->id() != $user->uid)) {
640
    return;
641
642
  }

643
644
645
646
647
648
649
650
  // Default to allow access.
  $denied = FALSE;
  // Loop through all references of this file. If a reference explicitly allows
  // access to the field to which this file belongs, no further checks are done
  // and download access is granted. If a reference denies access, eventually
  // existing additional references are checked. If all references were checked
  // and no reference denied access, access is granted as well. If at least one
  // reference denied access, access is denied.
651
  foreach ($references as $field_name => $field_references) {
652
653
    foreach ($field_references as $entity_type => $entities) {
      foreach ($entities as $entity) {
654
        $field = field_info_field($field_name);
655
656
        // Check if access to this field is not disallowed.
        if (!field_access('view', $field, $entity_type, $entity)) {
657
          $denied = TRUE;
658
          continue;
659
660
661
662
663
664
        }

        // Invoke hook and collect grants/denies for download access.
        // Default to FALSE and let entities overrule this ruling.
        $grants = array('system' => FALSE);
        foreach (module_implements('file_download_access') as $module) {
665
          $grants = array_merge($grants, array($module => module_invoke($module, 'file_download_access', $field, $entity, $file)));
666
667
        }
        // Allow other modules to alter the returned grants/denies.
668
669
670
671
672
673
        $context = array(
          'entity' => $entity,
          'field' => $field,
          'file' => $file,
        );
        drupal_alter('file_download_access', $grants, $context);
674
675
676
677
678
679
680
681
682
683
684
685
686

        if (in_array(TRUE, $grants)) {
          // If TRUE is returned, access is granted and no further checks are
          // necessary.
          $denied = FALSE;
          break 3;
        }

        if (in_array(FALSE, $grants)) {
          // If an implementation returns FALSE, access to this entity is denied
          // but the file could belong to another entity to which the user might
          // have access. Continue with these.
          $denied = TRUE;
687
688
689
690
691
        }
      }
    }
  }

692
693
  // Access specifically denied.
  if ($denied) {
694
695
696
697
    return -1;
  }

  // Access is granted.
698
699
  $headers = file_get_content_headers($file);
  return $headers;
700
701
}

702
703
704
705
/**
 * Implements file_cron()
 */
function file_cron() {
706
  $result = Drupal::entityManager()->getStorageController('file')->retrieveTemporaryFiles();
707
708
  foreach ($result as $row) {
    if ($file = file_load($row->fid)) {
709
      $references = file_usage()->listUsage($file);
710
      if (empty($references)) {
711
        if (file_exists($file->getFileUri())) {
712
713
714
          $file->delete();
        }
        else {
715
          watchdog('file system', 'Could not delete temporary file "%path" during garbage collection', array('%path' => $file->getFileUri()), WATCHDOG_ERROR);
716
717
718
        }
      }
      else {
719
        watchdog('file system', 'Did not delete temporary file "%path" during garbage collection because it is in use by the following modules: %modules.', array('%path' => $file->getFileUri(), '%modules' => implode(', ', array_keys($references))), WATCHDOG_INFO);
720
721
722
723
724
      }
    }
  }
}

725
/**
726
727
 * Ajax callback: Processes file uploads and deletions.
 *
728
729
730
731
 * This rebuilds the form element for a particular field item. As long as the
 * form processing is properly encapsulated in the widget element the form
 * should rebuild correctly using FAPI without the need for additional callbacks
 * or processing.
732
733
 *
 * @see file_menu()
734
735
736
737
738
739
740
741
 */
function file_ajax_upload() {
  $form_parents = func_get_args();
  $form_build_id = (string) array_pop($form_parents);

  if (empty($_POST['form_build_id']) || $form_build_id != $_POST['form_build_id']) {
    // Invalid request.
    drupal_set_message(t('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (@size) that this server supports.', array('@size' => format_size(file_upload_max_size()))), 'error');
742
743
    $response = new AjaxResponse();
    return $response->addCommand(new ReplaceCommand(NULL, theme('status_messages')));
744
745
  }

746
  list($form, $form_state) = ajax_get_form();
747
748
749
750

  if (!$form) {
    // Invalid form_build_id.
    drupal_set_message(t('An unrecoverable error occurred. Use of this form has expired. Try reloading the page and submitting again.'), 'error');
751
752
    $response = new AjaxResponse();
    return $response->addCommand(new ReplaceCommand(NULL, theme('status_messages')));
753
754
755
756
757
758
759
760
761
  }

