file.module 60.9 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 $reset
 *   Whether to reset the internal file_load_multiple() cache.
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 *
 * @return Drupal\file\File
 *   A file entity or FALSE if the file was not found.
 *
 * @see hook_file_load()
 * @see file_load_multiple()
 */
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function file_load($fid, $reset = FALSE) {
  $files = file_load_multiple(array($fid), $reset);
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  return reset($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.
 *
 * @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($file_limit)));
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  }
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  // Save a query by only calling spaceUsed() when a limit is provided.
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  if ($user_limit && (Drupal::entityManager()->getStorageController('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(
569
    'Content-Type' => $type,
570
571
572
573
574
    'Content-Length' => $file->filesize,
    'Cache-Control' => 'private',
  );
}

575
/**
576
 * Implements hook_theme().
577
578
579
580
581
 */
function file_theme() {
  return array(
    // file.module.
    'file_link' => array(
582
      'variables' => array('file' => NULL, 'icon_directory' => NULL, 'description' => NULL),
583
584
    ),
    'file_icon' => array(
585
      'variables' => array('file' => NULL, 'icon_directory' => NULL),
586
587
    ),
    'file_managed_file' => array(
588
      'render element' => 'element',
589
590
591
592
    ),

    // file.field.inc.
    'file_widget' => array(
593
      'render element' => 'element',
594
595
    ),
    'file_widget_multiple' => array(
596
      'render element' => 'element',
597
    ),
598
599
600
    'file_formatter_table' => array(
      'variables' => array('items' => NULL),
    ),
601
    'file_upload_help' => array(
602
      'variables' => array('description' => NULL, 'upload_validators' => NULL, 'cardinality' => NULL),
603
604
605
606
607
    ),
  );
}

/**
608
 * Implements hook_file_download().
609
610
611
 *
 * This function takes an extra parameter $field_type so that it may
 * be re-used by other File-like modules, such as Image.
612
 */
613
function file_file_download($uri, $field_type = 'file') {
614
615
616
  global $user;

  // Get the file record based on the URI. If not in the database just return.
617
  $files = entity_load_multiple_by_properties('file', array('uri' => $uri));
618
  if (count($files)) {
619
620
621
622
623
624
625
626
    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 = $item;
        break;
      }
    }
627
  }
628
  if (!isset($file)) {
629
630
631
    return;
  }

632
  // Find out which (if any) fields of this type contain the file.
633
  $references = file_get_file_references($file, NULL, FIELD_LOAD_CURRENT, $field_type);
634

635
636
637
638
639
  // 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.
640
  if (empty($references) && ($file->status == FILE_STATUS_PERMANENT || $file->uid != $user->uid)) {
641
    return;
642
643
  }

644
645
646
647
648
649
650
651
  // Default to allow access.
  $denied = FALSE;
  // Loop through all references of this file. If a reference explicitly allows
  // access to the field to which this file belongs, no further checks are done
  // and download access is granted. If a reference denies access, eventually
  // existing additional references are checked. If all references were checked
  // and no reference denied access, access is granted as well. If at least one
  // reference denied access, access is denied.
652
  foreach ($references as $field_name => $field_references) {
653
654
    foreach ($field_references as $entity_type => $entities) {
      foreach ($entities as $entity) {
655
        $field = field_info_field($field_name);
656
657
        // Check if access to this field is not disallowed.
        if (!field_access('view', $field, $entity_type, $entity)) {
658
          $denied = TRUE;
659
          continue;
660
661
662
663
664
665
        }

        // 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) {
666
          $grants = array_merge($grants, array($module => module_invoke($module, 'file_download_access', $field, $entity, $file)));
667
668
        }
        // Allow other modules to alter the returned grants/denies.
669
670
671
672
673
674
        $context = array(
          'entity' => $entity,
          'field' => $field,
          'file' => $file,
        );
        drupal_alter('file_download_access', $grants, $context);
675
676
677
678
679
680
681
682
683
684
685
686
687

        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;
688
689
690
691
692
        }
      }
    }
  }

693
694
  // Access specifically denied.
  if ($denied) {
695
696
697
698
    return -1;
  }

  // Access is granted.
699
700
  $headers = file_get_content_headers($file);
  return $headers;
701
702
}

