<?php

/**
 * @file
 * Extend FileField to allow files from multiple sources.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\Component\Utility\NestedArray;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Field\WidgetInterface;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Render\Element;
use Drupal\imce\Imce;

const FILEFIELD_SOURCE_ATTACH_DEFAULT_PATH = 'file_attach';
const FILEFIELD_SOURCE_ATTACH_RELATIVE = 0;
const FILEFIELD_SOURCE_ATTACH_ABSOLUTE = 1;
const FILEFIELD_SOURCE_ATTACH_MODE_MOVE = 'move';
const FILEFIELD_SOURCE_ATTACH_MODE_COPY = 'copy';

const FILEFIELD_SOURCE_REFERENCE_HINT_TEXT = 'example.png [fid:123]';
const FILEFIELD_SOURCE_REMOTE_HINT_TEXT = 'http://example.com/files/file.png';

const FILEFIELD_SOURCE_REFERENCE_MATCH_STARTS_WITH = '0';
const FILEFIELD_SOURCE_REFERENCE_MATCH_CONTAINS = '1';
const FILEFIELD_SOURCE_REFERENCE_SEARCH_ALL_NO = '0';
const FILEFIELD_SOURCE_REFERENCE_SEARCH_ALL_YES = '1';

/**
 * Implements hook_element_info_alter().
 */
function filefield_sources_element_info_alter(&$type) {
  if (isset($type['managed_file'])) {
    $type['managed_file']['#process'][] = 'filefield_sources_field_process';
    $type['managed_file']['#pre_render'][] = 'filefield_sources_field_pre_render';
    $type['managed_file']['#element_validate'][] = 'filefield_sources_field_validate';
    $type['managed_file']['#file_value_callbacks'][] = 'filefield_sources_field_value';
  }
}

/**
 * Implements hook_theme().
 */
function filefield_sources_theme() {
  $theme = array();

  $theme['filefield_sources_element'] = array(
    'render element' => 'element',
    'function' => 'theme_filefield_sources_element',
  );

  $theme['filefield_sources_list'] = array(
    'variables' => array('element' => NULL, 'sources' => NULL),
    'function' => 'theme_filefield_sources_list',
  );

  return $theme;
}

/**
 * Implements hook_field_widget_third_party_settings_form().
 *
 * Add file field sources settings form to supported field widget forms.
 *
 * @see \Drupal\field_ui\FormDisplayOverview
 */
function filefield_sources_field_widget_third_party_settings_form(WidgetInterface $plugin, FieldDefinitionInterface $field_definition, $form_mode, $form, FormStateInterface $form_state) {
  $element = array();
  if (in_array($plugin->getPluginId(), \Drupal::moduleHandler()->invokeAll('filefield_sources_widgets'))) {
    $element = filefield_sources_form($plugin, $form_state);
  }
  return $element;
}

/**
 * Implements hook_field_widget_settings_summary_alter().
 *
 * Add file field sources information to the field widget settings summary.
 *
 * @see \Drupal\field_ui\FormDisplayOverview
 */
function filefield_sources_field_widget_settings_summary_alter(&$summary, $context) {
  $plugin = $context['widget'];
  if (in_array($plugin->getPluginId(), \Drupal::moduleHandler()->invokeAll('filefield_sources_widgets'))) {
    $settings = $plugin->getThirdPartySetting('filefield_sources', 'filefield_sources');
    $enabled_sources = _filefield_sources_enabled($settings);
    $summary[] = t('File field sources:') . ' ' . implode(', ', array_keys($enabled_sources));
  }
}

/**
 * Implements hook_field_widget_form_alter().
 *
 * Add file field sources widget's settings to element.
 */
function filefield_sources_field_widget_form_alter(&$element, FormStateInterface $form_state, $context) {
  $plugin = $context['widget'];
  if (in_array($plugin->getPluginId(), \Drupal::moduleHandler()->invokeAll('filefield_sources_widgets'))) {
    $element['#filefield_sources_settings'] = $plugin->getThirdPartySetting('filefield_sources', 'filefield_sources');

    // Bundle is missing in element.
    $items = $context['items'];
    $element['#bundle'] = $items->getEntity()->bundle();
  }
}

/**
 * Implements hook_filefield_sources_widgets().
 *
 * This returns a list of widgets that are compatible with FileField Sources.
 */
function filefield_sources_filefield_sources_widgets() {
  return array('file_generic', 'image_image');
}

