AmazonS3ResourceManager.php
public function getUrl($name, $expires = NULL)
	{
		return $this->getClient()->getObjectUrl($this->bucket, $name, $expires);
	}
public function getUrl($name, $expires = NULL)
	{
		return $this->getClient()->getObjectUrl($this->bucket, $name, $expires);
	}
Returns the url of the file or empty string if the file does not exists.
@param string $name the key name of the file to access
@param mixed $expires The time at which the URL should expire
@return string