703
704
705
706
/**
 * Implements file_cron()
 */
function file_cron() {
707
  $result = Drupal::entityManager()->getStorageController('file')->retrieveTemporaryFiles();
708
709
  foreach ($result as $row) {
    if ($file = file_load($row->fid)) {
710
      $references = file_usage()->listUsage($file);
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
      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);
      }
    }
  }
}

726
/**
727
728
 * Ajax callback: Processes file uploads and deletions.
 *
729
730
731
732
 * 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.
733
734
 *
 * @see file_menu()
735
736
737
738
739
740
741
742
 */
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');
743
744
    $response = new AjaxResponse();
    return $response->addCommand(new ReplaceCommand(NULL, theme('status_messages')));
745
746
  }

747
  list($form, $form_state) = ajax_get_form();
748
749
750
751

  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');
752
753
    $response = new AjaxResponse();
    return $response->addCommand(new ReplaceCommand(NULL, theme('status_messages')));
754
755
756
757
758
759
760
761
762
  }

  // 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;

763
764
  // Process user input. $form and $form_state are modified in the process.
  drupal_process_form($form['#form_id'], $form, $form_state);
765
766
767
768
769
770

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

771
  // Add the special Ajax class if a new file was added.
772
773
774
775
776
777
778
779
  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>';
  }

780
781
  $form['#prefix'] .= theme('status_messages');
  $output = drupal_render($form);
782
  $js = drupal_add_js();
783
  $settings = drupal_merge_js_settings($js['settings']['data']);
784

785
786
  $response = new AjaxResponse();
  return $response->addCommand(new ReplaceCommand(NULL, $output, $settings));
787
788
789
}

/**
790
791
 * Ajax callback: Retrieves upload progress.
 *
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
 * @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']);
    }
  }

817
  return new JsonResponse($progress);
818
819
820
}

/**
821
 * Determines the preferred upload progress implementation.
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
 *
 * @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;
}

/**
845
 * Implements hook_file_predelete().
846
 */
847
function file_file_predelete(File $file) {
848
849
850
851
  // TODO: Remove references to a file that is in-use.
}

/**
852
 * Render API callback: Expands the managed_file element type.
853
854
855
 *
 * Expands the file type to include Upload and Remove buttons, as well as
 * support for a default value.
856
857
 *
 * This function is assigned as a #process callback in file_element_info().
858
859
 */
function file_managed_file_process($element, &$form_state, $form) {
860
861
862
  // Append the '-upload' to the #id so the field label's 'for' attribute
  // corresponds with the file element.
  $element['#id'] .= '-upload';
863
864
865
866
867

  // 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();
868
869
870

  // Set some default element properties.
  $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
871
  $element['#files'] = !empty($fids) ? file_load_multiple($fids) : FALSE;
872
873
874
  $element['#tree'] = TRUE;

  $ajax_settings = array(
875
    'path' => 'file/ajax/' . implode('/', $element['#array_parents']) . '/' . $form['form_build_id']['#value'],
876
877
878
879
880
881
882
883
884
885
    '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(
886
    '#name' => $parents_prefix . '_upload_button',
887
888
889
890
    '#type' => 'submit',
    '#value' => t('Upload'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
891
    '#limit_validation_errors' => array($element['#parents']),
892
893
894
895
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

896
897
898
  // 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';
899
900
901
  $ajax_settings['progress']['message'] = NULL;
  $ajax_settings['effect'] = 'none';
  $element['remove_button'] = array(
902
    '#name' => $parents_prefix . '_remove_button',
903
    '#type' => 'submit',
904
    '#value' => $element['#multiple'] ? t('Remove selected') : t('Remove'),
905
906
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
907
    '#limit_validation_errors' => array($element['#parents']),
908
    '#ajax' => $ajax_settings,
909
    '#weight' => 1,
910
911
  );

912
  $element['fids'] = array(
913
    '#type' => 'hidden',
914
    '#value' => $fids,
915
916
917
918
  );

  // Add progress bar support to the upload if possible.
  if ($element['#progress_indicator'] == 'bar' && $implementation = file_progress_implementation()) {
919
    $upload_progress_key = mt_rand();
920
921
922
923
924
925

    if ($implementation == 'uploadprogress') {
      $element['UPLOAD_IDENTIFIER'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
926
927
928
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
929
930
931
932
933
934
935
      );
    }
    elseif ($implementation == 'apc') {
      $element['APC_UPLOAD_PROGRESS'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
936
937
938
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
939
940
941
942
943
944
945
946
947
      );
    }

