file.module 74.8 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\Component\Utility\String;
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use Drupal\Core\Field\FieldDefinitionInterface;
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use Drupal\Core\Render\Element;
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use Drupal\Core\Routing\RouteMatchInterface;
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use Drupal\file\Entity\File;
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use Drupal\file\FileInterface;
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use Drupal\Component\Utility\NestedArray;
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use Drupal\Component\Utility\Unicode;
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use Drupal\Core\Entity\EntityStorageInterface;
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use Drupal\Core\Template\Attribute;
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use Drupal\file\FileUsage\FileUsageInterface;
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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().
 */
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function file_help($route_name, RouteMatchInterface $route_match) {
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  switch ($route_name) {
    case 'help.page.file':
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      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
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      $output .= '<p>' . t('The File module allows you to create fields that contain files. See the <a href="!field">Field module help</a> and the <a href="!field_ui">Field UI help</a> pages for general information on fields and how to create and manage them. For more information, see the <a href="!file_documentation">online documentation for the File module</a>.', array('!field' => \Drupal::url('help.page', array('name' => 'field')), '!field_ui' => \Drupal::url('help.page', array('name' => 'field_ui')), '!file_documentation' => 'https://drupal.org/documentation/modules/file')) . '</p>';
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      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
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      $output .= '<dt>' . t('Managing and displaying file fields') . '</dt>';
      $output .= '<dd>' . t('The <em>settings</em> and the <em>display</em> of the file field can be configured separately. See the <a href="!field_ui">Field UI help</a> for more information on how to manage fields and their display.', array('!field_ui' => \Drupal::url('help.page', array('name' => 'field_ui')))) . '</dd>';
      $output .= '<dt>' . t('Allowing file extensions') . '</dt>';
      $output .= '<dd>' . t('In the field settings, you can define the allowed file extensions (for example <em>pdf docx psd</em>) for the files that will be uploaded with the file field.') . '</dd>';
      $output .= '<dt>' . t('Storing files ') . '</dt>';
      $output .= '<dd>' . t('Uploaded files can either be stored as <em>public</em> or <em>private</em>, depending on the <a href="!file-system">File system settings</a>. For more information, see the <a href="!system-help">System module help page</a>.', array('!file-system' => \Drupal::url('system.file_system_settings'), '!system-help' => \Drupal::url('help.page', array('name' => 'system')))) . '</dd>';
      $output .= '<dt>' . t('Restricting the maximum file size') . '</dt>';
      $output .= '<dd>' . t('The maximum file size that users can upload is limited by PHP settings of the server, but you can restrict by entering the desired value as the <em>Maximum upload size</em> setting. The maximum file size is automatically displayed to users in the help text of the file field.') . '</dd>';
      $output .= '<dt>' . t('Displaying files and descriptions') . '<dt>';
      $output .= '<dd>' . t('In the field settings, you can allow users to toggle whether individual files are displayed. In the display settings, you can then choose one of the following formats: <ul><li><em>Generic file</em> displays links to the files and adds icons that symbolize the file extensions. If <em>descriptions</em> are enabled and have been submitted, then the description is displayed instead of the file name.</li><li><em>URL to file</em> displays the full path to the file as plain text.</li><li><em>Table of files</em> lists links to the files and the file sizes in a table.</li><li><em>RSS enclosure</em> only displays the first file, and only in a RSS feed, formatted according to the RSS 2.0 syntax for enclosures.</li></ul> A file can still be linked to directly by its URI even if it is not displayed.') . '</dd>';
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      $output .= '</dl>';
      return $output;
  }
}

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/**
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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() {
  $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('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.
 *
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 * @deprecated in Drupal 8.x, will be removed before Drupal 9.0.
 *   Use \Drupal\file\Entity\File::loadMultiple().
 *
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 * @see hook_ENTITY_TYPE_load()
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 * @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, $reset = FALSE) {
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  if ($reset) {
    \Drupal::entityManager()->getStorage('file')->resetCache($fids);
  }
  return File::loadMultiple($fids);
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}

