file.module 72.5 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\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\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() {
  $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) {
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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()->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;
}

/**
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 * Checks that the file is recognized by Image::getInfo() as an image.
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 *
 * @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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  $image = Drupal::service('image.factory')->get($file->getFileUri());
  if (!$image->getExtension()) {
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    $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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  $image_factory = Drupal::service('image.factory');
  $image = $image_factory->get($file->getFileUri());
  if ($image->getExtension()) {
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    if ($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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        $image = $image_factory->get($file->getFileUri());
        if ($image->getResource()) {
          $image->scale($width, $height);
          $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 {
          $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', $minimum_dimensions);
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      if ($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 $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
 *       the destination name exists then its database entry will be updated. If
 *       no database entry is found then a new one will be created.
 *   - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
 *       unique.
 *   - FILE_EXISTS_ERROR - Do nothing and return FALSE.
 *
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 * @return \Drupal\file\FileInterface
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 *   A file entity, or FALSE on error.
 *
 * @see file_unmanaged_save_data()
 */
function file_save_data($data, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
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  $user = Drupal::currentUser();
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  if (empty($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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  $type = mime_header_encode($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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    ),
  );
}

/**
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 * Implements hook_file_download().
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 *
 * This function takes an extra parameter $field_type so that it may
 * be re-used by other File-like modules, such as Image.
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 */
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function file_file_download($uri, $field_type = 'file') {
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  $user = Drupal::currentUser();
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  // Get the file record based on the URI. If not in the database just return.
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  $files = entity_load_multiple_by_properties('file', array('uri' => $uri));
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  if (count($files)) {
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    foreach ($files as $item) {
      // Since some database servers sometimes use a case-insensitive comparison
      // by default, double check that the filename is an exact match.
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      if ($item->getFileUri() === $uri) {
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        $file = $item;
        break;
      }
    }
623
  }
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  if (!isset($file)) {
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    return;
  }

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  // Find out which (if any) fields of this type contain the file.
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  $references = file_get_file_references($file, NULL, FIELD_LOAD_CURRENT, $field_type);
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  // Stop processing if there are no references in order to avoid returning
  // headers for files controlled by other modules. Make an exception for
  // temporary files where the host entity has not yet been saved (for example,
  // an image preview on a node/add form) in which case, allow download by the
  // file's owner.
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  if (empty($references) && ($file->isPermanent() || $file->getOwner()->id() != $user->id())) {
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    return;
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  }

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  // Default to allow access.
  $denied = FALSE;
  // Loop through all references of this file. If a reference explicitly allows
  // access to the field to which this file belongs, no further checks are done
  // and download access is granted. If a reference denies access, eventually
  // existing additional references are checked. If all references were checked
  // and no reference denied access, access is granted as well. If at least one
  // reference denied access, access is denied.
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  foreach ($references as $field_name => $field_references) {
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    foreach ($field_references as $entity_type => $entities) {
      foreach ($entities as $entity) {
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        $field = field_info_field($entity_type, $field_name);
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        // Check if access to this field is not disallowed.
        if (!field_access('view', $field, $entity_type, $entity)) {
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          $denied = TRUE;
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          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);
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        foreach (Drupal::moduleHandler()->getImplementations('file_download_access') as $module) {
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          $grants = array_merge($grants, array($module => module_invoke($module, 'file_download_access', $field, $entity, $file)));
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        }
        // 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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        }
      }
    }
  }

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

  // Access is granted.
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  $headers = file_get_content_headers($file);
  return $headers;
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}