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

  // The file upload field itself.
  $element['upload'] = array(
948
    '#name' => 'files[' . $parents_prefix . ']',
949
    '#type' => 'file',
950
951
    '#title' => t('Choose a file'),
    '#title_display' => 'invisible',
952
    '#size' => $element['#size'],
953
    '#multiple' => $element['#multiple'],
954
955
956
957
    '#theme_wrappers' => array(),
    '#weight' => -10,
  );

958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
  if (!empty($fids) && $element['#files']) {
    foreach ($element['#files'] as $delta => $file) {
      if ($element['#multiple']) {
        $element['file_' . $delta]['selected'] = array(
          '#type' => 'checkbox',
          '#title' => theme('file_link', array('file' => $file)) . ' ',
        );
      }
      else {
        $element['file_' . $delta]['filename'] = array(
          '#type' => 'markup',
          '#markup' => theme('file_link', array('file' => $file)) . ' ',
          '#weight' => -10,
        );
      }
    }
974
975
  }

976
  // Add the extension list to the page as JavaScript settings.
977
  if (isset($element['#upload_validators']['file_validate_extensions'][0])) {
978
979
980
981
982
983
984
    $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)))
      )
    );
985
986
  }

987
  // Prefix and suffix used for Ajax replacement.
988
989
990
991
992
993
994
  $element['#prefix'] = '<div id="' . $element['#id'] . '-ajax-wrapper">';
  $element['#suffix'] = '</div>';

  return $element;
}

/**
995
996
997
 * Render API callback: Determines the value for a managed_file type element.
 *
 * This function is assigned as a #value_callback in file_element_info().
998
999
 */
function file_managed_file_value(&$element, $input = FALSE, $form_state = NULL) {
1000
1001
1002
1003
  // Find the current value of this field.
  $fids = !empty($input['fids']) ? explode(' ', $input['fids']) : array();
  foreach ($fids as $key => $fid) {
    $fids[$key] = (int) $fid;
1004
1005
1006
1007
  }

  // Process any input and save new uploads.
  if ($input !== FALSE) {
1008
    $input['fids'] = $fids;
1009
1010
1011
    $return = $input;

    // Uploads take priority over all other values.
1012
1013
1014
1015
1016
1017
1018
    if ($files = file_managed_file_save_upload($element)) {
      if ($element['#multiple']) {
        $fids = array_merge($fids, array_keys($files));
      }
      else {
        $fids = array_keys($files);
      }
1019
1020
1021
1022
1023
1024
1025
1026
    }
    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) {
1027
          $callback($element, $input, $form_state);
1028
1029
        }
      }
1030
1031
1032
1033
1034
1035
1036
1037
1038

      // Load files if the FIDs have changed to confirm they exist.
      if (!empty($input['fids'])) {
        $fids = array();
        foreach ($input['fids'] as $key => $fid) {
          if ($file = file_load($fid)) {
            $fids[] = $file->fid;
          }
        }
1039
1040
1041
1042
1043
1044
1045
      }
    }
  }

  // If there is no input, set the default value.
  else {
    if ($element['#extended']) {
1046
1047
      $default_fids = isset($element['#default_value']['fids']) ? $element['#default_value']['fids'] : array();
      $return = isset($element['#default_value']) ? $element['#default_value'] : array('fids' => array());
1048
1049
    }
    else {
1050
1051
      $default_fids = isset($element['#default_value']) ? $element['#default_value'] : array();
      $return = array('fids' => array());
1052
1053
1054
    }

    // Confirm that the file exists when used as a default value.
1055
1056
1057
1058
1059
1060
1061
    if (!empty($default_fids)) {
      $fids = array();
      foreach ($default_fids as $key => $fid) {
        if ($file = file_load($fid)) {
          $fids[] = $file->fid;
        }
      }
1062
1063
1064
    }
  }

