Club Drupal

<?php

/**

 * @file

 * Supports file operations including View, Edit, and Delete.

 */

/**

 * Menu callback; view a single file entity.

 */

function file_entity_view_page($file) {

  drupal_set_title($file->filename);

  $uri = entity_uri('file', $file);

  // Set the file path as the canonical URL to prevent duplicate content.

  drupal_add_html_head_link(array('rel' => 'canonical', 'href' => url($uri['path'], $uri['options'])), TRUE);

  // Set the non-aliased path as a default shortlink.

  drupal_add_html_head_link(array('rel' => 'shortlink', 'href' => url($uri['path'], array_merge($uri['options'], array('alias' => TRUE)))), TRUE);

  return file_view($file, 'full');

}

/**

 * Menu callback; download a single file entity.

 */

function file_entity_download_page($file) {

  // Ensure there is a valid token to download this file.

  if (!variable_get('file_entity_allow_insecure_download', FALSE)) {

    if (!isset($_GET['token']) || $_GET['token'] !== file_entity_get_download_token($file)) {

      return MENU_ACCESS_DENIED;

    }

  }

  // If the file does not exist it can cause problems with file_transfer().

  if (!is_file($file->uri)) {

    return MENU_NOT_FOUND;

  }

  // @todo Remove this once drupal_basename is fixed for PHP versions greater

  //  than '5.3.29'.

  $basename_function = version_compare(PHP_VERSION,'5.3.29','>') ? 'basename' : 'drupal_basename';

  $headers = array(

    'Content-Type' => mime_header_encode($file->filemime),

    'Content-Disposition' => 'attachment; filename="' . mime_header_encode($basename_function($file->uri)) . '"',

    'Content-Length' => $file->filesize,

    'Content-Transfer-Encoding' => 'binary',

    'Pragma' => 'no-cache',

    'Cache-Control' => 'must-revalidate, post-check=0, pre-check=0',

    'Expires' => '0',

  );

  // Let other modules alter the download headers.

  drupal_alter('file_download_headers', $headers, $file);

  // Let other modules know the file is being downloaded.

  module_invoke_all('file_transfer', $file->uri, $headers);

  if (file_entity_file_is_local($file)) {

    // For local files, transfer the file and do not reveal the actual URL.

    file_transfer($file->uri, $headers);

  }

  else {

    // For remote files, just redirect the user to that file's actual URL.

    $headers['Location'] = file_create_url($file->uri);

    foreach ($headers as $name => $value) {

      drupal_add_http_header($name, $value);

    }

    drupal_send_headers();

    drupal_exit();

  }

}

/**

 * Form callback for adding a file via an upload form.

 *

 * This is a multi step form which has 1-3 pages:

 * - Upload file

 * - Choose filetype

 *   If there is only one candidate (based on mimetype) we will skip this step.

 * - Edit fields

 *   Skip this step if there are no fields on this entity type.

 */

function file_entity_add_upload($form, &$form_state, $options = array()) {

  if (!is_array($options)) {

    $options = array($options);

  }

  $step = (isset($form_state['step']) && in_array($form_state['step'], array(1, 2, 3, 4))) ? $form_state['step'] : 1;

  $form['#step'] = $step;

  $form['#options'] = $options;

  switch ($step) {

    case 1:

      return file_entity_add_upload_step_upload($form, $form_state, $options);

    case 2:

      return file_entity_add_upload_step_filetype($form, $form_state, $options);

    case 3:

      return file_entity_add_upload_step_scheme($form, $form_state, $options);

    case 4:

      return file_entity_add_upload_step_fields($form, $form_state, $options);

  }

}

/**

 * Generate form fields for the first step in the add file wizard.

 */

function file_entity_add_upload_step_upload($form, &$form_state, array $options = array()) {

  $form['upload'] = array(

    '#type' => 'managed_file',

    '#title' => t('Upload a new file'),

    '#upload_location' => file_entity_upload_destination_uri($options),

    '#upload_validators' => file_entity_get_upload_validators($options),

    '#progress_indicator' => 'bar',

    '#required' => TRUE,

    '#pre_render' => array('file_managed_file_pre_render', 'file_entity_upload_validators_pre_render'),

    '#default_value' => isset($form_state['storage']['upload']) ? $form_state['storage']['upload'] : NULL,

  );

  $form['actions'] = array('#type' => 'actions');

  $form['actions']['next'] = array(

    '#type' => 'submit',

    '#value' => t('Next'),

  );

  form_load_include($form_state, 'inc', 'file_entity', 'file_entity.pages');

  return $form;

}

/**

 * Generate form fields for the second step in the add file wizard.

