<?php
// $Id$

/**
 * @file
 * Defines a file field type.
 *
 * uses content.module to store the fid, and the drupal files 
 * table to store the actual file data.
 */


function filefield_menu($may_cache) {
  $items = array();

  if ($may_cache) {
    $items[] = array(
      'path' => 'filefield/js',
      'callback' => 'filefield_js',
      //'access' => user_access(),
      'access' => TRUE,
      'type' => MENU_CALLBACK
    );
  }
  else if ($_SESSION['filefield']) {
    // Add handlers for previewing new uploads.
    foreach ($_SESSION['filefield'] as $fieldname => $files) {
      if (is_array($files)) {
        foreach($files as $delta => $file) {
          if ($file['preview']) {
            $items[] = array(
              'path' => $file['preview'],
              'callback' => '_filefield_preview',
              'access' => TRUE,
              'type' => MENU_CALLBACK
            );
          }
        }
      }
    }
  }
  return $items;
}

/**
 *  transfer a file that is in a 'preview' state.
 *  @todo  multiple support
 */
function _filefield_preview() {
  foreach ($_SESSION['filefield'] as $fieldname => $files) {
    foreach ($files as $delta => $file) {
      if ($file['preview'] == $_GET['q']) {
        file_transfer($file['filepath'], array('Content-Type: '. mime_header_encode($file['filemime']),
                                           'Content-Length: '. $file['filesize']));
        exit();
      }
    }
  }
}

function filefield_perm() {
  return array('view filefield uploads');
}

/**
 * Implementation of hook_field_info().
 */
function filefield_field_info() {
  return array(
    'file' => array('label' => 'File'),
  );
}

/**
 * Implementation of hook_field_settings().
 */
function filefield_field_settings($op, $field) {
  switch ($op) {
    case 'form':
      $form = array();
      $form['force_list'] = array(
        '#type' => 'checkbox',
        '#title' => t('Always list files'),
        '#default_value' => isset($field['force_list']) ? $field['force_list'] : 0,
        '#description' => t('If enabled, the "List" checkbox will be hidden and files are always shown. Otherwise, the user can choose for each file whether it should be listed or not.'),
      );
      return $form;

    case 'validate':
      break;

    case 'save':
      return array('force_list');

    case 'database columns':
      $columns = array(
        'fid' => array('type' => 'int', 'not null' => TRUE, 'default' => '0'),
        'description' => array('type' => 'varchar', length => 255, 'not null' => TRUE, 'default' => "''", 'sortable' => TRUE),
        'list' => array('type' => 'int', 'not null' => TRUE, 'default' => '0'),
      );
      return $columns;

    case 'filters':
      return array(
        'not null' => array(
          'operator' => array('=' => t('Has Image')),
          'list' => 'views_handler_operator_yesno',
          'list-type' => 'select',
          'handler' => 'filefield_views_handler_filter_is_not_null',
        ),
      );  

  }
}

function filefield_default_item() {
  return array(
    'fid' => 0,
    'description' => '',
    'list' => 0,
  );
}

/**
 * insert a file into the database.
 * @param $node
 *    node object file will be associated with.
 * @param $file
 *    file to be inserted, passed by reference since fid should be attached.
 *    
 */
function filefield_file_insert($node, $field, &$file) {
  $fieldname = $field['field_name'];
  
  // allow tokenized paths.
  if (function_exists('token_replace')) {
    global $user;
    $widget_file_path = token_replace($field['widget']['file_path'], 'user', $user);
  }
  else {
    $widget_file_path = $field['widget']['file_path'];
  }
 
  $filepath = file_create_path($widget_file_path) . '/' . $file['filename'];
  
  if (filefield_check_directory($widget_file_path) && $file = file_save_upload((object)$file, $filepath)) {
    $file = (array)$file;
    $file['fid'] = db_next_id('{files}_fid');
    $file['filemime'] = mimedetect_mime($file);
    db_query('INSERT into {files} (fid, nid, filename, filepath, filemime, filesize)  
             VALUES (%d, %d, "%s","%s","%s",%d)',
            $file['fid'], $node->nid, $file['filename'], $file['filepath'], $file['filemime'], $file['filesize']);
    module_invoke_all('filefield', 'file_save', $node, $field, $file);
    return (array)$file;
  }
  else {
    // Include file name in upload error.
    form_set_error(NULL, t('File upload was unsuccessful.'));
    return FALSE;
  }
}