/**
 * Configuration form for editing FileField Sources settings for a widget.
 */
function filefield_sources_form($plugin, FormStateInterface $form_state) {
  $settings = $plugin->getThirdPartySetting('filefield_sources', 'filefield_sources');

  // Backward compatibility: auto-enable 'upload'.
  $enabled = _filefield_sources_enabled($settings);

  $form['filefield_sources'] = array(
    '#type' => 'details',
    '#title' => t('File sources'),
    '#weight' => 20,
  );

  $sources = filefield_sources_list();
  $form['filefield_sources']['sources'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Enabled sources'),
    '#options' => $sources,
    '#default_value' => $enabled,
    '#description' => t('Select the available locations from which this widget may select files.'),
  );

  $params = array($plugin);
  $form['filefield_sources'] = array_merge($form['filefield_sources'], filefield_sources_invoke_all('settings', $params));

  return $form;
}

/**
 * A #process callback to extend the filefield_widget element type.
 *
 * Add the central JavaScript and CSS files that allow switching between
 * different sources. Third-party modules can also add to the list of sources
 * by implementing hook_filefield_sources_info().
 */
function filefield_sources_field_process(&$element, FormStateInterface $form_state, &$complete_form) {
  static $js_added;

  // Check if we are processing file field sources.
  if (!isset($element['#filefield_sources_settings'])) {
    return $element;
  }

  // Do all processing as needed by each source.
  $sources = filefield_sources_info();
  $settings = $element['#filefield_sources_settings'];
  $enabled_sources = _filefield_sources_enabled($settings);

  $context = array(
    'enabled_sources' => &$enabled_sources,
    'element'         => $element,
    'form_state'      => $form_state,
  );

  // Allow other modules to alter the sources.
  \Drupal::moduleHandler()->alter('filefield_sources_sources', $sources, $context);

  foreach ($sources as $source_name => $source) {
    if (empty($enabled_sources[$source_name])) {
      unset($sources[$source_name]);
    }
    // Default upload plugin does not have class.
    elseif (isset($source['class'])) {
      $callback = array($source['class'], 'process');
      if (is_callable($callback)) {
        $element = call_user_func_array($callback, array(
          &$element,
          $form_state,
          &$complete_form,
        ));
      }
    }
  }
  $element['#filefield_sources'] = $sources;

  // Exit out if not adding any sources.
  if (empty($sources)) {
    return $element;
  }

  // Hide default 'upload' type?
  if (!isset($enabled_sources['upload'])) {
    foreach (array('upload_button', 'upload') as $field) {
      if (isset($element[$field])) {
        $element[$field]['#access'] = FALSE;
      }
    }
  }

  // Add class to upload button.
  $element['upload_button']['#attributes']['class'][] = 'upload-button';

  $element['#attached']['library'][] = 'filefield_sources/drupal.filefield_sources';

  // Check the element for hint text that might need to be added.
  foreach (Element::children($element) as $key) {
    if (isset($element[$key]['#filefield_sources_hint_text']) && !isset($js_added[$key])) {
      $type = str_replace('filefield_', '', $key);

      $element['#attached']['drupalSettings']['fileFieldSources'][$type] = array(
        'hintText' => $element[$key]['#filefield_sources_hint_text'],
      );

      $js_added[$key] = TRUE;
    }
  }

  // Adjust the Ajax settings so that on upload and remove of any individual
  // file, the entire group of file fields is updated together.
  // Clone of Drupal\file\Plugin\Field\FieldWidget\FileWidget::process().
  if ($element['#cardinality'] != 1) {
    $parents = array_slice($element['#array_parents'], 0, -1);
    $new_options = array(
      'query' => array(
        'element_parents' => implode('/', $parents),
      ),
    );
    $field_element = NestedArray::getValue($complete_form, $parents);
    $new_wrapper = $field_element['#id'] . '-ajax-wrapper';
    foreach (Element::children($element) as $key) {
      foreach (Element::children($element[$key]) as $subkey) {
        if (isset($element[$key][$subkey]['#ajax'])) {
          $element[$key][$subkey]['#ajax']['options'] = $new_options;
          $element[$key][$subkey]['#ajax']['wrapper'] = $new_wrapper;
          $element[$key][$subkey]['#limit_validation_errors'] = array(
            array_slice($element['#array_parents'], 0, -2),
          );
        }
      }
    }
    unset($element['#prefix'], $element['#suffix']);
  }