 */

function file_entity_add_upload_step_filetype($form, &$form_state, array $options = array()) {

  $file = file_load($form_state['storage']['upload']);

  $form['type'] = array(

    '#type' => 'radios',

    '#title' => t('File type'),

    '#options' => file_entity_get_filetype_candidates($file),

    '#default_value' => isset($form_state['storage']['type']) ? $form_state['storage']['type'] : NULL,

    '#required' => TRUE,

  );

  $form['actions'] = array('#type' => 'actions');

  $form['actions']['previous'] = array(

    '#type' => 'submit',

    '#value' => t('Previous'),

    '#limit_validation_errors' => array(),

    '#submit' => array('file_entity_add_upload_submit'),

  );

  $form['actions']['next'] = array(

    '#type' => 'submit',

    '#value' => t('Next'),

  );

  return $form;

}

/**

 * Generate form fields for the third step in the add file wizard.

 */

function file_entity_add_upload_step_scheme($form, &$form_state, array $options = array()) {

  $file = file_load($form_state['storage']['upload']);

  $schemes = array();

  foreach (file_get_stream_wrappers(STREAM_WRAPPERS_WRITE_VISIBLE) as $scheme => $info) {

    $schemes[$scheme] = check_plain($info['description']);

  }

  // Remove any schemes not found in the instance settings.

  if (!empty($options['schemes'])) {

    $schemes = array_intersect_key($schemes, array_flip($options['schemes']));

  }

  // Determine which scheme to use as the default value.

  if (isset($form_state['storage']['scheme'])) {

    $fallback_scheme = $form_state['storage']['scheme'];

  }

  elseif (!empty($options['uri_scheme'])) {

    $fallback_scheme = $options['uri_scheme'];

  }

  else {

    $fallback_scheme = file_default_scheme();

  }

  $form['scheme'] = array(

    '#type' => 'radios',

    '#title' => t('Destination'),

    '#options' => $schemes,

    '#default_value' => $fallback_scheme,

    '#required' => TRUE,

  );

  $form['actions'] = array('#type' => 'actions');

  $form['actions']['previous'] = array(

    '#type' => 'submit',

    '#value' => t('Previous'),

    '#limit_validation_errors' => array(),

    '#submit' => array('file_entity_add_upload_submit'),

  );

  $form['actions']['next'] = array(

    '#type' => 'submit',

    '#value' => t('Next'),

  );

  return $form;

}

/**

 * Generate form fields for the fourth step in the add file wizard.

 */

function file_entity_add_upload_step_fields($form, &$form_state, array $options = array()) {

  // Load the file and overwrite the filetype set on the previous screen.

  $file = file_load($form_state['storage']['upload']);

  $file->type = $form_state['storage']['type'];

  // Let users modify the filename here.

  $form['filename'] = array(

    '#type' => 'textfield',

    '#title' => t('Name'),

    '#default_value' => $file->filename,

    '#required' => TRUE,

    '#maxlength' => 255,

    '#weight' => -10,

  );

  // Add fields.

  field_attach_form('file', $file, $form, $form_state);

  $form['actions'] = array('#type' => 'actions');

  $form['actions']['previous'] = array(

    '#type' => 'submit',

    '#value' => t('Previous'),

    '#limit_validation_errors' => array(),

    '#submit' => array('file_entity_add_upload_submit'),

  );

  $form['actions']['submit'] = array(

    '#type' => 'submit',

    '#value' => t('Save'),

  );

  return $form;

}

/**

 * Page callback to show file usage information.

 */

function file_entity_usage_page($file) {

  $rows = array();

  $occured_entities = array();

  // Determine all of the locations where a file is used, then loop through the

  // occurrences and filter out any duplicates.

  foreach (file_usage_list($file) as $module => $type) {

    foreach ($type as $entity_type => $entity_ids) {

      // There are cases where the actual entity doesn't exist.

      // We have to handle this.

      $entity_info = entity_get_info($entity_type);

      $entities = empty($entity_info) ? NULL : entity_load($entity_type, array_keys($entity_ids));

      foreach ($entity_ids as $entity_id => $count) {

        // If this entity has already been listed in the table, just add any

        // additional usage to the total count column in the table row and

        // continue on to the next iteration of the loop.

        if (isset($occured_entities[$entity_type][$entity_id])) {

          $rows[$occured_entities[$entity_type][$entity_id]][2] += $count;

          continue;

        }

        // Retrieve the label and the URI of the entity.

        $label = empty($entities[$entity_id]) ? $module : entity_label($entity_type, $entities[$entity_id]);

        $entity_uri = empty($entities[$entity_id]) ? NULL : entity_uri($entity_type, $entities[$entity_id]);

        // Link the label to the URI when possible.

        if (!empty($entity_uri['path'])) {

          $entity_label = l($label, $entity_uri['path']);

        }

        else {

          $entity_label = check_plain($label);

        }

        $rows[] = array($entity_label, $entity_type, $count);

        // Record the occurrence of the entity to ensure that it isn't listed in

        // the table again.

        $occured_entities[$entity_type][$entity_id] = count($rows) - 1;

      }

    }

  }

  $header = array(t('Entity'), t('Entity type'), t('Use count'));

  $build['usage_table'] = array(

    '#theme' => 'table',

    '#header' => $header,

    '#rows' => $rows,

    '#caption' => t('This table lists all of the places where @filename is used.', array('@filename' => $file->filename)),

    '#empty' => t('This file is not currently used.'),

  );

  return $build;

}

/**

 * Get the candidate filetypes for a given file.

