CodeIgniter Forums
Updated: Amazon Services API Library - Printable Version

+- CodeIgniter Forums (https://forum.codeigniter.com)
+-- Forum: Archived Discussions (https://forum.codeigniter.com/forumdisplay.php?fid=20)
+--- Forum: Archived Libraries & Helpers (https://forum.codeigniter.com/forumdisplay.php?fid=22)
+--- Thread: Updated: Amazon Services API Library (/showthread.php?tid=27328)

Updated: Amazon Services API Library - El Forum - 02-07-2010

[eluser]johnnytoobad[/eluser]
I found a basic Amazon Product Advertising API (APAA) library here: http://codeigniter.com/wiki/Amazon_Services_API_Integration/

However since last year APAA has required a signature, which has broken this code. I used it as a based, fixed the signature issue, cleaned up the code and introduced the CI pagination class. Since I used this code to get started I thought it was only fair to post my working updated library here in case someone else finds it useful.

My questions here are;
1) I'm only a beginner so if someone more experienced has a second to cast their eye over the code, i would be grateful. Just to make sure i haven't made any outrageous errors
2) Whats the etiquette regarding posting this to the wiki, should I update the old non-working page or create something new?


Here is my code (also attached):

Amazon_api.php (library)
Code:
<?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. (http://zgordon.org) and on code by Richard Cummings (http://richardcummings.info/the-request-must-contain-the-parameter-signature-quick-fix-for-your-php-rest-requests/)
*
* @package        CodeIgniter
* @subpackage    Libraries
* @author        johnnytoobad <http://ellislab.com/forums/member/88806/>    
* @version        2.0
* @license        http://www.opensource.org/licenses/bsd-license.php 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;                
    }

}
?&gt;


Updated: Amazon Services API Library - El Forum - 02-07-2010

[eluser]johnnytoobad[/eluser]
books.php Controller
Code:
&lt;?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);        
    }

}

find-books.php (view)
Code:
&lt;?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 \"". $keywords ."\"</h2>";
    echo "<p>Go back to the \"". anchor('books', 'Find Books')."\" page. Search again below.</p>";
}else if (isset($error_message)) {
    echo "<h2>".$title."</h2>";
    echo "<p>".$error_message.".</p>";
} else {
    echo "<h2>".$title."</h2>";
    echo "<p>In the search field below type the name of a <em>teacher</em>, <em>author</em>, or <em>book title</em>.</p>";
}    

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

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

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


Updated: Amazon Services API Library - El Forum - 03-24-2010

[eluser]nandish[/eluser]
Hi

How can i get more than 10 rows or all result in one page

Thanks In Advance