/**
 * update the file record if necessary
 * @param $node
 * @param $file
 * @param $field
 */
function filefield_file_update($node, $field, &$file) {
  $file = (array)$file; 
  if ($file['delete'] == TRUE) {
     module_invoke_all('filefield', 'file_delete', $node, $field, $file);
     _filefield_file_delete($node, $field, $file);
     return array();
  }
  if ($file['fid'] == 'upload') {  
    return filefield_file_insert($node, $field, $file);
  }
  else {
    // if fid is not numeric here we should complain.
    // else we update the file table.  
  }
  return $file;
}

/**
 * Implementation of hook_field().
 */
function filefield_field($op, &$node, $field, &$items, $teaser, $page) {
  $fieldname = $field['field_name'];
  switch ($op) {
    // called after content.module loads default data.
    case 'load':
      if (is_array($items)) {
        $items = array_filter($items); // drop empty deltas, cuz cck sends 'em some times.
      }
      if (empty($items)) {
        return array();
      }
      foreach ($items as $delta => $item) {
        if (!empty($item['fid'])) { // otherwise, merge our info with CCK's, and all is fine.
          $items[$delta] = array_merge($item, _filefield_file_load($item['fid']));
        }
      }
      $items = array_values($items); // compact deltas
      return array($fieldname => $items);

    // called before content.module defaults.
    case 'insert':
      foreach ($items as $delta => $item) {
        $items[$delta] = filefield_file_insert($node, $field, $item);
      }
      $items = array_values($items); // compact deltas
      filefield_clear_field_session($fieldname);
      break;

    // called before content.module defaults.
    case 'update':
      foreach ($items as $delta => $item) {
        $items[$delta] = filefield_file_update($node, $field, $item);
      }
      $items = array_filter($items); // unset empty items.
      $items = array_values($items); // compact deltas
      filefield_clear_field_session($fieldname);
      break;

    case 'delete':
      foreach ($items as $delta => $item) {
        _filefield_file_delete($node, $field, $item); 
      }
      break;
  }
}

/**
 * Implementation of hook_widget_info().
 */
function filefield_widget_info() {
  return array(
    'file' => array(
      'label' => 'File',
      'field types' => array('file'),
    ),
  );
}

/**
 * Implementation of hook_widget_settings().
 */
function filefield_widget_settings($op, $widget) {
  switch ($op) {
    case 'callbacks':
      return array('default value' => CONTENT_CALLBACK_CUSTOM);

    case 'form':
      $form = array();
      $form['file_extensions'] = array (
        '#type' => 'textfield',
        '#title' => t('Permitted upload file extensions'),
        '#default_value' => isset($widget['file_extensions']) ? $widget['file_extensions'] : 'txt',
        '#size' => 64,
        '#description' => t('Extensions a user can upload to this field. Separate extensions with a space and do not include the leading dot. Leaving this blank will allow users to upload a file with any extension.'),
      );
      $form['file_path'] = array(
        '#type' => 'textfield', 
        '#title' => t('File path'), 
        '#default_value' => $widget['file_path'] ? $widget['file_path'] : '', 
        '#description' => t('Optional subdirectory within the "%dir" directory where files will be stored. Do not include trailing slash.', array('%dir' => variable_get('file_directory_path', 'files'))), 
      );
      if (function_exists('token_replace')) {
        $form['file_path']['#description'] .= theme('token_help', 'user');        
      }
      return $form;
    case 'validate':
      break;
    case 'save':
      return array('file_extensions', 'file_path');
  }
}


function filefield_clear_session() {
  if (is_array($_SESSION['filefield']) && count($_SESSION['filefield'])) {
    foreach (array_keys($_SESSION['filefield']) as $fieldname) {
      filefield_clear_field_session($fieldname);
    }
    unset($_SESSION['filefield']);
  }
}

function filefield_clear_field_session($fieldname) {
  if (is_array($_SESSION['filefield'][$fieldname]) && count($_SESSION['filefield'][$fieldname])) {
    foreach ($_SESSION['filefield'][$fieldname] as $delta => $file) {
      if (is_file($file['filepath'])) {
        file_delete($file['filepath']);
      }
    }
    unset($_SESSION['filefield'][$fieldname]);
  }
}

function _filefield_file_delete($node, $field, $file) {
  if (is_numeric($file['fid'])) {
    db_query('DELETE FROM {files} WHERE fid = %d', $file['fid']);
  }
  else {
    unset($_SESSION['filefield'][$field['field_name']][$file['sessionid']]);
  }
  module_invoke_all('filefield', 'delete', $node, $field, $file);
  return file_delete($file['filepath']);
}

