<?php
/**
This is an example of AudioMicro API request using 
Query String Request Authentication Alternative.

More info can be found here: 
@link http://www.audiomicro.com/api/show/authentication/1/
**/

$accessKeyId     = "GAHYUETIETUYAPHAHXAE";
$secretAccessKey = "EIYAEHOHIEY=CAHHAHTHEXIG+EPAESHAHTOXOHCH";
$apiHost         = "api.audiomicro.com";

function getSignature($url, $secret, $expires = '1238598470') {
 $str = "GET\n\n\n{$expires}\n".$url;
 return urlencode(base64_encode(hash_hmac('sha1', $str, $secret, true)));
}

/////////////////////// Browse Category tree ///////////////////

// feed URL, 
$url = "/api/1.1/categories/browse/?CategoryID=2";

// request will expire in 2 days
$expires = strtotime("+2 days");


// generate signature, which will expire in 2 hours
// note, you have to sign only these parameters 'fileID', 'CategoryID', 'Q'
$signature = getSignature($url, $secretAccessKey, $expires);

// generate full URL for content download
$fullUrl   = "http://".$apiHost.$url."&PerPage=25&Format=xml&AccessKeyId=$accessKeyId&Signature=$signature&Expires=$expires";

echo("$fullUrl \r\n\r\n");


////////////////////// Track Details ///////////////////////////////
$url       = "/api/1.1/tracks/info/?fileID=26033";
$signature = getSignature($url, $secretAccessKey, $expires);
$fullUrl   = "http://".$apiHost.$url."&Format=xml&AccessKeyId=$accessKeyId&Signature=$signature&Expires=$expires";

echo("$fullUrl \r\n\r\n");


///////////////////// Search Example /////////////////////////////////
$query     = urlencode("(categoryID:\"173\" AND intervalLength:\"3-4M\" AND tags:\"rock\")");  // you can use "details" field as well
$url       = "/api/1.1/tracks/search/?Q=$query";
$signature = getSignature($url, $secretAccessKey, $expires);
$fullUrl   = "http://".$apiHost.$url."&Format=xml&AccessKeyId=$accessKeyId&Signature=$signature&Expires=$expires";

echo("$fullUrl \r\n\r\n");


//////////////////// receive Track Preview URL /////////////////////////////
$url       = "/api/1.1/tracks/preview/?fileID=26033";
$signature = getSignature($url, $secretAccessKey, $expires);
$fullUrl   = "http://".$apiHost.$url."&Format=xml&AccessKeyId=$accessKeyId&Signature=$signature&Expires=$expires";

echo("$fullUrl \r\n\r\n");


/////////////////// RSS feeds //////////////////////////////////////

$url       = "/api/1.1/rss/new/";
$signature = getSignature($url, $secretAccessKey, $expires);
$fullUrl   = "http://".$apiHost.$url."?AccessKeyId=$accessKeyId&Signature=$signature&Expires=$expires";

echo("$fullUrl \r\n\r\n");

?>