  // Add the list of sources to the element for toggling between sources.
  if (empty($element['fids']['#value'])) {
    if (count($enabled_sources) > 1) {
      $element['filefield_sources_list'] = array(
        '#theme' => 'filefield_sources_list',
        '#element' => $element,
        '#sources' => $sources,
        '#weight' => -20,
      );
    }
  }

  return $element;
}

/**
 * A #pre_render function to hide sources if a file is currently uploaded.
 */
function filefield_sources_field_pre_render($element) {
  // If we already have a file, we don't want to show the upload controls.
  if (!empty($element['#value']['fids'])) {
    foreach (Element::children($element) as $key) {
      if (!empty($element[$key]['#filefield_source'])) {
        $element[$key]['#access'] = FALSE;
      }
    }
  }
  return $element;
}

/**
 * An #element_validate function to run source validations.
 */
function filefield_sources_field_validate(&$element, FormStateInterface $form_state, &$complete_form) {
  // Do all processing as needed by each source.
  $sources = filefield_sources_info();
  foreach ($sources as $source) {
    if (!isset($source['class'])) {
      continue;
    }

    $callback = array($source['class'], 'validate');
    if (is_callable($callback)) {
      call_user_func_array($callback, array(
        $element,
        $form_state,
        $complete_form,
      ));
    }
  }
}

/**
 * Form submission handler for all FileField Source buttons.
 *
 * Clone of \Drupal\file\Plugin\Field\FieldWidget\FileWidget::submit(), with
 * a few changes:
 *   - Submit button is one level down compare to 'Upload' source's submit
 *     button.
 *   - Replace static in static::getWidgetState and static::setWidgetState by
 *     WidgetBase.
 *   - Rebuild the form after all.
 */
function filefield_sources_field_submit(&$form, FormStateInterface $form_state) {
  // During the form rebuild, formElement() will create field item widget
  // elements using re-indexed deltas, so clear out FormState::$input to
  // avoid a mismatch between old and new deltas. The rebuilt elements will
  // have #default_value set appropriately for the current state of the field,
  // so nothing is lost in doing this.
  $button = $form_state->getTriggeringElement();
  $parents = array_slice($button['#parents'], 0, -3);
  NestedArray::setValue($form_state->getUserInput(), $parents, NULL);

  // Go one level up in the form, to the widgets container.
  $element = NestedArray::getValue($form, array_slice($button['#array_parents'], 0, -2));
  $field_name = $element['#field_name'];
  $parents = $element['#field_parents'];

  $submitted_values = NestedArray::getValue($form_state->getValues(), array_slice($button['#parents'], 0, -3));
  foreach ($submitted_values as $delta => $submitted_value) {
    if (empty($submitted_value['fids'])) {
      unset($submitted_values[$delta]);
    }
  }

  // If there are more files uploaded via the same widget, we have to separate
  // them, as we display each file in it's own widget.
  $new_values = array();
  foreach ($submitted_values as $delta => $submitted_value) {
    if (is_array($submitted_value['fids'])) {
      foreach ($submitted_value['fids'] as $fid) {
        $new_value = $submitted_value;
        $new_value['fids'] = array($fid);
        $new_values[] = $new_value;
      }
    }
    else {
      $new_value = $submitted_value;
    }
  }

  // Re-index deltas after removing empty items.
  $submitted_values = array_values($new_values);

  // Update form_state values.
  NestedArray::setValue($form_state->getValues(), array_slice($button['#parents'], 0, -3), $submitted_values);

  // Update items.
  $field_state = WidgetBase::getWidgetState($parents, $field_name, $form_state);
  $field_state['items'] = $submitted_values;
  WidgetBase::setWidgetState($parents, $field_name, $form_state, $field_state);

  // We need to rebuild the form, so that uploaded file can be displayed.
  $form_state->setRebuild();
}

/**
 * A #filefield_value_callback to run source value callbacks.
 */
function filefield_sources_field_value(&$element, &$input, FormStateInterface $form_state) {
  // Do all processing as needed by each source.
  $sources = filefield_sources_info();
  foreach ($sources as $source) {
    if (isset($source['class'])) {
      $callback = array($source['class'], 'value');
      if (is_callable($callback)) {
        call_user_func_array($callback, array(&$element, &$input, $form_state));
      }
    }
  }
}

