file.module 58.6 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 DRUPAL_ROOT . '/core/modules/file/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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    '#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.
 *
 * @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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 */
function file_load_multiple(array $fids = NULL) {
  return entity_load_multiple('file', $fids);
}

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

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

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

  if ($uri = file_unmanaged_copy($source->uri, $destination, $replace)) {
    $file = clone $source;
    $file->fid = NULL;
    $file->uri = $uri;
    $file->filename = drupal_basename($uri);
    // 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);
        $file->fid = $existing->fid;
        $file->filename = $existing->filename;
      }
    }
    // If we are renaming around an existing file (rather than a directory),
    // use its basename for the filename.
    elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
      $file->filename = drupal_basename($destination);
    }

    $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)) {
    if (($realpath = drupal_realpath($source->uri)) !== 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->uri, '%realpath' => $realpath, '%destination' => $destination));
    }
    else {
      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->uri, '%destination' => $destination));
    }
    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->uri)), 'error');
    return FALSE;
  }

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

    $file = clone $source;
    $file->uri = $uri;
    // If we are replacing an existing file re-use its database record.
    if ($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;
        $file->fid = $existing->fid;
      }
    }
    // If we are renaming around an existing file (rather than a directory),
    // use its basename for the filename.
    elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
      $file->filename = drupal_basename($destination);
    }

    $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();

  if (empty($file->filename)) {
    $errors[] = t("The file's name is empty. Please give a name to the file.");
  }
  if (strlen($file->filename) > 240) {
    $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)) . ')$/i';
  if (!preg_match($regex, $file->filename)) {
    $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.
 *
 * This check is not enforced for the user #1.
 *
 * @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->filesize > $file_limit) {
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    $errors[] = t('The file is %filesize exceeding the maximum file size of %maxsize.', array('%filesize' => format_size($file->filesize), '%maxsize' => format_size($file_limit)));
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  }
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  // Save a query by only calling spaceUsed() when a limit is provided.
  if ($user_limit && (entity_get_controller('file')->spaceUsed($user->uid) + $file->filesize) > $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->filesize), '%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();

  $info = image_get_info($file->uri);
  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.
  if ($info = image_get_info($file->uri)) {
    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'] > $height) {
        // Try to resize the image to fit the dimensions.
        if ($image = image_load($file->uri)) {
          image_scale($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 $replace
 *   Replace behavior when the destination file already exists:
 *   - FILE_EXISTS_REPLACE - Replace the existing file. If a managed file with
 *       the destination name exists then its database entry will be updated. If
 *       no database entry is found then a new one will be created.
 *   - FILE_EXISTS_RENAME - Append _{incrementing number} until the filename is
 *       unique.
 *   - FILE_EXISTS_ERROR - Do nothing and return FALSE.
 *
 * @return Drupal\file\File
 *   A file entity, or FALSE on error.
 *
 * @see file_unmanaged_save_data()
 */
function file_save_data($data, $destination = NULL, $replace = FILE_EXISTS_RENAME) {
  global $user;

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

  if ($uri = file_unmanaged_save_data($data, $destination, $replace)) {
    // Create a file entity.
    $file = entity_create('file', array(
      'uri' => $uri,
      'uid' => $user->uid,
      'status' => FILE_STATUS_PERMANENT,
    ));
    // If we are replacing an existing file re-use its database record.
    if ($replace == FILE_EXISTS_REPLACE) {
      $existing_files = entity_load_multiple_by_properties('file', array('uri' => $uri));
      if (count($existing_files)) {
        $existing = reset($existing_files);
        $file->fid = $existing->fid;
        $file->filename = $existing->filename;
      }
    }
    // If we are renaming around an existing file (rather than a directory),
    // use its basename for the filename.
    elseif ($replace == FILE_EXISTS_RENAME && is_file($destination)) {
      $file->filename = drupal_basename($destination);
    }

    $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) {
  $name = mime_header_encode($file->filename);
  $type = mime_header_encode($file->filemime);

  return array(
566
    'Content-Type' => $type,
567
568
569
570
571
    'Content-Length' => $file->filesize,
    'Cache-Control' => 'private',
  );
}

572
/**
573
 * Implements hook_theme().
574
575
576
577
578
 */
function file_theme() {
  return array(
    // file.module.
    'file_link' => array(
579
      'variables' => array('file' => NULL, 'icon_directory' => NULL),
580
581
    ),
    'file_icon' => array(
582
      'variables' => array('file' => NULL, 'icon_directory' => NULL),
583
584
    ),
    'file_managed_file' => array(
585
      'render element' => 'element',
586
587
588
589
    ),

