file.module 72.4 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(
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    'route_name' => 'file.ajax.upload',
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    'theme callback' => 'ajax_base_page_theme',
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    'type' => MENU_CALLBACK,
  );
  $items['file/progress'] = array(
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    'route name' => 'file.ajax.progress',
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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 $reset
 *   Whether to reset the internal file_load_multiple() cache.
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 *
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 * @return \Drupal\file\FileInterface
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 *   A file entity or NULL if the file was not found.
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 *
 * @see hook_file_load()
 * @see file_load_multiple()
 */
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function file_load($fid, $reset = FALSE) {
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  return entity_load('file', $fid, $reset);
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}

/**
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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() {
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  return Drupal::service('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.
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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.
 *
 * @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.
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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 && !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.
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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.
 *
 * @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->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;
}

/**
 * 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,
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      'uid' => $user->id(),
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      'status' => FILE_STATUS_PERMANENT,
    ));
    // If we are replacing an existing file re-use its database record.
    if ($replace == FILE_EXISTS_REPLACE) {
      $existing_files = entity_load_multiple_by_properties('file', array('uri' => $uri));
      if (count($existing_files)) {
        $existing = reset($existing_files);
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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();
    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) {
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  $name = mime_header_encode($file->getFilename());
  $type = mime_header_encode($file->getMimeType());
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  return array(
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    'Content-Type' => $type,
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    'Content-Length' => $file->getSize(),
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    'Cache-Control' => 'private',
  );
}

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/**
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 * Implements hook_theme().
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 */
function file_theme() {
  return array(
    // file.module.
    'file_link' => array(
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      'variables' => array('file' => NULL, 'icon_directory' => NULL, 'description' => NULL),
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    ),
    'file_icon' => array(
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      'variables' => array('file' => NULL, 'icon_directory' => NULL),
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    ),
    'file_managed_file' => array(
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      'render element' => 'element',
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    ),

    // file.field.inc.
    'file_widget' => array(
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      'render element' => 'element',
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    ),
    'file_widget_multiple' => array(
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      'render element' => 'element',
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    ),
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    'file_formatter_table' => array(
      'variables' => array('items' => NULL),
    ),
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    'file_upload_help' => array(
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      'variables' => array('description' => NULL, 'upload_validators' => NULL, 'cardinality' => NULL),
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    ),
  );
}

/**
604
 * Implements hook_file_download().
605 606 607
 *
 * This function takes an extra parameter $field_type so that it may
 * be re-used by other File-like modules, such as Image.
608
 */
609
function file_file_download($uri, $field_type = 'file') {
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  global $user;

  // Get the file record based on the URI. If not in the database just return.
613
  $files = entity_load_multiple_by_properties('file', array('uri' => $uri));
614
  if (count($files)) {
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    foreach ($files as $item) {
      // Since some database servers sometimes use a case-insensitive comparison
      // by default, double check that the filename is an exact match.
618
      if ($item->getFileUri() === $uri) {
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        $file = $item;
        break;
      }
    }
623
  }
624
  if (!isset($file)) {
625 626 627
    return;
  }

628
  // Find out which (if any) fields of this type contain the file.
629
  $references = file_get_file_references($file, NULL, FIELD_LOAD_CURRENT, $field_type);
630

631 632 633 634 635
  // 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.
636
  if (empty($references) && ($file->isPermanent() || $file->getOwner()->id() != $user->id())) {
637
    return;
638 639
  }

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

        // Invoke hook and collect grants/denies for download access.
        // Default to FALSE and let entities overrule this ruling.
        $grants = array('system' => FALSE);
661
        foreach (Drupal::moduleHandler()->getImplementations('file_download_access') as $module) {
662
          $grants = array_merge($grants, array($module => module_invoke($module, 'file_download_access', $field, $entity, $file)));
663 664
        }
        // Allow other modules to alter the returned grants/denies.
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        $context = array(
          'entity' => $entity,
          'field' => $field,
          'file' => $file,
        );
        drupal_alter('file_download_access', $grants, $context);
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        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;
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        }
      }
    }
  }

689 690
  // Access specifically denied.
  if ($denied) {
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    return -1;
  }

  // Access is granted.
695 696
  $headers = file_get_content_headers($file);
  return $headers;
697 698
}

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/**
 * Implements file_cron()
 */
function file_cron() {
703
  $result = Drupal::entityManager()->getStorageController('file')->retrieveTemporaryFiles();
704 705
  foreach ($result as $row) {
    if ($file = file_load($row->fid)) {
706
      $references = file_usage()->listUsage($file);
707
      if (empty($references)) {
708
        if (file_exists($file->getFileUri())) {
709 710 711
          $file->delete();
        }
        else {
712
          watchdog('file system', 'Could not delete temporary file "%path" during garbage collection', array('%path' => $file->getFileUri()), WATCHDOG_ERROR);
713 714 715
        }
      }
      else {
716
        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);
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      }
    }
  }
}