  // Get the current element and count the number of files.
  $current_element = $form;
  foreach ($form_parents as $parent) {
    $current_element = $current_element[$parent];
  }
  $current_file_count = isset($current_element['#file_upload_delta']) ? $current_element['#file_upload_delta'] : 0;

762
763
  // Process user input. $form and $form_state are modified in the process.
  drupal_process_form($form['#form_id'], $form, $form_state);
764
765
766
767
768
769

  // Retrieve the element to be rendered.
  foreach ($form_parents as $parent) {
    $form = $form[$parent];
  }

770
  // Add the special Ajax class if a new file was added.
771
772
773
774
775
776
777
778
  if (isset($form['#file_upload_delta']) && $current_file_count < $form['#file_upload_delta']) {
    $form[$current_file_count]['#attributes']['class'][] = 'ajax-new-content';
  }
  // Otherwise just add the new content class on a placeholder.
  else {
    $form['#suffix'] .= '<span class="ajax-new-content"></span>';
  }

779
780
  $form['#prefix'] .= theme('status_messages');
  $output = drupal_render($form);
781
  $js = drupal_add_js();
782
  $settings = drupal_merge_js_settings($js['settings']['data']);
783

784
785
  $response = new AjaxResponse();
  return $response->addCommand(new ReplaceCommand(NULL, $output, $settings));
786
787
788
}

/**
789
790
 * Ajax callback: Retrieves upload progress.
 *
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
 * @param $key
 *   The unique key for this upload process.
 */
function file_ajax_progress($key) {
  $progress = array(
    'message' => t('Starting upload...'),
    'percentage' => -1,
  );

  $implementation = file_progress_implementation();
  if ($implementation == 'uploadprogress') {
    $status = uploadprogress_get_info($key);
    if (isset($status['bytes_uploaded']) && !empty($status['bytes_total'])) {
      $progress['message'] = t('Uploading... (@current of @total)', array('@current' => format_size($status['bytes_uploaded']), '@total' => format_size($status['bytes_total'])));
      $progress['percentage'] = round(100 * $status['bytes_uploaded'] / $status['bytes_total']);
    }
  }
  elseif ($implementation == 'apc') {
    $status = apc_fetch('upload_' . $key);
    if (isset($status['current']) && !empty($status['total'])) {
      $progress['message'] = t('Uploading... (@current of @total)', array('@current' => format_size($status['current']), '@total' => format_size($status['total'])));
      $progress['percentage'] = round(100 * $status['current'] / $status['total']);
    }
  }

816
  return new JsonResponse($progress);
817
818
819
}

/**
820
 * Determines the preferred upload progress implementation.
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
 *
 * @return
 *   A string indicating which upload progress system is available. Either "apc"
 *   or "uploadprogress". If neither are available, returns FALSE.
 */
function file_progress_implementation() {
  static $implementation;
  if (!isset($implementation)) {
    $implementation = FALSE;

    // We prefer the PECL extension uploadprogress because it supports multiple
    // simultaneous uploads. APC only supports one at a time.
    if (extension_loaded('uploadprogress')) {
      $implementation = 'uploadprogress';
    }
    elseif (extension_loaded('apc') && ini_get('apc.rfc1867')) {
      $implementation = 'apc';
    }
  }
  return $implementation;
}

/**
844
 * Implements hook_file_predelete().
845
 */
846
function file_file_predelete(File $file) {
847
848
849
850
  // TODO: Remove references to a file that is in-use.
}

/**
851
 * Render API callback: Expands the managed_file element type.
852
853
854
 *
 * Expands the file type to include Upload and Remove buttons, as well as
 * support for a default value.
855
856
 *
 * This function is assigned as a #process callback in file_element_info().
857
858
 */
function file_managed_file_process($element, &$form_state, $form) {
859
860
861
  // Append the '-upload' to the #id so the field label's 'for' attribute
  // corresponds with the file element.
  $element['#id'] .= '-upload';
862
863
864
865
866

  // This is used sometimes so let's implode it just once.
  $parents_prefix = implode('_', $element['#parents']);

  $fids = isset($element['#value']['fids']) ? $element['#value']['fids'] : array();
867
868
869

  // Set some default element properties.
  $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
870
  $element['#files'] = !empty($fids) ? file_load_multiple($fids) : FALSE;
871
872
873
  $element['#tree'] = TRUE;