 *

 * Only filetypes for which the user has access to create entities are returned.

 *

 * @param array $file

 *   An upload file array from form_state.

 *

 * @return array

 *   An array of file type bundles that support the file's mime type.

 */

function file_entity_get_filetype_candidates($file) {

  $types = module_invoke_all('file_type', $file);

  drupal_alter('file_type', $types, $file);

  $candidates = array();

  foreach ($types as $type) {

    $file->type = $type;

    if (file_entity_access('create', $file)) {

      $candidates[$type] = file_entity_type_get_name($file);

    }

  }

  return $candidates;

}

/**

 * Submit handler for the add file form.

 */

function file_entity_add_upload_submit($form, &$form_state) {

  $form_state['storage'] = isset($form_state['storage']) ? $form_state['storage'] : array();

  $form_state['storage'] = array_merge($form_state['storage'], $form_state['values']);

  // This var is set to TRUE when we are ready to save the file.

  $save = FALSE;

  $trigger = $form_state['triggering_element']['#id'];

  $steps_to_check = array(2, 3);

  if ($trigger == 'edit-previous') {

    // If the previous button was hit,

    // the step checking order should be reversed 3, 2.

    $steps_to_check = array_reverse($steps_to_check);

  }

  foreach ($steps_to_check as $step) {

    // Check if we can skip step 2 and 3.

    if (($form['#step'] == $step - 1 && $trigger == 'edit-next') || ($form['#step'] == $step + 1 && $trigger == 'edit-previous')) {

      $file = file_load($form_state['storage']['upload']);

      if ($step == 2) {

        // Check if we can skip step 2.

        $candidates = file_entity_get_filetype_candidates($file);

        if (count($candidates) == 1) {

          $candidates_keys = array_keys($candidates);

          // There is only one possible filetype for this file.

          // Skip the second page.

          $form['#step'] += ($trigger == 'edit-previous') ? -1 : 1;

          $form_state['storage']['type'] = reset($candidates_keys);

        }

        elseif (!$candidates || variable_get('file_entity_file_upload_wizard_skip_file_type', FALSE)) {

          // Do not assign the file a file type.

          $form['#step'] += ($trigger == 'edit-previous') ? -1 : 1;

          $form_state['storage']['type'] = FILE_TYPE_NONE;

        }

      }

      else {

        // Check if we can skip step 3.

        $options = $form['#options'];

        $schemes = file_get_stream_wrappers(STREAM_WRAPPERS_WRITE_VISIBLE);

        // Remove any schemes not found in the instance settings.

        if (!empty($options['schemes'])) {

          $schemes = array_intersect_key($schemes, $options['schemes']);

        }

        if (!file_entity_file_is_writeable($file)) {

          // The file is read-only (remote) and must use its provided scheme.

          $form['#step'] += ($trigger == 'edit-previous') ? -1 : 1;

          $form_state['storage']['scheme'] = file_uri_scheme($file->uri);

        }

        elseif (count($schemes) == 1) {

          // There is only one possible stream wrapper for this file.

          // Skip the third page.

          $form['#step'] += ($trigger == 'edit-previous') ? -1 : 1;

          $form_state['storage']['scheme'] = key($schemes);

        }

        elseif (variable_get('file_entity_file_upload_wizard_skip_scheme', FALSE)) {

          $form['#step'] += ($trigger == 'edit-previous') ? -1 : 1;

          // Fallback to the URI scheme specified in the field settings

          // otherwise use the default file scheme.

          if (!empty($options['uri_scheme'])) {

            $form_state['storage']['scheme'] = $options['uri_scheme'];

          }

          else {

            $form_state['storage']['scheme'] = file_default_scheme();

          }

        }

      }

    }

  }

  // We have the filetype, check if we can skip step 4.

  if (($form['#step'] == 3 && $trigger == 'edit-next')) {

    $file = file_load($form_state['storage']['upload']);

    $form_state['file'] = $file;

    if (!field_info_instances('file', $form_state['storage']['type'])) {

      // This filetype doesn't have fields, save the file.

      $save = TRUE;

    }

    elseif (variable_get('file_entity_file_upload_wizard_skip_fields', FALSE)) {

      // Save the file with blanks fields.

      $save = TRUE;

    }

  }

  // Form id's can vary depending on how many other forms are displayed, so we

  // need to do string comparissons. e.g edit-submit--2.

  if (strpos($trigger, 'edit-next') !== FALSE) {

    $form_state['step'] = $form['#step'] + 1;

  }

  elseif (strpos($trigger, 'edit-previous') !== FALSE) {

    $form_state['step'] = $form['#step'] - 1;

  }

  elseif (strpos($trigger, 'edit-submit') !== FALSE) {

    $save = TRUE;

  }

  if ($save) {

    $file = file_load($form_state['storage']['upload']);

    if ($file) {

      if (file_uri_scheme($file->uri) != $form_state['storage']['scheme']) {

        $file_destination = $form_state['storage']['scheme'] . '://' . file_uri_target($file->uri);

        $file_destination = file_stream_wrapper_uri_normalize($file_destination);

        if ($moved_file = file_move($file, $file_destination, FILE_EXISTS_RENAME)) {

          // Only re-assign the file object if file_move() did not fail.