/**
 * Call all FileField Source hooks stored in the available include files.
 */
function filefield_sources_invoke_all($method, &$params) {
  $return = array();
  foreach (\Drupal::service('filefield_sources')->getDefinitions() as $definition) {
    if (!isset($definition['class'])) {
      continue;
    }
    // Get routes defined by each plugin.
    $callback = array($definition['class'], $method);
    if (is_callable($callback)) {
      $result = call_user_func_array($callback, $params);
      if (isset($result) && is_array($result)) {
        $return = array_merge_recursive($return, $result);
      }
      elseif (isset($result)) {
        $return[] = $result;
      }
    }
  }
  return $return;
}

/**
 * Load hook_filefield_sources_info() data from all modules.
 */
function filefield_sources_info($include_default = TRUE) {
  $info = \Drupal::service('filefield_sources')->getDefinitions();
  if (isset($info['imce']) && !Imce::access()) {
    unset($info['imce']);
  }
  if ($include_default) {
    $info['upload'] = array(
      'name' => t('Upload (default)'),
      'label' => t('Upload'),
      'description' => t('Upload a file from your computer.'),
      'weight' => -10,
    );
  }

  uasort($info, '_filefield_sources_sort');

  return $info;
}

/**
 * Create a list of FileField Sources by name, suitable for a select list.
 */
function filefield_sources_list($include_default = TRUE) {
  $info = filefield_sources_info($include_default);
  $list = array();

  foreach ($info as $key => $source) {
    $list[$key] = $source['name'];
  }

  return $list;
}

/**
 * Save a file into the database after validating it.
 *
 * This function is identical to the core function file_save_upload() except
 * that it accepts an input file path instead of an input file source name.
 *
 * @see file_save_upload()
 */
function filefield_sources_save_file($filepath, $validators = array(), $destination = FALSE, $replace = FILE_EXISTS_RENAME) {
  $user = \Drupal::currentUser();

  // Begin building file object.
  $file = entity_create('file', array(
    'uri' => $filepath,
    'uid' => $user->id(),
    'status' => FILE_EXISTS_RENAME,
  ));
  $file->setFilename(trim(basename($filepath), '.'));
  $file->setMimeType(\Drupal::service('file.mime_type.guesser')->guess($file->getFilename()));
  $file->setSize(filesize($filepath));

  $extensions = '';
  if (isset($validators['file_validate_extensions'])) {
    if (isset($validators['file_validate_extensions'][0])) {
      // Build the list of non-munged extensions if the caller provided them.
      $extensions = $validators['file_validate_extensions'][0];
    }
    else {
      // If 'file_validate_extensions' is set and the list is empty then the
      // caller wants to allow any extension. In this case we have to remove the
      // validator or else it will reject all extensions.
      unset($validators['file_validate_extensions']);
    }
  }
  else {
    // No validator was provided, so add one using the default list.
    // Build a default non-munged safe list for file_munge_filename().
    $extensions = 'jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp';
    $validators['file_validate_extensions'] = array();
    $validators['file_validate_extensions'][0] = $extensions;
  }

  if (!empty($extensions)) {
    // Munge the filename to protect against possible malicious extension hiding
    // within an unknown file type (ie: filename.html.foo).
    $file->setFilename(file_munge_filename($file->getFilename(), $extensions));
  }

  // Rename potentially executable files, to help prevent exploits (i.e. will
  // rename filename.php.foo and filename.php to filename.php.foo.txt and
  // filename.php.txt, respectively). Don't rename if 'allow_insecure_uploads'
  // evaluates to TRUE.
  if (!\Drupal::config('system.file')->get('allow_insecure_uploads') && preg_match('/\.(php|pl|py|cgi|asp|js)(\.|$)/i', $file->getFilename()) && (substr($file->getFilename(), -4) != '.txt')) {
    $file->setMimeType('text/plain');
    $file->setFileUri($file->getFileUri() . '.txt');
    $file->setFilename($file->getFilename() . '.txt');
    // The .txt extension may not be in the allowed list of extensions. We have
    // to add it here or else the file upload will fail.
    if (!empty($extensions)) {
      $validators['file_validate_extensions'][0] .= ' txt';
      drupal_set_message(t('For security reasons, your upload has been renamed to %filename.', array('%filename' => $file->getFilename())));
    }
  }

  // If the destination is not provided, use the temporary directory.
  if (empty($destination)) {
    $destination = 'temporary://';
  }

