Ok, no answers so I gave up with the brightscript bit, couldn't figure out how to do the base64_encode part in brightscript. So I hosted my XML feeds on a linux host and created a PHP page that produces the category feed and runs a function that creates the signed AWS S3 expiring links based upon work by Tournas Dimitrios
https://tournasdimitrios1.wordpress.com/2012/12/04/how-to-create-expiring-links-for-amazons-s3-with-php/. Only a few tweaks to the function to switch the organization of the URL and use & instead of &'s for the XML. The result turned out nicely, just fill in the variables with your specific info and Video files and point the categories feed to the php page.
Category1.php
<?php
// Set header content type for XML for proper browser render
header('Content-Type: text/xml');
// ** EDIT VARIABLES BELOW **
// Set Variables
$genre = "Documentary";
$type = "Video";
$bucketName = "Your S3 Bucket" ;
$awsAccessKey = "Your AWS Access Key" ;
$awsSecretKey = "Your AWS Secret Key" ;
//Build Array of Video Items
$xmlContent = array (
array ( "title" => "Title 1",
"desc" => "Description 1",
"sdImg" => "http://Image1.url",
"vidFile" => "/path/videofile1.mp4"),
array ( "title" => "Title 2",
"desc" => "Description 2",
"sdImg" => "http://Image2.url",
"vidFile" => "/path/videofile3.mp4"),
array ( "title" => "Title 3",
"desc" => "Description 3",
"sdImg" => "http://Image3.url",
"vidFile" => "/path/videofile3.mp4")
);
// ** FINISHED EDITING VARIABLES**
// Echo initial part or XML document
echo '<?xml version="1.0" encoding="UTF-8"?>';
echo '<feed>';
// Loop through the rest of the XML document filling in variables
$count = 1;
foreach ($xmlContent as $video) {
// Call function to produce expiring signed AWS S3 URL
$objectPath = $video[vidFile] ;
$s3URL = s3TempLink("$awsAccessKey" , "$awsSecretKey", "$bucketName", "$objectPath") ;
echo ' <item sdImg="'. $video[sdImg] .'" hdImg="'. $video[sdImg] .'">';
echo ' <title>'. $video[title] .'</title>';
echo ' <contentType>'. $type .'</contentType>';
echo ' <contentId>'. $count .'</contentId>';
echo ' <media>';
echo ' <streamFormat>mp4</streamFormat>';
echo ' <streamQuality>SD</streamQuality>';
echo ' <streamUrl>'. $s3URL .'</streamUrl>';
echo ' </media>';
echo ' <media>';
echo ' <streamFormat>mp4</streamFormat>';
echo ' <streamQuality>HD</streamQuality>';
echo ' <streamUrl>'. $s3URL .'</streamUrl>';
echo ' </media>';
echo ' <synopsis>'. $video[desc] .'</synopsis>';
echo ' <genres>'. $genre .'</genres>';
echo ' </item>';
$count++;
}
// Echo last part of XML document
echo '</feed>';
// Function to create signed expiring AWS S3 link Original by Tournas Dimitrios
//Reference Link: https://tournasdimitrios1.wordpress.com/2012/12/04/how-to-create-expiring-links-for-amazons-s3-with-php/
function s3TempLink($awsAccessKey, $awsSecretKey, $bucketName , $objectPath , $expires = 5) {
// Calculating expiry time
$expires = time() + ($expires * 60) ;
$objectPath = ltrim($objectPath, '/') ;
$signature = "GET\n\n\n$expires\n".'/'.$bucketName.'/'.$objectPath ;
// Calculating HMAC-sha1
$hashedSignature = base64_encode(hash_hmac('sha1' ,$signature , $awsSecretKey , true )) ;
// Constructing the URL
$url = sprintf('http://s3.amazonaws.com/%s/%s', $bucketName , $objectPath);
// Constructing the query String
$queryString = http_build_query( array(
'AWSAccessKeyId' => $awsAccessKey ,
'Expires' => $expires ,
'Signature' => $hashedSignature
), '', '&');
// Apending query string to URL
return $url.'?'.$queryString ;
}
?>
Cheers!
Mark-