          $file = $moved_file;

        }

      }

      $file->type = $form_state['storage']['type'];

      $file->display = TRUE;

      // Change the file from temporary to permanent.

      $file->status = FILE_STATUS_PERMANENT;

      // Save the form fields.

      // Keep in mind that the values for the Field API fields must be in

      // $form_state['values'] and not in ['storage']. This is true as long as

      // the fields are on the last page of the multi step form.

      entity_form_submit_build_entity('file', $file, $form, $form_state);

      file_save($file);

      $form_state['file'] = $file;

      drupal_set_message(t('@type %name was uploaded.', array('@type' => file_entity_type_get_name($file), '%name' => $file->filename)));

    }

    else {

      drupal_set_message(t('An error occurred and no file was uploaded.'), 'error');

      return;

    }

    // Figure out destination.

    if (user_access('administer files')) {

      $path = 'admin/content/file';

    }

    else {

      $path = 'file/' . $file->fid;

    }

    $form_state['redirect'] = $path;

  }

  else {

    $form_state['rebuild'] = TRUE;

  }

  // Clear the page and block caches.

  cache_clear_all();

}

/**

 * Determines the upload location for the file add upload form.

 *

 * @param array $params

 *   An array of parameters from the media browser.

 * @param array $data

 *   (optional) An array of token objects to pass to token_replace().

 *

 * @return string

 *   A file directory URI with tokens replaced.

 *

 * @see token_replace()

 */

function file_entity_upload_destination_uri(array $params, array $data = array()) {

  $params += array(

    'uri_scheme' => file_default_scheme(),

    'file_directory' => '',

  );

  $destination = trim($params['file_directory'], '/');

  // Replace tokens.

  $destination = token_replace($destination, $data);

  return $params['uri_scheme'] . '://' . $destination;

}

/**

 * Form for uploading multiple files.

 */

function file_entity_add_upload_multiple($form, &$form_state, $params = array()) {

  $form = file_entity_add_upload($form, $form_state, $params);

  unset($form['upload']['#title']);

  // The validators will be set from plupload anyway. This isn't pretty,

  // but don't allow it to show up twice.

  unset($form['upload']['#description']);

  $form['upload']['#type'] = 'plupload';

  // Ensure that we call the plupload_element_pre_render function.

  // If it isn't called, it doesn't set the JS settings that transfers the

  // list of allowed file extensions to the PLUpload widget.

  // We override the 'file_entity_upload_validators_pre_render' setting if it

  // exists, because both pre-render hooks adds the upload-help with list of

  // allowed file extensions.

  $index = array_search('file_entity_upload_validators_pre_render', $form['upload']['#pre_render']);

  if ($index !== FALSE) {

    $form['upload']['#pre_render'][$index] = 'plupload_element_pre_render';

  }

  else {

    $form['upload']['#pre_render'][] = 'plupload_element_pre_render';

  }

  $form['submit']['#value'] = t('Start upload');

  return $form;

}

/**

 * Submit handler for the multiple upload form.

 */

function file_entity_add_upload_multiple_submit($form, &$form_state) {

  $upload_location = !empty($form['upload']['#upload_location']) ?

    $form['upload']['#upload_location'] . '/' :

    variable_get('file_default_scheme', 'public') . '://';

  // Ensure writable destination directory for the files.

  file_prepare_directory($upload_location, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);

  // We can't use file_save_upload() because of

  // http://www.jacobsingh.name/content/tight-coupling-no-not.

  foreach ($form_state['values']['upload'] as $uploaded_file) {

    if ($uploaded_file['status'] == 'done') {

      $source = $uploaded_file['tmppath'];

      $destination = file_stream_wrapper_uri_normalize($upload_location . $uploaded_file['name']);

      // Rename it to its original name, and put it in its final home.

      // Note - not using file_move here because if we call file_get_mime

      // (in file_uri_to_object) while it has a .tmp extension, it horks.

      $destination = file_unmanaged_move($source, $destination, FILE_EXISTS_RENAME);

      $file = file_uri_to_object($destination);

      $file->status = FILE_STATUS_PERMANENT;

      file_save($file);

      $form_state['files'][$file->fid] = $file;

    }

    else {

      // @todo: move this to element validate or something.

      form_set_error('pud', t('The specified file %name could not be uploaded.', array('%name' => $uploaded_file['name'])));

    }

  }

  // Redirect to the file edit page.

  if (file_entity_access('update', $file) && module_exists('media_bulk_upload')) {

    $destination = array();

    if (isset($_GET['destination'])) {

      $destination = drupal_get_destination();

      unset($_GET['destination']);

    }

    elseif (user_access('administer files')) {

      $destination = array('destination' => 'admin/content/file');

    }

    $form_state['redirect'] = array('admin/content/file/edit-multiple/' . implode(' ', array_keys($form_state['files'])), array('query' => $destination));

  }

  else {

    $form_state['redirect'] = user_access('administer files') ? 'admin/content/file' : '<front>';

  }

  // Clear the page and block caches.

  cache_clear_all();

}

/**

 * Page callback: Form constructor for the file edit form.

