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diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/ProxyRead.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/ProxyRead.php
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+<?php
+
+namespace Sabre\CalDAV\Principal;
+use Sabre\DAVACL;
+use Sabre\DAV;
+
+/**
+ * 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) 2007-2013 fruux GmbH (https://fruux.com/).
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://code.google.com/p/sabredav/wiki/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.
+ *
+ * @param DAVACL\PrincipalBackend\BackendInterface $principalBackend
+ * @param array $principalInfo
+ */
+ 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
+ *
+ * @return null
+ */
+ public function getLastModified() {
+
+ return null;
+
+ }
+
+ /**
+ * Deletes the current node
+ *
+ * @throws DAV\Exception\Forbidden
+ * @return void
+ */
+ public function delete() {
+
+ throw new DAV\Exception\Forbidden('Permission denied to delete node');
+
+ }
+
+ /**
+ * Renames the node
+ *
+ * @throws DAV\Exception\Forbidden
+ * @param string $name The new name
+ * @return void
+ */
+ public function setName($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 array();
+
+ }
+
+ /**
+ * 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.
+ *
+ * @param array $principals
+ * @return void
+ */
+ 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();
+
+ }
+
+}