  // Assert that the destination contains a valid stream.
  $destination_scheme = file_uri_scheme($destination);
  if (!$destination_scheme || !file_stream_wrapper_valid_scheme($destination_scheme)) {
    drupal_set_message(t('The file could not be uploaded, because the destination %destination is invalid.', array('%destination' => $destination)), 'error');
    return FALSE;
  }

  // A URI may already have a trailing slash or look like "public://".
  if (substr($destination, -1) != '/') {
    $destination .= '/';
  }

  // Ensure the destination is writable.
  file_prepare_directory($destination, FILE_CREATE_DIRECTORY);

  // Check if this is actually the same file being "attached" to a file record.
  // If so, it acts as a file replace, except no file is actually moved.
  $reuse_file = ($destination . $file->getFilename() === $file->getFileUri());
  if ($reuse_file) {
    $replace = FILE_EXISTS_REPLACE;
  }

  $file->destination = file_destination($destination . $file->getFilename(), $replace);
  // If file_destination() returns FALSE then $replace == FILE_EXISTS_ERROR and
  // there's an existing file so we need to bail.
  if ($file->destination === FALSE) {
    drupal_set_message(t('The file %source could not be uploaded because a file by that name already exists in the destination %directory.', array('%source' => $file->getFilename(), '%directory' => $destination)), 'error');
    return FALSE;
  }

  // Add in our check of the the file name length.
  $validators['file_validate_name_length'] = array();

  // Call the validation functions specified by this function's caller.
  $errors = file_validate($file, $validators);

  // Check for errors.
  if (!empty($errors)) {
    $message = t('The specified file %name could not be uploaded.', array('%name' => $file->getFilename()));
    if (count($errors) > 1) {
      $message .= theme('item_list', array('items' => $errors));
    }
    else {
      $message .= ' ' . array_pop($errors);
    }
    drupal_set_message($message, 'error');
    return FALSE;
  }

  // Move uploaded files from PHP's upload_tmp_dir to Drupal's temporary
  // directory. This overcomes open_basedir restrictions for future file
  // operations.
  $file->setFileUri($file->destination);
  if (!$reuse_file && !file_unmanaged_copy($filepath, $file->getFileUri(), $replace)) {
    drupal_set_message(t('File upload error. Could not move uploaded file.'), 'error');
    \Drupal::logger('filefield_sources')->log(E_NOTICE, 'Upload error. Could not move uploaded file %file to destination %destination.', array('%file' => $file->getFilename(), '%destination' => $file->getFileUri()));
    return FALSE;
  }

  // Set the permissions on the new file.
  drupal_chmod($file->getFileUri());

  // If we are replacing an existing file re-use its database record.
  if ($replace == FILE_EXISTS_REPLACE) {
    $existing_files = file_load_multiple(array(), array('uri' => $file->getFileUri()));
    if (count($existing_files)) {
      $existing = reset($existing_files);
      $file->setOriginalId($existing->id());
    }
  }

  // If we made it this far it's safe to record this file in the database.
  $file->save();
  return $file;
}

/**
 * Clean up the file name, munging extensions and transliterating.
 *
 * @param string $filepath
 *   A string containing a file name or full path. Only the file name will
 *   actually be modified.
 *
 * @return string
 *   A file path with a cleaned-up file name.
 */
function filefield_sources_clean_filename($filepath, $extensions) {
  $filename = basename($filepath);

  if (\Drupal::moduleHandler()->moduleExists('transliteration')) {
    module_load_include('inc', 'transliteration');

    $langcode = NULL;
    if (!empty($_POST['language'])) {
      $languages = language_list();
      $langcode = isset($languages[$_POST['language']]) ? $_POST['language'] : NULL;
    }
    $filename = transliteration_clean_filename($filename, $langcode);
  }

  // Because this transfer mechanism does not use file_save_upload(), we need
  // to manually munge the filename to prevent dangerous extensions.
  // See file_save_upload().
  if (empty($extensions)) {
    $extensions = 'jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp';
  }
  $filename = file_munge_filename($filename, $extensions);
  $directory = drupal_dirname($filepath);
  return ($directory != '.' ? $directory . '/' : '') . $filename;
}

/**
 * Theme the display of the source element.
 */
function theme_filefield_sources_element($variables) {
  $element = $variables['element'];
  $source_id = $element['#source_id'];
  $method = isset($element['#method']) ? $element['#method'] : 'element';
  $extra_variables = isset($element['#variables']) ? $element['#variables'] : array();