 *

 * Path: file/%file/edit

 *

 * @param object $file

 *   A file object from file_load().

 *

 * @see file_entity_menu()

 *

 * @todo Rename this form to file_edit_form to ease into core.

 */

function file_entity_edit($form, &$form_state, $file) {

  drupal_set_title(t('<em>Edit @type</em> @title', array('@type' => $file->type, '@title' => $file->filename)), PASS_THROUGH);

  $form_state['file'] = $file;

  $form['#attributes']['class'][] = 'file-form';

  if (!empty($file->type)) {

    $form['#attributes']['class'][] = 'file-' . $file->type . '-form';

  }

  // Basic file information.

  // These elements are just values so they are not even sent to the client.

  foreach (array('fid', 'type', 'uid', 'timestamp') as $key) {

    $form[$key] = array(

      '#type' => 'value',

      '#value' => isset($file->$key) ? $file->$key : NULL,

    );

  }

  $form['filename'] = array(

    '#type' => 'textfield',

    '#title' => t('Name'),

    '#default_value' => $file->filename,

    '#required' => TRUE,

    '#maxlength' => 255,

    '#weight' => -10,

  );

  // Add a 'replace this file' upload field if the file is writeable.

  if (file_entity_file_is_writeable($file)) {

    // Set up replacement file validation.

    $replacement_options = array();

    // The replacement file must have an extension valid for the original type.

    $file_extensions = array();

    $file_type_name = isset($file->type) ? $file->type : file_get_type($file);

    if ($file_type_name && ($file_type = file_type_load($file_type_name))) {

      $file_extensions = file_type_get_valid_extensions($file_type);

    }

    // Set allowed file extensions.

    if (!empty($file_extensions)) {

      // Set to type based file extensions.

      $replacement_options['file_extensions'] = implode(' ', $file_extensions);

    }

    else {

      // Fallback to the extension of the current file.

      $replacement_options['file_extensions'] = pathinfo($file->uri, PATHINFO_EXTENSION);

    }

    $form['replace_upload'] = array(

      '#type' => 'file',

      '#title' => t('Replace file'),

      '#description' => t('This file will replace the existing file. This action cannot be undone.'),

      '#upload_validators' => file_entity_get_upload_validators($replacement_options),

      '#pre_render' => array('file_entity_upload_validators_pre_render'),

    );

  }

  $form['preview'] = file_view_file($file, 'preview');

  $form['additional_settings'] = array(

    '#type' => 'vertical_tabs',

    '#weight' => 99,

  );

  // File destination information for administrators.

  $form['destination'] = array(

    '#type' => 'fieldset',

    '#access' => user_access('administer files') && file_entity_file_is_writeable($file),

    '#title' => t('Destination'),

    '#collapsible' => TRUE,

    '#collapsed' => TRUE,

    '#group' => 'additional_settings',

    '#attributes' => array(

      'class' => array('file-form-destination'),

    ),

    '#attached' => array(

      'js' => array(

        drupal_get_path('module', 'file_entity') . '/file_entity.js',

      ),

    ),

  );

  $options = array();

  foreach (file_get_stream_wrappers(STREAM_WRAPPERS_WRITE_VISIBLE) as $scheme => $info) {

    $options[$scheme] = check_plain($info['name']);

  }

  $form['destination']['scheme'] = array(

    '#type' => 'radios',

    '#title' => t('Destination'),

    '#options' => $options,

    '#default_value' => file_uri_scheme($file->uri),

  );

  // File user information for administrators.

  $form['user'] = array(

    '#type' => 'fieldset',

    '#access' => user_access('administer files'),

    '#title' => t('User information'),

    '#collapsible' => TRUE,

    '#collapsed' => TRUE,

    '#group' => 'additional_settings',

    '#attributes' => array(

      'class' => array('file-form-user'),

    ),

    '#attached' => array(

      'js' => array(

        drupal_get_path('module', 'file_entity') . '/file_entity.js',

        array(

          'type' => 'setting',

          'data' => array('anonymous' => variable_get('anonymous', t('Anonymous'))),

        ),

      ),

    ),

    '#weight' => 90,

  );

  $form['user']['name'] = array(

    '#type' => 'textfield',

    '#title' => t('Associated with'),

    '#maxlength' => 60,

    '#autocomplete_path' => 'user/autocomplete',

    '#default_value' => !empty($file->uid) ? user_load($file->uid)->name : '',

    '#weight' => -1,

    '#description' => t('Leave blank for %anonymous.', array('%anonymous' => variable_get('anonymous', t('Anonymous')))),

  );

  // Add the buttons.

