file.module 76.1 KB
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<?php

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

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

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

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

  return $items;
}

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

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

/**
 * Loads a single file entity from the database.
 *
 * @param $fid
 *   A file ID.
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 * @param $reset
 *   Whether to reset the internal file_load_multiple() cache.
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 *
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 * @return \Drupal\file\FileInterface
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 *   A file entity or NULL if the file was not found.
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 *
 * @see hook_file_load()
 * @see file_load_multiple()
 */
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function file_load($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.
    module_invoke_all('file_copy', $file, $source);

    return $file;
  }
  return FALSE;
}

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

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

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

    $file->save();

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

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

    return $file;
  }
  return FALSE;
}

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

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

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

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

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

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

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

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  if ($file_limit && $file->getSize() > $file_limit) {
    $errors[] = t('The file is %filesize exceeding the maximum file size of %maxsize.', array('%filesize' => format_size($file->getSize()), '%maxsize' => format_size($file_limit)));
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  }
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  // Save a query by only calling spaceUsed() when a limit is provided.
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  if ($user_limit && (Drupal::entityManager()->getStorageController('file')->spaceUsed($user->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),
601 602 603 604 605
    ),
  );
}

/**
606
 * Implements hook_file_download().
607 608 609
 *
 * This function takes an extra parameter $field_type so that it may
 * be re-used by other File-like modules, such as Image.
610
 */
611
function file_file_download($uri, $field_type = 'file') {
612 613 614
  global $user;

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

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

633 634 635 636 637
  // Stop processing if there are no references in order to avoid returning
  // headers for files controlled by other modules. Make an exception for
  // temporary files where the host entity has not yet been saved (for example,
  // an image preview on a node/add form) in which case, allow download by the
  // file's owner.
638
  if (empty($references) && ($file->isPermanent() || $file->getOwner()->id() != $user->id())) {
639
    return;
640 641
  }

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

        // Invoke hook and collect grants/denies for download access.
        // Default to FALSE and let entities overrule this ruling.
        $grants = array('system' => FALSE);
663
        foreach (Drupal::moduleHandler()->getImplementations('file_download_access') as $module) {
664
          $grants = array_merge($grants, array($module => module_invoke($module, 'file_download_access', $field, $entity, $file)));
665 666
        }
        // Allow other modules to alter the returned grants/denies.
667 668 669 670 671 672
        $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;
686 687 688 689 690
        }
      }
    }
  }

691 692
  // Access specifically denied.
  if ($denied) {
693 694 695 696
    return -1;
  }

  // Access is granted.
697 698
  $headers = file_get_content_headers($file);
  return $headers;
699 700
}

701 702 703 704
/**
 * Implements file_cron()
 */
function file_cron() {
705
  $result = Drupal::entityManager()->getStorageController('file')->retrieveTemporaryFiles();
706 707
  foreach ($result as $row) {
    if ($file = file_load($row->fid)) {
708
      $references = file_usage()->listUsage($file);
709
      if (empty($references)) {
710
        if (file_exists($file->getFileUri())) {
711 712 713
          $file->delete();
        }
        else {
714
          watchdog('file system', 'Could not delete temporary file "%path" during garbage collection', array('%path' => $file->getFileUri()), WATCHDOG_ERROR);
715 716 717
        }
      }
      else {
718
        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);
719 720 721 722 723
      }
    }
  }
}

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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) {
        $message .= theme('item_list', array('items' => $errors));
      }
      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;
}

962
/**
963 964
 * Ajax callback: Processes file uploads and deletions.
 *
965 966 967 968
 * This rebuilds the form element for a particular field item. As long as the
 * form processing is properly encapsulated in the widget element the form
 * should rebuild correctly using FAPI without the need for additional callbacks
 * or processing.
969 970
 *
 * @see file_menu()
971 972 973 974 975
 */
function file_ajax_upload() {
  $form_parents = func_get_args();
  $form_build_id = (string) array_pop($form_parents);

976 977
  $request = \Drupal::request();
  if (!$request->request->has('form_build_id') || $form_build_id != $request->request->get('form_build_id')) {
978 979
    // Invalid request.
    drupal_set_message(t('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (@size) that this server supports.', array('@size' => format_size(file_upload_max_size()))), 'error');
980
    $response = new AjaxResponse();
981 982
    $status_messages = array('#theme' => 'status_messages');
    return $response->addCommand(new ReplaceCommand(NULL, drupal_render($status_messages)));
983 984
  }

