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friendica-addons/dav/SabreDAV/lib/Sabre/DAVACL/Plugin.php

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Initial Release of the calendar plugin
2012-06-03 14:19:28 -04:00
<?php
/**
* SabreDAV ACL Plugin
*
* This plugin provides functionality to enforce ACL permissions.
* ACL is defined in RFC3744.
*
* In addition it also provides support for the {DAV:}current-user-principal
* property, defined in RFC5397 and the {DAV:}expand-property report, as
* defined in RFC3253.
*
* @package Sabre
* @subpackage DAVACL
* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_DAVACL_Plugin extends Sabre_DAV_ServerPlugin {
/**
* Recursion constants
*
* This only checks the base node
*/
const R_PARENT = 1;
/**
* Recursion constants
*
* This checks every node in the tree
*/
const R_RECURSIVE = 2;
/**
* Recursion constants
*
* This checks every parentnode in the tree, but not leaf-nodes.
*/
const R_RECURSIVEPARENTS = 3;
/**
* Reference to server object.
*
* @var Sabre_DAV_Server
*/
protected $server;
/**
* List of urls containing principal collections.
* Modify this if your principals are located elsewhere.
*
* @var array
*/
public $principalCollectionSet = array(
'principals',
);
/**
* By default ACL is only enforced for nodes that have ACL support (the
* ones that implement Sabre_DAVACL_IACL). For any other node, access is
* always granted.
*
* To override this behaviour you can turn this setting off. This is useful
* if you plan to fully support ACL in the entire tree.
*
* @var bool
*/
public $allowAccessToNodesWithoutACL = true;
/**
* By default nodes that are inaccessible by the user, can still be seen
* in directory listings (PROPFIND on parent with Depth: 1)
*
* In certain cases it's desirable to hide inaccessible nodes. Setting this
* to true will cause these nodes to be hidden from directory listings.
*
* @var bool
*/
public $hideNodesFromListings = false;
/**
* This string is prepended to the username of the currently logged in
* user. This allows the plugin to determine the principal path based on
* the username.
*
* @var string
*/
public $defaultUsernamePath = 'principals';
/**
* This list of properties are the properties a client can search on using
* the {DAV:}principal-property-search report.
*
* The keys are the property names, values are descriptions.
*
* @var array
*/
public $principalSearchPropertySet = array(
'{DAV:}displayname' => 'Display name',
'{http://sabredav.org/ns}email-address' => 'Email address',
);
/**
* Any principal uri's added here, will automatically be added to the list
* of ACL's. They will effectively receive {DAV:}all privileges, as a
* protected privilege.
*
* @var array
*/
public $adminPrincipals = array();
/**
* Returns a list of features added by this plugin.
*
* This list is used in the response of a HTTP OPTIONS request.
*
* @return array
*/
public function getFeatures() {
return array('access-control');
}
/**
* Returns a list of available methods for a given url
*
* @param string $uri
* @return array
*/
public function getMethods($uri) {
return array('ACL');
}
/**
* Returns a plugin name.
*
* Using this name other plugins will be able to access other plugins
* using Sabre_DAV_Server::getPlugin
*
* @return string
*/
public function getPluginName() {
return 'acl';
}
/**
* Returns a list of reports this plugin supports.
*
* This will be used in the {DAV:}supported-report-set property.
* Note that you still need to subscribe to the 'report' event to actually
* implement them
*
* @param string $uri
* @return array
*/
public function getSupportedReportSet($uri) {
return array(
'{DAV:}expand-property',
'{DAV:}principal-property-search',
'{DAV:}principal-search-property-set',
);
}
/**
* Checks if the current user has the specified privilege(s).
*
* You can specify a single privilege, or a list of privileges.
* This method will throw an exception if the privilege is not available
* and return true otherwise.
*
* @param string $uri
* @param array|string $privileges
* @param int $recursion
* @param bool $throwExceptions if set to false, this method won't through exceptions.