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/**
 * Implements file_cron()
 */
function file_cron() {
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  $result = Drupal::entityManager()->getStorageController('file')->retrieveTemporaryFiles();
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  foreach ($result as $row) {
    if ($file = file_load($row->fid)) {
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      $references = file_usage()->listUsage($file);
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      if (empty($references)) {
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        if (file_exists($file->getFileUri())) {
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          $file->delete();
        }
        else {
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          watchdog('file system', 'Could not delete temporary file "%path" during garbage collection', array('%path' => $file->getFileUri()), WATCHDOG_ERROR);
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        }
      }
      else {
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        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) {
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  $user = Drupal::currentUser();
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  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.
867
    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')) {
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      $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) {
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        $item_list = array(
          '#theme' => 'item_list',
          '#items' => $errors,
        );
        $message .= drupal_render($item_list);
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      }
      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.
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 *
 * @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) {
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  // 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)))
      )
    );
1262
1263
  }

1264
  // Prefix and suffix used for Ajax replacement.
1265
1266
1267
1268
1269
1270
1271
  $element['#prefix'] = '<div id="' . $element['#id'] . '-ajax-wrapper">';
  $element['#suffix'] = '</div>';

  return $element;
}

/**
1272
1273
1274
 * Render API callback: Determines the value for a managed_file type element.
 *
 * This function is assigned as a #value_callback in file_element_info().
1275
1276
 */
function file_managed_file_value(&$element, $input = FALSE, $form_state = NULL) {
1277
1278
1279
1280
  // Find the current value of this field.
  $fids = !empty($input['fids']) ? explode(' ', $input['fids']) : array();
  foreach ($fids as $key => $fid) {
    $fids[$key] = (int) $fid;
1281
1282
1283
1284
  }

  // Process any input and save new uploads.
  if ($input !== FALSE) {
1285
    $input['fids'] = $fids;
1286
1287
1288
    $return = $input;

    // Uploads take priority over all other values.
1289
1290
1291
1292
1293
1294
1295
    if ($files = file_managed_file_save_upload($element)) {
      if ($element['#multiple']) {
        $fids = array_merge($fids, array_keys($files));
      }
      else {
        $fids = array_keys($files);
      }
1296
1297
1298
1299
1300
1301
1302
1303
    }
    else {
      // Check for #filefield_value_callback values.
      // Because FAPI does not allow multiple #value_callback values like it
      // does for #element_validate and #process, this fills the missing
      // functionality to allow File fields to be extended through FAPI.
      if (isset($element['#file_value_callbacks'])) {
        foreach ($element['#file_value_callbacks'] as $callback) {
1304
          $callback($element, $input, $form_state);
1305
1306
        }
      }
1307
1308
1309
1310

      // Load files if the FIDs have changed to confirm they exist.
      if (!empty($input['fids'])) {
        $fids = array();
1311
        foreach ($input['fids'] as $fid) {
1312
          if ($file = file_load($fid)) {
1313
            $fids[] = $file->id();
1314
1315
          }
        }
1316
1317
1318
1319
1320
1321
1322
      }
    }
  }

  // If there is no input, set the default value.
  else {
    if ($element['#extended']) {
1323
1324
      $default_fids = isset($element['#default_value']['fids']) ? $element['#default_value']['fids'] : array();
      $return = isset($element['#default_value']) ? $element['#default_value'] : array('fids' => array());
1325
1326
    }
    else {
1327
1328
      $default_fids = isset($element['#default_value']) ? $element['#default_value'] : array();
      $return = array('fids' => array());
1329
1330
1331
    }

    // Confirm that the file exists when used as a default value.
1332
1333
    if (!empty($default_fids)) {
      $fids = array();
1334
      foreach ($default_fids as $fid) {
1335
        if ($file = file_load($fid)) {
1336
          $fids[] = $file->id();
1337
1338
        }
      }
1339
1340
1341
    }
  }