/**
 * Loads a single file entity from the database.
 *
 * @param $fid
 *   A file ID.
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 * @param $reset
 *   Whether to reset the internal file_load_multiple() cache.
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 *
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 * @return \Drupal\file\FileInterface
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 *   A file entity or NULL if the file was not found.
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 *
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 * @deprecated in Drupal 8.x, will be removed before Drupal 9.0.
 *   Use \Drupal\file\Entity\File::load().
 *
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 * @see hook_ENTITY_TYPE_load()
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 * @see file_load_multiple()
 */
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function file_load($fid, $reset = FALSE) {
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  if ($reset) {
    \Drupal::entityManager()->getStorage('file')->resetCache(array($fid));
  }
  return File::load($fid);
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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.
 * - If file already exists in $destination either the call will error out,
 *   replace the file or rename the file based on the $replace parameter.
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 * - If the $source and $destination are equal, the behavior depends on the
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 *   $replace parameter. FILE_EXISTS_REPLACE will error out. FILE_EXISTS_RENAME
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 *   will rename the file until the $destination is unique.
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 * - 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.
 *
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 * @param \Drupal\file\FileInterface $source
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 *   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()
 */
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function file_copy(FileInterface $source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
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  if (!file_valid_uri($destination)) {
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    if (($realpath = drupal_realpath($source->getFileUri())) !== FALSE) {
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      \Drupal::logger('file')->notice('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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      \Drupal::logger('file')->notice('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.
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    // @todo Do not create a new entity in order to update it, see
    //   https://drupal.org/node/2241865
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    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();
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        $file->setOriginalId($existing->id());
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        $file->setFilename($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.
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    \Drupal::moduleHandler()->invokeAll('file_copy', array($file, $source));
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    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.
 *
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 * @param \Drupal\file\FileInterface $source
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 *   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.
 *
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 * @return \Drupal\file\FileInterface
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 *   Resulting file entity for success, or FALSE in the event of an error.
 *
 * @see file_unmanaged_move()
 * @see hook_file_move()
 */
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function file_move(FileInterface $source, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
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  if (!file_valid_uri($destination)) {
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    if (($realpath = drupal_realpath($source->getFileUri())) !== FALSE) {
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      \Drupal::logger('file')->notice('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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      \Drupal::logger('file')->notice('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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        $file->uuid = $existing->uuid();
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      }
    }
    // If we are renaming around an existing file (rather than a directory),
    // use its basename for the filename.
    elseif ($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.
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    \Drupal::moduleHandler()->invokeAll('file_move', array($file, $source));
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    // Delete the original if it's not in use elsewhere.
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    if ($delete_source && !\Drupal::service('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.
 *
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 * @param \Drupal\file\FileInterface $file
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 *   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()
 */
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function file_validate(FileInterface $file, $validators = array()) {
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  // 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.
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  return array_merge($errors, \Drupal::moduleHandler()->invokeAll('file_validate', array($file)));
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}

/**
 * Checks for files with names longer than can be stored in the database.
 *
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 * @param \Drupal\file\FileInterface $file
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 *   A file entity.
 *
 * @return
 *   An array. If the file name is too long, it will contain an error message.
 */
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function file_validate_name_length(FileInterface $file) {
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  $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.
 *
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 * @param \Drupal\file\FileInterface $file
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 *   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()
 */
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function file_validate_extensions(FileInterface $file, $extensions) {
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  $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.
 *
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 * @param \Drupal\file\FileInterface $file
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 *   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()
 */
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function file_validate_size(FileInterface $file, $file_limit = 0, $user_limit = 0) {
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  $user = \Drupal::currentUser();
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  $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()->getStorage('file')->spaceUsed($user->id()) + $file->getSize()) > $user_limit) {
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    $errors[] = t('The file is %filesize which would exceed your disk quota of %quota.', array('%filesize' => format_size($file->getSize()), '%quota' => format_size($user_limit)));
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  }
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  return $errors;
}

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

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  $image_factory = \Drupal::service('image.factory');
  $image = $image_factory->get($file->getFileUri());
  if (!$image->isValid()) {
    $supported_extensions = $image_factory->getSupportedExtensions();
    $errors[] = t('Image type not supported. Allowed types: %types', array('%types' => implode(' ', $supported_extensions)));
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  }

  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.
 *
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 * @param \Drupal\file\FileInterface $file
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 *   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()
 */
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function file_validate_image_resolution(FileInterface $file, $maximum_dimensions = 0, $minimum_dimensions = 0) {
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  $errors = array();

