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diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
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index 000000000..2cb83071a
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+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
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+<?php
+
+namespace Sabre\DAVACL\PrincipalBackend;
+
+/**
+ * Implement this interface to create your own principal backends.
+ *
+ * Creating backends for principals is entirely optional. You can also
+ * implement Sabre\DAVACL\IPrincipal directly. This interface is used solely by
+ * Sabre\DAVACL\AbstractPrincipalCollection.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface BackendInterface {
+
+    /**
+     * Returns a list of principals based on a prefix.
+     *
+     * This prefix will often contain something like 'principals'. You are only
+     * expected to return principals that are in this base path.
+     *
+     * You are expected to return at least a 'uri' for every user, you can
+     * return any additional properties if you wish so. Common properties are:
+     *   {DAV:}displayname
+     *   {http://sabredav.org/ns}email-address - This is a custom SabreDAV
+     *     field that's actually injected in a number of other properties. If
+     *     you have an email address, use this property.
+     *
+     * @param string $prefixPath
+     * @return array
+     */
+    function getPrincipalsByPrefix($prefixPath);
+
+    /**
+     * Returns a specific principal, specified by it's path.
+     * The returned structure should be the exact same as from
+     * getPrincipalsByPrefix.
+     *
+     * @param string $path
+     * @return array
+     */
+    function getPrincipalByPath($path);
+
+    /**
+     * Updates one ore more webdav properties on a principal.
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param string $path
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
+     */
+    function updatePrincipal($path, \Sabre\DAV\PropPatch $propPatch);
+
+    /**
+     * This method is used to search for principals matching a set of
+     * properties.
+     *
+     * This search is specifically used by RFC3744's principal-property-search
+     * REPORT.
+     *
+     * The actual search should be a unicode-non-case-sensitive search. The
+     * keys in searchProperties are the WebDAV property names, while the values
+     * are the property values to search on.
+     *
+     * By default, if multiple properties are submitted to this method, the
+     * various properties should be combined with 'AND'. If $test is set to
+     * 'anyof', it should be combined using 'OR'.
+     *
+     * This method should simply return an array with full principal uri's.
+     *
+     * If somebody attempted to search on a property the backend does not
+     * support, you should simply return 0 results.
+     *
+     * You can also just return 0 results if you choose to not support
+     * searching at all, but keep in mind that this may stop certain features
+     * from working.
+     *
+     * @param string $prefixPath
+     * @param array $searchProperties
+     * @param string $test
+     * @return array
+     */
+    function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof');
+
+    /**
+     * Finds a principal by its URI.
+     *
+     * This method may receive any type of uri, but mailto: addresses will be
+     * the most common.
+     *
+     * Implementation of this API is optional. It is currently used by the
+     * CalDAV system to find principals based on their email addresses. If this
+     * API is not implemented, some features may not work correctly.
+     *
+     * This method must return a relative principal path, or null, if the
+     * principal was not found or you refuse to find it.
+     *
+     * @param string $uri
+     * @param string $principalPrefix
+     * @return string
+     */
+    function findByUri($uri, $principalPrefix);
+
+    /**
+     * Returns the list of members for a group-principal
+     *
+     * @param string $principal
+     * @return array
+     */
+    function getGroupMemberSet($principal);
+
+    /**
+     * Returns the list of groups a principal is a member of
+     *
+     * @param string $principal
+     * @return array
+     */
+    function getGroupMembership($principal);
+
+    /**
+     * Updates the list of group members for a group principal.
+     *
+     * The principals should be passed as a list of uri's.
+     *
+     * @param string $principal
+     * @param array $members
+     * @return void
+     */
+    function setGroupMemberSet($principal, array $members);
+
+}