  $form['actions'] = array('#type' => 'actions');

  $form['actions']['submit'] = array(

    '#type' => 'submit',

    '#value' => t('Save'),

    '#weight' => 5,

    '#submit' => array('file_entity_edit_submit'),

    '#validate' => array('file_entity_edit_validate'),

  );

  $form['actions']['delete'] = array(

    '#type' => 'submit',

    '#value' => t('Delete'),

    '#weight' => 10,

    '#submit' => array('file_entity_edit_delete_submit'),

    '#access' => file_entity_access('delete', $file),

  );

  // Build the URL for the cancel button taking into account that there might be

  // a "destination" that includes query string variables.

  $parameters = drupal_get_query_parameters();

  $destination = isset($parameters['destination']) ? $parameters['destination'] : 'file/' . $file->fid;

  $url = drupal_parse_url($destination);

  $form['actions']['cancel'] = array(

    '#type' => 'link',

    '#title' => t('Cancel'),

    '#href' => $url['path'],

    '#options' => array('query' => $url['query']),

    '#weight' => 15,

  );

  $langcode = function_exists('entity_language') ? entity_language('file', $file) : NULL;

  field_attach_form('file', $file, $form, $form_state, $langcode);

  return $form;

}

/**

 * Form validation handler for file_entity_edit().

 */

function file_entity_edit_validate($form, &$form_state) {

  $file = (object) $form_state['values'];

  // Validate the "associated user" field.

  if (!empty($file->name) && !($account = user_load_by_name($file->name))) {

    // The use of empty() is mandatory in the context of usernames

    // as the empty string denotes the anonymous user. In case we

    // are dealing with an anonymous user we set the user ID to 0.

    form_set_error('name', t('The username %name does not exist.', array('%name' => $file->name)));

  }

  // Handle the replacement file if uploaded.

  if (isset($form_state['values']['replace_upload'])) {

    // Save the file as a temporary file.

    $file = file_save_upload('replace_upload', $form['replace_upload']['#upload_validators']);

    if (!empty($file)) {

      // Put the temporary file in form_values so we can save it on submit.

      $form_state['values']['replace_upload'] = $file;

    }

    elseif ($file === FALSE) {

      // File uploaded failed.

      form_set_error('replace_upload', t('The replacement file could not be uploaded.'));

    }

  }

  // Run entity form validation.

  entity_form_field_validate('file', $form, $form_state);

}

/**

 * Form submission handler for the 'Save' button for file_entity_edit().

 */

function file_entity_edit_submit($form, &$form_state) {

  $file = $form_state['file'];

  $orphaned_uri = '';

  // Check if a replacement file has been uploaded.

  if (!empty($form_state['values']['replace_upload'])) {

    $replacement = $form_state['values']['replace_upload'];

    // Move file from temp to permanent home.

    if (pathinfo($replacement->uri, PATHINFO_EXTENSION) == pathinfo($file->uri, PATHINFO_EXTENSION)) {

        file_unmanaged_copy($replacement->uri, $file->uri, FILE_EXISTS_REPLACE);

    } else {

      $destination_uri = rtrim($file->uri, drupal_basename($file->uri)) . drupal_basename($replacement->uri);

      $replace_mode = $destination_uri == $file->uri ? FILE_EXISTS_REPLACE : FILE_EXISTS_RENAME;

      if ($new_file_uri = file_unmanaged_copy($replacement->uri, $destination_uri, $replace_mode)) {

        // @todo Add watchdog() about replaced file here?

        // Remove temporary file.

        file_delete($replacement);

        // Update if the uri target has changed.

        if ($new_file_uri != $file->uri) {

         // Store the original file uri to delete if save is successful.

         $orphaned_uri = $file->uri;

          // Update file entity uri.

          $file->uri = $new_file_uri;

        }

      }

    }

  }

  // Run entity form submit handling and save the file.

  entity_form_submit_build_entity('file', $file, $form, $form_state);

  // A user might assign the associated user by entering a user name in the file

  // edit form, which we then need to translate to a user ID.

  if (isset($file->name)) {

    // The use of isset() is mandatory in the context of user IDs, because

    // user ID 0 denotes the anonymous user.

    if ($user = user_load_by_name($file->name)) {

      $file->uid = $user->uid;

    }

    else {

      // Anonymous user.

      $file->uid = 0;

    }

  }

  elseif ($file->uid) {

    $user = user_load($file->uid);

    $file->name = $user->name;

  }

  if (file_uri_scheme($file->uri) != $form_state['values']['scheme']) {

    $file_destination = $form_state['values']['scheme'] . '://' . file_uri_target($file->uri);

    $file_destination = file_stream_wrapper_uri_normalize($file_destination);

    if ($moved_file = file_move($file, $file_destination, FILE_EXISTS_RENAME)) {

      // Only re-assign the file object if file_move() did not fail.