    // file.field.inc.
    'file_widget' => array(
590
      'render element' => 'element',
591
592
    ),
    'file_widget_multiple' => array(
593
      'render element' => 'element',
594
    ),
595
596
597
    'file_formatter_table' => array(
      'variables' => array('items' => NULL),
    ),
598
    'file_upload_help' => array(
599
      'variables' => array('description' => NULL, 'upload_validators' => NULL),
600
601
602
603
604
    ),
  );
}

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

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

629
  // Find out which (if any) fields of this type contain the file.
630
  $references = file_get_file_references($file, NULL, FIELD_LOAD_CURRENT, $field_type);
631

632
633
634
635
636
  // 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.
637
  if (empty($references) && ($file->status == FILE_STATUS_PERMANENT || $file->uid != $user->uid)) {
638
    return;
639
640
  }

641
642
643
644
645
646
647
648
  // Default to allow access.
  $denied = FALSE;
  // Loop through all references of this file. If a reference explicitly allows
  // access to the field to which this file belongs, no further checks are done
  // and download access is granted. If a reference denies access, eventually
  // existing additional references are checked. If all references were checked
  // and no reference denied access, access is granted as well. If at least one
  // reference denied access, access is denied.
649
  foreach ($references as $field_name => $field_references) {
650
651
    foreach ($field_references as $entity_type => $entities) {
      foreach ($entities as $entity) {
652
        $field = field_info_field($field_name);
653
654
        // Check if access to this field is not disallowed.
        if (!field_access('view', $field, $entity_type, $entity)) {
655
          $denied = TRUE;
656
          continue;
657
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);
        foreach (module_implements('file_download_access') as $module) {
663
          $grants = array_merge($grants, array($module => module_invoke($module, 'file_download_access', $field, $entity, $file)));
664
665
        }
        // Allow other modules to alter the returned grants/denies.
666
667
668
669
670
671
        $context = array(
          'entity' => $entity,
          'field' => $field,
          'file' => $file,
        );
        drupal_alter('file_download_access', $grants, $context);
672
673
674
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677
678
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681
682
683
684

        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;
685
686
687
688
689
        }
      }
    }
  }

690
691
  // Access specifically denied.
  if ($denied) {
692
693
694
695
    return -1;
  }

  // Access is granted.
696
697
  $headers = file_get_content_headers($file);
  return $headers;
698
699
}

700
701
702
703
/**
 * Implements file_cron()
 */
function file_cron() {
704
  $result = entity_get_controller('file')->retrieveTemporaryFiles();
705
706
  foreach ($result as $row) {
    if ($file = file_load($row->fid)) {
707
      $references = file_usage()->listUsage($file);
708
709
710
711
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713
714
715
716
717
718
719
720
721
722
      if (empty($references)) {
        if (file_exists($file->uri)) {
          $file->delete();
        }
        else {
          watchdog('file system', 'Could not delete temporary file "%path" during garbage collection', array('%path' => $file->uri), WATCHDOG_ERROR);
        }
      }
      else {
        watchdog('file system', 'Did not delete temporary file "%path" during garbage collection because it is in use by the following modules: %modules.', array('%path' => $file->uri, '%modules' => implode(', ', array_keys($references))), WATCHDOG_INFO);
      }
    }
  }
}

723
/**
724
725
 * Ajax callback: Processes file uploads and deletions.
 *
726
727
728
729
 * 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.
730
731
 *
 * @see file_menu()
732
733
734
735
736
737
738
739
 */
function file_ajax_upload() {
  $form_parents = func_get_args();
  $form_build_id = (string) array_pop($form_parents);

  if (empty($_POST['form_build_id']) || $form_build_id != $_POST['form_build_id']) {
    // Invalid request.
    drupal_set_message(t('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (@size) that this server supports.', array('@size' => format_size(file_upload_max_size()))), 'error');
740
741
    $response = new AjaxResponse();
    return $response->addCommand(new ReplaceCommand(NULL, theme('status_messages')));
742
743
  }

744
  list($form, $form_state) = ajax_get_form();
745
746
747
748

  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');
749
750
    $response = new AjaxResponse();
    return $response->addCommand(new ReplaceCommand(NULL, theme('status_messages')));
751
752
753
754
755
756
757
758
759
  }

