File: application/modules/extensions/aws/Aws/CloudFront/UrlSigner.php

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File: application/modules/extensions/aws/Aws/CloudFront/UrlSigner.php
Role: Application script
Content type: text/plain
Description: Application script
Class: Pretty PHP S3 Files Manager
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Last change:
Date: 4 years ago
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<?php
namespace Aws\CloudFront;

use
GuzzleHttp\Psr7;
use
GuzzleHttp\Psr7\Uri;
use
Psr\Http\Message\UriInterface;

/**
 * Creates signed URLs for Amazon CloudFront resources.
 */
class UrlSigner
{
    private
$signer;

   
/**
     * @param $keyPairId string ID of the key pair
     * @param $privateKey string Path to the private key used for signing
     *
     * @throws \RuntimeException if the openssl extension is missing
     * @throws \InvalidArgumentException if the private key cannot be found.
     */
   
public function __construct($keyPairId, $privateKey)
    {
       
$this->signer = new Signer($keyPairId, $privateKey);
    }

   
/**
     * Create a signed Amazon CloudFront URL.
     *
     * Keep in mind that URLs meant for use in media/flash players may have
     * different requirements for URL formats (e.g. some require that the
     * extension be removed, some require the file name to be prefixed
     * - mp4:<path>, some require you to add "/cfx/st" into your URL).
     *
     * @param string $url URL to sign (can include query
     * string string and wildcards)
     * @param string|integer|null $expires UTC Unix timestamp used when signing
     * with a canned policy. Not required
     * when passing a custom $policy.
     * @param string $policy JSON policy. Use this option when
     * creating a signed URL for a custom
     * policy.
     *
     * @return string The file URL with authentication parameters
     * @throws \InvalidArgumentException if the URL provided is invalid
     * @link http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/WorkingWithStreamingDistributions.html
     */
   
public function getSignedUrl($url, $expires = null, $policy = null)
    {
       
// Determine the scheme of the url
       
$urlSections = explode('://', $url);

        if (
count($urlSections) < 2) {
            throw new \
InvalidArgumentException("Invalid URL: {$url}");
        }

       
// Get the real scheme by removing wildcards from the scheme
       
$scheme = str_replace('*', '', $urlSections[0]);
       
$uri = new Uri($scheme . '://' . $urlSections[1]);
       
$query = Psr7\parse_query($uri->getQuery(), PHP_QUERY_RFC3986);
       
$signature = $this->signer->getSignature(
           
$this->createResource($scheme, (string) $uri),
           
$expires,
           
$policy
       
);
       
$uri = $uri->withQuery(
           
http_build_query($query + $signature, null, '&', PHP_QUERY_RFC3986)
        );

        return
$scheme === 'rtmp'
           
? $this->createRtmpUrl($uri)
            : (string)
$uri;
    }

    private function
createRtmpUrl(UriInterface $uri)
    {
       
// Use a relative URL when creating Flash player URLs
       
$result = ltrim($uri->getPath(), '/');

        if (
$query = $uri->getQuery()) {
           
$result .= '?' . $query;
        }

        return
$result;
    }

   
/**
     * @param $scheme
     * @param $url
     *
     * @return string
     */
   
private function createResource($scheme, $url)
    {
        switch (
$scheme) {
            case
'http':
            case
'http*':
            case
'https':
                return
$url;
            case
'rtmp':
               
$parts = parse_url($url);
               
$pathParts = pathinfo($parts['path']);
               
$resource = ltrim(
                   
$pathParts['dirname'] . '/' . $pathParts['basename'],
                   
'/'
               
);

               
// Add a query string if present.
               
if (isset($parts['query'])) {
                   
$resource .= "?{$parts['query']}";
                }

                return
$resource;
        }

        throw new \
InvalidArgumentException("Invalid URI scheme: {$scheme}. "
           
. "Scheme must be one of: http, https, or rtmp");
    }
}


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