985
  list($form, $form_state) = ajax_get_form();
986 987 988 989

  if (!$form) {
    // Invalid form_build_id.
    drupal_set_message(t('An unrecoverable error occurred. Use of this form has expired. Try reloading the page and submitting again.'), 'error');
990
    $response = new AjaxResponse();
991 992
    $status_messages = array('#theme' => 'status_messages');
    return $response->addCommand(new ReplaceCommand(NULL, drupal_render($status_messages)));
993 994 995 996 997 998 999 1000 1001
  }

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

1002 1003
  // Process user input. $form and $form_state are modified in the process.
  drupal_process_form($form['#form_id'], $form, $form_state);
1004 1005 1006 1007 1008 1009

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

1010
  // Add the special Ajax class if a new file was added.
1011 1012 1013 1014 1015 1016 1017 1018
  if (isset($form['#file_upload_delta']) && $current_file_count < $form['#file_upload_delta']) {
    $form[$current_file_count]['#attributes']['class'][] = 'ajax-new-content';
  }
  // Otherwise just add the new content class on a placeholder.
  else {
    $form['#suffix'] .= '<span class="ajax-new-content"></span>';
  }

1019 1020
  $status_messages = array('#theme' => 'status_messages');
  $form['#prefix'] .= drupal_render($status_messages);
1021
  $output = drupal_render($form);
1022
  $js = drupal_add_js();
1023
  $settings = drupal_merge_js_settings($js['settings']['data']);
1024

1025 1026
  $response = new AjaxResponse();
  return $response->addCommand(new ReplaceCommand(NULL, $output, $settings));
1027 1028 1029
}

/**
1030 1031
 * Ajax callback: Retrieves upload progress.
 *
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
 * @param $key
 *   The unique key for this upload process.
 */
function file_ajax_progress($key) {
  $progress = array(
    'message' => t('Starting upload...'),
    'percentage' => -1,
  );

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

1057
  return new JsonResponse($progress);
1058 1059 1060
}

/**
1061
 * Determines the preferred upload progress implementation.
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
 *
 * @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;
}

/**
1085
 * Implements hook_file_predelete().
1086
 */
1087
function file_file_predelete(File $file) {
1088 1089 1090
  // TODO: Remove references to a file that is in-use.
}

1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217
/**
 * 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,
    ),
  );
}

1218
/**
1219
 * Render API callback: Expands the managed_file element type.
1220 1221 1222
 *
 * Expands the file type to include Upload and Remove buttons, as well as
 * support for a default value.
1223 1224
 *
 * This function is assigned as a #process callback in file_element_info().
1225 1226
 */
function file_managed_file_process($element, &$form_state, $form) {
1227 1228 1229
  // Append the '-upload' to the #id so the field label's 'for' attribute
  // corresponds with the file element.
  $element['#id'] .= '-upload';
1230 1231 1232 1233 1234

  // 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();
1235 1236 1237

  // Set some default element properties.
  $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
1238
  $element['#files'] = !empty($fids) ? file_load_multiple($fids) : FALSE;
1239 1240 1241
  $element['#tree'] = TRUE;

  $ajax_settings = array(
1242
    'path' => 'file/ajax/' . implode('/', $element['#array_parents']) . '/' . $form['form_build_id']['#value'],
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252
    '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(
1253
    '#name' => $parents_prefix . '_upload_button',
1254 1255 1256 1257
    '#type' => 'submit',
    '#value' => t('Upload'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
1258
    '#limit_validation_errors' => array($element['#parents']),
1259 1260 1261 1262
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

1263 1264 1265
  // 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';
1266 1267 1268
  $ajax_settings['progress']['message'] = NULL;
  $ajax_settings['effect'] = 'none';
  $element['remove_button'] = array(
1269
    '#name' => $parents_prefix . '_remove_button',
1270
    '#type' => 'submit',
1271
    '#value' => $element['#multiple'] ? t('Remove selected') : t('Remove'),
1272 1273
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
1274
    '#limit_validation_errors' => array($element['#parents']),
1275
    '#ajax' => $ajax_settings,
1276
    '#weight' => 1,
1277 1278
  );

1279
  $element['fids'] = array(