  // 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;

760
761
  // Process user input. $form and $form_state are modified in the process.
  drupal_process_form($form['#form_id'], $form, $form_state);
762
763
764
765
766
767

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

768
  // Add the special Ajax class if a new file was added.
769
770
771
772
773
774
775
776
777
778
  if (isset($form['#file_upload_delta']) && $current_file_count < $form['#file_upload_delta']) {
    $form[$current_file_count]['#attributes']['class'][] = 'ajax-new-content';
  }
  // Otherwise just add the new content class on a placeholder.
  else {
    $form['#suffix'] .= '<span class="ajax-new-content"></span>';
  }

  $output = theme('status_messages') . drupal_render($form);
  $js = drupal_add_js();
779
  $settings = NestedArray::mergeDeepArray($js['settings']['data']);
780

781
782
  $response = new AjaxResponse();
  return $response->addCommand(new ReplaceCommand(NULL, $output, $settings));
783
784
785
}

/**
786
787
 * Ajax callback: Retrieves upload progress.
 *
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
 * @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']);
    }
  }

813
  return new JsonResponse($progress);
814
815
816
}

/**
817
 * Determines the preferred upload progress implementation.
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
 *
 * @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;
}

/**
841
 * Implements hook_file_predelete().
842
 */
843
function file_file_predelete(File $file) {
844
845
846
847
  // TODO: Remove references to a file that is in-use.
}

/**
848
 * Render API callback: Expands the managed_file element type.
849
850
851
 *
 * Expands the file type to include Upload and Remove buttons, as well as
 * support for a default value.
852
853
 *
 * This function is assigned as a #process callback in file_element_info().
854
855
 */
function file_managed_file_process($element, &$form_state, $form) {
856
857
858
  // Append the '-upload' to the #id so the field label's 'for' attribute
  // corresponds with the file element.
  $element['#id'] .= '-upload';
859
860
861
862
863
864
865
866
  $fid = isset($element['#value']['fid']) ? $element['#value']['fid'] : 0;

  // Set some default element properties.
  $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
  $element['#file'] = $fid ? file_load($fid) : FALSE;
  $element['#tree'] = TRUE;

  $ajax_settings = array(
867
    'path' => 'file/ajax/' . implode('/', $element['#array_parents']) . '/' . $form['form_build_id']['#value'],
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
    '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(
    '#name' => implode('_', $element['#parents']) . '_upload_button',
    '#type' => 'submit',
    '#value' => t('Upload'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
883
    '#limit_validation_errors' => array($element['#parents']),
884
885
886
887
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

888
889
890
  // 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';
891
892
893
894
895
896
897
898
  $ajax_settings['progress']['message'] = NULL;
  $ajax_settings['effect'] = 'none';
  $element['remove_button'] = array(
    '#name' => implode('_', $element['#parents']) . '_remove_button',
    '#type' => 'submit',
    '#value' => t('Remove'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
899
    '#limit_validation_errors' => array($element['#parents']),
900
901
902
903
904
905
906
907
908
909
910
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

  $element['fid'] = array(
    '#type' => 'hidden',
    '#value' => $fid,
  );

  // Add progress bar support to the upload if possible.
  if ($element['#progress_indicator'] == 'bar' && $implementation = file_progress_implementation()) {
911
    $upload_progress_key = mt_rand();
912
913
914
915
916
917

    if ($implementation == 'uploadprogress') {
      $element['UPLOAD_IDENTIFIER'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
918
919
920
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
921
922
923
924
925
926
927
      );
    }
    elseif ($implementation == 'apc') {
      $element['APC_UPLOAD_PROGRESS'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
928
929
930
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
931
932
933
934
935
936
937
938
939
940
941
      );
    }

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

  // The file upload field itself.
  $element['upload'] = array(
    '#name' => 'files[' . implode('_', $element['#parents']) . ']',
    '#type' => 'file',
942
943
    '#title' => t('Choose a file'),
    '#title_display' => 'invisible',
944
    '#size' => $element['#size'],
945
946
947
948
949
950
951
    '#theme_wrappers' => array(),
    '#weight' => -10,
  );

  if ($fid && $element['#file']) {
    $element['filename'] = array(
      '#type' => 'markup',
952
      '#markup' => theme('file_link', array('file' => $element['#file'])) . ' ',
953
954
955
956
      '#weight' => -10,
    );
  }

