<?php

  namespace Sabre\CalDAV\Principal;
  use Sabre\DAV;
  use Sabre\DAVACL;

  /**
   * CalDAV principal
   *
   * This is a standard user-principal for CalDAV. This principal is also a
   * collection and returns the caldav-proxy-read and caldav-proxy-write child
   * principals.
   *

   * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
   * @author Evert Pot (http://evertpot.com/)
   * @license http://sabre.io/license/ Modified BSD License

   */

  class User extends DAVACL\Principal implements DAV\ICollection {

  
      /**
       * Creates a new file in the directory
       *
       * @param string $name Name of the file
       * @param resource $data Initial payload, passed as a readable stream resource.

       * @throws DAV\Exception\Forbidden

       * @return void
       */
      public function createFile($name, $data = null) {

          throw new DAV\Exception\Forbidden('Permission denied to create file (filename ' . $name . ')');

  
      }
  
      /**
       * Creates a new subdirectory
       *
       * @param string $name

       * @throws DAV\Exception\Forbidden

       * @return void
       */
      public function createDirectory($name) {

          throw new DAV\Exception\Forbidden('Permission denied to create directory');

  
      }
  
      /**
       * Returns a specific child node, referenced by its name
       *
       * @param string $name

       * @return DAV\INode

       */
      public function getChild($name) {
  
          $principal = $this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/' . $name);
          if (!$principal) {

              throw new DAV\Exception\NotFound('Node with name ' . $name . ' was not found');

          }
          if ($name === 'calendar-proxy-read')

              return new ProxyRead($this->principalBackend, $this->principalProperties);

  
          if ($name === 'calendar-proxy-write')

              return new ProxyWrite($this->principalBackend, $this->principalProperties);

          throw new DAV\Exception\NotFound('Node with name ' . $name . ' was not found');

  
      }
  
      /**
       * Returns an array with all the child nodes
       *

      * @return DAV\INode[]

       */
      public function getChildren() {
  
          $r = array();
          if ($this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/calendar-proxy-read')) {

              $r[] = new ProxyRead($this->principalBackend, $this->principalProperties);

          }
          if ($this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/calendar-proxy-write')) {

              $r[] = new ProxyWrite($this->principalBackend, $this->principalProperties);

          }
  
          return $r;
  
      }
  
      /**
       * Returns whether or not the child node exists
       *
       * @param string $name
       * @return bool
       */
      public function childExists($name) {
  
          try {
              $this->getChild($name);
              return true;

          } catch (DAV\Exception\NotFound $e) {

              return false;
          }
  
      }
  
      /**
       * Returns a list of ACE's for this node.
       *
       * Each ACE has the following properties:
       *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
       *     currently the only supported privileges
       *   * 'principal', a url to the principal who owns the node
       *   * 'protected' (optional), indicating that this ACE is not allowed to
       *      be updated.
       *
       * @return array
       */
      public function getACL() {
  
          $acl = parent::getACL();
          $acl[] = array(
              'privilege' => '{DAV:}read',
              'principal' => $this->principalProperties['uri'] . '/calendar-proxy-read',
              'protected' => true,
          );
          $acl[] = array(
              'privilege' => '{DAV:}read',
              'principal' => $this->principalProperties['uri'] . '/calendar-proxy-write',
              'protected' => true,
          );
          return $acl;
  
      }
  
  }