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efrain |
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<?php
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namespace Aws\CloudFront;
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use GuzzleHttp\Psr7;
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use GuzzleHttp\Psr7\Uri;
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use Psr\Http\Message\UriInterface;
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/**
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* Creates signed URLs for Amazon CloudFront resources.
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*/
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class UrlSigner
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{
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private $signer;
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/**
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* @param $keyPairId string ID of the key pair
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* @param $privateKey string Path to the private key used for signing
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*
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* @throws \RuntimeException if the openssl extension is missing
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* @throws \InvalidArgumentException if the private key cannot be found.
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*/
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public function __construct($keyPairId, $privateKey)
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{
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$this->signer = new Signer($keyPairId, $privateKey);
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}
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/**
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* Create a signed Amazon CloudFront URL.
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*
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* Keep in mind that URLs meant for use in media/flash players may have
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* different requirements for URL formats (e.g. some require that the
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* extension be removed, some require the file name to be prefixed
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* - mp4:<path>, some require you to add "/cfx/st" into your URL).
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*
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* @param string $url URL to sign (can include query
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* string string and wildcards)
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* @param string|integer|null $expires UTC Unix timestamp used when signing
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* with a canned policy. Not required
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* when passing a custom $policy.
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* @param string $policy JSON policy. Use this option when
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* creating a signed URL for a custom
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* policy.
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*
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* @return string The file URL with authentication parameters
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* @throws \InvalidArgumentException if the URL provided is invalid
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* @link http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/WorkingWithStreamingDistributions.html
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*/
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public function getSignedUrl($url, $expires = null, $policy = null)
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{
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// Determine the scheme of the url
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$urlSections = explode('://', $url);
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if (count($urlSections) < 2) {
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throw new \InvalidArgumentException("Invalid URL: {$url}");
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}
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// Get the real scheme by removing wildcards from the scheme
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$scheme = str_replace('*', '', $urlSections[0]);
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$uri = new Uri($scheme . '://' . $urlSections[1]);
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$query = Psr7\Query::parse($uri->getQuery(), PHP_QUERY_RFC3986);
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$signature = $this->signer->getSignature(
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$this->createResource($scheme, (string) $uri),
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$expires,
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$policy
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);
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$uri = $uri->withQuery(
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http_build_query($query + $signature, '', '&', PHP_QUERY_RFC3986)
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);
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return $scheme === 'rtmp'
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? $this->createRtmpUrl($uri)
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: (string) $uri;
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}
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private function createRtmpUrl(UriInterface $uri)
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{
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// Use a relative URL when creating Flash player URLs
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$result = ltrim($uri->getPath(), '/');
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if ($query = $uri->getQuery()) {
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$result .= '?' . $query;
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}
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return $result;
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}
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/**
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* @param $scheme
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* @param $url
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*
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* @return string
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*/
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private function createResource($scheme, $url)
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{
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switch ($scheme) {
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case 'http':
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case 'http*':
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case 'https':
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return $url;
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case 'rtmp':
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$parts = parse_url($url);
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$pathParts = pathinfo($parts['path']);
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$resource = ltrim(
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$pathParts['dirname'] . '/' . $pathParts['basename'],
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'/'
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);
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// Add a query string if present.
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if (isset($parts['query'])) {
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$resource .= "?{$parts['query']}";
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}
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return $resource;
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}
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throw new \InvalidArgumentException("Invalid URI scheme: {$scheme}. "
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. "Scheme must be one of: http, https, or rtmp");
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}
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}
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