  $ajax_settings = array(
874
    'path' => 'file/ajax/' . implode('/', $element['#array_parents']) . '/' . $form['form_build_id']['#value'],
875
876
877
878
879
880
881
882
883
884
    'wrapper' => $element['#id'] . '-ajax-wrapper',
    'effect' => 'fade',
    'progress' => array(
      'type' => $element['#progress_indicator'],
      'message' => $element['#progress_message'],
    ),
  );

  // Set up the buttons first since we need to check if they were clicked.
  $element['upload_button'] = array(
885
    '#name' => $parents_prefix . '_upload_button',
886
887
888
889
    '#type' => 'submit',
    '#value' => t('Upload'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
890
    '#limit_validation_errors' => array($element['#parents']),
891
892
893
894
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

895
896
897
  // Force the progress indicator for the remove button to be either 'none' or
  // 'throbber', even if the upload button is using something else.
  $ajax_settings['progress']['type'] = ($element['#progress_indicator'] == 'none') ? 'none' : 'throbber';
898
899
900
  $ajax_settings['progress']['message'] = NULL;
  $ajax_settings['effect'] = 'none';
  $element['remove_button'] = array(
901
    '#name' => $parents_prefix . '_remove_button',
902
    '#type' => 'submit',
903
    '#value' => $element['#multiple'] ? t('Remove selected') : t('Remove'),
904
905
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
906
    '#limit_validation_errors' => array($element['#parents']),
907
    '#ajax' => $ajax_settings,
908
    '#weight' => 1,
909
910
  );

911
  $element['fids'] = array(
912
    '#type' => 'hidden',
913
    '#value' => $fids,
914
915
916
917
  );

  // Add progress bar support to the upload if possible.
  if ($element['#progress_indicator'] == 'bar' && $implementation = file_progress_implementation()) {
918
    $upload_progress_key = mt_rand();
919
920
921
922
923
924

    if ($implementation == 'uploadprogress') {
      $element['UPLOAD_IDENTIFIER'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
925
926
927
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
928
929
930
931
932
933
934
      );
    }
    elseif ($implementation == 'apc') {
      $element['APC_UPLOAD_PROGRESS'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
935
936
937
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
938
939
940
941
942
943
944
945
946
      );
    }

    // Add the upload progress callback.
    $element['upload_button']['#ajax']['progress']['path'] = 'file/progress/' . $upload_progress_key;
  }

  // The file upload field itself.
  $element['upload'] = array(
947
    '#name' => 'files[' . $parents_prefix . ']',
948
    '#type' => 'file',
949
950
    '#title' => t('Choose a file'),
    '#title_display' => 'invisible',
951
    '#size' => $element['#size'],
952
    '#multiple' => $element['#multiple'],
953
954
955
956
    '#theme_wrappers' => array(),
    '#weight' => -10,
  );

957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
  if (!empty($fids) && $element['#files']) {
    foreach ($element['#files'] as $delta => $file) {
      if ($element['#multiple']) {
        $element['file_' . $delta]['selected'] = array(
          '#type' => 'checkbox',
          '#title' => theme('file_link', array('file' => $file)) . ' ',
        );
      }
      else {
        $element['file_' . $delta]['filename'] = array(
          '#type' => 'markup',
          '#markup' => theme('file_link', array('file' => $file)) . ' ',
          '#weight' => -10,
        );
      }
    }
973
974
  }

975
  // Add the extension list to the page as JavaScript settings.
976
  if (isset($element['#upload_validators']['file_validate_extensions'][0])) {
977
978
979
980
981
982
983
    $extension_list = implode(',', array_filter(explode(' ', $element['#upload_validators']['file_validate_extensions'][0])));
    $element['upload']['#attached']['js'] = array(
      array(
        'type' => 'setting',
        'data' => array('file' => array('elements' => array('#' . $element['#id'] . '-upload' => $extension_list)))
      )
    );
984
985
  }

986
  // Prefix and suffix used for Ajax replacement.
987
988
989
990
991
992
993
  $element['#prefix'] = '<div id="' . $element['#id'] . '-ajax-wrapper">';
  $element['#suffix'] = '</div>';

  return $element;
}

/**
994
995
996
 * Render API callback: Determines the value for a managed_file type element.
 *
 * This function is assigned as a #value_callback in file_element_info().
997
998
 */
function file_managed_file_value(&$element, $input = FALSE, $form_state = NULL) {
999
1000
1001
1002
  // Find the current value of this field.
  $fids = !empty($input['fids']) ? explode(' ', $input['fids']) : array();
  foreach ($fids as $key => $fid) {
    $fids[$key] = (int) $fid;
1003
1004
1005
1006
  }