* @throws Sabre_DAVACL_Exception_NeedPrivileges
* @return bool
*/
public function checkPrivileges($uri, $privileges, $recursion = self::R_PARENT, $throwExceptions = true) {
if (!is_array($privileges)) $privileges = array($privileges);
$acl = $this->getCurrentUserPrivilegeSet($uri);
if (is_null($acl)) {
if ($this->allowAccessToNodesWithoutACL) {
return true;
} else {
if ($throwExceptions)
throw new Sabre_DAVACL_Exception_NeedPrivileges($uri,$privileges);
else
return false;
}
}
$failed = array();
foreach($privileges as $priv) {
if (!in_array($priv, $acl)) {
$failed[] = $priv;
}
}
if ($failed) {
if ($throwExceptions)
throw new Sabre_DAVACL_Exception_NeedPrivileges($uri,$failed);
else
return false;
}
return true;
}
/**
* Returns the standard users' principal.
*
* This is one authorative principal url for the current user.
* This method will return null if the user wasn't logged in.
*
* @return string|null
*/
public function getCurrentUserPrincipal() {
$authPlugin = $this->server->getPlugin('auth');
if (is_null($authPlugin)) return null;
/** @var $authPlugin Sabre_DAV_Auth_Plugin */
$userName = $authPlugin->getCurrentUser();
if (!$userName) return null;
return $this->defaultUsernamePath . '/' . $userName;
}
/**
* Returns a list of principals that's associated to the current
* user, either directly or through group membership.
*
* @return array
*/
public function getCurrentUserPrincipals() {
$currentUser = $this->getCurrentUserPrincipal();
if (is_null($currentUser)) return array();
$check = array($currentUser);
$principals = array($currentUser);
while(count($check)) {
$principal = array_shift($check);
$node = $this->server->tree->getNodeForPath($principal);
if ($node instanceof Sabre_DAVACL_IPrincipal) {
foreach($node->getGroupMembership() as $groupMember) {
if (!in_array($groupMember, $principals)) {
$check[] = $groupMember;
$principals[] = $groupMember;
}
}
}
}
return $principals;
}
/**
* Returns the supported privilege structure for this ACL plugin.
*
* See RFC3744 for more details. Currently we default on a simple,
* standard structure.
*
* You can either get the list of privileges by a uri (path) or by
* specifying a Node.
*
* @param string|Sabre_DAV_INode $node
* @return array
*/
public function getSupportedPrivilegeSet($node) {
if (is_string($node)) {
$node = $this->server->tree->getNodeForPath($node);
}
if ($node instanceof Sabre_DAVACL_IACL) {
$result = $node->getSupportedPrivilegeSet();
if ($result)
return $result;
}
return self::getDefaultSupportedPrivilegeSet();
}
/**
* Returns a fairly standard set of privileges, which may be useful for
* other systems to use as a basis.
*
* @return array
*/
static function getDefaultSupportedPrivilegeSet() {
return array(
'privilege' => '{DAV:}all',
'abstract' => true,
'aggregates' => array(
array(
'privilege' => '{DAV:}read',
'aggregates' => array(
array(
'privilege' => '{DAV:}read-acl',
'abstract' => true,
),
array(
'privilege' => '{DAV:}read-current-user-privilege-set',
'abstract' => true,
),
),
), // {DAV:}read
array(
'privilege' => '{DAV:}write',
'aggregates' => array(
array(
'privilege' => '{DAV:}write-acl',
'abstract' => true,
),
array(
'privilege' => '{DAV:}write-properties',
'abstract' => true,
),
array(
'privilege' => '{DAV:}write-content',
'abstract' => true,
),
array(
'privilege' => '{DAV:}bind',
'abstract' => true,
),
array(
'privilege' => '{DAV:}unbind',
'abstract' => true,
),
array(
'privilege' => '{DAV:}unlock',
'abstract' => true,
),
),
), // {DAV:}write
),
); // {DAV:}all
}
/**
* Returns the supported privilege set as a flat list
*
* This is much easier to parse.
*
* The returned list will be index by privilege name.
* The value is a struct containing the following properties:
* - aggregates
* - abstract
* - concrete
*
* @param string|Sabre_DAV_INode $node
* @return array
*/
final public function getFlatPrivilegeSet($node) {
$privs = $this->getSupportedPrivilegeSet($node);
$flat = array();
$this->getFPSTraverse($privs, null, $flat);
return $flat;
}
/**
* Traverses the privilege set tree for reordering
*
* This function is solely used by getFlatPrivilegeSet, and would have been
* a closure if it wasn't for the fact I need to support PHP 5.2.