/**
 * Implementation of hook_widget().
 */
function filefield_widget($op, $node, $field, &$items) {
  $fieldname = $field['field_name'];
  switch ($op) {
    case 'default value':
      return array();

    case 'prepare form values':
      _filefield_widget_prepare_form_values($node, $field, $items);
      break;

    case 'form':
      return  _filefield_widget_form($node, $field, $items);

    case 'validate':
      _filefield_widget_validate($node, $field, $items);
      break;
  }
}

function _filefield_widget_prepare_form_values($node, $field, &$items) {
  $fieldname = $field['field_name'];
  // @todo split this into its own function. determine if we can make it a form element.
  if (!count($_POST)) {
    filefield_clear_session();
  }
  // Attach new files 
  if ($file = file_check_upload($fieldname . '_upload')) {
    $file = (array)$file;
    // test allowed extensions. We do this when the file is uploaded, rather than waiting for the
    // field itseld to reach op==validate.
    $last_ext = array_pop(explode('.', $file['filename']));
    $valid = TRUE;
    // only check extensions if there extensions to check.
    // @todo: trim & strtolower file_extenstions with a formapi validate callback.
    if (strlen(trim($field['widget']['file_extensions']))) {
      $allowed_extensions = array_unique(explode(' ', strtolower(trim($field['widget']['file_extensions']))));
      $ext = array_pop(explode('.', strtolower($file['filename'])));
      if (!in_array($ext, $allowed_extensions)) {
        $valid = FALSE;
        form_set_error($field['field_name'] .'_upload', t('Files with the extension %ext are not allowed. Please upload a file with an extension from the following list: %allowed_extensions', array('%ext' => $last_ext, '%allowed_extensions' => $field['widget']['file_extensions'])));
      }
    }
    // let extended validation from other module happen so we get all error messages.
    // if you implement hook_filefield_file() return FALSE to stop the upload.
    if (!$valid || in_array(FALSE, module_invoke_all('filefield', 'file_validate', $node, $field, $file))) {
      return FALSE;
    }
    // let modules massage act on the file.
    foreach(module_implements('filefield') as $module) {
      $function =  $module .'_filefield';
      $function('file_prepare', $node, $field, $file);
    }

    $filepath = file_create_filename($file['filename'], file_create_path($field['widget']['file_path']));
    if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PRIVATE) {
      if (strpos($filepath, file_directory_path()) !== FALSE) {
        $filepath = trim(substr($filepath, strlen(file_directory_path())), '\\/');
      }
      $filepath = 'system/files/'. $filepath;
    };

    // prepare file array. 
    $file['fid'] = 'upload';
    $file['preview'] = $filepath;

    // if this is a single value filefield mark any other files for deletion.
    if (!$field['multiple']) {
      if (is_array($items)) {
        foreach($items as $delta => $session_file) {
          $items[$delta]['delete'] = TRUE;
        }
      }
      // Remove old temporary file from session.
      filefield_clear_field_session($fieldname);
    }
    $file_id = count($items) + count($_SESSION['filefield'][$fieldname]);
    $_SESSION['filefield'][$fieldname][$file_id] = $file;
  }
      
  // Load files from preview state. before committing actions.
  if (!empty($_SESSION['filefield'][$fieldname])) {
    foreach($_SESSION['filefield'][$fieldname] as $delta => $file) {
      $items[] = $file;
    }
  }
}

function _filefield_widget_form($node, $field, &$items) {
  drupal_add_js('misc/progress.js');
  drupal_add_js('misc/upload.js');
  drupal_add_js(drupal_get_path('module', 'filefield') .'/filefield.js');