1342
  $return['fids'] = $fids;
1343
1344
1345
1346
  return $return;
}

/**
1347
1348
1349
1350
 * Render API callback: Validates the managed_file element.
 *
 * This function is assigned as a #element_validate callback in
 * file_element_info().
1351
1352
1353
1354
1355
 */
function file_managed_file_validate(&$element, &$form_state) {
  // If referencing an existing file, only allow if there are existing
  // references. This prevents unmanaged files from being deleted if this
  // item were to be deleted.
1356
  $clicked_button = end($form_state['triggering_element']['#parents']);
1357
1358
1359
1360
  if ($clicked_button != 'remove_button' && !empty($element['fids']['#value'])) {
    $fids = $element['fids']['#value'];
    foreach ($fids as $fid) {
      if ($file = file_load($fid)) {
1361
        if ($file->isPermanent()) {
1362
1363
1364
1365
          $references = file_usage()->listUsage($file);
          if (empty($references)) {
            form_error($element, t('The file used in the !name field may not be referenced.', array('!name' => $element['#title'])));
          }
1366
1367
        }
      }
1368
1369
1370
      else {
        form_error($element, t('The file referenced by the !name field does not exist.', array('!name' => $element['#title'])));
      }
1371
1372
1373
1374
    }
  }

  // Check required property based on the FID.
1375
  if ($element['#required'] && empty($element['fids']['#value']) && !in_array($clicked_button, array('upload_button', 'remove_button'))) {
1376
1377
1378
    form_error($element['upload'], t('!name field is required.', array('!name' => $element['#title'])));
  }

1379
  // Consolidate the array value of this field to array of FIDs.
1380
  if (!$element['#extended']) {
1381
    form_set_value($element, $element['fids']['#value'], $form_state);
1382
1383
1384
1385
  }
}

/**
1386
1387
1388
 * Form submission handler for upload / remove buttons of managed_file elements.
 *
 * @see file_managed_file_process()
1389
1390
 */
function file_managed_file_submit($form, &$form_state) {
1391
1392
1393
1394
  // Determine whether it was the upload or the remove button that was clicked,
  // and set $element to the managed_file element that contains that button.
  $parents = $form_state['triggering_element']['#array_parents'];
  $button_key = array_pop($parents);
1395
  $element = NestedArray::getValue($form, $parents);
1396
1397
1398
1399
1400
1401

  // No action is needed here for the upload button, because all file uploads on
  // the form are processed by file_managed_file_value() regardless of which
  // button was clicked. Action is needed here for the remove button, because we
  // only remove a file in response to its remove button being clicked.
  if ($button_key == 'remove_button') {
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
    $fids = array_keys($element['#files']);
    // Get files that will be removed.
    if ($element['#multiple']) {
      $remove_fids = array();
      foreach (element_children($element) as $name) {
        if (strpos($name, 'file_') === 0 && $element[$name]['selected']['#value']) {
          $remove_fids[] = (int) substr($name, 5);
        }
      }
      $fids = array_diff($fids, $remove_fids);
    }
    else {
1414
1415
1416
      // If we deal with single upload element remove the file and set
      // element's value to empty array (file could not be removed from
      // element if we don't do that).
1417
      $remove_fids = $fids;
1418
      $fids = array();
1419
1420
1421
1422
1423
1424
    }

    foreach ($remove_fids as $fid) {
      // If it's a temporary file we can safely remove it immediately, otherwise
      // it's up to the implementing module to remove usages of files to have them
      // removed.
1425
1426
      if ($element['#files'][$fid] && $element['#files'][$fid]->isTemporary()) {
        $element['#files'][$fid]->delete();
1427
      }
1428
1429
1430
1431
1432
1433
1434
    }
    // Update both $form_state['values'] and $form_state['input'] to reflect
    // that the file has been removed, so that the form is rebuilt correctly.
    // $form_state['values'] must be updated in case additional submit handlers
    // run, and for form building functions that run during the rebuild, such as
    // when the managed_file element is part of a field widget.
    // $form_state['input'] must be updated so that file_managed_file_value()
1435
    // has correct information during the rebuild.
1436
1437
    form_set_value($element['fids'], implode(' ', $fids), $form_state);
    NestedArray::setValue($form_state['input'], $element['fids']['#parents'], implode(' ', $fids));
1438
1439
1440
1441
1442
1443
1444
1445
1446
  }

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