*
* @param array $priv
* @param $concrete
* @param array $flat
* @return void
*/
final private function getFPSTraverse($priv, $concrete, &$flat) {
$myPriv = array(
'privilege' => $priv['privilege'],
'abstract' => isset($priv['abstract']) && $priv['abstract'],
'aggregates' => array(),
'concrete' => isset($priv['abstract']) && $priv['abstract']?$concrete:$priv['privilege'],
);
if (isset($priv['aggregates']))
foreach($priv['aggregates'] as $subPriv) $myPriv['aggregates'][] = $subPriv['privilege'];
$flat[$priv['privilege']] = $myPriv;
if (isset($priv['aggregates'])) {
foreach($priv['aggregates'] as $subPriv) {
$this->getFPSTraverse($subPriv, $myPriv['concrete'], $flat);
}
}
}
/**
* Returns the full ACL list.
*
* Either a uri or a Sabre_DAV_INode may be passed.
*
* null will be returned if the node doesn't support ACLs.
*
* @param string|Sabre_DAV_INode $node
* @return array
*/
public function getACL($node) {
if (is_string($node)) {
$node = $this->server->tree->getNodeForPath($node);
}
if (!$node instanceof Sabre_DAVACL_IACL) {
return null;
}
$acl = $node->getACL();
foreach($this->adminPrincipals as $adminPrincipal) {
$acl[] = array(
'principal' => $adminPrincipal,
'privilege' => '{DAV:}all',
'protected' => true,
);
}
return $acl;
}
/**
* Returns a list of privileges the current user has
* on a particular node.
*
* Either a uri or a Sabre_DAV_INode may be passed.
*
* null will be returned if the node doesn't support ACLs.
*
* @param string|Sabre_DAV_INode $node
* @return array
*/
public function getCurrentUserPrivilegeSet($node) {
if (is_string($node)) {
$node = $this->server->tree->getNodeForPath($node);
}
$acl = $this->getACL($node);
if (is_null($acl)) return null;
$principals = $this->getCurrentUserPrincipals();
$collected = array();
foreach($acl as $ace) {
$principal = $ace['principal'];
switch($principal) {
case '{DAV:}owner' :
$owner = $node->getOwner();
if ($owner && in_array($owner, $principals)) {
$collected[] = $ace;
}
break;
// 'all' matches for every user
case '{DAV:}all' :
// 'authenticated' matched for every user that's logged in.
// Since it's not possible to use ACL while not being logged
// in, this is also always true.
case '{DAV:}authenticated' :
$collected[] = $ace;
break;
// 'unauthenticated' can never occur either, so we simply
// ignore these.
case '{DAV:}unauthenticated' :
break;
default :
if (in_array($ace['principal'], $principals)) {
$collected[] = $ace;
}
break;
}
}
// Now we deduct all aggregated privileges.
$flat = $this->getFlatPrivilegeSet($node);
$collected2 = array();
while(count($collected)) {
$current = array_pop($collected);
$collected2[] = $current['privilege'];
foreach($flat[$current['privilege']]['aggregates'] as $subPriv) {
$collected2[] = $subPriv;
$collected[] = $flat[$subPriv];
}
}
return array_values(array_unique($collected2));
}
/**
* Principal property search
*
* This method can search for principals matching certain values in
* properties.
*
* This method will return a list of properties for the matched properties.
*
* @param array $searchProperties The properties to search on. This is a
* key-value list. The keys are property
* names, and the values the strings to
* match them on.
* @param array $requestedProperties This is the list of properties to
* return for every match.
* @param string $collectionUri The principal collection to search on.
* If this is ommitted, the standard
* principal collection-set will be used.
* @return array This method returns an array structure similar to
* Sabre_DAV_Server::getPropertiesForPath. Returned
* properties are index by a HTTP status code.
*
*/
public function principalSearch(array $searchProperties, array $requestedProperties, $collectionUri = null) {
if (!is_null($collectionUri)) {
$uris = array($collectionUri);
} else {
$uris = $this->principalCollectionSet;
}
$lookupResults = array();
foreach($uris as $uri) {
$principalCollection = $this->server->tree->getNodeForPath($uri);
if (!$principalCollection instanceof Sabre_DAVACL_AbstractPrincipalCollection) {
// Not a principal collection, we're simply going to ignore
// this.
continue;
}
$results = $principalCollection->searchPrincipals($searchProperties);
foreach($results as $result) {
$lookupResults[] = rtrim($uri,'/') . '/' . $result;
}
}
$matches = array();
foreach($lookupResults as $lookupResult) {
list($matches[]) = $this->server->getPropertiesForPath($lookupResult, $requestedProperties, 0);
}
return $matches;
}
/**
* Sets up the plugin
*
* This method is automatically called by the server class.
