s3_fb.module in Filebrowser 7.4

File

modules/s3_fb.module

<?php

function validate_s3($path) {
  $client = awssdk_get_client('s3');
  $client
    ->registerStreamWrapper();
  if (!file_exists($path)) {

    //folder (object) does not exist so we wil create it
    $success = mkdir($path, 0777, TRUE);
    if (!$success) {
      form_set_error('file_path', t('The S3 directory %dir is not a valid directory and I\'m unable to help this.', array(
        '%dir' => $path,
      )));
    }
    else {
      drupal_set_message(t('The directory %dir has been created on S3.', array(
        '%dir' => $path,
      )));
    }
  }
  else {

    //Todo: check readability of S3 dir

    // php function is_readable() is avail in Amazon streamWrapper

    /*if (!is_readable($encoded_path)) {
        form_set_error('file_path', t('The directory %dir is not readable.', array(
        '%dir' => $path
        )));
      }*/
  }
}

/**
 * implements hook_form_alter
 * Enter S3 information on dir-listing node-edit form
 * @param $form
 * @param $form_state
 * @param $form_id
 */
function s3_fb_form_dir_listing_node_form_alter(&$form, &$form_state, $form_id) {
  $form['folder_path']['#description'] .= '<br>' . t('S3 Filebrowser module installed. To use Amazon S3 storage enter the full path to your storage location. Use lowercase s. (s3://your_bucket/directory)');
  $form['folder_rights']['download_archive']['#description'] .= '<br>' . t('S3 Filebrowser module installed.') . '<br><strong>' . t('Folder download is not supported yet by S3 Filebrowser. Please deselect this option.');
}

/**
 * @function Creates a .. file since this is not available in a s3 system.
 * @param $nid integer Node id for which this FileBrowser is created
 * @param $fs_root string The root for this directory
 * @return array
 */
function s3_create_subdir($nid, $fs_root) {
  return array(
    'nid' => $nid,
    'display-name' => '..',
    'relative-path' => '/',
    'full-path' => $fs_root,
    'status' => MARK_READ,
    'kind' => 2,
    'mime-type' => 'folder/parent',
    'url' => url('node/' . $nid, array(
      'absolute' => TRUE,
    )),
  );
}

/**
 * @function Creates a . file (parent folder) since this is not available in a s3 system.
 * @param $nid
 * @param $fs_root
 * @return array
 */
function s3_create_updir(&$file_array, $nid, $fs_root) {
  $file_array['nid'] = $nid;
  $file_array['display-name'] = '.';
  $file_array['full-path'] = $fs_root;
  $file_array['status'] = MARK_READ;
  $file_array['kind'] = 1;
  $file_array['mime-type'] = 'folder';
}
function s3_set_db_content_updir($nid) {
  $content = (array) db_query("SELECT * FROM {node_dir_listing_content} WHERE nid = :nid and path = :path", array(
    ':nid' => $nid,
    ':path' => '/',
  ))
    ->fetch();
  if ($content) {
    $content_arr =& $content;
  }
  else {

    // set an error. This is an sub directory, so the 'up directory' should already exist in the DB
    drupal_set_message(t('Parent directory reference error.'), 'error');
  }
  $content_arr['exists'] = true;
  $content_arr['display-name'] = '..';
  return $content_arr;
}
function s3_delete($target) {
  $client = awssdk_get_client('s3');
  $client
    ->registerStreamWrapper();
  $type = filetype($target);
  switch ($type) {
    case "file":
      $result = unlink($target);
      if (!$result) {
        drupal_set_message(t('Unable to delete @file', array(
          '@file' => $target,
        )), 'warning');
      }
      break;
    case "dir":

      // todo: s3 will not delete an non-empty folder. But wil fail silently.
      // todo: check why we need an end slash
      $result = $client
        ->deleteObject(s3_object_info($target . '/'));
      if (!$result) {
        drupal_set_message(t('Unable to delete @file', array(
          '@file' => $target,
        )), 'warning');
      }
      break;
    default:
      drupal_set_message(t('Switch case default error in function s3_delete().'), 'error');
  }
}

/**
 *  Takes a path to an S3 object and breakes it down to it's bucket and key
 * @param string $path Path to breakdown
 * @return array array with value of bucket and key of object
 */
function s3_object_info($path) {
  $bucket_key = str_replace('s3://', '', $path);
  $arr = explode('/', $bucket_key);
  $bucket = $arr[0];
  unset($arr[0]);
  $key = implode('/', $arr);
  return array(
    'Bucket' => $bucket,
    'Key' => $key,
  );
}

/**
 * We cannot use regular PHP file functions to create the archive files so we use AWS SDK
 * @param $target
 * @param $node
 * @param $fid
 * @param $files_fid
 * @return null|string
 */
function s3_create_archive($target, $node, $fid, $files_fid) {

  //debug($target, 'target');
  $client = awssdk_get_client('s3');
  $client
    ->registerStreamWrapper();
  $zip = new ZipArchive();
  $target = file_directory_temp() . "/filebrowser_" . _filebrowser_safe_basename($target) . ".zip";

  //debug($target, 'target');
  $cleanup = $target;
  if (!file_exists(_filebrowser_safe_dirname($target))) {
    mkdir(_filebrowser_safe_dirname($target), 0777, TRUE);
  }
  if (file_exists($target)) {
    unlink($target);
  }
  _filebrowser_load_files($node, $fid);
  if ($zip
    ->open($target, ZIPARCHIVE::CREATE) === TRUE) {

    //debug($target, 'The zip file');
    foreach ($node->file_listing as $file_name => $file_data) {
      if ($file_data['kind'] === 0 && (!$files_fid || in_array($file_data['fid'], $files_fid))) {
        $fs_filename = _filebrowser_encoding_to_fs($node, _filebrowser_get_node_root($node) . $file_data['relative-path']);
        try {
          $result = $client
            ->getObject(s3_object_info($fs_filename));
          $body = $result
            ->get('Body');
          $body
            ->rewind();
          $content = $body
            ->read($result['ContentLength']);
        } catch (Aws\S3\Exception\S3Exception $e) {

          // todo: wrap in drupal message
          echo "Request failed.<br />";
        }
        $zip
          ->addFromString($file_name, $content);
      }
    }
    $zip
      ->close();
  }
  else {
    return t("Unable to create temporary zip file '@file'", array(
      '@file' => $target,
    ));
  }
  return $target;
}

Functions

Name	Description
s3_create_archive	We cannot use regular PHP file functions to create the archive files so we use AWS SDK
s3_create_subdir	@function Creates a .. file since this is not available in a s3 system.
s3_create_updir	@function Creates a . file (parent folder) since this is not available in a s3 system.
s3_delete
s3_fb_form_dir_listing_node_form_alter	implements hook_form_alter Enter S3 information on dir-listing node-edit form
s3_object_info	Takes a path to an S3 object and breakes it down to it's bucket and key
s3_set_db_content_updir
validate_s3