require_once dirname(__FILE__) . '/sha256.inc.php';

if (!function_exists('hmac'))

{

function hmac($key, $data, $hashfunc='sha256')

{

$blocksize=64;

if (strlen($key) > $blocksize) $key=pack('H*', $hashfunc($key));

$key=str_pad($key, $blocksize, chr(0x00));

$ipad=str_repeat(chr(0x36), $blocksize);

$opad=str_repeat(chr(0x5c), $blocksize);

$hmac = pack('H*', $hashfunc(($key^$opad) . pack('H*', $hashfunc(($key^$ipad) . $data))));

return $hmac;

}

}

global $item, $items;

$options = get_option('nowReadingOptions');

$using_isbn = false;

parse_str($query);

if ( empty($isbn) && empty($title) && empty($author) )

return false;

if ( !empty($isbn) )

$using_isbn = true;

// Our query needs different vars depending on whether or not we're searching by ISBN, so build it here.

if ( $using_isbn ) {

$isbn = preg_replace('#([^0-9x]+)#i', '', $isbn);

$query = "isbn:$isbn";

} else {

$query='';

if ( !empty($title) )

$query = 'title:' . urlencode($title);

if ( !empty($author) )

$query .= 'author:' . urlencode($author);

}

// these items MUST be set in the Options screen

$AWSAccessKeyId = trim($options['AWSAccessKeyId']);

$SecretAccessKey = trim($options['SecretAccessKey']);

# // some paramters

$method = "GET";

$host = "ecs.amazonaws".$options['domain'];

$uri = "/onca/xml";

// additional parameters

$params["Service"] = "AWSECommerceService";

// GMT timestamp

$params["Timestamp"] = gmdate("Y-m-d\TH:i:s\Z");

// API version

$params["Version"] = "2009-03-31";

$params["AssociateTag"] = urlencode($options['associate']);

$params["Power"] = $query;

$params["Operation"] = "ItemSearch";

$params["SearchIndex"] = "Books";

$params["ResponseGroup"] = "Request,Large,Images,AlternateVersions";

$params["AWSAccessKeyId"] = $AWSAccessKeyId;

// Sort paramters

ksort($params);

// re-build the request

$request = array();

foreach ($params as $parameter=>$value)

{

$parameter = str_replace("_", ".", $parameter);

$parameter = str_replace("%7E", "~", rawurlencode($parameter));

$value = str_replace("%7E", "~", rawurlencode($value));

$request[] = $parameter . "=" . $value;

}

$request = implode("&", $request);

$signatureString = $method . chr(10) . $host . chr(10) . $uri . chr(10) . $request;

$signature = urlencode(base64_encode(hmac($SecretAccessKey, $signatureString)));

$request = "http://" . $host . $uri . "?" . $request . "&Signature=" . $signature;

// Fetch the XML using either Snoopy or cURL, depending on our options.

if ( $options['httpLib'] == 'curl' ) {

if ( !function_exists('curl_init') ) {

return new WP_Error('curl-not-installed', __('cURL is not installed correctly.', NRTD));

} else {

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $request);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_USERAGENT, 'Now Reading ' . NOW_READING_VERSION);

curl_setopt($ch, CURLOPT_HEADER, 0);

if ( !empty($options['proxyHost']) ) {

$proxy = $options['proxyHost'];

if ( !empty($options['proxyPort']) ) {

$proxy .= ":{$options['proxyPort']}";

}

curl_setopt($ch, CURLOPT_PROXY, $proxy);

}

$xmlString = curl_exec($ch);

curl_close($ch);

}

} else {

require_once ABSPATH . WPINC . '/class-snoopy.php';

$snoopy = new snoopy;

$snoopy->agent = 'Now Reading Redux' . NOW_READING_VERSION;

if ( !empty($options['proxyHost']) )

$snoopy->proxy_host = $options['proxyHost'];

if ( !empty($options['proxyHost']) && !empty($options['proxyPort']) )

$snoopy->proxy_port = $options['proxyPort'];

$snoopy->fetch($request);

$xmlString = $snoopy->results;

}

if ( empty($xmlString) ) {

do_action('nr_search_error', $query);

echo '

<div id="message" class="error fade">

<p><strong>' . __("Oops!") . '</strong></p>

<p>' . sprintf(__("For some reason, I couldn't search for your book on amazon%s.", NRTD), $options['domain']) . '</p>

<p>' . __("Amazon's Web Services may be down, or there may be a problem with your server configuration.") . '</p>

';

if ( $options['httpLib'] )

echo '<p>' . __("Try changing your HTTP Library setting to <strong>cURL</strong>.", NRTD) . '</p>';

echo '

</div>

';

return false;

}

require_once 'xml/IsterXmlSimpleXMLImpl.php';

$impl = new IsterXmlSimpleXMLImpl;

$xml = $impl->load_string($xmlString);

if ( $options['debugMode'] )

robm_dump("Amazon Search XML:", htmlentities(str_replace(">", ">\n", $xmlString)));

$items = $xml->ItemSearchResponse->Items->children();

if (count($items) == 0)

{

return false;

}

$results = array();

foreach ($items as $item)

{

$attr = $item->ItemAttributes;

if (!$attr)

{

continue;

}

$asin = $item->ASIN->CDATA();

if (empty($asin))

{

continue;

}

// Get full meta-data given the current ISBN. Used to get all editions.

