storage_api_spike.php

<?php

/*
 * This is not a full module, just a demo of how I started working with
 * the Storage API Drupal module.
 * 
 * I have working code that looks a lot like this, so it should work more
 * or less. Hopefully it will be a starting point for other people to work
 * with Storage API.
 */
function storage_api_spike_menu() {
  $items = array();
  $items['admin/config/media/storage-test'] = array(
    'type' => MENU_NORMAL_ITEM,
    'title' => 'Storage API Spike',
    'page callback' => 'storage_api_spike_page',
    'access callback' => TRUE,
  );
}

function storage_api_spike_page() {
  return drupal_get_form("storage_api_spike_form");
}

function storage_api_spike_form($form, &$form_state) {
  $selector = storage_selector('storage_api_spike');
  $form['selector'] = $selector->formItem();
  $form['actions'] = array(
    '#type' => 'actions'
  );
  $form['actions']['submit'] = array(
    '#type' => 'submit',
    '#value' => 'Submit',
  );
  return $form;
}

function storage_api_spike_form_submit($form, $form_state) {
  // update selector class
  $selector = storage_selector('storage_api_spike');
  $selector->submit($form_state['values']['selector']);

  // create a temporary file and save it
  $tempname = drupal_tempnam("temporary://", "abcde");
  if ($realtemp_name = file_unmanaged_save_data("This is a file on " . date("Y-m-d H:i:s"), $tempname, FILE_EXISTS_REPLACE)) {
    drupal_set_message(drupal_realpath($realtemp_name));
  } else {
    drupal_set_message("Couldn't write to file");
    return;
  }

  // we use the filename as the identifier, so keep track of it
  $storage_filename = 'storage_api_spike/' . drupal_basename($tempname);

  // add the file to storage api
  $selector->storageAdd(array(
    'source_uri' => $tempname,
    'filename' => $storage_filename,
  ));

  // find the file by filename
  $query = db_select('storage', 's');
  $query->fields('s', array('storage_id'));
  $query->addJoin('INNER', 'storage_file', 'sf', 'sf.file_id = s.file_id');
  $query->condition("sf.filename", $storage_filename);
  $query->condition("s.selector_id", "storage_api_spike");
  $r = $query->execute();
  if ($r->rowCount() != 1) {
    drupal_set_message("Uh-oh! Should have found one and only one file with the name " . $storage_filename . "!", 'error');
    return;
  }

  // load the storage
  $storage_row = $r->fetchAssoc();
  $storage = storage_load($storage_row['storage_id']);

  // serve the file
  storage_serve($storage);  

}