islandora/includes/datastream.inc

<?php

/**
 * @file datastream.inc 
 */

define('DS_COMP_STREAM', 'DS-COMPOSITE-MODEL');
/**
 *
 * @global object $user
 * @param string $object_id
 * @param string $dsid
 * @return stream 
 *  prints datastream to browser
 */
function islandora_datastream_as_attachment($object_id, $dsid) {
  module_load_include('inc', 'islandora', 'RestConnection');
  global $user;
  try {
    $restConnection = new RestConnection($user);
    $fedora_object = new FedoraObject($object_id, $restConnection->repository);
  } catch (Exception $e) {
    drupal_set_message(t('Error getting Islanndora datastream $d for object %s', array('%s' => $object_id, '%d' => $dsid)), 'error');
    return"";
  }
  header('Content-type: ' . $fedora_object[$dsid]->mimetype);
  header('Content-length: ' . $fedora_object[$dsid]->size);
  header("Cache-control: private");
  $method = arg(5);
  if (isset($method) && $method == 'download') {
    header("Content-Disposition: attachment; filename=\"" . $fedora_object[$dsid]->label);
  }
  print($fedora_object[$dsid]->content);
  exit();
}

/**
 *
 * @param array $arr
 *   an array of dsids that are defined by this objects cmodels
 * @param string $ds_comp_stream 
 *   the dscomposite stream as xml
 */
function islandora_get_defined_dsids_array(&$arr, $ds_comp_stream) {
  $sxml = new SimpleXMLElement($ds_comp_stream);
  foreach ($sxml->dsTypeModel as $ds) {
    //$arr[$ds['ID']] 
    $mimes = array();
    foreach ($ds->form as $form) {
      $mimetype = (string) $form['MIME'];
      $mimes[] = $mimetype;
    }
    $dsid = (string) $ds['ID'];
    if ($dsid != 'AUDIT') {
      $arr[(string) $ds['ID']] = $mimes;
    }
  }
}

/**
 *
 * @global type $user
 * @param string $object_id
 * @return string|array 
 */
function islandora_get_unused_dsids($object_id) {
  module_load_include('inc', 'islandora', 'RestConnection');
  global $user;
  try {
    $restConnection = new RestConnection($user);
    $fedora_object = new FedoraObject($object_id, $restConnection->repository);
  } catch (Exception $e) {
    drupal_set_message(t('Error getting Islandora object %s ', array('%s' => $object_id)), 'error');
    return;
  }
  if (!isset($fedora_object)) {
    drupal_set_message(t('Could not create add datastream form for %s'), array('%s' => $object_id));
    return;
  }
  $models = $fedora_object->models;
  $defined_dsids = array();
  if (isset($models)) {
    foreach ($models as $model) {
      try {
        $model_object = new FedoraObject($model, $restConnection->repository);
        if (isset($model_object[DS_COMP_STREAM])) {
          $dscomposite_stream = $model_object[DS_COMP_STREAM]->content;
          islandora_get_defined_dsids_array($defined_dsids, $dscomposite_stream);
        }
      } catch (Exception $e) {
        //do nothing as other objects may have a dscompsite stream
      }
    }
  }
  foreach ($defined_dsids as $key => $value) {
    if (isset($fedora_object[$key])) {
      unset($defined_dsids[$key]); //ds exists in the object so don't show in the dropdown
    }
  }
  return $defined_dsids;
}

/**
 * buids the default add datastream form
 * @param string $object_id
 * @param array $form_state
 * @return array 
 *  a form ready to be rendered with a call to Drupal render
 */
function islandora_get_add_datastream_form($object_id, &$form_state) {
  $unused_dsids = islandora_get_unused_dsids($object_id); //$defined_dsids;
  $form = array();
  $form['add_fieldset'] = array(
    '#type' => 'fieldset',
    '#title' => 'Add a datastream',
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
  );
  $form['add_fieldset']['add_datastream_label'] = array(
    '#value' => t('<br /><h3>Add Datastream:</h3>'),
    '#weight' => -10,
  );

  $form['pid'] = array(
    '#type' => 'hidden',
    '#value' => "$object_id"
  );

  $form['add_fieldset']['stream_label'] = array(
    '#title' => 'Datastream Label',
    '#required' => 'TRUE',
    '#description' => t('A Human readable label'),
    '#type' => 'textfield'
  );

  $form['#attributes']['enctype'] = 'multipart/form-data';
  $form['add_fieldset']['add-stream-file-location'] = array(
    '#type' => 'file',
    '#title' => t('Upload Document'),
    '#size' => 48,
    // '#required'=>'TRUE',
    '#description' => t('The file to upload.')
  );
  $form['#redirect'] = "islandora/object/$object_id/";
  $form['add_fieldset']['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Add Datastream')
  );

  if (!empty($unused_dsids)) {
    $dsidsForForm = array();
    foreach ($unused_dsids as $key => $value) {
      $dsidsForForm[$key] = $key;
    }
    $form['add_fieldset']['stream_id'] = array(
      '#type' => 'select',
      '#title' => t('Datastream ID'),
      '#default_value' => variable_get('feed_item_length', 'teaser'),
      '#weight' => '-1',
      '#description' => t('Datastream IDs defined by the content model.'),
    );
    $form['add_fieldset']['stream_id']['#options'] = $dsidsForForm;
  }
  else {
    $form['add_fieldset']['stream_id'] = array(
      '#title' => 'Datastream ID',
      '#required' => 'TRUE',
      '#description' => t('An ID for this stream that is unique to this object. Must start with a letter and contain only alphanumeric characters and dashes and underscores.'),
      '#type' => 'textfield',
      '#weight' => -1,
    );
  }
  return $form;
}