*
* @param Sabre_DAV_Server $server
* @return void
*/
public function initialize(Sabre_DAV_Server $server) {
$this->server = $server;
$server->subscribeEvent('beforeGetProperties',array($this,'beforeGetProperties'));
$server->subscribeEvent('beforeMethod', array($this,'beforeMethod'),20);
$server->subscribeEvent('beforeBind', array($this,'beforeBind'),20);
$server->subscribeEvent('beforeUnbind', array($this,'beforeUnbind'),20);
$server->subscribeEvent('updateProperties',array($this,'updateProperties'));
$server->subscribeEvent('beforeUnlock', array($this,'beforeUnlock'),20);
$server->subscribeEvent('report',array($this,'report'));
$server->subscribeEvent('unknownMethod', array($this, 'unknownMethod'));
array_push($server->protectedProperties,
'{DAV:}alternate-URI-set',
'{DAV:}principal-URL',
'{DAV:}group-membership',
'{DAV:}principal-collection-set',
'{DAV:}current-user-principal',
'{DAV:}supported-privilege-set',
'{DAV:}current-user-privilege-set',
'{DAV:}acl',
'{DAV:}acl-restrictions',
'{DAV:}inherited-acl-set',
'{DAV:}owner',
'{DAV:}group'
);
// Automatically mapping nodes implementing IPrincipal to the
// {DAV:}principal resourcetype.
$server->resourceTypeMapping['Sabre_DAVACL_IPrincipal'] = '{DAV:}principal';
// Mapping the group-member-set property to the HrefList property
// class.
$server->propertyMap['{DAV:}group-member-set'] = 'Sabre_DAV_Property_HrefList';
}
/* {{{ Event handlers */
/**
* Triggered before any method is handled
*
* @param string $method
* @param string $uri
* @return void
*/
public function beforeMethod($method, $uri) {
$exists = $this->server->tree->nodeExists($uri);
// If the node doesn't exists, none of these checks apply
if (!$exists) return;
switch($method) {
case 'GET' :
case 'HEAD' :
case 'OPTIONS' :
// For these 3 we only need to know if the node is readable.
$this->checkPrivileges($uri,'{DAV:}read');
break;
case 'PUT' :
case 'LOCK' :
case 'UNLOCK' :
// This method requires the write-content priv if the node
// already exists, and bind on the parent if the node is being
// created.
// The bind privilege is handled in the beforeBind event.
$this->checkPrivileges($uri,'{DAV:}write-content');
break;
case 'PROPPATCH' :
$this->checkPrivileges($uri,'{DAV:}write-properties');
break;
case 'ACL' :
$this->checkPrivileges($uri,'{DAV:}write-acl');
break;
case 'COPY' :
case 'MOVE' :
// Copy requires read privileges on the entire source tree.
// If the target exists write-content normally needs to be
// checked, however, we're deleting the node beforehand and
// creating a new one after, so this is handled by the
// beforeUnbind event.
//
// The creation of the new node is handled by the beforeBind
// event.
//
// If MOVE is used beforeUnbind will also be used to check if
// the sourcenode can be deleted.
$this->checkPrivileges($uri,'{DAV:}read',self::R_RECURSIVE);
break;
}
}
/**
* Triggered before a new node is created.
*
* This allows us to check permissions for any operation that creates a
* new node, such as PUT, MKCOL, MKCALENDAR, LOCK, COPY and MOVE.
*
* @param string $uri
* @return void
*/
public function beforeBind($uri) {
list($parentUri,$nodeName) = Sabre_DAV_URLUtil::splitPath($uri);
$this->checkPrivileges($parentUri,'{DAV:}bind');
}
/**
* Triggered before a node is deleted
*
* This allows us to check permissions for any operation that will delete
* an existing node.
*
* @param string $uri
* @return void
*/
public function beforeUnbind($uri) {
list($parentUri,$nodeName) = Sabre_DAV_URLUtil::splitPath($uri);
$this->checkPrivileges($parentUri,'{DAV:}unbind',self::R_RECURSIVEPARENTS);
}
/**
* Triggered before a node is unlocked.