1065
  $return['fids'] = $fids;
1066
1067
1068
1069
  return $return;
}

/**
1070
1071
1072
1073
 * Render API callback: Validates the managed_file element.
 *
 * This function is assigned as a #element_validate callback in
 * file_element_info().
1074
1075
1076
1077
1078
 */
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.
1079
  $clicked_button = end($form_state['triggering_element']['#parents']);
1080
1081
1082
1083
1084
1085
1086
1087
1088
  if ($clicked_button != 'remove_button' && !empty($element['fids']['#value'])) {
    $fids = $element['fids']['#value'];
    foreach ($fids as $fid) {
      if ($file = file_load($fid)) {
        if ($file->status == FILE_STATUS_PERMANENT) {
          $references = file_usage()->listUsage($file);
          if (empty($references)) {
            form_error($element, t('The file used in the !name field may not be referenced.', array('!name' => $element['#title'])));
          }
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        }
      }
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      else {
        form_error($element, t('The file referenced by the !name field does not exist.', array('!name' => $element['#title'])));
      }
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    }
  }

  // Check required property based on the FID.
1098
  if ($element['#required'] && empty($element['fids']['#value']) && !in_array($clicked_button, array('upload_button', 'remove_button'))) {
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    form_error($element['upload'], t('!name field is required.', array('!name' => $element['#title'])));
  }

1102
  // Consolidate the array value of this field to array of FIDs.
1103
  if (!$element['#extended']) {
1104
    form_set_value($element, $element['fids']['#value'], $form_state);
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1107
1108
  }
}

/**
1109
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1111
 * Form submission handler for upload / remove buttons of managed_file elements.
 *
 * @see file_managed_file_process()
1112
1113
 */
function file_managed_file_submit($form, &$form_state) {
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  // 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);
1118
  $element = NestedArray::getValue($form, $parents);
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1124

  // 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') {
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    $fids = array_keys($element['#files']);
    // Get files that will be removed.
    if ($element['#multiple']) {
      $remove_fids = array();
      foreach (element_children($element) as $name) {
        if (strpos($name, 'file_') === 0 && $element[$name]['selected']['#value']) {
          $remove_fids[] = (int) substr($name, 5);
        }
      }
      $fids = array_diff($fids, $remove_fids);
    }
    else {
1137
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1139
      // If we deal with single upload element remove the file and set
      // element's value to empty array (file could not be removed from
      // element if we don't do that).
1140
      $remove_fids = $fids;
1141
      $fids = array();
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    }

    foreach ($remove_fids as $fid) {
      // If it's a temporary file we can safely remove it immediately, otherwise
      // it's up to the implementing module to remove usages of files to have them
      // removed.
      if ($element['#files'][$fid] && $element['#files'][$fid]->status == 0) {
        file_delete($element['#files'][$fid]->fid);
      }
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    }
    // 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.
    // $form_state['input'] must be updated so that file_managed_file_value()
1158
    // has correct information during the rebuild.
1159
1160
    form_set_value($element['fids'], implode(' ', $fids), $form_state);
    NestedArray::setValue($form_state['input'], $element['fids']['#parents'], implode(' ', $fids));
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  }

  // 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;
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}

/**
1173
 * Saves any files that have been uploaded into a managed_file element.
1174
1175
1176
 *
 * @param $element
 *   The FAPI element whose values are being saved.
1177
 *
1178
 * @return
1179
1180
 *   An array of file entities for each file that was saved, keyed by its file
 *   ID, or FALSE if no files were saved.
1181
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 */
function file_managed_file_save_upload($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;
  }

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  // Save attached files to the database.
  $files_uploaded = $element['#multiple'] && count(array_filter($_FILES['files']['name'][$upload_name])) > 0;
  $files_uploaded |= !$element['#multiple'] && !empty($_FILES['files']['name'][$upload_name]);
  if ($files_uploaded) {
    if (!$files = 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('Files in the !name field were unable to be uploaded.', array('!name' => $element['#title'])));
      return array();
    }

    // Value callback expects FIDs to be keys.
    $files = array_filter($files);
    $fids = array_map(function($file) { return $file->fid; }, $files);

    return empty($files) ? array() : array_combine($fids, $files);
1210
1211
  }

1212
  return array();
1213
1214
1215
}

/**
1216
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1222
 * Returns HTML for a managed file element.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element representing the file.
 *
 * @ingroup themeable
1223
 */
1224
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function theme_file_managed_file($variables) {
  $element = $variables['element'];

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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';

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  // This wrapper is required to apply JS behaviors and CSS styling.
  $output = '';
1238
  $output .= '<div' . new Attribute($attributes) . '>';
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  $output .= drupal_render_children($element);
  $output .= '</div>';
  return $output;
}