  // Check first that the file is an image.
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  $image_factory = \Drupal::service('image.factory');
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  $image = $image_factory->get($file->getFileUri());
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  if ($image->isValid()) {
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    if ($maximum_dimensions) {
      // Check that it is smaller than the given dimensions.
      list($width, $height) = explode('x', $maximum_dimensions);
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      if ($image->getWidth() > $width || $image->getHeight() > $height) {
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        // Try to resize the image to fit the dimensions.
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        if ($image->scale($width, $height)) {
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          $image->save();
          $file->filesize = $image->getFileSize();
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          drupal_set_message(t('The image was resized to fit within the maximum allowed dimensions of %dimensions pixels.', array('%dimensions' => $maximum_dimensions)));
        }
        else {
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          $errors[] = t('The image exceeds the maximum allowed dimensions and an attempt to resize it failed.');
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        }
      }
    }

    if ($minimum_dimensions) {
      // Check that it is larger than the given dimensions.
      list($width, $height) = explode('x', $minimum_dimensions);
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      if ($image->getWidth() < $width || $image->getHeight() < $height) {
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        $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 $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
 *       the destination name exists then its database entry will be updated. If
 *       no database entry is found then a new one will be created.
 *   - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
 *       unique.
 *   - FILE_EXISTS_ERROR - Do nothing and return FALSE.
 *
502
 * @return \Drupal\file\FileInterface
503
504
505
506
507
 *   A file entity, or FALSE on error.
 *
 * @see file_unmanaged_save_data()
 */
function file_save_data($data, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
508
  $user = \Drupal::currentUser();
509
510
511
512
513

  if (empty($destination)) {
    $destination = file_default_scheme() . '://';
  }
  if (!file_valid_uri($destination)) {
514
    \Drupal::logger('file')->notice('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));
515
516
517
518
519
520
521
522
    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,
523
      'uid' => $user->id(),
524
525
526
      'status' => FILE_STATUS_PERMANENT,
    ));
    // If we are replacing an existing file re-use its database record.
527
528
    // @todo Do not create a new entity in order to update it, see
    //   https://drupal.org/node/2241865
529
530
531
532
    if ($replace == FILE_EXISTS_REPLACE) {
      $existing_files = entity_load_multiple_by_properties('file', array('uri' => $uri));
      if (count($existing_files)) {
        $existing = reset($existing_files);
533
        $file->fid = $existing->id();
534
        $file->setOriginalId($existing->id());
535
        $file->setFilename($existing->getFilename());
536
537
538
539
540
      }
    }
    // 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)) {
541
      $file->setFilename(drupal_basename($destination));
542
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544
545
546
547
548
549
550
551
552
    }

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

/**
 * Examines a file entity and returns appropriate content headers for download.
 *
553
 * @param \Drupal\file\FileInterface $file
554
555
556
557
558
559
 *   A file entity.
 *
 * @return
 *   An associative array of headers, as expected by
 *   \Symfony\Component\HttpFoundation\StreamedResponse.
 */
560
function file_get_content_headers(FileInterface $file) {
561
  $type = mime_header_encode($file->getMimeType());
562
563

  return array(
564
    'Content-Type' => $type,
565
    'Content-Length' => $file->getSize(),
566
567
568
569
    'Cache-Control' => 'private',
  );
}

570
/**
571
 * Implements hook_theme().
572
573
574
 */
function file_theme() {
  return array(
575
    // From file.module.
576
    'file_link' => array(
577
      'variables' => array('file' => NULL, 'icon_directory' => NULL, 'description' => NULL, 'attributes' => array()),
578
      'template' => 'file-link',
579
580
    ),
    'file_managed_file' => array(
581
      'render element' => 'element',
582
      'template' => 'file-managed-file',
583
584
    ),

585
    // From file.field.inc.
586
    'file_widget' => array(
587
      'render element' => 'element',
588
589
      'template' => 'file-widget',
      'file' => 'file.field.inc',
590
591
    ),
    'file_widget_multiple' => array(
592
      'render element' => 'element',
593
594
      'template' => 'file-widget-multiple',
      'file' => 'file.field.inc',
595
    ),
596
    'file_upload_help' => array(
597
      'variables' => array('description' => NULL, 'upload_validators' => NULL, 'cardinality' => NULL),
598
599
      'template' => 'file-upload-help',
      'file' => 'file.field.inc',
600
601
602
603
604
    ),
  );
}