957
  // Add the extension list to the page as JavaScript settings.
958
  if (isset($element['#upload_validators']['file_validate_extensions'][0])) {
959
960
961
962
963
964
965
    $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)))
      )
    );
966
967
  }

968
  // Prefix and suffix used for Ajax replacement.
969
970
971
972
973
974
975
  $element['#prefix'] = '<div id="' . $element['#id'] . '-ajax-wrapper">';
  $element['#suffix'] = '</div>';

  return $element;
}

/**
976
977
978
 * Render API callback: Determines the value for a managed_file type element.
 *
 * This function is assigned as a #value_callback in file_element_info().
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
 */
function file_managed_file_value(&$element, $input = FALSE, $form_state = NULL) {
  $fid = 0;

  // Find the current value of this field from the form state.
  $form_state_fid = $form_state['values'];
  foreach ($element['#parents'] as $parent) {
    $form_state_fid = isset($form_state_fid[$parent]) ? $form_state_fid[$parent] : 0;
  }

  if ($element['#extended'] && isset($form_state_fid['fid'])) {
    $fid = $form_state_fid['fid'];
  }
  elseif (is_numeric($form_state_fid)) {
    $fid = $form_state_fid;
  }

  // Process any input and save new uploads.
  if ($input !== FALSE) {
    $return = $input;

    // Uploads take priority over all other values.
    if ($file = file_managed_file_save_upload($element)) {
      $fid = $file->fid;
    }
    else {
      // Check for #filefield_value_callback values.
      // Because FAPI does not allow multiple #value_callback values like it
      // does for #element_validate and #process, this fills the missing
      // functionality to allow File fields to be extended through FAPI.
      if (isset($element['#file_value_callbacks'])) {
        foreach ($element['#file_value_callbacks'] as $callback) {
1011
          $callback($element, $input, $form_state);
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
        }
      }
      // Load file if the FID has changed to confirm it exists.
      if (isset($input['fid']) && $file = file_load($input['fid'])) {
        $fid = $file->fid;
      }
    }
  }

  // If there is no input, set the default value.
  else {
    if ($element['#extended']) {
      $default_fid = isset($element['#default_value']['fid']) ? $element['#default_value']['fid'] : 0;
      $return = isset($element['#default_value']) ? $element['#default_value'] : array('fid' => 0);
    }
    else {
      $default_fid = isset($element['#default_value']) ? $element['#default_value'] : 0;
      $return = array('fid' => 0);
    }

    // Confirm that the file exists when used as a default value.
    if ($default_fid && $file = file_load($default_fid)) {
      $fid = $file->fid;
    }
  }

  $return['fid'] = $fid;

  return $return;
}

/**
1044
1045
1046
1047
 * Render API callback: Validates the managed_file element.
 *
 * This function is assigned as a #element_validate callback in
 * file_element_info().
1048
1049
1050
1051
1052
 */
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.
1053
  $clicked_button = end($form_state['triggering_element']['#parents']);
1054
1055
1056
  if ($clicked_button != 'remove_button' && !empty($element['fid']['#value'])) {
    if ($file = file_load($element['fid']['#value'])) {
      if ($file->status == FILE_STATUS_PERMANENT) {
1057
        $references = file_usage()->listUsage($file);
1058
1059
        if (empty($references)) {
          form_error($element, t('The file used in the !name field may not be referenced.', array('!name' => $element['#title'])));
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
        }
      }
    }
    else {
      form_error($element, t('The file referenced by the !name field does not exist.', array('!name' => $element['#title'])));
    }
  }

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

  // Consolidate the array value of this field to a single FID.
  if (!$element['#extended']) {
    form_set_value($element, $element['fid']['#value'], $form_state);
  }
}

/**
1080
1081
1082
 * Form submission handler for upload / remove buttons of managed_file elements.
 *
 * @see file_managed_file_process()
1083
1084
 */
function file_managed_file_submit($form, &$form_state) {
1085
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1088
  // 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);
1089
  $element = NestedArray::getValue($form, $parents);
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1092
1093
1094
1095
1096

  // 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 ($button_key == 'remove_button') {
    // If it's a temporary file we can safely remove it immediately, otherwise
1097
1098
    // it's up to the implementing module to remove usages of files to have them
    // removed.
1099
    if ($element['#file'] && $element['#file']->status == 0) {
1100
      file_delete($element['#file']->fid);
1101
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1104
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1106
1107
    }
    // 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()
1108
    // has correct information during the rebuild.
1109
1110
    $values_element = $element['#extended'] ? $element['fid'] : $element;
    form_set_value($values_element, NULL, $form_state);
1111
    NestedArray::setValue($form_state['input'], $values_element['#parents'], NULL);
1112
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1115
1116
1117
1118
1119
1120
  }

