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Re: [VuFind-Tech] bookcover.php possible enhancements
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From: Andrew N. <and...@vi...> - 2008-03-31 15:36:56
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Bob - can you just send a patch - it's a bit easier to manage. Just do the following:
%> svn diff bookcover.php
This way we can see the changes from the most recent copy of the file. Then just send the output to the list.
Thanks
Andrew
> -----Original Message-----
> From: vuf...@li... [mailto:vufind-tech-
> bo...@li...] On Behalf Of Bob Wicksall
> Sent: Monday, March 31, 2008 11:25 AM
> To: vuf...@li...
> Subject: [VuFind-Tech] bookcover.php possible enhancements
>
> I ran into a problem with book covers on my vuFind install on CentOS.
> Basically the fopen wrapper for URL's seems to be broken in the latest
> CentOS release. I thought others might run into the same problem
> because many admins disable fopen wrappers for URLs because of security
> concerns. The preferred way is to use curl.
>
> I rewrote the Amazon book cover code to use curl and while I was at it
> I implemented a poor mans caching scheme. An added benefit to using
> curl is the fact that we can control the timeout in the script so when
> things are bad we don't have to wait for an eternity for image
> retrieval to timeout. To make it work all you need is a cover_images
> folder in web with write access for apache.
>
> There are still a couple things to be done. I need to write some sort
> or cache management script to clean up and keep the cache current and I
> haven't touched the other two image sources yet.
>
> I'm not sure of the best way to post the source so I'll try including
> it in this message.
>
> <?php
> /**
> *
> * Copyright (C) Villanova University 2007.
> *
> * This program is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License version 2,
> * as published by the Free Software Foundation.
> *
> * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
> USA
> *
> */
>
> /*
> * @todo Convert this to an AJAX approach to allow for client side
> access to
> * images. Also investigate local caching approach. What
> about using
> * Squid?
> */
>
> // Retrieve values from configuration file
> $configArray = parse_ini_file('conf/config.ini', true);
>
> if (isset($configArray['BookCovers'])) {
> switch($configArray['BookCovers']['provider']) {
> case 'Google':
> if (is_readable('cover_images/' . $_GET['isn'] . '.jpg')) {
> // Load local cache if available
> header('Content-type: image/jpeg');
> echo readfile('cover_images/' . $_GET['isn'] . '.jpg');
> } else {
> // Fetch from provider
> google();
> }
> break;
> case 'Syndetics':
> if (is_readable('cover_images/' . $_GET['isn'] . '.jpg')) {
> // Load local cache if available
> header('Content-type: image/jpeg');
> echo readfile('cover_images/' . $_GET['isn'] . '.jpg');
> } else {
> // Fetch from provider
> syndetics();
> }
> break;
> case 'Amazon':
> default:
> if (is_readable('cover_images/amazon-'. $_GET['size'] .'-'.
> $_GET['isn'] .'.jpg')) {
> // Load local cache if available
> header('Content-type: image/jpeg');
> echo readfile('cover_images/amazon-'. $_GET['size'] .'-
> '. $_GET['isn'] .'.jpg');
> } else {
> // Fetch from provider
> amazon();
> }
> break;
> }
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
>
> function syndetics()
> {
> global $configArray;
>
> switch ($_GET['size']) {
> case 'small':
> header('Content-type: image/gif');
> $size = 'SC.GIF';
> break;
> case 'medium':
> header('Content-type: image/gif');
> $size = 'MC.GIF';
> break;
> case 'large':
> header('Content-type: image/jpeg');
> $size = 'LC.JPG';
> break;
> }
>
> $url = 'http://www.syndetics.com/index.aspx?type=xw12&isbn=' .
> $_GET['isn'] .
> '/' . $size . '&client=' . $configArray['BookCovers']['id'];
> if (!($binary = readfile($url))) {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> } else {
> echo $binary;
> }
> }
>
> function google()
> {
> require_once 'HTTP/Request.php';
>
> global $configArray;
>
> $url = 'http://books.google.com/books?jscmd=viewapi&' .
> 'bibkeys=ISBN:' . $_GET['isn'] . '&callback=addTheCover';
> $client = new HTTP_Request();
> $client->setMethod(HTTP_REQUEST_METHOD_GET);
> $client->setURL($url);
> $result = $client->sendRequest();
> if (!PEAR::isError($result)) {
> $json = $client->getResponseBody();
> $json = substr($json, strlen('addthecover('));
> $json = substr($json, 0, -strlen(');'));
> if ($json = json_decode($json, true)) {
> if ($fp = fopen($json['ISBN:' .
> $_GET['isn']]['thumbnail_url'], 'r')) {
> header('Content-type: image/jpeg');
> $image = $json['ISBN:' .
> $_GET['isn']]['thumbnail_url'];
> echo readfile($image);
> fclose($fp);
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
> }
>
> function amazon()
> {
> require_once 'HTTP/Request.php';
> require_once 'XML/Unserializer.php';
>
> global $configArray;
>
> $url = 'http://webservices.amazon.com/onca/xml?' .
> 'Service=AWSECommerceService&' .
> 'SubscriptionId=' . $configArray['BookCovers']['id'] . '&' .
> 'Operation=ItemLookup&' .
> 'ResponseGroup=Images&' .
> 'ItemId=' . $_GET['isn'];
> $client = new HTTP_Request();
> $client->setMethod(HTTP_REQUEST_METHOD_GET);
> $client->setURL($url);
> $result = $client->sendRequest();
> if (!PEAR::isError($result)) {
> $unxml = new XML_Unserializer();
> $unxml->unserialize($client->getResponseBody());
> $data = $unxml->getUnserializedData();
> if (isset($data['Items']['Item'])) {
> switch ($_GET['size']) {
> case 'small':
> $image =
> $data['Items']['Item']['SmallImage']['URL'];
> break;
> case 'medium':
> $image =
> $data['Items']['Item']['MediumImage']['URL'];
> break;
> case 'large':
> $image =
> $data['Items']['Item']['LargeImage']['URL'];
> break;
> }
> if ($image) {
> $ch = curl_init();
> $timeout = 5;
> curl_setopt ($ch, CURLOPT_URL, $image);
> curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
> curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
> curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
>
> $image_data = curl_exec($ch);
> $curl_error = curl_error($ch);
> curl_close($ch);
>
> if ($curl_error == '')
> {
> if ($cache_image = fopen('cover_images/amazon-'.
> $_GET['size'] .'-'. $_GET['isn'] .'.jpg', 'wb'))
> {
> fwrite($cache_image,$image_data);
> fclose($cache_image);
> }
>
> header('Content-type: image/jpeg');
> echo $image_data;
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
> } else {
> header('Content-type: image/gif');
> echo readfile('images/noCover2.gif');
> }
> }
> ?>
>
> Bob Wicksall
> Systems Administrator
>
> Pioneer Library System
> 2557 State Rt. 21
> Canandaigua, New York 14424
>
> Voice: (585) 394-8260
> Fax: (585) 394-1935
>
>
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