/**
605
 * Implements hook_file_download().
606
607
608
 *
 * This function takes an extra parameter $field_type so that it may
 * be re-used by other File-like modules, such as Image.
609
 */
610
function file_file_download($uri, $field_type = 'file') {
611
  $user = \Drupal::currentUser();
612
613

  // Get the file record based on the URI. If not in the database just return.
614
  /** @var \Drupal\file\FileInterface[] $files */
615
  $files = entity_load_multiple_by_properties('file', array('uri' => $uri));
616
  if (count($files)) {
617
618
619
    foreach ($files as $item) {
      // Since some database servers sometimes use a case-insensitive comparison
      // by default, double check that the filename is an exact match.
620
      if ($item->getFileUri() === $uri) {
621
622
623
624
        $file = $item;
        break;
      }
    }
625
  }
626
  if (!isset($file)) {
627
628
629
    return;
  }

630
  // Find out which (if any) fields of this type contain the file.
631
  $references = file_get_file_references($file, NULL, EntityStorageInterface::FIELD_LOAD_CURRENT, $field_type);
632

633
634
635
636
637
  // 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.
638
  if (empty($references) && ($file->isPermanent() || $file->getOwnerId() != $user->id())) {
639
    return;
640
641
  }

642
643
644
645
646
647
648
649
  // Default to allow access.
  $denied = FALSE;
  // Loop through all references of this file. If a reference explicitly allows
  // access to the field to which this file belongs, no further checks are done
  // and download access is granted. If a reference denies access, eventually
  // existing additional references are checked. If all references were checked
  // and no reference denied access, access is granted as well. If at least one
  // reference denied access, access is denied.
650
  foreach ($references as $field_name => $field_references) {
651
    foreach ($field_references as $entity_type => $entities) {
652
653
      $field_storage_definitions = \Drupal::entityManager()->getFieldStorageDefinitions($entity_type);
      $field = $field_storage_definitions[$field_name];
654
655
      foreach ($entities as $entity) {
        // Check if access to this field is not disallowed.
656
        if (!$entity->get($field_name)->access('view')) {
657
          $denied = TRUE;
658
          continue;
659
660
661
662
663
        }

        // Invoke hook and collect grants/denies for download access.
        // Default to FALSE and let entities overrule this ruling.
        $grants = array('system' => FALSE);
664
        foreach (\Drupal::moduleHandler()->getImplementations('file_download_access') as $module) {
665
          $grants = array_merge($grants, array($module => \Drupal::moduleHandler()->invoke($module, 'file_download_access', array($field, $entity, $file))));
666
667
        }
        // Allow other modules to alter the returned grants/denies.
668
669
670
671
672
        $context = array(
          'entity' => $entity,
          'field' => $field,
          'file' => $file,
        );
673
        \Drupal::moduleHandler()->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
707
708
709
710
711
712
713
714
715
716
717
  $age = \Drupal::config('system.file')->get('temporary_maximum_age');

  // Only delete temporary files if older than $age. Note that automatic cleanup
  // is disabled if $age set to 0.
  if ($age) {
    $fids = Drupal::entityQuery('file')
      ->condition('status', FILE_STATUS_PERMANENT, '<>')
      ->condition('changed', REQUEST_TIME - $age, '<')
      ->range(0, 100)
      ->execute();
    $files = file_load_multiple($fids);
    foreach ($files as $file) {
718
      $references = \Drupal::service('file.usage')->listUsage($file);
719
      if (empty($references)) {
720
        if (file_exists($file->getFileUri())) {
721
722
723
          $file->delete();
        }
        else {
724
          \Drupal::logger('file system')->error('Could not delete temporary file "%path" during garbage collection', array('%path' => $file->getFileUri()));
725
726
727
        }
      }
      else {
728
        \Drupal::logger('file system')->info('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))));
729
730
731
732
733
      }
    }
  }
}