$metaData = getMetadataFromIsbn($asin, $AWSAccessKeyId, $SecretAccessKey, urlencode($options['associate']));

if ($options['debugMode'])

{

robm_dump("Amazon Lookup XML:", htmlentities(str_replace(">", ">\n", $metaData)));

}

$metaDataParser = new IsterXmlSimpleXMLImpl;

$metaDataXml = $metaDataParser->load_string($metaData);

if (isset($metadata->ItemLookupResponse->Items->Request->Errors))

{

continue;//$metadata->ItemLookupResponse->Items->Request->Errors;

}

$editions = $metaDataXml->ItemLookupResponse->Items->children();

if (count($editions) == 0)

{

continue;

}

// For each edition, add an entry.

foreach ($editions as $edition)

{

if (!isset($edition->ASIN))

{

continue;

}

$asin = $edition->ASIN->CDATA();

if (empty($asin))

{

continue;

}

$title = $edition->ItemAttributes->Title->CDATA();

if (empty($title))

{

continue;

}

$author = '';

if (is_array($edition->ItemAttributes->Author))

{

foreach ($edition->ItemAttributes->Author as $a)

{

if (is_object($a))

{

$author .= $a->CDATA() . ', ';

}

}

$author = substr($author, 0, -2);

}

else

{

if (is_object($edition->ItemAttributes->Author))

{

$author = $edition->ItemAttributes->Author->CDATA();

}

}

if (empty($author))

{

$author = apply_filters('default_book_author', 'Unknown');

}

$size = "{$options['imageSize']}Image";

if (empty($item->$size))

{

continue;

}

$image = $item->$size->URL->CDATA();

if (empty($image))

{

$image = get_option('siteurl') . '/wp-content/plugins/now-reading-redux/no-image.png';

}

$binding = '';

if (isset($edition->ItemAttributes->Binding))

{

$binding = $edition->ItemAttributes->Binding->CDATA();

}

$ed = '';

if (isset($edition->ItemAttributes->Edition))

{

$ed = $edition->ItemAttributes->Edition->CDATA();

}

$date = '';

if (isset($edition->ItemAttributes->PublicationDate))

{

$date = $edition->ItemAttributes->PublicationDate->CDATA();

}

$publisher = '';

if (isset($edition->ItemAttributes->Publisher))

{

$publisher = $edition->ItemAttributes->Publisher->CDATA();

}

if ($options['debugMode'])

{

robm_dump("book:", $author, $title, $binding, $ed, $date, $publisher, $asin);

}

$results[] = apply_filters('raw_amazon_results', compact('author', 'title', 'binding', 'ed', 'date', 'publisher', 'image', 'asin'));

}

}

$results = apply_filters('returned_books', $results);

return $results;

$host = 'ecs.amazonaws.com';

$path = '/onca/xml';

$args = array(

'AssociateTag' => $awsAssociateTag,

'AWSAccessKeyId' => $awsAccessKeyID,

'IdType' => 'ISBN',

'ItemId' => $isbn,

'Operation' => 'ItemLookup',

'ResponseGroup' => 'Large',

'SearchIndex' => 'Books',

'Service' => 'AWSECommerceService',

'Timestamp' => gmdate('Y-m-d\TH:i:s\Z'),

'Version'=> '2009-01-06'

);

ksort($args);

$parts = array();

foreach(array_keys($args) as $key) {

$parts[] = $key . "=" . $args[$key];

}

// Construct the string to sign

$stringToSign = "GET\n" . $host . "\n" . $path . "\n" . implode("&", $parts);

$stringToSign = str_replace('+', '%20', $stringToSign);

$stringToSign = str_replace(':', '%3A', $stringToSign);

$stringToSign = str_replace(';', urlencode(';'), $stringToSign);

// Sign the request

$signature = hash_hmac("sha256", $stringToSign, $awsSecretKey, TRUE);

// Base64 encode the signature and make it URL safe

$signature = base64_encode($signature);

$signature = str_replace('+', '%2B', $signature);

$signature = str_replace('=', '%3D', $signature);

// Construct the URL

$url = 'http://' . $host . $path . '?' . implode("&", $parts) . "&Signature=" . $signature;

$rawData = file_get_contents($url);

if ( $options['debugMode'] )

robm_dump("raw XML:", htmlentities(str_replace(">", ">\n", $rawData)));

return $rawData;