  $fieldname = $field['field_name'];
  drupal_add_css(drupal_get_path('module', 'filefield') .'/filefield.css');
 
  $form = array(); 
  $form[$fieldname] = array(
    '#type' => 'fieldset',
    '#title' => t($field['widget']['label']),
    '#description' => t('Changes made to the attachments are not permanent until you save this post.'),
    '#weight' => $field['widget']['weight'],
    '#collapsible' => TRUE,
    '#collapsed' => FALSE,
    '#tree' => TRUE,
    '#prefix' => '<div id="'. form_clean_id($fieldname .'-attach-wrapper') .'">',
    '#suffix' => '</div>',
  );

  $form[$fieldname]['new'] = array(
    '#tree' => FALSE,
    '#prefix' => '<div id="'. form_clean_id($fieldname .'-attach-hide') .'">',
    '#suffix' => '</div>',
    '#weight' => 100,
  );

  $extensions_description = empty($field['widget']['file_extensions'])
    ? ''
    : t('<br />Allowed extensions: %ext', array('%ext' => $field['widget']['file_extensions']));

  // Separate from tree becase of that silly things won't be displayed
  // if they are a child of '#type' = form issue
  $form[$fieldname]['new'][$fieldname .'_upload'] = array(
    '#type'  => 'file',
    '#title' => t('Attach new file'),
    '#description' => $field['widget']['description'] . $extensions_description,
    '#weight' => 9,
    '#tree' => FALSE,
    '#attributes' => array('accept' => str_replace(' ', '|', trim($field['widget']['file_extensions']))),
  );

  $form[$fieldname]['new']['upload'] = array(
    '#type' => 'button',
    '#value' => t('Upload'),
    '#name' => 'cck_filefield_'. $fieldname .'_op',
    '#id' => form_clean_id($fieldname .'-attach-button'),
    '#tree' => FALSE,
    '#weight' => 10,
  );

  if (is_array($items) && count($items)) {
    $form[$fieldname]['files'] = array(
      '#parents' => array($fieldname),
      '#theme' => 'filefield_form_current',
      // remember the force_list setting so that the theme function knows
      '#force_list' => $field['force_list'],
    );
    foreach($items as $delta => $file) {
      // @todo: split into its own form and theme functions per file like imagefield
      if ($file['filepath'] && !$file['delete']) {
        $form[$fieldname]['files'][$delta] = _filefield_file_form($node, $field, $file);
      }
      else if ($file['filepath'] && $file['delete']) {
        $form[$fieldname]['files'][$delta]['delete'] = array(
          '#type' => 'hidden',
          '#value' => $file['delete'],
        );
      }
    }
    // Special handling for single value fields.
    if (!$field['multiple']) {
      $form[$fieldname]['replace'] = array(
        '#type' => 'markup',
        '#value' => '<p>'. t('If a new file is uploaded, this file will be replaced upon submitting this form.') .'</p>',
        '#prefix' => '<div class="description">',
        '#suffix' => '</div>',
      );
    }
  }

  // The class triggers the js upload behaviour.
  $form[$fieldname.'-attach-url'] = array(
    '#type' => 'hidden',
    '#value' => url('filefield/js', NULL, NULL, TRUE),
    '#attributes' => array('class' => 'upload'),
  );

  // Some useful info for our js callback.
  $form['vid'] = array(
    '#type' => 'hidden',
    '#value' => $node->vid,
    '#tree' => FALSE,
  );
  $form['nid'] = array(
    '#type' => 'hidden',
    '#value' => $node->nid,
    '#tree' => FALSE,
  );
  $form['type'] = array(
    '#type' => 'hidden',
    '#value' => $node->type,
    '#tree' => FALSE,
  );

  return $form;
}

function _filefield_file_form($node, $field, $file) {
  // Lets be a good boy and initialize our variables.
  $form = array();
  $form['#after_build'] = array('_filefield_file_form_description_reset');

  $form['icon'] = array(
    '#type' => 'markup',
    '#value' => theme('filefield_icon', $file),
  );

  $form['file_preview'] = array();

  $filepath = ($file['fid'] == 'upload')
              ? file_create_filename($file['filename'], file_create_path($field['widget']['file_path']))
              : $file['filepath'];

  $url = file_create_url($filepath);
  $url = "<small>". check_plain($url) ."</small>";