734
735
736
737
/**
 * Saves file uploads to a new location.
 *
 * The files will be added to the {file_managed} table as temporary files.
738
739
 * Temporary files are periodically cleaned. Use the 'file.usage' service to
 * register the usage of the file which will automatically mark it as permanent.
740
741
742
743
 *
 * @param $form_field_name
 *   A string that is the associative array key of the upload form element in
 *   the form array.
744
745
 * @param array $form_state
 *   An associative array containing the current state of the form.
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
 * @param $validators
 *   An optional, associative array of callback functions used to validate the
 *   file. See file_validate() for a full discussion of the array format.
 *   If no extension validator is provided it will default to a limited safe
 *   list of extensions which is as follows: "jpg jpeg gif png txt
 *   doc xls pdf ppt pps odt ods odp". To allow all extensions you must
 *   explicitly set the 'file_validate_extensions' validator to an empty array
 *   (Beware: this is not safe and should only be allowed for trusted users, if
 *   at all).
 * @param $destination
 *   A string containing the URI that the file should be copied to. This must
 *   be a stream wrapper URI. If this value is omitted, Drupal's temporary
 *   files scheme will be used ("temporary://").
 * @param $delta
 *   Delta of the file to save or NULL to save all files. Defaults to NULL.
 * @param $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE: Replace the existing file.
 *   - FILE_EXISTS_RENAME: Append _{incrementing number} until the filename is
 *     unique.
 *   - FILE_EXISTS_ERROR: Do nothing and return FALSE.
 *
 * @return
 *   Function returns array of files or a single file object if $delta
 *   != NULL. Each file object contains the file information if the
 *   upload succeeded or FALSE in the event of an error. Function
 *   returns NULL if no file was uploaded.
 *
 *   The documentation for the "File interface" group, which you can find under
 *   Related topics, or the header at the top of this file, documents the
 *   components of a file entity. In addition to the standard components,
 *   this function adds:
 *   - source: Path to the file before it is moved.
 *   - destination: Path to the file after it is moved (same as 'uri').
 */
781
function file_save_upload($form_field_name, $validators = array(), $destination = FALSE, $delta = NULL, $replace = FILE_EXISTS_RENAME) {
782
  $user = \Drupal::currentUser();
783
784
  static $upload_cache;

785
  $file_upload = \Drupal::request()->files->get("files[$form_field_name]", NULL, TRUE);
786
  // Make sure there's an upload to process.
787
  if (empty($file_upload)) {
788
789
790
791
792
793
794
795
796
797
798
799
800
801
    return NULL;
  }

  // Return cached objects without processing since the file will have
  // already been processed and the paths in $_FILES will be invalid.
  if (isset($upload_cache[$form_field_name])) {
    if (isset($delta)) {
      return $upload_cache[$form_field_name][$delta];
    }
    return $upload_cache[$form_field_name];
  }

  // Prepare uploaded files info. Representation is slightly different
  // for multiple uploads and we fix that here.
802
803
804
  $uploaded_files = $file_upload;
  if (!is_array($file_upload)) {
    $uploaded_files = array($file_upload);
805
806
807
  }

  $files = array();
808
  foreach ($uploaded_files as $i => $file_info) {
809
810
811
    // Check for file upload errors and return FALSE for this file if a lower
    // level system error occurred. For a complete list of errors:
    // See http://php.net/manual/features.file-upload.errors.php.
812
    switch ($file_info->getError()) {
813
814
      case UPLOAD_ERR_INI_SIZE:
      case UPLOAD_ERR_FORM_SIZE:
815
        drupal_set_message(t('The file %file could not be saved because it exceeds %maxsize, the maximum allowed size for uploads.', array('%file' => $file_info->getFilename(), '%maxsize' => format_size(file_upload_max_size()))), 'error');
816
817
818
819
820
        $files[$i] = FALSE;
        continue;

      case UPLOAD_ERR_PARTIAL:
      case UPLOAD_ERR_NO_FILE:
821
        drupal_set_message(t('The file %file could not be saved because the upload did not complete.', array('%file' => $file_info->getFilename())), 'error');
822
823
824
825
826
827
        $files[$i] = FALSE;
        continue;

      case UPLOAD_ERR_OK:
        // Final check that this is a valid upload, if it isn't, use the
        // default error handler.
828
        if (is_uploaded_file($file_info->getRealPath())) {
829
830
831
832
833
          break;
        }

        // Unknown error
      default:
834
        drupal_set_message(t('The file %file could not be saved. An unknown error has occurred.', array('%file' => $file_info->getFilename())), 'error');
835
836
837
838
839
840
841
842
        $files[$i] = FALSE;
        continue;

    }
    // Begin building file entity.
    $values = array(
      'uid' => $user->id(),
      'status' => 0,
843
844
845
      'filename' => $file_info->getClientOriginalName(),
      'uri' => $file_info->getRealPath(),
      'filesize' => $file_info->getSize(),
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
    );
    $values['filemime'] = file_get_mimetype($values['filename']);
    $file = entity_create('file', $values);