  // 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;
1121
1122
1123
}

/**
1124
 * Saves any files that have been uploaded into a managed_file element.
1125
1126
1127
 *
 * @param $element
 *   The FAPI element whose values are being saved.
1128
 *
1129
 * @return
1130
 *   The file entity representing the file that was saved, or FALSE if no file
1131
1132
1133
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1155
 *   was saved.
 */
function file_managed_file_save_upload($element) {
  $upload_name = implode('_', $element['#parents']);
  if (empty($_FILES['files']['name'][$upload_name])) {
    return FALSE;
  }

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

  if (!$file = file_save_upload($upload_name, $element['#upload_validators'], $destination)) {
    watchdog('file', 'The file upload failed. %upload', array('%upload' => $upload_name));
    form_set_error($upload_name, t('The file in the !name field was unable to be uploaded.', array('!name' => $element['#title'])));
    return FALSE;
  }

  return $file;
}

/**
1156
1157
1158
1159
1160
1161
1162
 * Returns HTML for a managed file element.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element representing the file.
 *
 * @ingroup themeable
1163
 */
1164
1165
1166
function theme_file_managed_file($variables) {
  $element = $variables['element'];

1167
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  $attributes = array();
  if (isset($element['#id'])) {
    $attributes['id'] = $element['#id'];
  }
  if (!empty($element['#attributes']['class'])) {
    $attributes['class'] = (array) $element['#attributes']['class'];
  }
  $attributes['class'][] = 'form-managed-file';

1176
1177
  // This wrapper is required to apply JS behaviors and CSS styling.
  $output = '';
1178
  $output .= '<div' . new Attribute($attributes) . '>';
1179
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1181
1182
1183
  $output .= drupal_render_children($element);
  $output .= '</div>';
  return $output;
}

1184
/**
1185
 * Render API callback: Hides display of the upload or remove controls.
1186
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1189
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1192
1193
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1195
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1199
 *
 * Upload controls are hidden when a file is already uploaded. Remove controls
 * are hidden when there is no file attached. Controls are hidden here instead
 * of in file_managed_file_process(), because #access for these buttons depends
 * on the managed_file element's #value. See the documentation of form_builder()
 * for more detailed information about the relationship between #process,
 * #value, and #access.
 *
 * Because #access is set here, it affects display only and does not prevent
 * JavaScript or other untrusted code from submitting the form as though access
 * were enabled. The form processing functions for these elements should not
 * assume that the buttons can't be "clicked" just because they are not
 * displayed.
 *
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1201
 * This function is assigned as a #pre_render callback in file_element_info().
 *
1202
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1205
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1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
 * @see file_managed_file_process()
 * @see form_builder()
 */
function file_managed_file_pre_render($element) {
  // If we already have a file, we don't want to show the upload controls.
  if (!empty($element['#value']['fid'])) {
    $element['upload']['#access'] = FALSE;
    $element['upload_button']['#access'] = FALSE;
  }
  // If we don't already have a file, there is nothing to remove.
  else {
    $element['remove_button']['#access'] = FALSE;
  }
  return $element;
}

1218
/**
1219
 * Returns HTML for a link to a file.
1220
 *
1221
1222
1223
 * @param $variables
 *   An associative array containing:
 *   - file: A file object to which the link will be created.
1224
 *   - icon_directory: (optional) A path to a directory of icons to be used for
1225
1226
 *     files. Defaults to the value of the "icon.directory"
 *     variable.
1227
1228
 *
 * @ingroup themeable
1229
 */
1230
1231
function theme_file_link($variables) {
  $file = $variables['file'];
1232
  $icon_directory = $variables['icon_directory'];
1233

1234
  $url = file_create_url($file->uri);
1235
1236
  // theme_file_icon() requires a file entity, make sure it gets one.
  $icon = theme('file_icon', array('file' => ($file instanceof File) ? $file : file_load($file->fid), 'icon_directory' => $icon_directory));
1237
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1243
1244
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1246

  // Set options as per anchor format described at
  // http://microformats.org/wiki/file-format-examples
  $options = array(
    'attributes' => array(
      'type' => $file->filemime . '; length=' . $file->filesize,
    ),
  );