      $file = $moved_file;

    }

  }

  file_save($file);

  $args = array(

    '@type' => file_entity_type_get_name($file),

    '%title' => entity_label('file', $file),

  );

  watchdog('file', '@type: updated %title.', $args);

  drupal_set_message(t('@type %title has been updated.', $args));

  // Clean up orphaned file.

  if (!empty($orphaned_uri)) {

    file_unmanaged_delete($orphaned_uri);

    $args['@orphaned'] = file_uri_target($orphaned_uri);

    watchdog('file', '@type: deleted orphaned file @orphaned for %title.', $args);

    drupal_set_message(t('The replaced @type @orphaned has been deleted.', $args));

  }

  $form_state['redirect'] = 'file/' . $file->fid;

  // Clear the page and block caches.

  cache_clear_all();

}

/**

 * Form submission handler for the 'Delete' button for file_entity_edit().

 */

function file_entity_edit_delete_submit($form, &$form_state) {

  $fid = $form_state['values']['fid'];

  $destination = array();

  if (isset($_GET['destination'])) {

    $destination = drupal_get_destination();

    unset($_GET['destination']);

  }

  $form_state['redirect'] = array('file/' . $fid . '/delete', array('query' => $destination));

  // Clear the page and block caches.

  cache_clear_all();

}

/**

 * Page callback: Form constructor for the file deletion confirmation form.

 *

 * Path: file/%file/delete

 *

 * @param object $file

 *   A file object from file_load().

 *

 * @see file_entity_menu()

 */

function file_entity_delete_form($form, &$form_state, $file) {

  $form_state['file'] = $file;

  $form['fid'] = array(

    '#type' => 'value',

    '#value' => $file->fid,

  );

  $description = t('This action cannot be undone.');

  if ($references = file_usage_list($file)) {

    $description .= ' ' . t('This file is currently in use and may cause problems if deleted.');

  }

  return confirm_form($form,

    t('Are you sure you want to delete the file %title?', array(

      '%title' => entity_label('file', $file),

    )),

    'file/' . $file->fid,

    $description,

    t('Delete')

  );

}

/**

 * Form submission handler for file_entity_delete_form().

 */

function file_entity_delete_form_submit($form, &$form_state) {

  if ($form_state['values']['confirm'] && $file = file_load($form_state['values']['fid'])) {

    // Use file_delete_multiple() rather than file_delete() since we want to

    // avoid unwanted validation and usage checking.

    file_delete_multiple(array($file->fid));

    $args = array(

      '@type' => file_entity_type_get_name($file),

      '%title' => entity_label('file', $file),

    );

    watchdog('file', '@type: deleted %title.', $args);

    drupal_set_message(t('@type %title has been deleted.', $args));

  }

  $form_state['redirect'] = '<front>';

  // Clear the page and block caches.

  cache_clear_all();

}

/**

 * Form constructor for file deletion confirmation form.

 *

 * @param array $files

 *   An array of file objects.

 */

function file_entity_multiple_delete_form($form, &$form_state, array $files) {

  $form['files'] = array(

    '#prefix' => '<ul>',

    '#suffix' => '</ul>',

    '#tree' => TRUE,

  );

  $files_have_usage = FALSE;

  foreach ($files as $fid => $file) {

    $title = entity_label('file', $file);

    $usage = file_usage_list($file);

    if (!empty($usage)) {

      $files_have_usage = TRUE;

      $title = t('@title (in use)', array('@title' => $title));

    }

    else {

      $title = check_plain($title);

    }

    $form['files'][$fid] = array(

      '#type' => 'hidden',

      '#value' => $fid,

      '#prefix' => '<li>',

      '#suffix' => $title . "</li>\n",

    );

  }

  $form['operation'] = array(

    '#type' => 'hidden',

    '#value' => 'delete',

  );

  $description = t('This action cannot be undone.');

  if ($files_have_usage) {

    $description .= ' ' . t('Some of the files are currently in use and may cause problems if deleted.');

  }

  return confirm_form(

    $form,

    format_plural(count($files), 'Are you sure you want to delete this file?', 'Are you sure you want to delete these files?'),

    'admin/content/file',

    $description,

    t('Delete')

  );

}

/**

 * Form submission handler for file_entity_multiple_delete_form().

 */

function file_entity_multiple_delete_form_submit($form, &$form_state) {

  if ($form_state['values']['confirm'] && $fids = array_keys($form_state['values']['files'])) {

    file_delete_multiple($fids);

    $count = count($fids);

    watchdog('file', 'Deleted @count files.', array('@count' => $count));

    drupal_set_message(format_plural($count, 'Deleted one file.', 'Deleted @count files.'));

  }

  $form_state['redirect'] = 'admin/content/file';

  // Clear the page and block caches.

  cache_clear_all();

}

/**

 * Page callback for the file edit form.

 *

 * @deprecated

 *   Use drupal_get_form('file_entity_edit')

 */

function file_entity_page_edit($file) {

  return drupal_get_form('file_entity_edit', $file);

}

/**

 * Page callback for the file deletion confirmation form.

 *

 * @deprecated

 *   Use drupal_get_form('file_entity_delete_form')

 */

function file_entity_page_delete($file) {

  return drupal_get_form('file_entity_delete_form');

}

/**

 * Retrieves the upload validators for a file.

 *

 * @param array $options

 *   (optional) An array of options for file validation.

