<?php
//existing bucket name
define('BUCKET_NAME','username_delcache');

//access and secret keys for your s3 account
define('S3_ACCESS_KEY','accesskey');
define('S3_SECRET_KEY','secretkey');

// pear installed goodness
require_once 'Crypt/HMAC.php';
require_once 'HTTP/Request.php';

//other s3 settings
define('S3_URL',"http://s3.amazonaws.com/");
define('ACL_SETTING','public-read');

//the date and time in rfc 822
$rfc_822_datetime = date("r");

//you del.icio.us RSS feed
define('MY_FEED_URL','http://del.icio.us/rss/YOURNAME');

//bring in magpie goodness
require_once('lib/rss_fetch.inc');

//set cache directory
define('MAGPIE_CACHE_DIR', 'cache');

$rss = fetch_rss(MY_FEED_URL);

//create and/or update the cache for each item
foreach ($rss->items as $item) {
    $file_key = md5($item['link']);

    //get the contents of the file you want to cache
    $req =& new HTTP_Request($item['link']);
    $req->sendRequest();
    $response_code = $req->getResponseCode();
    $file_content_type = $req->getResponseHeader('content-type');
    $file_contents = $req->getResponseBody();

    //if there is a response body, create the cache
    if($file_contents != '')
    {    
        //assemble your s3 signature
        $s3_signature = 
            "PUT\n\n".$content_type."\n".$rfc_822_datetime
            ."\nx-amz-acl:".ACL_SETTING."\n/".BUCKET_NAME."/".$file_key;
        $hasher =& new Crypt_HMAC(S3_SECRET_KEY, "sha1");
        $signature = hex2b64($hasher->hash($s3_signature));

        //make the request to create the file in the bucket
        $s3req =& new HTTP_Request(S3_URL.BUCKET_NAME."/".$file_key);
        $s3req->setMethod('PUT');
        $s3req->addHeader("content-type", $content_type);
        $s3req->addHeader("Date", $rfc_822_datetime);
        $s3req->addHeader("x-amz-acl", ACL_SETTING);
        $s3req->addHeader("Authorization", "AWS " . S3_ACCESS_KEY . ":" .
            $signature);
        $s3req->setBody($file_contents);
        $s3req->sendRequest();
        
        if ($s3req->getResponseCode() == 200) {
            echo "Cache updated for ".$item['link']." (".$file_key.")\n";
        } else {
            echo "Problem updating cache for ".$item['link']." (".$file_key.") - Status was ".$s3req->getResponseCode()."\n";
        }

    } else {
        //handle any snoopy errors by outputting them to the screen
        echo "Problem fetching ".$item['link']." (".$file_key."): "
.$req->getResponseCode()."\n";
    }
    
}

function hex2b64($str) {
    $raw = '';
    for ($i=0; $i < strlen($str); $i+=2) {
        $raw .= chr(hexdec(substr($str, $i, 2)));
    }
    return base64_encode($raw);
}

?>