*
* @param string $uri
* @param Sabre_DAV_Locks_LockInfo $lock
* @TODO: not yet implemented
* @return void
*/
public function beforeUnlock($uri, Sabre_DAV_Locks_LockInfo $lock) {
}
/**
* Triggered before properties are looked up in specific nodes.
*
* @param string $uri
* @param Sabre_DAV_INode $node
* @param array $requestedProperties
* @param array $returnedProperties
* @TODO really should be broken into multiple methods, or even a class.
* @return bool
*/
public function beforeGetProperties($uri, Sabre_DAV_INode $node, &$requestedProperties, &$returnedProperties) {
// Checking the read permission
if (!$this->checkPrivileges($uri,'{DAV:}read',self::R_PARENT,false)) {
// User is not allowed to read properties
if ($this->hideNodesFromListings) {
return false;
}
// Marking all requested properties as '403'.
foreach($requestedProperties as $key=>$requestedProperty) {
unset($requestedProperties[$key]);
$returnedProperties[403][$requestedProperty] = null;
}
return;
}
/* Adding principal properties */
if ($node instanceof Sabre_DAVACL_IPrincipal) {
if (false !== ($index = array_search('{DAV:}alternate-URI-set', $requestedProperties))) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}alternate-URI-set'] = new Sabre_DAV_Property_HrefList($node->getAlternateUriSet());
}
if (false !== ($index = array_search('{DAV:}principal-URL', $requestedProperties))) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}principal-URL'] = new Sabre_DAV_Property_Href($node->getPrincipalUrl() . '/');
}
if (false !== ($index = array_search('{DAV:}group-member-set', $requestedProperties))) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}group-member-set'] = new Sabre_DAV_Property_HrefList($node->getGroupMemberSet());
}
if (false !== ($index = array_search('{DAV:}group-membership', $requestedProperties))) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}group-membership'] = new Sabre_DAV_Property_HrefList($node->getGroupMembership());
}
if (false !== ($index = array_search('{DAV:}displayname', $requestedProperties))) {
$returnedProperties[200]['{DAV:}displayname'] = $node->getDisplayName();
}
}
if (false !== ($index = array_search('{DAV:}principal-collection-set', $requestedProperties))) {
unset($requestedProperties[$index]);
$val = $this->principalCollectionSet;
// Ensuring all collections end with a slash
foreach($val as $k=>$v) $val[$k] = $v . '/';
$returnedProperties[200]['{DAV:}principal-collection-set'] = new Sabre_DAV_Property_HrefList($val);
}
if (false !== ($index = array_search('{DAV:}current-user-principal', $requestedProperties))) {
unset($requestedProperties[$index]);
if ($url = $this->getCurrentUserPrincipal()) {
$returnedProperties[200]['{DAV:}current-user-principal'] = new Sabre_DAVACL_Property_Principal(Sabre_DAVACL_Property_Principal::HREF, $url . '/');
} else {
$returnedProperties[200]['{DAV:}current-user-principal'] = new Sabre_DAVACL_Property_Principal(Sabre_DAVACL_Property_Principal::UNAUTHENTICATED);
}
}
if (false !== ($index = array_search('{DAV:}supported-privilege-set', $requestedProperties))) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}supported-privilege-set'] = new Sabre_DAVACL_Property_SupportedPrivilegeSet($this->getSupportedPrivilegeSet($node));
}
if (false !== ($index = array_search('{DAV:}current-user-privilege-set', $requestedProperties))) {
if (!$this->checkPrivileges($uri, '{DAV:}read-current-user-privilege-set', self::R_PARENT, false)) {
$returnedProperties[403]['{DAV:}current-user-privilege-set'] = null;
unset($requestedProperties[$index]);
} else {
$val = $this->getCurrentUserPrivilegeSet($node);
if (!is_null($val)) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}current-user-privilege-set'] = new Sabre_DAVACL_Property_CurrentUserPrivilegeSet($val);
}
}
}
/* The ACL property contains all the permissions */
if (false !== ($index = array_search('{DAV:}acl', $requestedProperties))) {
if (!$this->checkPrivileges($uri, '{DAV:}read-acl', self::R_PARENT, false)) {
unset($requestedProperties[$index]);
$returnedProperties[403]['{DAV:}acl'] = null;
} else {
$acl = $this->getACL($node);
if (!is_null($acl)) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}acl'] = new Sabre_DAVACL_Property_Acl($this->getACL($node));
}
}
}
/* The acl-restrictions property contains information on how privileges
* must behave.