  // Use the description as the link text if available.
1247
  if (empty($file->description)) {
1248
    $link_text = $file->filename;
1249
1250
  }
  else {
1251
    $link_text = $file->description;
1252
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1258
    $options['attributes']['title'] = check_plain($file->filename);
  }

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

/**
1259
 * Returns HTML for an image with an appropriate icon for the given file.
1260
 *
1261
1262
 * @param $variables
 *   An associative array containing:
1263
 *   - file: A file entity for which to make an icon.
1264
 *   - icon_directory: (optional) A path to a directory of icons to be used for
1265
1266
 *     files. Defaults to the value of the "icon.directory"
 *     variable.
1267
1268
 *
 * @ingroup themeable
1269
 */
1270
1271
function theme_file_icon($variables) {
  $file = $variables['file'];
1272
  $icon_directory = $variables['icon_directory'];
1273

1274
  $mime = check_plain($file->filemime);
1275
  $icon_url = file_icon_url($file, $icon_directory);
1276
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1279
  return '<img class="file-icon" alt="" title="' . $mime . '" src="' . $icon_url . '" />';
}

/**
1280
 * Creates a URL to the icon for a file entity.
1281
 *
1282
 * @param Drupal\file\File $file
1283
 *   A file entity.
1284
1285
 * @param $icon_directory
 *   (optional) A path to a directory of icons to be used for files. Defaults to
1286
 *   the value of the "icon.directory" variable.
1287
 *
1288
1289
1290
 * @return
 *   A URL string to the icon, or FALSE if an appropriate icon cannot be found.
 */
1291
function file_icon_url(File $file, $icon_directory = NULL) {
1292
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1294
1295
1296
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1298
  if ($icon_path = file_icon_path($file, $icon_directory)) {
    return base_path() . $icon_path;
  }
  return FALSE;
}

/**
1299
 * Creates a path to the icon for a file entity.
1300
 *
1301
 * @param Drupal\file\File $file
1302
 *   A file entity.
1303
1304
 * @param $icon_directory
 *   (optional) A path to a directory of icons to be used for files. Defaults to
1305
 *   the value of the "icon.directory" variable.
1306
 *
1307
1308
1309
1310
 * @return
 *   A string to the icon as a local path, or FALSE if an appropriate icon could
 *   not be found.
 */
1311
function file_icon_path(File $file, $icon_directory = NULL) {
1312
1313
  // Use the default set of icons if none specified.
  if (!isset($icon_directory)) {
1314
    $icon_directory = config('file.settings')->get('icon.directory');
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  }

  // If there's an icon matching the exact mimetype, go for it.
  $dashed_mime = strtr($file->filemime, array('/' => '-'));
  $icon_path = $icon_directory . '/' . $dashed_mime . '.png';
  if (file_exists($icon_path)) {
    return $icon_path;
  }

  // For a few mimetypes, we can "manually" map to a generic icon.
  $generic_mime = (string) file_icon_map($file);
  $icon_path = $icon_directory . '/' . $generic_mime . '.png';
  if ($generic_mime && file_exists($icon_path)) {
    return $icon_path;
  }

  // Use generic icons for each category that provides such icons.
  foreach (array('audio', 'image', 'text', 'video') as $category) {
    if (strpos($file->filemime, $category . '/') === 0) {
      $icon_path = $icon_directory . '/' . $category . '-x-generic.png';
      if (file_exists($icon_path)) {
        return $icon_path;
      }
    }
  }

  // Try application-octet-stream as last fallback.
  $icon_path = $icon_directory . '/application-octet-stream.png';
  if (file_exists($icon_path)) {
    return $icon_path;
  }

  // No icon can be found.
  return FALSE;
}

/**
1352
 * Determines the generic icon MIME package based on a file's MIME type.
1353
 *
1354
 * @param Drupal\file\File $file
1355
 *   A file entity.
1356
 *
1357
1358
1359
 * @return
 *   The generic icon MIME package expected for this file.
 */
1360
function file_icon_map(File $file) {
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1483
  switch ($file->filemime) {
    // Word document types.
    case 'application/msword':
    case 'application/vnd.ms-word.document.macroEnabled.12':
    case 'application/vnd.oasis.opendocument.text':
    case 'application/vnd.oasis.opendocument.text-template':
    case 'application/vnd.oasis.opendocument.text-master':
    case 'application/vnd.oasis.opendocument.text-web':
    case 'application/vnd.openxmlformats-officedocument.wordprocessingml.document':
    case 'application/vnd.stardivision.writer':
    case 'application/vnd.sun.xml.writer':
    case 'application/vnd.sun.xml.writer.template':
    case 'application/vnd.sun.xml.writer.global':
    case 'application/vnd.wordperfect':
    case 'application/x-abiword':
    case 'application/x-applix-word':
    case 'application/x-kword':
    case 'application/x-kword-crypt':
      return 'x-office-document';

