Elgg-Lorea-Hydra/mod/videolist/upgrades/2012022501.php

<?php
/**
 * Download the video thumbnail in the server and link it to video
 *
 * First determine if the upgrade is needed and then if needed, batch the update
 */

$items = elgg_get_entities(array(
	'type' => 'object',
	'subtype' => 'videolist',
	'limit' => 5,
	'order_by' => 'e.time_created asc',
));

// if not items, no upgrade required
if (!$items) {
	return;
}

/**
 * Downloads the thumbnail and saves into data folder
 *
 * @param ElggObject $item
 * @return bool
 */
function videolist_2012022501($item) {
	require_once(elgg_get_plugins_path() . 'upgrade-tools/lib/upgrade_tools.php');

	// get thumbnail image
	$thumbnail = file_get_contents($item->thumbnail);
	if (!$thumbnail) {
		return false;
	}
	
	$prefix = "videolist/" . $item->guid;
	$filehandler = new ElggFile();
	$filehandler->owner_guid = $item->owner_guid;
	$filehandler->setFilename($prefix . ".jpg");
	$filehandler->open("write");
	$filehandler->write($thumbnail);
	$filehandler->close();
	
	// update properties
	if ($item->url) {
		$item->video_url = $item->url;
		$item->deleteMetadata('url');
	}
	if ($item->desc) {
		$item->description = $item->desc;
		$item->deleteMetadata('desc');
		$item->save();
	}
	if ($item->embedurl) {
		$item->deleteMetadata('embedurl');
	}
	upgrade_change_subtype($item, 'videolist_item');

	// update river
	$options = array('object_guid' => $item->guid);
	$river_items = elgg_get_river($options);
	foreach($river_items as $river_item) {
		if ($river_item->action_type == 'create') {
			upgrade_update_river($river_item->id, 'river/object/videolist_item/create', $item->guid, 0);
		}
	}

	return true;
}
$previous_access = elgg_set_ignore_access(true);
$options = array(
	'type' => 'object',
	'subtype' => 'videolist',
	'limit' => 0,
);
$batch = new ElggBatch('elgg_get_entities', $options, 'videolist_2012022501', 100);
elgg_set_ignore_access($previous_access);

if ($batch->callbackResult) {
	error_log("Elgg videolist upgrade (2012022501) succeeded");
} else {
	error_log("Elgg videolist upgrade (2012022501) failed");
}