*/
if (false !== ($index = array_search('{DAV:}acl-restrictions', $requestedProperties))) {
unset($requestedProperties[$index]);
$returnedProperties[200]['{DAV:}acl-restrictions'] = new Sabre_DAVACL_Property_AclRestrictions();
}
}
/**
* This method intercepts PROPPATCH methods and make sure the
* group-member-set is updated correctly.
*
* @param array $propertyDelta
* @param array $result
* @param Sabre_DAV_INode $node
* @return bool
*/
public function updateProperties(&$propertyDelta, &$result, Sabre_DAV_INode $node) {
if (!array_key_exists('{DAV:}group-member-set', $propertyDelta))
return;
if (is_null($propertyDelta['{DAV:}group-member-set'])) {
$memberSet = array();
} elseif ($propertyDelta['{DAV:}group-member-set'] instanceof Sabre_DAV_Property_HrefList) {
$memberSet = $propertyDelta['{DAV:}group-member-set']->getHrefs();
} else {
throw new Sabre_DAV_Exception('The group-member-set property MUST be an instance of Sabre_DAV_Property_HrefList or null');
}
if (!($node instanceof Sabre_DAVACL_IPrincipal)) {
$result[403]['{DAV:}group-member-set'] = null;
unset($propertyDelta['{DAV:}group-member-set']);
// Returning false will stop the updateProperties process
return false;
}
$node->setGroupMemberSet($memberSet);
$result[200]['{DAV:}group-member-set'] = null;
unset($propertyDelta['{DAV:}group-member-set']);
}
/**
* This method handles HTTP REPORT requests
*
* @param string $reportName
* @param DOMNode $dom
* @return bool
*/
public function report($reportName, $dom) {
switch($reportName) {
case '{DAV:}principal-property-search' :
$this->principalPropertySearchReport($dom);
return false;
case '{DAV:}principal-search-property-set' :
$this->principalSearchPropertySetReport($dom);
return false;
case '{DAV:}expand-property' :
$this->expandPropertyReport($dom);
return false;
}
}
/**
* This event is triggered for any HTTP method that is not known by the
* webserver.
*
* @param string $method
* @param string $uri
* @return bool
*/
public function unknownMethod($method, $uri) {
if ($method!=='ACL') return;
$this->httpACL($uri);
return false;
}
/**
* This method is responsible for handling the 'ACL' event.
*
* @param string $uri
* @return void
*/
public function httpACL($uri) {
$body = $this->server->httpRequest->getBody(true);
$dom = Sabre_DAV_XMLUtil::loadDOMDocument($body);
$newAcl =
Sabre_DAVACL_Property_Acl::unserialize($dom->firstChild)
->getPrivileges();
// Normalizing urls
foreach($newAcl as $k=>$newAce) {
$newAcl[$k]['principal'] = $this->server->calculateUri($newAce['principal']);
}
$node = $this->server->tree->getNodeForPath($uri);
if (!($node instanceof Sabre_DAVACL_IACL)) {
throw new Sabre_DAV_Exception_MethodNotAllowed('This node does not support the ACL method');
}
$oldAcl = $this->getACL($node);
$supportedPrivileges = $this->getFlatPrivilegeSet($node);
/* Checking if protected principals from the existing principal set are
not overwritten. */
foreach($oldAcl as $oldAce) {
if (!isset($oldAce['protected']) || !$oldAce['protected']) continue;
$found = false;
foreach($newAcl as $newAce) {
if (
$newAce['privilege'] === $oldAce['privilege'] &&
$newAce['principal'] === $oldAce['principal'] &&
$newAce['protected']
)
$found = true;
}
if (!$found)
throw new Sabre_DAVACL_Exception_AceConflict('This resource contained a protected {DAV:}ace, but this privilege did not occur in the ACL request');
}
foreach($newAcl as $newAce) {
// Do we recognize the privilege
if (!isset($supportedPrivileges[$newAce['privilege']])) {
throw new Sabre_DAVACL_Exception_NotSupportedPrivilege('The privilege you specified (' . $newAce['privilege'] . ') is not recognized by this server');
}
if ($supportedPrivileges[$newAce['privilege']]['abstract']) {
throw new Sabre_DAVACL_Exception_NoAbstract('The privilege you specified (' . $newAce['privilege'] . ') is an abstract privilege');
}
// Looking up the principal
try {
$principal = $this->server->tree->getNodeForPath($newAce['principal']);
} catch (Sabre_DAV_Exception_NotFound $e) {
throw new Sabre_DAVACL_Exception_NotRecognizedPrincipal('The specified principal (' . $newAce['principal'] . ') does not exist');
}
if (!($principal instanceof Sabre_DAVACL_IPrincipal)) {
throw new Sabre_DAVACL_Exception_NotRecognizedPrincipal('The specified uri (' . $newAce['principal'] . ') is not a principal');
}
}
$node->setACL($newAcl);
}
/* }}} */
/* Reports {{{ */
/**
* The expand-property report is defined in RFC3253 section 3-8.