  // Process any input and save new uploads.
  if ($input !== FALSE) {
1007
    $input['fids'] = $fids;
1008
1009
1010
    $return = $input;

    // Uploads take priority over all other values.
1011
1012
1013
1014
1015
1016
1017
    if ($files = file_managed_file_save_upload($element)) {
      if ($element['#multiple']) {
        $fids = array_merge($fids, array_keys($files));
      }
      else {
        $fids = array_keys($files);
      }
1018
1019
1020
1021
1022
1023
1024
1025
    }
    else {
      // Check for #filefield_value_callback values.
      // Because FAPI does not allow multiple #value_callback values like it
      // does for #element_validate and #process, this fills the missing
      // functionality to allow File fields to be extended through FAPI.
      if (isset($element['#file_value_callbacks'])) {
        foreach ($element['#file_value_callbacks'] as $callback) {
1026
          $callback($element, $input, $form_state);
1027
1028
        }
      }
1029
1030
1031
1032
1033
1034

      // Load files if the FIDs have changed to confirm they exist.
      if (!empty($input['fids'])) {
        $fids = array();
        foreach ($input['fids'] as $key => $fid) {
          if ($file = file_load($fid)) {
1035
            $fids[] = $file->id();
1036
1037
          }
        }
1038
1039
1040
1041
1042
1043
1044
      }
    }
  }

  // If there is no input, set the default value.
  else {
    if ($element['#extended']) {
1045
1046
      $default_fids = isset($element['#default_value']['fids']) ? $element['#default_value']['fids'] : array();
      $return = isset($element['#default_value']) ? $element['#default_value'] : array('fids' => array());
1047
1048
    }
    else {
1049
1050
      $default_fids = isset($element['#default_value']) ? $element['#default_value'] : array();
      $return = array('fids' => array());
1051
1052
1053
    }

    // Confirm that the file exists when used as a default value.
1054
1055
1056
1057
    if (!empty($default_fids)) {
      $fids = array();
      foreach ($default_fids as $key => $fid) {
        if ($file = file_load($fid)) {
1058
          $fids[] = $file->id();
1059
1060
        }
      }
1061
1062
1063
    }
  }

1064
  $return['fids'] = $fids;
1065
1066
1067
1068
  return $return;
}

/**
1069
1070
1071
1072
 * Render API callback: Validates the managed_file element.
 *
 * This function is assigned as a #element_validate callback in
 * file_element_info().
1073
1074
1075
1076
1077
 */
function file_managed_file_validate(&$element, &$form_state) {
  // If referencing an existing file, only allow if there are existing
  // references. This prevents unmanaged files from being deleted if this
  // item were to be deleted.
1078
  $clicked_button = end($form_state['triggering_element']['#parents']);
1079
1080
1081
1082
  if ($clicked_button != 'remove_button' && !empty($element['fids']['#value'])) {
    $fids = $element['fids']['#value'];
    foreach ($fids as $fid) {
      if ($file = file_load($fid)) {
1083
        if ($file->isPermanent()) {
1084
1085
1086
1087
          $references = file_usage()->listUsage($file);
          if (empty($references)) {
            form_error($element, t('The file used in the !name field may not be referenced.', array('!name' => $element['#title'])));
          }
1088
1089
        }
      }
1090
1091
1092
      else {
        form_error($element, t('The file referenced by the !name field does not exist.', array('!name' => $element['#title'])));
      }
1093
1094
1095
1096
    }
  }

  // Check required property based on the FID.
1097
  if ($element['#required'] && empty($element['fids']['#value']) && !in_array($clicked_button, array('upload_button', 'remove_button'))) {
1098
1099
1100
    form_error($element['upload'], t('!name field is required.', array('!name' => $element['#title'])));
  }

1101
  // Consolidate the array value of this field to array of FIDs.
1102
  if (!$element['#extended']) {
1103
    form_set_value($element, $element['fids']['#value'], $form_state);
1104
1105
1106
1107
  }
}

