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<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

// -------------------------------------------------------------------------------------------------
/**
 * Amazon Product Advertising API library
 * 
 * This is a very basic libary allowing you to search the Amazon Product Advertising API
 *
 * Based on and inspired by original CI Amazon library by Zac G. (<a href="http://zgordon.org">http://zgordon.org</a>) and on code by Richard Cummings (<a href="http://richardcummings.info/the-request-must-contain-the-parameter-signature-quick-fix-for-your-php-rest-requests/">http://richardcummings.info/the-request-must-contain-the-parameter-signature-quick-fix-for-your-php-rest-requests/</a>)
 *
 * @package        CodeIgniter
 * @subpackage    Libraries
 * @author        johnnytoobad <http://ellislab.com/forums/member/88806>    
 * @version        2.0
 * @license        <a href="http://www.opensource.org/licenses/bsd-license.php">http://www.opensource.org/licenses/bsd-license.php</a> BSD licensed.
 *
 */
// -------------------------------------------------------------------------------------------------


class Amazon_api
{

    function Amazon_api()
    {
        $this->ci =& get_instance();
    }

    
    function search_amazon($keywords, $item_page)
    {   

        //You Amazon API keys
        $aws_access_key_id = 'XXXXXXXXXXXXXXXXXXX';
        $aws_secret_access_key = 'XXXXXXXXXXXXXXXXXXXXX';
         
        $base_url = 'http://ecs.amazonaws.com/onca/xml?Service=AWSECommerceService&AWSAccessKeyId;=' . $aws_access_key_id . '&';
        
        //Set parameters for API search, see AWS documentation for a detailed list of parameters
        $url_params = array(
            'Operation'=>'ItemSearch',
            'ItemPage'=>$item_page,
            'AssociateTag'=>'YOUR-ASSOCIATE-TAG',
            'Version'=>'2006-09-11',
            'ResponseGroup'=>'Images,ItemAttributes,EditorialReview',
             'SearchIndex'=>'Books',
             'Keywords'=>rawurlencode($keywords)
         );
         
        //Sort the URL parameters
        $url_parts = array();
        foreach(array_keys($url_params) as $key)
            $url_parts[] = $key."=".$url_params[$key];
        sort($url_parts);
        
        //Build and encode the request URL
        $url = $base_url . implode('&',$url_parts);
        $host = parse_url($base_url . implode('&',$url_parts),PHP_URL_HOST);
        $timestamp = gmstrftime('%Y-%m-%dT%H:%M:%S.000Z');
        $url = $url. '&Timestamp;=' . $timestamp;
        $paramstart = strpos($url,'?');
        $workurl = substr($url,$paramstart+1);
        $workurl = str_replace(",",",",$workurl);
        $workurl = str_replace(":",":",$workurl);
        $params = explode("&",$workurl);
        sort($params);
        $signstr = "GET\n" . $host . "\n/onca/xml\n" . implode("&",$params);
        $signstr = base64_encode(hash_hmac('sha256', $signstr, $aws_secret_access_key, true));
        $signstr = urlencode($signstr);
        $signedurl = $url . "&Signature;=" . $signstr;
        $request = $signedurl;    
        
        //Send request to AWS
        $session = curl_init($request);
        curl_setopt($session, CURLOPT_HEADER, false);
        curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
        $response = curl_exec($session);
        curl_close($session); 
        $parsed_xml = simplexml_load_string($response);
        
        //Return parsed Amazon data
        return $parsed_xml;                
    }

}
?>

<?php

class Books extends Controller {

    function Books()
    {
        parent::Controller();    
        $this->load->library('amazon_api');
        $this->load->helper('form');
        $this->load->library('pagination');

    }
    
    function index()
    {
        $this->search_amazon();
    }

    function search_amazon($keywords = NULL, $offset = 0)
    {
        //Check if keywords have been submitted via the input
        if($this->input->post('keywords')) {
            $keywords = $this->input->post('keywords');
        }
        
        //If keywords have been entered        
        if ($keywords) {
        
            //Convert CI pagination values to Amazon API ItemPage values
            $page_number = ($offset/10)+1;

            //Calls search_amazon method
            $search_results = $this->amazon_api->search_amazon($keywords, $page_number);        
            
            //Configure and initialize pagination        
            $config = array (
                'base_url' => base_url() . 'books/search_amazon/' . $keywords,
                'total_rows' => $search_results->Items->TotalResults,
                'uri_segment' => 4,
                'per_page' => '10'
            ); 
            $this->pagination->initialize($config); 
            
            $data = array(
                'search_results' => $search_results,
                'title' => 'Results From Amazon Search',
                'keywords' => $keywords,
                'total_pages' => round($search_results->Items->TotalResults/10),
                'page_number' => $page_number,
                'pagination' => $this->pagination->create_links()
            );
        
        //No keywords have been enetred
        } else {
        
            $data = array(
                'title' => 'Results From Amazon Search', 
                'error_message' => 'Please enter in a search term'
            );
        }
        
        //Load the views and pass the data
        $this->load->view('find-books', $data);        
    }

}

<?php
//If page is displaying a search result, include that information
//at the top of the page.  If not, then just display instructions
//for searching Amazon Database.    
if (isset($keywords)) {
    echo "<h2>Search Results For \"". $keywords ."\"</h2><p>";<br />
    echo "Go back to the \"". anchor('books', 'Find Books')."\" page. Search again below.";<br />
}else if (isset($error_message)) {<br />
    echo "</p><h2>".$title."</h2><p>";<br />
    echo "".$error_message.".";<br />
} else {<br />
    echo "</p><h2>".$title."</h2><p>";<br />
    echo "In the search field below type the name of a <em>teacher</em>, <em>author</em>, or <em>book title</em>.";<br />
}    </p>

<p>//Check if search keywords are present<br />
if (!isset($keywords)) { $keywords = ''; }<br />
$keyword_input = array(<br />
    'name'    => 'keywords',<br />
    'id'    => 'keywords',<br />
    'size'    => 20,<br />
    'value' =>  set_value('keywords', $keywords )<br />
);<br />
$form_attributes = array(<br />
    'class' => 'search-form', <br />
    'id' => 'search-form', <br />
    'name' => 'search_terms'<br />
);</p>

<p>// Set attributes for the form<br />
echo form_open('books/search_amazon', $form_attributes); <br />
// Set attributes for the input field<br />
echo form_input($keyword_input);<br />
// Set attributes for the submit field<br />
echo form_submit('submit_button', 'Search Amazon!');<br />
echo '</form>';<br />
?></p>

<p><?php if (isset($search_results)): // Check to see if $search_results has been passed ?><br />
Page: <?= $page_number ?> of <?= $total_pages ?><br />
<?= (isset($pagination)) ? $pagination: ''; ?><br />
    <ul class="books"><br />
        <?php foreach($search_results->Items->Item as $book): //Loop through results ?><br />
            <li><br />
                Title: <a >DetailPageURL ?>" title=""><?=$book->ItemAttributes->Title //Echo title of book ?></a><br><br />
                Author: <i><?=$book->ItemAttributes->Author // Echo author of book ?></i><br><br />
                <img >MediumImage->URL //Link to Thumbnail ?>" alt="Cover of <?=$book->ItemAttributes->Title //Add title of book to alt attribute ?>" class="image-thumbnail" border="1" ><br />
            </li><br />
        <?php endforeach; ?><br />
    </ul><br />
<?= (isset($pagination)) ? $pagination: ''; ?><br />
<?php endif; ?>