    $extensions = '';
    if (isset($validators['file_validate_extensions'])) {
      if (isset($validators['file_validate_extensions'][0])) {
        // Build the list of non-munged extensions if the caller provided them.
        $extensions = $validators['file_validate_extensions'][0];
      }
      else {
        // If 'file_validate_extensions' is set and the list is empty then the
        // caller wants to allow any extension. In this case we have to remove the
        // validator or else it will reject all extensions.
        unset($validators['file_validate_extensions']);
      }
    }
    else {
      // No validator was provided, so add one using the default list.
      // Build a default non-munged safe list for file_munge_filename().
      $extensions = 'jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp';
      $validators['file_validate_extensions'] = array();
      $validators['file_validate_extensions'][0] = $extensions;
    }

    if (!empty($extensions)) {
      // Munge the filename to protect against possible malicious extension
      // hiding within an unknown file type (ie: filename.html.foo).
      $file->setFilename(file_munge_filename($file->getFilename(), $extensions));
    }

    // Rename potentially executable files, to help prevent exploits (i.e. will
    // rename filename.php.foo and filename.php to filename.php.foo.txt and
    // filename.php.txt, respectively). Don't rename if 'allow_insecure_uploads'
    // evaluates to TRUE.
881
    if (!\Drupal::config('system.file')->get('allow_insecure_uploads') && preg_match('/\.(php|pl|py|cgi|asp|js)(\.|$)/i', $file->getFilename()) && (substr($file->getFilename(), -4) != '.txt')) {
882
      $file->setMimeType('text/plain');
883
      // The destination filename will also later be used to create the URI.
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
      $file->setFilename($file->getFilename() . '.txt');
      // The .txt extension may not be in the allowed list of extensions. We have
      // to add it here or else the file upload will fail.
      if (!empty($extensions)) {
        $validators['file_validate_extensions'][0] .= ' txt';
        drupal_set_message(t('For security reasons, your upload has been renamed to %filename.', array('%filename' => $file->getFilename())));
      }
    }

    // If the destination is not provided, use the temporary directory.
    if (empty($destination)) {
      $destination = 'temporary://';
    }

    // Assert that the destination contains a valid stream.
    $destination_scheme = file_uri_scheme($destination);
    if (!file_stream_wrapper_valid_scheme($destination_scheme)) {
      drupal_set_message(t('The file could not be uploaded because the destination %destination is invalid.', array('%destination' => $destination)), 'error');
      $files[$i] = FALSE;
      continue;
    }

    $file->source = $form_field_name;
    // A file URI may already have a trailing slash or look like "public://".
    if (substr($destination, -1) != '/') {
      $destination .= '/';
    }
    $file->destination = file_destination($destination . $file->getFilename(), $replace);
    // If file_destination() returns FALSE then $replace === FILE_EXISTS_ERROR and
    // there's an existing file so we need to bail.
    if ($file->destination === FALSE) {
      drupal_set_message(t('The file %source could not be uploaded because a file by that name already exists in the destination %directory.', array('%source' => $form_field_name, '%directory' => $destination)), 'error');
      $files[$i] = FALSE;
      continue;
    }

    // Add in our check of the the file name length.
    $validators['file_validate_name_length'] = array();

    // Call the validation functions specified by this function's caller.
    $errors = file_validate($file, $validators);

    // Check for errors.
    if (!empty($errors)) {
      $message = t('The specified file %name could not be uploaded.', array('%name' => $file->getFilename()));
      if (count($errors) > 1) {
930
931
932
933
934
        $item_list = array(
          '#theme' => 'item_list',
          '#items' => $errors,
        );
        $message .= drupal_render($item_list);
935
936
937
938
      }
      else {
        $message .= ' ' . array_pop($errors);
      }
939
      drupal_set_message($message, 'error');
940
941
942
943
944
945
946
947
      $files[$i] = FALSE;
      continue;
    }

    // Move uploaded files from PHP's upload_tmp_dir to Drupal's temporary
    // directory. This overcomes open_basedir restrictions for future file
    // operations.
    $file->uri = $file->destination;
948
    if (!drupal_move_uploaded_file($file_info->getRealPath(), $file->getFileUri())) {
949
      drupal_set_message(t('File upload error. Could not move uploaded file.'), 'error');
950
      \Drupal::logger('file')->notice('Upload error. Could not move uploaded file %file to destination %destination.', array('%file' => $file->filename, '%destination' => $file->uri));
951
952
953
954
955
956
957
958
      $files[$i] = FALSE;
      continue;
    }