 *

 * @return array

 *   An array suitable for passing to file_save_upload() or for a managed_file

 *   or upload element's '#upload_validators' property.

 */

function file_entity_get_upload_validators(array $options = array()) {

  // Set up file upload validators.

  $validators = array();

  // Validate file extensions. If there are no file extensions in $params and

  // there are no Media defaults, there is no file extension validation.

  if (!empty($options['file_extensions'])) {

    $validators['file_validate_extensions'] = array($options['file_extensions']);

  }

  else {

    $validators['file_validate_extensions'] = array(variable_get('file_entity_default_allowed_extensions', 'jpg jpeg gif png txt doc docx xls xlsx pdf ppt pptx pps ppsx odt ods odp mp3 mov mp4 m4a m4v mpeg avi ogg oga ogv weba webp webm'));

  }

  // Cap the upload size according to the system or user defined limit.

  $max_filesize = parse_size(file_upload_max_size());

  $file_entity_max_filesize = parse_size(variable_get('file_entity_max_filesize', ''));

  // If the user defined a size limit, use the smaller of the two.

  if (!empty($file_entity_max_filesize)) {

    $max_filesize = min($max_filesize, $file_entity_max_filesize);

  }

  if (!empty($options['max_filesize']) && $options['max_filesize'] < $max_filesize) {

    $max_filesize = parse_size($options['max_filesize']);

  }

  // There is always a file size limit due to the PHP server limit.

  $validators['file_validate_size'] = array($max_filesize);

  // Add image validators.

  $options += array('min_resolution' => 0, 'max_resolution' => 0);

  if ($options['min_resolution'] || $options['max_resolution']) {

    $validators['file_validate_image_resolution'] = array($options['max_resolution'], $options['min_resolution']);

  }

  // Add other custom upload validators from options.

  if (!empty($options['upload_validators'])) {

    $validators += $options['upload_validators'];

  }

  return $validators;

}

function file_entity_upload_archive_form($form, &$form_state) {

  $options = array(

    'file_extensions' => archiver_get_extensions(),

  );

  $form['upload'] = array(

    '#type' => 'managed_file',

    '#title' => t('Upload an archive file'),

    '#upload_location' => NULL, // Upload to the temporary directory.

    '#upload_validators' => file_entity_get_upload_validators($options),

    '#progress_indicator' => 'bar',

    '#required' => TRUE,

    '#pre_render' => array('file_managed_file_pre_render', 'file_entity_upload_validators_pre_render'),

  );

  $form['pattern'] = array(

    '#type' => 'textfield',

    '#title' => t('Pattern'),

    '#description' => t('Only files matching this pattern will be imported. For example, to import all jpg and gif files, the pattern would be <em>*.jpg|*.gif</em>. Use <em>.*</em> to extract all files in the archive.'),

    '#default_value' => '.*',

    '#required' => TRUE,

  );

  $form['actions'] = array('#type' => 'actions');

  $form['actions']['submit'] = array(

    '#type' => 'submit',

    '#value' => t('Submit'),

  );

  form_load_include($form_state, 'inc', 'file_entity', 'file_entity.pages');

  return $form;

}

/**

 * Upload a file.

 */

function file_entity_upload_archive_form_submit($form, &$form_state) {

  $form_state['files'] = array();

  if ($archive = file_load($form_state['values']['upload'])) {

    if ($archiver = archiver_get_archiver($archive->uri)) {

      $files = $archiver->listContents();

      $extract_dir = file_default_scheme() . '://' . pathinfo($archive->filename, PATHINFO_FILENAME);

      $extract_dir = file_destination($extract_dir, FILE_EXISTS_RENAME);

      if (!file_prepare_directory($extract_dir, FILE_MODIFY_PERMISSIONS | FILE_CREATE_DIRECTORY)) {

        throw new Exception(t('Unable to prepar, e directory %dir for extraction.', array('%dir' => $extract_dir)));

      }

      $archiver->extract($extract_dir);

      $pattern = '/' . $form_state['values']['pattern'] . '/';

      if ($files = file_scan_directory($extract_dir, $pattern)) {

        foreach ($files as $file) {

          $file->status = FILE_STATUS_PERMANENT;

          $file->uid = $archive->uid;

          file_save($file);

          $form_state['files'][$file->fid] = $file;

        }

      }

      drupal_set_message(t('Extracted %file and added @count new files.', array('%file' => $archive->filename, '@count' => count($files))));

    }

    else {

      throw new Exception(t('Cannot extract %file, not a valid archive.', array('%file' => $archive->uri)));

    }

  }

  // Redirect to the file edit page.

  if (file_entity_access('edit') && module_exists('multiform')) {

    $destination = array('destination' => 'admin/content/file');

    if (isset($_GET['destination'])) {

      $destination = drupal_get_destination();

      unset($_GET['destination']);

    }

    $form_state['redirect'] = array('admin/content/file/edit-multiple/' . implode(' ', array_keys($form_state['files'])), array('query' => $destination));

  }

  else {

    $form_state['redirect'] = 'admin/content/file';

  }

}