  $sources = filefield_sources_info();
  if (isset($sources[$source_id]['class'])) {
    $callback = array($sources[$source_id]['class'], $method);
    if (is_callable($callback)) {
      $variables = array_merge($variables, $extra_variables);
      return call_user_func_array($callback, array($variables));
    }
  }

  return '';
}

/**
 * Theme the display of the sources list.
 */
function theme_filefield_sources_list($variables) {
  $element = $variables['element'];
  $sources = $variables['sources'];

  $links = array();

  foreach ($sources as $name => $source) {
    $links[] = '<a href="#" onclick="return false;" title="' . $source['description'] . '" id="' . $element['#id'] . '-' . $name . '-source" class="filefield-source filefield-source-' . $name . '">' . $source['label'] . '</a>';
  }
  return '<div class="filefield-sources-list">' . implode(' | ', $links) . '</div>';
}

/**
 * Validate a file based on the $element['#upload_validators'] property.
 */
function filefield_sources_element_validate($element, $file, FormStateInterface $form_state) {
  $validators = $element['#upload_validators'];
  $errors = array();

  // Since this frequently is used to reference existing files, check that
  // they exist first in addition to the normal validations.
  if (!file_exists($file->getFileUri())) {
    $errors[] = t('The file does not exist.');
  }
  // Call the validation functions.
  else {
    foreach ($validators as $function => $args) {
      // Add the $file variable to the list of arguments and pass it by
      // reference (required for PHP 5.3 and higher).
      array_unshift($args, NULL);
      $args[0] = &$file;
      $errors = array_merge($errors, call_user_func_array($function, $args));
    }
  }

  // Check for validation errors.
  if (!empty($errors)) {
    $message = t('The selected file %name could not be referenced.', array('%name' => $file->filename));
    if (count($errors) > 1) {
      $message .= '<ul><li>' . implode('</li><li>', $errors) . '</li></ul>';
    }
    else {
      $message .= ' ' . array_pop($errors);
    }
    $form_state->setError($element, $message);
    return 0;
  }

  return 1;
}

/**
 * Generate help text based on the $element['#upload_validators'] property.
 */
function filefield_sources_element_validation_help($validators) {
  $desc = array();
  foreach ($validators as $callback => $arguments) {
    $help_func = $callback . '_help';
    if (function_exists($help_func)) {
      $desc[] = call_user_func_array($help_func, $arguments);
    }
  }
  return empty($desc) ? '' : implode('<br />', $desc);
}

/**
 * Custom sort function for ordering sources.
 */
function _filefield_sources_sort($a, $b) {
  $a = (array) $a + array('weight' => 0, 'label' => '');
  $b = (array) $b + array('weight' => 0, 'label' => '');
  return $a['weight'] < $b['weight'] ? -1 : ($a['weight'] > $b['weight'] ? 1 : strnatcasecmp($a['label'], $b['label']));
}

/**
 * Helper to return enabled sources for a field.
 *
 * This provides backward compatibility for 'upload' type.
 *
 * @see http://drupal.org/node/932994
 */
function _filefield_sources_enabled($settings) {
  if (!isset($settings['sources']['upload'])) {
    $settings['sources']['upload'] = 'upload';
  }

  $enabled = array_keys(array_filter($settings['sources']));
  asort($enabled);
  return array_combine($enabled, $enabled);
}

// @todo Remove once https://www.drupal.org/node/1808132 is finished.
if (!function_exists('module_get_weight')) {
  /**
   * Gets weight of a particular module.
   *
   * @param string $module
   *   The name of the module (without the .module extension).
   *
   * @return int
   *   The configured weight of the module.
   *
   * @throws InvalidArgumentException
   *   Thrown in case the given module is not installed in the system.
   */
  function module_get_weight($module) {
    $weight = \Drupal::config('core.extension')->get("module.$module");
    if ($weight !== NULL) {
      return (int) $weight;
    }
    $weight = \Drupal::config('core.extension')->get("disabled.module.$module");
    if ($weight !== NULL) {
      return (int) $weight;
    }
    throw new InvalidArgumentException(format_string('The module %module is not installed.', array('%module' => $module)));
  }
}

/**
 * Check for CURL extension enabled.
 */
function filefield_sources_curl_enabled() {
  return function_exists('curl_version');
}