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Path: /data/applications/aps/gallery/2.3-2/standard/htdocs/modules/linkitem/classes/ [ Home ]
File: LinkItemToolkit.class
<?php
/*
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2008 Bharat Mediratta
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */

GalleryCoreApi::requireOnce('modules/core/classes/GalleryToolkit.class');

/**
 * A GalleryToolkit to provide a thumbnail image for an external URL
 * @package LinkItem
 * @subpackage Classes
 * @author Alan Harder <alan.harder@sun.com>
 * @version $Revision: 17580 $
 */
class LinkItemToolkit extends GalleryToolkit {
    /**
     * @see GalleryToolkit::performOperation
     */
    function performOperation($mimeType, $operationName, $sourceFilename,
			      $destFilename, $parameters, $context=array()) {
	global $gallery;
	$platform =& $gallery->getPlatform();

	if ($operationName != 'convert-to-image/jpeg' || $mimeType != 'gallery/linkitem') {
	    return array(GalleryCoreApi::error(ERROR_UNSUPPORTED_OPERATION, __FILE__, __LINE__,
					       "$operationName $mimeType"), null, null);
	}
	list ($ret, $urlSnapshot) =
	    GalleryCoreApi::getPluginParameter('module', 'linkitem', 'urlSnapshot');
	if ($ret) {
	    return array($ret, null, null);
	}

	if (!$urlSnapshot) {
	    if (!$platform->copy(dirname(dirname(__FILE__)) . '/images/link.jpg',
				 $destFilename)) {
		return array(GalleryCoreApi::error(ERROR_PLATFORM_FAILURE), null, null);
	    }
	    $context['width'] = 270;
	    $context['height'] = 224;
	    return array(null, 'image/jpeg', $context);
	}

	/* Source URL is passed in as "source filename" */
	$url = $sourceFilename;

	/* Fetch snapshot image from webdesignbook.net
	list ($success, $response, $headers) = GalleryCoreApi::fetchWebFile(
		'http://webdesignbook.net/snapper.php?url=' . urlencode($url) . '&w=1024&h=768',
		$destFilename);
	if (!$success) {
	    return array(GalleryCoreApi::error(ERROR_TOOLKIT_FAILURE), null, null);
	}
	*/
	list ($ret, $snapshotExec) =
	    GalleryCoreApi::getPluginParameter('module', 'linkitem', 'snapshotExec');
	if ($ret) {
	    return array($ret, null, null);
	}
	if (empty($snapshotExec)) {
	    return array(GalleryCoreApi::error(ERROR_CONFIGURATION_REQUIRED), null, null);
	}
	$tmpBase = $platform->tempnam($gallery->getConfig('data.gallery.tmp'), 'lnk_');
	$tmpFile = $tmpBase . '.jpg';
	$map = array('%WIDTH%' => 1024, '%HEIGHT%' => 768,
		     '%URL%' => $url, '%OUTFILE%' => $tmpFile);
	$exec = explode(' ', LinkItemToolkit::getSnapshotParams());
	foreach ($exec as $i => $param) {
	    if (isset($map[$param])) {
		$exec[$i] = $map[$param];
	    }
	}
	array_unshift($exec, $snapshotExec);
	list ($success, $output, $error) = $platform->exec(array($exec));
	@$platform->unlink($tmpBase);
	if (!$success) {
	    return array(GalleryCoreApi::error(ERROR_TOOLKIT_FAILURE), null, null);
	}
	$success = $platform->copy($tmpFile, $destFilename);
	@$platform->unlink($tmpFile);
	if (!$success) {
	    return array(GalleryCoreApi::error(ERROR_PLATFORM_FAILURE), null, null);
	}

	$context['width'] = $map['%WIDTH%'];
	$context['height'] = $map['%HEIGHT%'];
	return array(null, 'image/jpeg', $context);
    }

    /**
     * Get command line parameters for snapshotExec.
     * Default params for khtml2png are hardcoded; can be overridden by params.txt file.
     * @return string command line parameters with %URL% %WIDTH% %HEIGHT% %OUTFILE% tokens
     * @static
     */
    function getSnapshotParams() {
	global $gallery;
	$platform =& $gallery->getPlatform();
	$paramFile = dirname(dirname(__FILE__)) . $platform->getDirectorySeparator() . 'params.txt';
	if ($platform->file_exists($paramFile)) {
	    $lines = $platform->file($paramFile);
	    if (!empty($lines)) {
		return rtrim(array_shift($lines));
	    }
	}
	return '--width %WIDTH% --height %HEIGHT% %URL% %OUTFILE%';
    }
}
?>