    // Spreadsheet document types.
    case 'application/vnd.ms-excel':
    case 'application/vnd.ms-excel.sheet.macroEnabled.12':
    case 'application/vnd.oasis.opendocument.spreadsheet':
    case 'application/vnd.oasis.opendocument.spreadsheet-template':
    case 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet':
    case 'application/vnd.stardivision.calc':
    case 'application/vnd.sun.xml.calc':
    case 'application/vnd.sun.xml.calc.template':
    case 'application/vnd.lotus-1-2-3':
    case 'application/x-applix-spreadsheet':
    case 'application/x-gnumeric':
    case 'application/x-kspread':
    case 'application/x-kspread-crypt':
      return 'x-office-spreadsheet';

    // Presentation document types.
    case 'application/vnd.ms-powerpoint':
    case 'application/vnd.ms-powerpoint.presentation.macroEnabled.12':
    case 'application/vnd.oasis.opendocument.presentation':
    case 'application/vnd.oasis.opendocument.presentation-template':
    case 'application/vnd.openxmlformats-officedocument.presentationml.presentation':
    case 'application/vnd.stardivision.impress':
    case 'application/vnd.sun.xml.impress':
    case 'application/vnd.sun.xml.impress.template':
    case 'application/x-kpresenter':
      return 'x-office-presentation';

    // Compressed archive types.
    case 'application/zip':
    case 'application/x-zip':
    case 'application/stuffit':
    case 'application/x-stuffit':
    case 'application/x-7z-compressed':
    case 'application/x-ace':
    case 'application/x-arj':
    case 'application/x-bzip':
    case 'application/x-bzip-compressed-tar':
    case 'application/x-compress':
    case 'application/x-compressed-tar':
    case 'application/x-cpio-compressed':
    case 'application/x-deb':
    case 'application/x-gzip':
    case 'application/x-java-archive':
    case 'application/x-lha':
    case 'application/x-lhz':
    case 'application/x-lzop':
    case 'application/x-rar':
    case 'application/x-rpm':
    case 'application/x-tzo':
    case 'application/x-tar':
    case 'application/x-tarz':
    case 'application/x-tgz':
      return 'package-x-generic';

    // Script file types.
    case 'application/ecmascript':
    case 'application/javascript':
    case 'application/mathematica':
    case 'application/vnd.mozilla.xul+xml':
    case 'application/x-asp':
    case 'application/x-awk':
    case 'application/x-cgi':
    case 'application/x-csh':
    case 'application/x-m4':
    case 'application/x-perl':
    case 'application/x-php':
    case 'application/x-ruby':
    case 'application/x-shellscript':
    case 'text/vnd.wap.wmlscript':
    case 'text/x-emacs-lisp':
    case 'text/x-haskell':
    case 'text/x-literate-haskell':
    case 'text/x-lua':
    case 'text/x-makefile':
    case 'text/x-matlab':
    case 'text/x-python':
    case 'text/x-sql':
    case 'text/x-tcl':
      return 'text-x-script';

    // HTML aliases.
    case 'application/xhtml+xml':
      return 'text-html';

    // Executable types.
    case 'application/x-macbinary':
    case 'application/x-ms-dos-executable':
    case 'application/x-pef-executable':
      return 'application-x-executable';

    default:
      return FALSE;
  }
}

/**
 * @defgroup file-module-api File module public API functions
 * @{
 * These functions may be used to determine if and where a file is in use.
 */