    // Set the permissions on the new file.
    drupal_chmod($file->getFileUri());

    // If we are replacing an existing file re-use its database record.
959
960
    // @todo Do not create a new entity in order to update it, see
    //   https://drupal.org/node/2241865
961
962
963
964
965
    if ($replace == FILE_EXISTS_REPLACE) {
      $existing_files = entity_load_multiple_by_properties('file', array('uri' => $file->getFileUri()));
      if (count($existing_files)) {
        $existing = reset($existing_files);
        $file->fid = $existing->id();
966
        $file->setOriginalId($existing->id());
967
968
969
970
971
972
973
974
975
976
977
978
979
980
      }
    }

    // If we made it this far it's safe to record this file in the database.
    $file->save();
    $files[$i] = $file;
  }

  // Add files to the cache.
  $upload_cache[$form_field_name] = $files;

  return isset($delta) ? $files[$delta] : $files;
}

981
/**
982
 * Determines the preferred upload progress implementation.
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
 *
 * @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;
}

/**
1006
 * Implements hook_ENTITY_TYPE_predelete() for file entities.
1007
 */
1008
function file_file_predelete(File $file) {
1009
1010
1011
  // TODO: Remove references to a file that is in-use.
}

1012
1013
1014
1015
/**
 * Implements hook_tokens().
 */
function file_tokens($type, $tokens, array $data = array(), array $options = array()) {
1016
  $token_service = \Drupal::token();
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030

  $url_options = array('absolute' => TRUE);
  if (isset($options['langcode'])) {
    $url_options['language'] = language_load($options['langcode']);
    $langcode = $options['langcode'];
  }
  else {
    $langcode = NULL;
  }
  $sanitize = !empty($options['sanitize']);

  $replacements = array();

  if ($type == 'file' && !empty($data['file'])) {
1031
    /** @var \Drupal\file\FileInterface $file */
1032
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1035
1036
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1038
1039
1040
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    $file = $data['file'];

    foreach ($tokens as $name => $original) {
      switch ($name) {
        // Basic keys and values.
        case 'fid':
          $replacements[$original] = $file->id();
          break;

        // Essential file data
        case 'name':
1043
          $replacements[$original] = $sanitize ? String::checkPlain($file->getFilename()) : $file->getFilename();
1044
1045
1046
          break;

        case 'path':
1047
          $replacements[$original] = $sanitize ? String::checkPlain($file->getFileUri()) : $file->getFileUri();
1048
1049
1050
          break;

        case 'mime':
1051
          $replacements[$original] = $sanitize ? String::checkPlain($file->getMimeType()) : $file->getMimeType();
1052
1053
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1058
          break;

        case 'size':
          $replacements[$original] = format_size($file->getSize());
          break;

        case 'url':
1059
          $replacements[$original] = $sanitize ? String::checkPlain(file_create_url($file->getFileUri())) : file_create_url($file->getFileUri());
1060
1061
1062
          break;

        // These tokens are default variations on the chained tokens handled below.
1063
1064
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1067
        case 'created':
          $replacements[$original] = format_date($file->getCreatedTime(), 'medium', '', NULL, $langcode);
          break;

        case 'changed':
1068
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          $replacements[$original] = format_date($file->getChangedTime(), 'medium', '', NULL, $langcode);
          break;

        case 'owner':
          $name = $file->getOwner()->label();
1073
          $replacements[$original] = $sanitize ? String::checkPlain($name) : $name;
1074
1075
1076
1077
          break;
      }
    }

1078
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    if ($date_tokens = $token_service->findWithPrefix($tokens, 'created')) {
      $replacements += $token_service->generate('date', $date_tokens, array('date' => $file->getCreatedTime()), $options);
    }

    if ($date_tokens = $token_service->findWithPrefix($tokens, 'changed')) {
1083
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1090
1091
1092
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1097
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1103
1104
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1108
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1110
1111
1112
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      $replacements += $token_service->generate('date', $date_tokens, array('date' => $file->getChangedTime()), $options);
    }

    if (($owner_tokens = $token_service->findWithPrefix($tokens, 'owner')) && $file->getOwner()) {
      $replacements += $token_service->generate('user', $owner_tokens, array('user' => $file->getOwner()), $options);
    }
  }

  return $replacements;
}

/**
 * Implements hook_token_info().
 */
function file_token_info() {
  $types['file'] = array(
    'name' => t("Files"),
    'description' => t("Tokens related to uploaded files."),
    'needs-data' => 'file',
  );