  $form['description'] = array(
      '#type' => 'textfield', 
      '#default_value' => (strlen($file['description'])) ? $file['description'] : $file['filename'], '#maxlength' => 256, 
  );
  $form['url'] = array(
    '#type' => 'markup',
    '#value' => t('URL: !url', array('!url' => $url)),
    '#prefix' => '<div class="filefield-edit-file-url">',
    '#suffix' => '</div>',
  );
  $form['size'] = array(
    '#type' => 'markup', 
    '#value' => format_size($file['filesize']),
    '#prefix' => '<div class="filefield-edit-file-size">',
    '#suffix' => '</div>',
  );
  $form['delete'] = array(
    '#type' => 'checkbox',
    '#default_value' => $file['delete'],
  );

  // Only show the list checkbox if files are not forced to be listed.
  if (!$field['force_list']) {
    $form['list'] = array(
      '#type' => 'checkbox',
      '#default_value' => $file['list'],
    );
  }
  else {
    $form['list'] = array(
      '#type' => 'value',
      '#value' => isset($file['list']) ? $file['list'] : 1,
    );
  }

  $form['filename'] = array('#type' => 'value',  '#value' => $file['filename']);
  $form['filepath'] = array('#type' => 'value',  '#value' => $file['filepath']);
  $form['filemime'] = array('#type' => 'value',  '#value' => $file['filemime']);
  $form['filesize'] = array('#type' => 'value',  '#value' => $file['filesize']);
  $form['fid'] = array('#type' => 'value',  '#value' => $file['fid']);

  // Remember the current filename for the check in
  // _filefield_file_form_description_reset() that happens after submission.
  $form['previous_filepath'] = array('#type' => 'hidden',  '#value' => $file['filepath']);

  foreach (module_implements('filefield') as $module) {
    $function = $module .'_filefield';
    $function('file_form', $node, $field, $file, $form);
  } 
  return $form;
}

/**
 * This after_build function is needed as fix for tricky Form API behaviour:
 * When using filefield without AJAX uploading, the description field was not
 * updated to a new '#default_value' because the textfield has been submitted,
 * which causes Form API to override the '#default_value'.
 *
 * That bug is fixed with this function by comparing the previous filename
 * to the new one, and resetting the description to the '#default_value'
 * if the filename has changed.
 */
function _filefield_file_form_description_reset($form, $form_values) {
  // Don't bother resetting the description of files that stay the same
  if ($form['fid']['#value'] != 'upload') {
    return $form;
  }
  // Get the previous filename for comparison with the current one.
  $previous = $form['previous_filepath']['#post'];
  foreach ($form['previous_filepath']['#parents'] as $parent) {
    $previous = isset($previous[$parent]) ? $previous[$parent] : NULL;
  }
  // If a new file was uploaded (the file path changed), reset the description.
  if ($previous != $form['filepath']['#value']) {
    $form['description']['#value'] = $form['description']['#default_value'];
  }
  return $form;
}


/**
 * Validate the form widget.
 */
function _filefield_widget_validate($node, $field, $items) {
  
  if (!$field['required']) {
    return;
  }
  
  // if there aren't any items.. throw an error.
  if (!count($items)) {
    form_set_error($field['field_name'], t('@field is required. Please upload a file.', array('@field' => $field['widget']['label'])));
  }
  else {
    // Sum all the items marked for deletion, so we can make sure the end user
    // isn't deleting all of the files.
    $count_deleted = 0;
    foreach($items as $item) {
      $count_deleted += isset($item['delete']) && $item['delete'];
    }
    if (count($items) == $count_deleted) {
      form_set_error($field['field_name'], t('@field is required. Please keep at least one file or upload a new one.', array('@field' => $field['widget']['label'])));
    }
  }
}