/**
1108
1109
1110
 * Form submission handler for upload / remove buttons of managed_file elements.
 *
 * @see file_managed_file_process()
1111
1112
 */
function file_managed_file_submit($form, &$form_state) {
1113
1114
1115
1116
  // Determine whether it was the upload or the remove button that was clicked,
  // and set $element to the managed_file element that contains that button.
  $parents = $form_state['triggering_element']['#array_parents'];
  $button_key = array_pop($parents);
1117
  $element = NestedArray::getValue($form, $parents);
1118
1119
1120
1121
1122
1123

  // No action is needed here for the upload button, because all file uploads on
  // the form are processed by file_managed_file_value() regardless of which
  // button was clicked. Action is needed here for the remove button, because we
  // only remove a file in response to its remove button being clicked.
  if ($button_key == 'remove_button') {
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
    $fids = array_keys($element['#files']);
    // Get files that will be removed.
    if ($element['#multiple']) {
      $remove_fids = array();
      foreach (element_children($element) as $name) {
        if (strpos($name, 'file_') === 0 && $element[$name]['selected']['#value']) {
          $remove_fids[] = (int) substr($name, 5);
        }
      }
      $fids = array_diff($fids, $remove_fids);
    }
    else {
1136
1137
1138
      // If we deal with single upload element remove the file and set
      // element's value to empty array (file could not be removed from
      // element if we don't do that).
1139
      $remove_fids = $fids;
1140
      $fids = array();
1141
1142
1143
1144
1145
1146
    }

    foreach ($remove_fids as $fid) {
      // If it's a temporary file we can safely remove it immediately, otherwise
      // it's up to the implementing module to remove usages of files to have them
      // removed.
1147
1148
      if ($element['#files'][$fid] && $element['#files'][$fid]->isTemporary()) {
        $element['#files'][$fid]->delete();
1149
      }
1150
1151
1152
1153
1154
1155
1156
    }
    // Update both $form_state['values'] and $form_state['input'] to reflect
    // that the file has been removed, so that the form is rebuilt correctly.
    // $form_state['values'] must be updated in case additional submit handlers
    // run, and for form building functions that run during the rebuild, such as
    // when the managed_file element is part of a field widget.
    // $form_state['input'] must be updated so that file_managed_file_value()
1157
    // has correct information during the rebuild.
1158
1159
    form_set_value($element['fids'], implode(' ', $fids), $form_state);
    NestedArray::setValue($form_state['input'], $element['fids']['#parents'], implode(' ', $fids));
1160
1161
1162
1163
1164
1165
1166
1167
1168
  }

  // Set the form to rebuild so that $form is correctly updated in response to
  // processing the file removal. Since this function did not change $form_state
  // if the upload button was clicked, a rebuild isn't necessary in that
  // situation and setting $form_state['redirect'] to FALSE would suffice.
  // However, we choose to always rebuild, to keep the form processing workflow
  // consistent between the two buttons.
  $form_state['rebuild'] = TRUE;
1169
1170
1171
}

/**
1172
 * Saves any files that have been uploaded into a managed_file element.
1173
1174
1175
 *
 * @param $element
 *   The FAPI element whose values are being saved.
1176
 *
1177
 * @return
1178
1179
 *   An array of file entities for each file that was saved, keyed by its file
 *   ID, or FALSE if no files were saved.
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
 */
function file_managed_file_save_upload($element) {
  $upload_name = implode('_', $element['#parents']);
  if (empty($_FILES['files']['name'][$upload_name])) {
    return FALSE;
  }

  $destination = isset($element['#upload_location']) ? $element['#upload_location'] : NULL;
  if (isset($destination) && !file_prepare_directory($destination, FILE_CREATE_DIRECTORY)) {
    watchdog('file', 'The upload directory %directory for the file field !name could not be created or is not accessible. A newly uploaded file could not be saved in this directory as a consequence, and the upload was canceled.', array('%directory' => $destination, '!name' => $element['#field_name']));
    form_set_error($upload_name, t('The file could not be uploaded.'));
    return FALSE;
  }

1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
  // Save attached files to the database.
  $files_uploaded = $element['#multiple'] && count(array_filter($_FILES['files']['name'][$upload_name])) > 0;
  $files_uploaded |= !$element['#multiple'] && !empty($_FILES['files']['name'][$upload_name]);
  if ($files_uploaded) {
    if (!$files = file_save_upload($upload_name, $element['#upload_validators'], $destination)) {
      watchdog('file', 'The file upload failed. %upload', array('%upload' => $upload_name));
      form_set_error($upload_name, t('Files in the !name field were unable to be uploaded.', array('!name' => $element['#title'])));
      return array();
    }