  // File related tokens.
  $file['fid'] = array(
    'name' => t("File ID"),
    'description' => t("The unique ID of the uploaded file."),
  );
  $file['name'] = array(
    'name' => t("File name"),
    'description' => t("The name of the file on disk."),
  );
  $file['path'] = array(
    'name' => t("Path"),
    'description' => t("The location of the file relative to Drupal root."),
  );
  $file['mime'] = array(
    'name' => t("MIME type"),
    'description' => t("The MIME type of the file."),
  );
  $file['size'] = array(
    'name' => t("File size"),
    'description' => t("The size of the file."),
  );
  $file['url'] = array(
    'name' => t("URL"),
    'description' => t("The web-accessible URL for the file."),
  );
1129
1130
1131
1132
1133
1134
1135
  $file['created'] = array(
    'name' => t("Created"),
    'description' => t("The date the file created."),
    'type' => 'date',
  );
  $file['changed'] = array(
    'name' => t("Changed"),
1136
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1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
    'description' => t("The date the file was most recently changed."),
    'type' => 'date',
  );
  $file['owner'] = array(
    'name' => t("Owner"),
    'description' => t("The user who originally uploaded the file."),
    'type' => 'user',
  );

  return array(
    'types' => $types,
    'tokens' => array(
      'file' => $file,
    ),
  );
}

1153
/**
1154
 * Render API callback: Expands the managed_file element type.
1155
1156
1157
 *
 * Expands the file type to include Upload and Remove buttons, as well as
 * support for a default value.
1158
1159
 *
 * This function is assigned as a #process callback in file_element_info().
1160
1161
 */
function file_managed_file_process($element, &$form_state, $form) {
1162
1163
1164
  // Append the '-upload' to the #id so the field label's 'for' attribute
  // corresponds with the file element.
  $element['#id'] .= '-upload';
1165
1166
1167
1168
1169

  // 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();
1170
1171
1172

  // Set some default element properties.
  $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
1173
  $element['#files'] = !empty($fids) ? file_load_multiple($fids) : FALSE;
1174
1175
1176
  $element['#tree'] = TRUE;

  $ajax_settings = array(
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1183
    'path' => 'file/ajax',
    'options' => array(
      'query' => array(
        'element_parents' => implode('/', $element['#array_parents']),
        'form_build_id' => $form['form_build_id']['#value'],
      ),
    ),
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1188
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    '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(
1194
    '#name' => $parents_prefix . '_upload_button',
1195
1196
    '#type' => 'submit',
    '#value' => t('Upload'),
1197
    '#attributes' => array('class' => array('js-hide')),
1198
1199
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
1200
    '#limit_validation_errors' => array($element['#parents']),
1201
1202
1203
1204
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

1205
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1207
  // 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';
1208
1209
1210
  $ajax_settings['progress']['message'] = NULL;
  $ajax_settings['effect'] = 'none';
  $element['remove_button'] = array(
1211
    '#name' => $parents_prefix . '_remove_button',
1212
    '#type' => 'submit',
1213
    '#value' => $element['#multiple'] ? t('Remove selected') : t('Remove'),
1214
1215
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
1216
    '#limit_validation_errors' => array($element['#parents']),
1217
    '#ajax' => $ajax_settings,
1218
    '#weight' => 1,
1219
1220
  );

1221
  $element['fids'] = array(
1222
    '#type' => 'hidden',
1223
    '#value' => $fids,
1224
1225
1226
1227
  );

  // Add progress bar support to the upload if possible.
  if ($element['#progress_indicator'] == 'bar' && $implementation = file_progress_implementation()) {
1228
    $upload_progress_key = mt_rand();
1229
1230
1231
1232
1233
1234

    if ($implementation == 'uploadprogress') {
      $element['UPLOAD_IDENTIFIER'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
1235
1236
1237
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
1238
1239
1240
1241
1242
1243
1244
      );
    }
    elseif ($implementation == 'apc') {
      $element['APC_UPLOAD_PROGRESS'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key</