*
* This report is very similar to a standard PROPFIND. The difference is
* that it has the additional ability to look at properties containing a
* {DAV:}href element, follow that property and grab additional elements
* there.
*
* Other rfc's, such as ACL rely on this report, so it made sense to put
* it in this plugin.
*
* @param DOMElement $dom
* @return void
*/
protected function expandPropertyReport($dom) {
$requestedProperties = $this->parseExpandPropertyReportRequest($dom->firstChild->firstChild);
$depth = $this->server->getHTTPDepth(0);
$requestUri = $this->server->getRequestUri();
$result = $this->expandProperties($requestUri,$requestedProperties,$depth);
$dom = new DOMDocument('1.0','utf-8');
$dom->formatOutput = true;
$multiStatus = $dom->createElement('d:multistatus');
$dom->appendChild($multiStatus);
// Adding in default namespaces
foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
$multiStatus->setAttribute('xmlns:' . $prefix,$namespace);
}
foreach($result as $response) {
$response->serialize($this->server, $multiStatus);
}
$xml = $dom->saveXML();
$this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
$this->server->httpResponse->sendStatus(207);
$this->server->httpResponse->sendBody($xml);
}
/**
* This method is used by expandPropertyReport to parse
* out the entire HTTP request.
*
* @param DOMElement $node
* @return array
*/
protected function parseExpandPropertyReportRequest($node) {
$requestedProperties = array();
do {
if (Sabre_DAV_XMLUtil::toClarkNotation($node)!=='{DAV:}property') continue;
if ($node->firstChild) {
$children = $this->parseExpandPropertyReportRequest($node->firstChild);
} else {
$children = array();
}
$namespace = $node->getAttribute('namespace');
if (!$namespace) $namespace = 'DAV:';
$propName = '{'.$namespace.'}' . $node->getAttribute('name');
$requestedProperties[$propName] = $children;
} while ($node = $node->nextSibling);
return $requestedProperties;
}
/**
* This method expands all the properties and returns
* a list with property values
*
* @param array $path
* @param array $requestedProperties the list of required properties
* @param int $depth
* @return array
*/
protected function expandProperties($path, array $requestedProperties, $depth) {
$foundProperties = $this->server->getPropertiesForPath($path, array_keys($requestedProperties), $depth);
$result = array();
foreach($foundProperties as $node) {
foreach($requestedProperties as $propertyName=>$childRequestedProperties) {
// We're only traversing if sub-properties were requested
if(count($childRequestedProperties)===0) continue;
// We only have to do the expansion if the property was found
// and it contains an href element.
if (!array_key_exists($propertyName,$node[200])) continue;
if ($node[200][$propertyName] instanceof Sabre_DAV_Property_IHref) {
$hrefs = array($node[200][$propertyName]->getHref());
} elseif ($node[200][$propertyName] instanceof Sabre_DAV_Property_HrefList) {
$hrefs = $node[200][$propertyName]->getHrefs();
}
$childProps = array();
foreach($hrefs as $href) {
$childProps = array_merge($childProps, $this->expandProperties($href, $childRequestedProperties, 0));
}
$node[200][$propertyName] = new Sabre_DAV_Property_ResponseList($childProps);
}
$result[] = new Sabre_DAV_Property_Response($path, $node);
}
return $result;
}
/**
* principalSearchPropertySetReport
*
* This method responsible for handing the
* {DAV:}principal-search-property-set report. This report returns a list
* of properties the client may search on, using the
* {DAV:}principal-property-search report.