/**
1484
 * Retrieves a list of references to a file.
1485
 *
1486
 * @param Drupal\file\File $file
1487
 *   A file entity.
1488
 * @param $field
1489
1490
 *   (optional) A field array to be used for this check. If given, limits the
 *   reference check to the given field.
1491
1492
1493
1494
 * @param $age
 *   (optional) A constant that specifies which references to count. Use
 *   FIELD_LOAD_REVISION to retrieve all references within all revisions or
 *   FIELD_LOAD_CURRENT to retrieve references only in the current revisions.
1495
 * @param $field_type
1496
 *   (optional) The name of a field type. If given, limits the reference check
1497
1498
1499
 *   to fields of the given type. If both $field and $field_type is given but
 *   $field is not the same type as $field_type, an empty array will be
 *   returned.
1500
 *
1501
 * @return
1502
1503
 *   A multidimensional array. The keys are field_name, entity_type,
 *   entity_id and the value is an entity referencing this file.
1504
 */
1505
function file_get_file_references(File $file, $field = NULL, $age = FIELD_LOAD_REVISION, $field_type = 'file') {
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
  $references = &drupal_static(__FUNCTION__, array());
  $field_columns = &drupal_static(__FUNCTION__ . ':field_columns', array());

  // Fill the static cache, disregard $field and $field_type for now.
  if (!isset($references[$file->fid][$age])) {
    $references[$file->fid][$age] = array();
    $usage_list = file_usage()->listUsage($file);
    $file_usage_list = isset($usage_list['file']) ? $usage_list['file'] : array();
    foreach ($file_usage_list as $entity_type => $entity_ids) {
      $entity_info = entity_get_info($entity_type);
      // The usage table contains usage of every revision. If we are looking
      // for every revision or the entity does not support revisions then
      // every usage is already a match.
1519
      $match_entity_type = $age == FIELD_LOAD_REVISION || !isset($entity_info['entity_keys']['revision']);
1520
1521
1522
1523
1524
1525
1526
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1528
1529
1530
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1532
1533
1534
1535
1536
1537
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1541
1542
1543
1544
1545
1546
      $entities = entity_load_multiple($entity_type, $entity_ids);
      foreach ($entities as $entity) {
        $bundle = $entity->bundle();
        // We need to find file fields for this entity type and bundle.
        if (!isset($file_fields[$entity_type][$bundle])) {
          $file_fields[$entity_type][$bundle] = array();
          // This contains the possible field names.
          $instances = field_info_instances($entity_type, $bundle);
          foreach ($instances as $field_name => $instance) {
            $current_field = field_info_field($field_name);
            // If this is the first time this field type is seen, check
            // whether it references files.
            if (!isset($field_columns[$current_field['type']])) {
              $field_columns[$current_field['type']] = file_field_find_file_reference_column($current_field);
            }
            // If the field type does reference files then record it.
            if ($field_columns[$current_field['type']]) {
              $file_fields[$entity_type][$bundle][$field_name] = $field_columns[$current_field['type']];
            }
          }
        }
        foreach ($file_fields[$entity_type][$bundle] as $field_name => $field_column) {
          $match = $match_entity_type;
          // If we didn't match yet then iterate over the field items to find
          // the referenced file. This will fail if the usage checked is in a
          // non-current revision because field items are from the current
          // revision.
1547
          if (!$match && ($field_items = field_get_items($entity, $field_name))) {
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
            foreach ($field_items as $item) {
              if ($file->fid == $item[$field_column]) {
                $match = TRUE;
                break;
              }
            }
          }
          if ($match) {
            $references[$file->fid][$age][$field_name][$entity_type][$entity->id()] = $entity;
          }
        }
      }
1560
1561
    }
  }
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
  $return = $references[$file->fid][$age];
  // Filter the static cache down to the requested entries. The usual static
  // cache is very small so this will be very fast.
  if ($field || $field_type) {
    foreach ($return as $field_name => $data) {
      $current_field = field_info_field($field_name);
      if (($field_type && $current_field['type'] != $field_type) || ($field && $field['id'] != $current_field['id'])) {
        unset($return[$field_name]);
      }
    }
  }
  return $return;
1574
1575
1576
1577
1578
}

/**
 * @} End of "defgroup file-module-api".
 */
1579
1580
1581
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1585
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1587
1588
1589
1590
1591
1592
1593
1594
1595

/**
 * Implements hook_library_info().
 */
function file_library_info() {
  $libraries['drupal.file'] = array(
    'title' => 'File',
    'version' => VERSION,
    'js' => array(
      drupal_get_path('module', 'file') . '/file.js' => array(),
    ),
    'css' => array(
      drupal_get_path('module', 'file') . '/file.admin.css'
    ),
    'dependencies' => array(
      array('system', 'jquery'),
      array('system', 'drupal'),
1596
      array('system', 'drupalSettings'),
1597
1598
1599
1600
1601
    ),
  );

  return $libraries;
}