/**
 * Implementation of hook_field formatter.
 * @todo: finish transformer.module and integrate like imagecache with imagefield.
 */
function filefield_field_formatter_info() {
  $formatters = array(
     'default' => array(
        'label' => t('Default'),
        'field types' => array('file'),
      ),
  );
  return $formatters;
}

function filefield_field_formatter($field, $item, $formatter) {
  if($field['force_list']) {
    $item['list'] = 1; // always show the files if that option is enabled
  }
  if(!empty($item['fid'])) {
    $item  =  array_merge($item, _filefield_file_load($item['fid']));
  }
  if (!empty($item['filepath'])) {
    return theme('filefield', $item);
  }
}

function _filefield_file_load($fid = NULL) {
  // Don't bother if we weren't passed and fid.
  if (!empty($fid) && is_numeric($fid)) {
    $result = db_query('SELECT * FROM {files} WHERE fid = %d', $fid);
    $file = db_fetch_array($result);
    if ($file) {
      // let modules load extended attributes.
      $file += module_invoke_all('filefield', 'file_load', $node, $field, $file);
      return $file;
    }
  }
  // return an empty array if nothing was found.
  return array();
}

function theme_filefield_form_current($form) {
  $header = $form['#force_list']
            ? array('', t('Delete'), t('Description'), t('Size'))
            : array('', t('Delete'), t('List'), t('Description'), t('Size'));

  foreach (element_children($form) as $key) {
    // Don't display (hidden) replaced items.
    if ($form[$key]['delete']['#type'] == 'hidden') {
      continue;
    }

    $row = array();
    // we just going to lose this for now until we figure out how to handle it... 
    $row[] = drupal_render($form[$key]['file_preview']);  
    $row[] = drupal_render($form[$key]['delete']);
    if (!$form['#force_list']) {
      $row[] = drupal_render($form[$key]['list']);
    }
    $row[] = drupal_render($form[$key]['icon']).
             drupal_render($form[$key]['description']).
             drupal_render($form[$key]['url']);
    $row[] = drupal_render($form[$key]['size']);
    $rows[] = $row;
  }
  $output = theme('table', $header, $rows);
  $output .= drupal_render($form);
  return $output;
}

function theme_filefield_icon($file) {
  $ext = array_pop(explode('.',$file['filename']));
  $known_extensions = array('0','ace','aif','ai','ani','asf','asp','avi','bak','bat','bin','bmp','bz2','bz','cab','cdr','cfg','com','conf','cpt','css','cur','dat','db','dcr','dic','diff','dir','dll','dmg','doc','dwg','edir','eml','eps','exe','fla','flv','fon','gif','gz','hqx','html','htm','ico','inc','ini','iso','jpeg','jpg','js','lnk','log','m3u','mdb','midi','mid','mov','mp3','mpeg','mpg','nfo','odb','odc','odf','odg','odm','odp','ods','odt','ogg','otg','oth','otp','ots','ott','patch','pdf','php3','php','phtml','pl','png','pps','ppt','psd','pwl','qt','ram','ra','rar','reg','rpm','rtf','sh','shtml','sit','sql','svg','swf','sxc','sxi','sxw','sys','tar','tgz','tiff','tif','tmp','tpl','ttf','txt','wav','wma','wmv','wp','xls','xml','zip');
  if (!in_array($ext, $known_extensions))  {
    $ext = 0;
  }
  $icon = '';
  $iconpath = base_path() .'/'. drupal_get_path('module','filefield') .'/ico/'. $ext .'.png';
  if (file_exists($iconpath)) {
    $icon = '<img class="field-icon-'. $ext .'" src="'. $imagepath .'" />';
  }
  return '<div class="filefield-icon field-icon-'. $ext .'">'. $icon .'</div>';
}

function theme_filefield_view_file($file) {
  return theme('filefield', $file);
}

function theme_filefield($file) {
  if (user_access('view filefield uploads') && is_file($file['filepath']) && $file['list']) {
    $path = ($file['fid'] == 'upload')
            ? file_create_filename($file['filename'], file_create_path($field['widget']['file_path']))
            : $file['filepath'];

    $url = file_create_url($path);
    $desc = $file['description'];
    return l($desc, $url);
  }
  return '';
}

function filefield_file_download($file) {
  $file = file_create_path($file);

  $result = db_query("SELECT * FROM {files} WHERE filepath = '%s'", $file);
  if (!$file = db_fetch_object($result)) {
    // We don't really care about this file.
    return;
  }

  $node = node_load($file->nid);
  if (!node_access('view', $node)) {
    // You don't have permission to view the node
    // this file is attached to.
    return -1;
  }
 
