Proxy.php

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<?php

namespace Rsi\Fred;

/**
 *  Proxy for files that are outside of the public document root.
 */
class Proxy extends Component{

  public $controllerName = 'Proxy'; //!< Controller for the proxy. Has param 'alias'.

  protected $_files = null;

  /**
   * Create a URL for an alias.
   * @param string $alias  Alias for the file.
   * @return string  URL for the proxy call.
   */
  public function url($alias){
    return $this->component('router')->reverse($this->controllerName,\Rsi\File::ext($this->files[$alias]),['alias' => $alias]);
  }
  /**
   * Create a unique alias for a filename.
   * @param string $filename
   * @return string  The generated alias.
   */
  public function alias($filename){
    if(
      array_key_exists($alias = preg_replace('/\\.\w*$/','',basename($filename)),$this->files) &&
      ($this->files[$alias] != $filename)
    ) $alias = md5($filename) . '-' . $alias;
    return $alias;
  }
  /**
   * Add a file to the list.
   * @param string $filename
   * @param string $alias  Alias for the file (a unique alias will be created when empty).
   * @return string  URL for the file.
   */
  public function add($filename,$alias = null){
    if(!$alias) $alias = $this->alias($filename);
    $this->session->files = $this->_files = [$alias => $filename] + $this->files;
    return $this->url($alias);
  }
  /**
   * Serve a file.
   * @param string $alias  Alias for the file.
   */
  public function serve($alias){
    if(!array_key_exists($alias,$this->files)) $this->_fred->externalError("Invalid proxy alias '$alias'");
    header('Content-Type: ' . \Rsi\File::mime($filename = $this->files[$alias]));
    readfile($filename);
    $this->_fred->halt();
  }

  protected function getFiles(){
    if($this->_files === null) $this->_files = $this->session->files ?: $this->config('files',[]);
    return $this->_files;
  }

}