    // Value callback expects FIDs to be keys.
    $files = array_filter($files);
1206
    $fids = array_map(function($file) { return $file->id(); }, $files);
1207
1208

    return empty($files) ? array() : array_combine($fids, $files);
1209
1210
  }

1211
  return array();
1212
1213
1214
}

/**
1215
1216
1217
1218
1219
1220
1221
 * Returns HTML for a managed file element.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element representing the file.
 *
 * @ingroup themeable
1222
 */
1223
1224
1225
function theme_file_managed_file($variables) {
  $element = $variables['element'];

1226
1227
1228
1229
1230
1231
1232
1233
1234
  $attributes = array();
  if (isset($element['#id'])) {
    $attributes['id'] = $element['#id'];
  }
  if (!empty($element['#attributes']['class'])) {
    $attributes['class'] = (array) $element['#attributes']['class'];
  }
  $attributes['class'][] = 'form-managed-file';

1235
1236
  // This wrapper is required to apply JS behaviors and CSS styling.
  $output = '';
1237
  $output .= '<div' . new Attribute($attributes) . '>';
1238
1239
1240
1241
1242
  $output .= drupal_render_children($element);
  $output .= '</div>';
  return $output;
}

1243
/**
1244
 * Render API callback: Hides display of the upload or remove controls.
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
 *
 * Upload controls are hidden when a file is already uploaded. Remove controls
 * are hidden when there is no file attached. Controls are hidden here instead
 * of in file_managed_file_process(), because #access for these buttons depends
 * on the managed_file element's #value. See the documentation of form_builder()
 * for more detailed information about the relationship between #process,
 * #value, and #access.
 *
 * Because #access is set here, it affects display only and does not prevent
 * JavaScript or other untrusted code from submitting the form as though access
 * were enabled. The form processing functions for these elements should not
 * assume that the buttons can't be "clicked" just because they are not
 * displayed.
 *
1259
1260
 * This function is assigned as a #pre_render callback in file_element_info().
 *
1261
1262
1263
1264
1265
 * @see file_managed_file_process()
 * @see form_builder()
 */
function file_managed_file_pre_render($element) {
  // If we already have a file, we don't want to show the upload controls.
1266
1267
1268
1269
1270
  if (!empty($element['#value']['fids'])) {
    if (!$element['#multiple']) {
      $element['upload']['#access'] = FALSE;
      $element['upload_button']['#access'] = FALSE;
    }
1271
1272
1273
1274
1275
1276
1277
1278
  }
  // If we don't already have a file, there is nothing to remove.
  else {
    $element['remove_button']['#access'] = FALSE;
  }
  return $element;
}

1279
/**
1280
 * Returns HTML for a link to a file.
1281
 *
1282
1283
1284
 * @param $variables
 *   An associative array containing:
 *   - file: A file object to which the link will be created.
1285
 *   - icon_directory: (optional) A path to a directory of icons to be used for
1286
1287
 *     files. Defaults to the value of the "icon.directory"
 *     variable.
1288
 *   - description: A description to be displayed instead of the filename.
1289
1290
 *
 * @ingroup themeable
1291
 */
1292
1293
function theme_file_link($variables) {
  $file = $variables['file'];
1294
  $icon_directory = $variables['icon_directory'];
1295

1296
  $url = file_create_url($file->getFileUri());
1297
  // theme_file_icon() requires a file entity, make sure it gets one.
1298
  $icon = theme('file_icon', array('file' => $file, 'icon_directory' => $icon_directory));
1299
1300
1301
1302
1303

  // Set options as per anchor format described at
  // http://microformats.org/wiki/file-format-examples
  $options = array(
    'attributes' => array(
1304
      'type' => $file->getMimeType() . '; length=' . $file->getSize(),
1305
1306
1307
1308
    ),
  );

  // Use the description as the link text if available.
1309
  if (empty($variables['description'])) {
1310
    $link_text = $file->getFilename();
1311
1312
  }
  else {
1313
    $link_text = $variables['description'];
1314
    $options['attributes']['title'] = check_plain($file->getFilename());
1315
1316
1317
1318
1319
1320
  }

  return '<span class="file">' . $icon . ' ' . l($link_text, $url, $options) . '</span>';
}

/**
1321
 * Returns HTML for an image with an appropriate icon for the given file.
1322
 *
1323