1244
/**
1245
 * Render API callback: Hides display of the upload or remove controls.
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 *
 * 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.
 *
1260
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 * This function is assigned as a #pre_render callback in file_element_info().
 *
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 * @see file_managed_file_process()
 * @see form_builder()
 */
function file_managed_file_pre_render($element) {
  // If we already have a file, we don't want to show the upload controls.
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  if (!empty($element['#value']['fids'])) {
    if (!$element['#multiple']) {
      $element['upload']['#access'] = FALSE;
      $element['upload_button']['#access'] = FALSE;
    }
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  }
  // If we don't already have a file, there is nothing to remove.
  else {
    $element['remove_button']['#access'] = FALSE;
  }
  return $element;
}

1280
/**
1281
 * Returns HTML for a link to a file.
1282
 *
1283
1284
1285
 * @param $variables
 *   An associative array containing:
 *   - file: A file object to which the link will be created.
1286
 *   - icon_directory: (optional) A path to a directory of icons to be used for
1287
1288
 *     files. Defaults to the value of the "icon.directory"
 *     variable.
1289
 *   - description: A description to be displayed instead of the filename.
1290
1291
 *
 * @ingroup themeable
1292
 */
1293
1294
function theme_file_link($variables) {
  $file = $variables['file'];
1295
  $icon_directory = $variables['icon_directory'];
1296

1297
  $url = file_create_url($file->uri);
1298
  // theme_file_icon() requires a file entity, make sure it gets one.
1299
  $icon = theme('file_icon', array('file' => $file, 'icon_directory' => $icon_directory));
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1309

  // 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.
1310
  if (empty($variables['description'])) {
1311
    $link_text = $file->filename;
1312
1313
  }
  else {
1314
    $link_text = $variables['description'];
1315
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1319
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1321
    $options['attributes']['title'] = check_plain($file->filename);
  }

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

/**
1322
 * Returns HTML for an image with an appropriate icon for the given file.
1323
 *
1324
1325
 * @param $variables
 *   An associative array containing:
1326
 *   - file: A file entity for which to make an icon.
1327
 *   - icon_directory: (optional) A path to a directory of icons to be used for
1328
1329
 *     files. Defaults to the value of the "icon.directory"
 *     variable.
1330
1331
 *
 * @ingroup themeable
1332
 */
1333
1334
function theme_file_icon($variables) {
  $file = $variables['file'];
1335
  $icon_directory = $variables['icon_directory'];
1336

1337
  $mime = check_plain($file->filemime);
1338
  $icon_url = file_icon_url($file, $icon_directory);
1339
1340
1341
1342
  return '<img class="file-icon" alt="" title="' . $mime . '" src="' . $icon_url . '" />';
}

/**
1343
 * Creates a URL to the icon for a file entity.
1344
 *
1345
 * @param Drupal\file\File $file
1346
 *   A file entity.
1347
1348
 * @param $icon_directory
 *   (optional) A path to a directory of icons to be used for files. Defaults to
1349
 *   the value of the "icon.directory" variable.
1350
 *
1351
1352
1353
 * @return
 *   A URL string to the icon, or FALSE if an appropriate icon cannot be found.
 */
1354
function file_icon_url(File $file, $icon_directory = NULL) {
1355
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1357
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1359
1360
1361
  if ($icon_path = file_icon_path($file, $icon_directory)) {
    return base_path() . $icon_path;
  }
  return FALSE;
}

/**
1362
 * Creates a path to the icon for a file entity.
1363
 *
1364
 * @param Drupal\file\File $file
1365
 *   A file entity.
1366
1367
 * @param $icon_directory
 *   (optional) A path to a directory of icons to be used for files. Defaults to
1368
 *   the value of the "icon.directory" variable.
1369
 *
1370
1371
1372
1373
 * @return
 *   A string to the icon as a local path, or FALSE if an appropriate icon could
 *   not be found.
 */
1374
function file_icon_path(File $file, $icon_directory = NULL) {
1375
1376
  // Use the default set of icons if none specified.
  if (!isset($icon_directory)) {
1377
    $icon_directory = config('file.settings')->get('icon.directory');
1378
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1414
  }

  // 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;
}

/**
1415
 * Determines the generic icon MIME package based on a file's MIME type.
1416
 *
1417
 * @param Drupal\file\File $file
1418
 *   A file entity.
1419
 *
1420
1421
1422
 * @return
 *   The generic icon MIME package expected for this file.
 */
1423
function file_icon_map(File $file) {
1424
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15