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/**
 * Saves file uploads to a new location.
 *
 * The files will be added to the {file_managed} table as temporary files.
 * Temporary files are periodically cleaned. Use file_usage()->add() to register
 * the usage of the file which will automatically mark it as permanent.
 *
 * @param $form_field_name
 *   A string that is the associative array key of the upload form element in
 *   the form array.
 * @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 $delta
 *   != NULL. Each file object contains the file information if the
 *   upload succeeded or FALSE in the event of an error. Function
 *   returns NULL if no file was uploaded.
 *
 *   The documentation for the "File interface" group, which you can find under
 *   Related topics, or the header at the top of this file, documents the
 *   components of a file entity. In addition to the standard components,
 *   this function adds:
 *   - source: Path to the file before it is moved.
 *   - destination: Path to the file after it is moved (same as 'uri').
 */
function file_save_upload($form_field_name, $validators = array(), $destination = FALSE, $delta = NULL, $replace = FILE_EXISTS_RENAME) {
  global $user;
  static $upload_cache;

  // Make sure there's an upload to process.
  if (empty($_FILES['files']['name'][$form_field_name])) {
    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.
  $uploaded_files = $_FILES;
  if (!is_array($uploaded_files['files']['name'][$form_field_name])) {
    foreach (array('name', 'type', 'tmp_name', 'error', 'size') as $value)
    $uploaded_files['files'][$value][$form_field_name] = array($uploaded_files['files'][$value][$form_field_name]);
  }

  $files = array();
  foreach ($uploaded_files['files']['name'][$form_field_name] as $i => $name) {
    // Check for file upload errors and return FALSE for this file if a lower
    // level system error occurred. For a complete list of errors:
    // See http://php.net/manual/features.file-upload.errors.php.
    switch ($uploaded_files['files']['error'][$form_field_name][$i]) {
      case UPLOAD_ERR_INI_SIZE:
      case UPLOAD_ERR_FORM_SIZE:
        drupal_set_message(t('The file %file could not be saved because it exceeds %maxsize, the maximum allowed size for uploads.', array('%file' => $name, '%maxsize' => format_size(file_upload_max_size()))), 'error');
        $files[$i] = FALSE;
        continue;

      case UPLOAD_ERR_PARTIAL:
      case UPLOAD_ERR_NO_FILE:
        drupal_set_message(t('The file %file could not be saved because the upload did not complete.', array('%file' => $name)), 'error');
        $files[$i] = FALSE;
        continue;

      case UPLOAD_ERR_OK:
        // Final check that this is a valid upload, if it isn't, use the
        // default error handler.
        if (is_uploaded_file($uploaded_files['files']['tmp_name'][$form_field_name][$i])) {
          break;
        }

        // Unknown error
      default:
        drupal_set_message(t('The file %file could not be saved. An unknown error has occurred.', array('%file' => $name)), 'error');
        $files[$i] = FALSE;
        continue;

    }
    // Begin building file entity.
    $values = array(
      'uid' => $user->id(),
      'status' => 0,
      'filename' => trim(drupal_basename($name, '.')),
      'uri' => $uploaded_files['files']['tmp_name'][$form_field_name][$i],
      'filesize' => $uploaded_files['files']['size'][$form_field_name][$i],
    );
    $values['filemime'] = file_get_mimetype($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.
    if (!config('system.file')->get('allow_insecure_uploads') && preg_match('/\.(php|pl|py|cgi|asp|js)(\.|$)/i', $file->getFilename()) && (substr($file->getFilename(), -4) != '.txt')) {
      $file->setMimeType('text/plain');
      $file->setFileUri($file->getFileUri() . '.txt');
      $file->setFilename($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) {
916 917 918 919 920
        $item_list = array(
          '#theme' => 'item_list',
          '#items' => $errors,
        );
        $message .= drupal_render($item_list);
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
      }
      else {
        $message .= ' ' . array_pop($errors);
      }
      form_set_error($form_field_name, $message);
      $files[$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 = $file->destination;
    if (!drupal_move_uploaded_file($uploaded_files['files']['tmp_name'][$form_field_name][$i], $file->getFileUri())) {
      form_set_error($form_field_name, t('File upload error. Could not move uploaded file.'));
      watchdog('file', 'Upload error. Could not move uploaded file %file to destination %destination.', array('%file' => $file->filename, '%destination' => $file->uri));
      $files[$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.
    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();
      }
    }

    // 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;
}

964
/**
965
 * Determines the preferred upload progress implementation.
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
 *
 * @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;
}

/**
989
 * Implements hook_file_predelete().
990
 */
991
function file_file_predelete(File $file) {
992 993 994
  // TODO: Remove references to a file that is in-use.
}

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/**
 * Implements hook_tokens().
 */
function file_tokens($type, $tokens, array $data = array(), array $options = array()) {
  $token_service = Drupal::token();