  // @todo: check the node for this file to be referenced in a field 
  // to determine if it is managed by filefield. and do the access denied part here.
  if (!user_access('view filefield uploads')) {
    // sorry you do not have the proper permissions to view
    // filefield uploads.
    return -1;
  }

  // Well I guess you can see this file.
  $name = mime_header_encode($file->filename);
  $type = mime_header_encode($file->filemime);
  // Serve images and text inline for the browser to display rather than download.
  $disposition = ereg('^(text/|image/)', $file->filemime) ? 'inline' : 'attachment';
  return array(
    'Content-Type: '. $type .'; name='. $name,
    'Content-Length: '. $file->filesize,
    'Content-Disposition: '. $disposition .'; filename='. $name,
    'Cache-Control: private',
  );
}

/**
 * Create the file directory relative to the 'files' dir recursively for every
 * directory in the path.
 * 
 * @param $directory
 *   The directory path under files to check, such as 'photo/path/here'
 * @param $form_element
 *   A form element to throw an error on if the directory is not writable
 */ 
function filefield_check_directory($directory, $form_element = array()) {
  foreach(explode('/', $directory) as $dir) {
    $dirs[] = $dir;
    $path = file_create_path(implode($dirs,'/'));
    file_check_directory($path, FILE_CREATE_DIRECTORY, $form_element['#parents'][0]);
  }
  return TRUE;
}

/**
 * Menu callback for JavaScript-based uploads.
 */
function filefield_js() {
  // Parse fieldname from submit button.
  $matches = array();
  foreach(array_keys($_POST) as $key) {
    if (preg_match('/cck_filefield_(.*)_op/', $key, $matches)) {
      $fieldname = $matches[1];
      break;
    }
  }

  $node = (object)$_POST;
  $field = content_fields($fieldname, $node->type); // load field data

  // Load fids stored by content.module.
  $items = array();
  $values = content_field('load', $node, $field, $items, FALSE, FALSE);
  $items = $values[$fieldname];

  // Load additional field data.
  filefield_field('load', $node, $field, $items, FALSE, FALSE);

  // Handle uploads and validation.
  _filefield_widget_prepare_form_values($node, $field, $items);
  _filefield_widget_validate($node, $field, $items);

  // Get our new form baby, yeah tiger, get em!
  $form = _filefield_widget_form($node, $field, $items);

  foreach (module_implements('form_alter') as $module) {
    $function = $module .'_form_alter';
    $function('filefield_js', $form);
  }
  $form = form_builder('filefield_js', $form);

  $output = theme('status_messages') . drupal_render($form);

  // Send the updated file attachments form.
  print drupal_to_js(array('status' => TRUE, 'data' => $output));
  exit();
}


function filefield_token_list($type = 'all') {
  if ($type == 'field' || $type == 'all') {
    $tokens = array();
    $tokens['file']['fid']       = t("File ID");
    $tokens['file']['title']     = t("File title");
    $tokens['file']['filename']  = t("File name");
    $tokens['file']['filepath']  = t("File path");
    $tokens['file']['filemime']  = t("File MIME type");
    $tokens['file']['filesize']  = t("File size");
    $tokens['file']['view']      = t("Fully formatted HTML file tag");

    return $tokens;
   }
}
 
function filefield_token_values($type, $object = NULL) {
  if ($type == 'field') {
    $item = $object[0];
    $tokens['fid']      = $item['fid'];
    $tokens['title']    = $item['title'];
    $tokens['filename'] = $item['filename'];
    $tokens['filepath'] = $item['filepath'];
    $tokens['filemime'] = $item['filemime'];
    $tokens['filesize'] = $item['filesize'];
    $tokens['view']     = $item['view'];
    return $tokens;
  }
}


/**
 * Custom filter for imagefield NOT NULL
 */
function filefield_views_handler_filter_is_not_null($op, $filter, $filterinfo, &$query) {
  if ($op == 'handler') {
    $query->ensure_table($filterinfo['table']);
    if ($filter['value']) {
      $qs = '%s.%s > 0';
    }
    else {
      $qs = '%s.%s = 0 OR %s.%s IS NULL';
    }
    $query->add_where($qs, $filterinfo['table'], $filterinfo['field'], $filterinfo['table'], $filterinfo['field']);
  }
}