<?php

namespace Sabre\CalDAV\Principal;

use Sabre\DAV;
use Sabre\DAVACL;

/**
 * ProxyRead principal.
 *
 * This class represents a principal group, hosted under the main principal.
 * This is needed to implement 'Calendar delegation' support. This class is
 * instantiated by User.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class ProxyRead implements IProxyRead
{
    /**
     * Principal information from the parent principal.
     *
     * @var array
     */
    protected $principalInfo;

    /**
     * Principal backend.
     *
     * @var DAVACL\PrincipalBackend\BackendInterface
     */
    protected $principalBackend;

    /**
     * Creates the object.
     *
     * Note that you MUST supply the parent principal information.
     */
    public function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo)
    {
        $this->principalInfo = $principalInfo;
        $this->principalBackend = $principalBackend;
    }

    /**
     * Returns this principals name.
     *
     * @return string
     */
    public function getName()
    {
        return 'calendar-proxy-read';
    }

    /**
     * Returns the last modification time.
     */
    public function getLastModified()
    {
        return null;
    }

    /**
     * Deletes the current node.
     *
     * @throws DAV\Exception\Forbidden
     */
    public function delete()
    {
        throw new DAV\Exception\Forbidden('Permission denied to delete node');
    }

    /**
     * Renames the node.
     *
     * @param string $name The new name
     *
     * @throws DAV\Exception\Forbidden
     */
    public function setName($name)
    {
        throw new DAV\Exception\Forbidden('Permission denied to rename file');
    }

    /**
     * Returns a list of alternative urls for a principal.
     *
     * This can for example be an email address, or ldap url.
     *
     * @return array
     */
    public function getAlternateUriSet()
    {
        return [];
    }

    /**
     * Returns the full principal url.
     *
     * @return string
     */
    public function getPrincipalUrl()
    {
        return $this->principalInfo['uri'].'/'.$this->getName();
    }

    /**
     * Returns the list of group members.
     *
     * If this principal is a group, this function should return
     * all member principal uri's for the group.
     *
     * @return array
     */
    public function getGroupMemberSet()
    {
        return $this->principalBackend->getGroupMemberSet($this->getPrincipalUrl());
    }

    /**
     * Returns the list of groups this principal is member of.
     *
     * If this principal is a member of a (list of) groups, this function
     * should return a list of principal uri's for it's members.
     *
     * @return array
     */
    public function getGroupMembership()
    {
        return $this->principalBackend->getGroupMembership($this->getPrincipalUrl());
    }

    /**
     * Sets a list of group members.
     *
     * If this principal is a group, this method sets all the group members.
     * The list of members is always overwritten, never appended to.
     *
     * This method should throw an exception if the members could not be set.
     */
    public function setGroupMemberSet(array $principals)
    {
        $this->principalBackend->setGroupMemberSet($this->getPrincipalUrl(), $principals);
    }

    /**
     * Returns the displayname.
     *
     * This should be a human readable name for the principal.
     * If none is available, return the nodename.
     *
     * @return string
     */
    public function getDisplayName()
    {
        return $this->getName();
    }
}
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