  $url_options = array('absolute' => TRUE);
  if (isset($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'])) {
    $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':
          $replacements[$original] = $sanitize ? check_plain($file->getFilename()) : $file->getFilename();
          break;

        case 'path':
          $replacements[$original] = $sanitize ? check_plain($file->getFileUri()) : $file->getFileUri();
          break;

        case 'mime':
          $replacements[$original] = $sanitize ? check_plain($file->getMimeType()) : $file->getMimeType();
          break;

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

        case 'url':
          $replacements[$original] = $sanitize ? check_plain(file_create_url($file->getFileUri())) : file_create_url($file->getFileUri());
          break;

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

        case 'owner':
          $name = $file->getOwner()->label();
          $replacements[$original] = $sanitize ? check_plain($name) : $name;
          break;
      }
    }

    if ($date_tokens = $token_service->findWithPrefix($tokens, 'timestamp')) {
      $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."),
  );
  $file['timestamp'] = array(
    'name' => t("Timestamp"),
    '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,
    ),
  );
}

1122
/**
1123
 * Render API callback: Expands the managed_file element type.
1124 1125 1126
 *
 * Expands the file type to include Upload and Remove buttons, as well as
 * support for a default value.
1127 1128
 *
 * This function is assigned as a #process callback in file_element_info().
1129 1130
 */
function file_managed_file_process($element, &$form_state, $form) {
1131 1132 1133
  // Append the '-upload' to the #id so the field label's 'for' attribute
  // corresponds with the file element.
  $element['#id'] .= '-upload';
1134 1135 1136 1137 1138

  // 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();
1139 1140 1141

  // Set some default element properties.
  $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
1142
  $element['#files'] = !empty($fids) ? file_load_multiple($fids) : FALSE;
1143 1144 1145
  $element['#tree'] = TRUE;

  $ajax_settings = array(
1146 1147 1148 1149 1150 1151 1152
    'path' => 'file/ajax',
    'options' => array(
      'query' => array(
        'element_parents' => implode('/', $element['#array_parents']),
        'form_build_id' => $form['form_build_id']['#value'],
      ),
    ),
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
    '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(
1163
    '#name' => $parents_prefix . '_upload_button',
1164 1165 1166 1167
    '#type' => 'submit',
    '#value' => t('Upload'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
1168
    '#limit_validation_errors' => array($element['#parents']),
1169 1170 1171 1172
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

1173 1174 1175
  // 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';
1176 1177 1178
  $ajax_settings['progress']['message'] = NULL;
  $ajax_settings['effect'] = 'none';
  $element['remove_button'] = array(
1179
    '#name' => $parents_prefix . '_remove_button',
1180
    '#type' => 'submit',
1181
    '#value' => $element['#multiple'] ? t('Remove selected') : t('Remove'),
1182 1183
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
1184
    '#limit_validation_errors' => array($element['#parents']),
1185
    '#ajax' => $ajax_settings,
1186
    '#weight' => 1,
1187 1188
  );

1189
  $element['fids'] = array(
1190
    '#type' => 'hidden',
1191
    '#value' => $fids,
1192 1193 1194 1195
  );

  // Add progress bar support to the upload if possible.
  if ($element['#progress_indicator'] == 'bar' && $implementation = file_progress_implementation()) {
1196
    $upload_progress_key = mt_rand();
1197 1198 1199 1200 1201 1202

    if ($implementation == 'uploadprogress') {
      $element['UPLOAD_IDENTIFIER'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
1203 1204 1205
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
1206 1207 1208 1209 1210 1211 1212
      );
    }
    elseif ($implementation == 'apc') {
      $element['APC_UPLOAD_PROGRESS'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
1213 1214 1215
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
1216 1217 1218 1219 1220 1221 1222 1223 1224
      );
    }

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

  // The file upload field itself.
  $element['upload'] = array(
1225
    '#name' => 'files[' . $parents_prefix . ']',
1226
    '#type' => 'file',
1227 1228
    '#title' => t('Choose a file'),
    '#title_display' => 'invisible',
1229
    '#size' => $element['#size'],
1230
    '#multiple' => $element['#multiple'],
1231 1232 1233 1234
    '#theme_wrappers' => array(),
    '#weight' => -10,
  );

1235 1236
  if (!empty($fids) && $element['#files']) {
    foreach ($element['#files'] as $delta => $file) {
1237 1238 1239 1240
      $file_link = array(
        '#theme' => 'file_link',
        '#file' => $file,
      );
1241 1242 1243
      if ($element['#multiple']) {
        $element['file_' . $delta]['selected'] = array(
          '#type' => 'checkbox',
1244
          '#title' => drupal_render($file_link),
1245 1246 1247
        );
      }
      else {
1248
        $element['file_' . $delta]['filename'] = $file_link += array('#weight' => -10);
1249 1250
      }
    }
1251 1252
  }

1253
  // Add the extension list to the page as JavaScript settings.
1254
  if (isset($element['#upload_validators']['file_validate_extensions'][0])) {
1255 1256 1257 1258 1259 1260 1261
    $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)))
      )
    );