Writing out derivatives for use in another Islandora

islandora_derivative_factory

This simple module:

<?php

/**
* Implements hook_islandora_object_ingested().
 */
function islandora_derivative_factory_islandora_object_ingested(AbstractObject $object) {
  $base_output_dir = '/tmp/derivativefactoryoutput';
  foreach ($object as $ds) {
    if ($ds->id != 'RELS-EXT') {
      $mime_detect = new MimeDetect();
      $extension = $mime_detect->getExtension($ds->mimetype);
      $filename = $ds->id . '.' . $extension;

      $object_dir_name = preg_replace('/:/', '_', $object->id);
      $output_dir = $base_output_dir . '/' . $object_dir_name;
      if (!file_exists($output_dir)) {
        mkdir($output_dir, 0700);
      }
      $ds_output_path = $output_dir . '/' . $object_dir . '/' . $filename;

      $ds->getContent($ds_output_path);
    }
  }
}

/**
 * Implements hook_islandora_datastream_ingested().
 */
function islandora_derivative_factory_islandora_datastream_ingested(AbstractObject $object, AbstractDatastream $datastream) {
  if ($datastream->id == 'RELS-EXT') {
    return;
  }
  $base_output_dir = '/tmp/derivativefactoryoutput';
  $mime_detect = new MimeDetect();
  $extension = $mime_detect->getExtension($datastream->mimetype);
  $filename = $datastream->id . '.' . $extension;

  $object_dir_name = preg_replace('/:/', '_', $object->id);
  $output_dir = $base_output_dir . '/' . $object_dir_name;
  if (!file_exists($output_dir)) {
    mkdir($output_dir, 0700);
  }
  $ds_output_path = $output_dir . '/' . $object_dir . '/' . $filename;

  $datastream->getContent($ds_output_path);
}

// End of module

will write out the following files if you batch ingest three simple image objects:

/tmp/derivativefactoryoutput
├── testing_55
│   ├── DC.xml
│   ├── MEDIUM_SIZE.jpg
│   ├── MODS.xml
│   ├── OBJ.jpg
│   ├── TECHMD.xml
│   └── TN.jpg
├── testing_56
│   ├── DC.xml
│   ├── MEDIUM_SIZE.jpg
│   ├── MODS.xml
│   ├── OBJ.jpg
│   ├── TECHMD.xml
│   └── TN.jpg
└── testing_57
    ├── DC.xml
    ├── MEDIUM_SIZE.jpg
    ├── MODS.xml
    ├── OBJ.jpg
    ├── TECHMD.xml
    └── TN.jpg