*
* @param DOMDocument $dom
* @return void
*/
protected function principalSearchPropertySetReport(DOMDocument $dom) {
$httpDepth = $this->server->getHTTPDepth(0);
if ($httpDepth!==0) {
throw new Sabre_DAV_Exception_BadRequest('This report is only defined when Depth: 0');
}
if ($dom->firstChild->hasChildNodes())
throw new Sabre_DAV_Exception_BadRequest('The principal-search-property-set report element is not allowed to have child elements');
$dom = new DOMDocument('1.0','utf-8');
$dom->formatOutput = true;
$root = $dom->createElement('d:principal-search-property-set');
$dom->appendChild($root);
// Adding in default namespaces
foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
$root->setAttribute('xmlns:' . $prefix,$namespace);
}
$nsList = $this->server->xmlNamespaces;
foreach($this->principalSearchPropertySet as $propertyName=>$description) {
$psp = $dom->createElement('d:principal-search-property');
$root->appendChild($psp);
$prop = $dom->createElement('d:prop');
$psp->appendChild($prop);
$propName = null;
preg_match('/^{([^}]*)}(.*)$/',$propertyName,$propName);
$currentProperty = $dom->createElement($nsList[$propName[1]] . ':' . $propName[2]);
$prop->appendChild($currentProperty);
$descriptionElem = $dom->createElement('d:description');
$descriptionElem->setAttribute('xml:lang','en');
$descriptionElem->appendChild($dom->createTextNode($description));
$psp->appendChild($descriptionElem);
}
$this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
$this->server->httpResponse->sendStatus(200);
$this->server->httpResponse->sendBody($dom->saveXML());
}
/**
* principalPropertySearchReport
*
* This method is responsible for handing the
* {DAV:}principal-property-search report. This report can be used for
* clients to search for groups of principals, based on the value of one
* or more properties.
*
* @param DOMDocument $dom
* @return void
*/
protected function principalPropertySearchReport(DOMDocument $dom) {
list($searchProperties, $requestedProperties, $applyToPrincipalCollectionSet) = $this->parsePrincipalPropertySearchReportRequest($dom);
$uri = null;
if (!$applyToPrincipalCollectionSet) {
$uri = $this->server->getRequestUri();
}
$result = $this->principalSearch($searchProperties, $requestedProperties, $uri);
$xml = $this->server->generateMultiStatus($result);
$this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
$this->server->httpResponse->sendStatus(207);
$this->server->httpResponse->sendBody($xml);
}
/**
* parsePrincipalPropertySearchReportRequest
*
* This method parses the request body from a
* {DAV:}principal-property-search report.
*
* This method returns an array with two elements:
* 1. an array with properties to search on, and their values
* 2. a list of propertyvalues that should be returned for the request.
*
* @param DOMDocument $dom
* @return array
*/
protected function parsePrincipalPropertySearchReportRequest($dom) {
$httpDepth = $this->server->getHTTPDepth(0);
if ($httpDepth!==0) {
throw new Sabre_DAV_Exception_BadRequest('This report is only defined when Depth: 0');
}
$searchProperties = array();
$applyToPrincipalCollectionSet = false;
// Parsing the search request
foreach($dom->firstChild->childNodes as $searchNode) {
if (Sabre_DAV_XMLUtil::toClarkNotation($searchNode) == '{DAV:}apply-to-principal-collection-set') {
$applyToPrincipalCollectionSet = true;
}
if (Sabre_DAV_XMLUtil::toClarkNotation($searchNode)!=='{DAV:}property-search')
continue;
$propertyName = null;
$propertyValue = null;
foreach($searchNode->childNodes as $childNode) {
switch(Sabre_DAV_XMLUtil::toClarkNotation($childNode)) {
case '{DAV:}prop' :
$property = Sabre_DAV_XMLUtil::parseProperties($searchNode);
reset($property);
$propertyName = key($property);
break;
case '{DAV:}match' :
$propertyValue = $childNode->textContent;
break;
}
}
if (is_null($propertyName) || is_null($propertyValue))
throw new Sabre_DAV_Exception_BadRequest('Invalid search request. propertyname: ' . $propertyName . '. propertvvalue: ' . $propertyValue);
$searchProperties[$propertyName] = $propertyValue;
}
return array($searchProperties, array_keys(Sabre_DAV_XMLUtil::parseProperties($dom->firstChild)), $applyToPrincipalCollectionSet);
}
/* }}} */
}
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