mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
759 lines
23 KiB
PHP
759 lines
23 KiB
PHP
<?php
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namespace SilverStripe\Security;
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use InvalidArgumentException;
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use SilverStripe\Core\Injector\Injectable;
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use SilverStripe\ORM\DataList;
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use SilverStripe\ORM\DataObject;
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use SilverStripe\ORM\Hierarchy\Hierarchy;
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use SilverStripe\Versioned\Versioned;
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use Psr\SimpleCache\CacheInterface;
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use SilverStripe\Core\Cache\MemberCacheFlusher;
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/**
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* Calculates batch permissions for nested objects for:
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* - canView: Supports 'Anyone' type
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* - canEdit
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* - canDelete: Includes special logic for ensuring parent objects can only be deleted if their children can
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* be deleted also.
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*/
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class InheritedPermissions implements PermissionChecker, MemberCacheFlusher
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{
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use Injectable;
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/**
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* Delete permission
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*/
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const DELETE = 'delete';
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/**
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* View permission
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*/
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const VIEW = 'view';
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/**
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* Edit permission
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*/
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const EDIT = 'edit';
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/**
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* Anyone canView permission
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*/
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const ANYONE = 'Anyone';
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/**
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* Restrict to logged in users
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*/
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const LOGGED_IN_USERS = 'LoggedInUsers';
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/**
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* Restrict to specific groups
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*/
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const ONLY_THESE_USERS = 'OnlyTheseUsers';
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/**
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* Inherit from parent
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*/
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const INHERIT = 'Inherit';
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/**
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* Class name
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*
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* @var string
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*/
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protected $baseClass = null;
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/**
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* Object for evaluating top level permissions designed as "Inherit"
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*
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* @var DefaultPermissionChecker
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*/
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protected $defaultPermissions = null;
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/**
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* Global permissions required to edit.
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* If empty no global permissions are required
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*
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* @var array
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*/
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protected $globalEditPermissions = [];
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/**
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* Cache of permissions
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*
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* @var array
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*/
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protected $cachePermissions = [];
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/**
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* @var CacheInterface
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*/
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protected $cacheService;
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/**
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* Construct new permissions object
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*
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* @param string $baseClass Base class
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* @param CacheInterface $cache
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*/
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public function __construct($baseClass, CacheInterface $cache = null)
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{
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if (!is_a($baseClass, DataObject::class, true)) {
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throw new InvalidArgumentException('Invalid DataObject class: ' . $baseClass);
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}
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$this->baseClass = $baseClass;
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$this->cacheService = $cache;
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return $this;
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}
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/**
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* Commits the cache
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*/
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public function __destruct()
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{
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// Ensure back-end cache is updated
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if (!empty($this->cachePermissions) && $this->cacheService) {
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foreach ($this->cachePermissions as $key => $permissions) {
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$this->cacheService->set($key, $permissions);
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}
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// Prevent double-destruct
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$this->cachePermissions = [];
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}
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}
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/**
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* Clear the cache for this instance only
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*
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* @param array $memberIDs A list of member IDs
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*/
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public function flushMemberCache($memberIDs = null)
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{
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if (!$this->cacheService) {
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return;
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}
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// Hard flush, e.g. flush=1
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if (!$memberIDs) {
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$this->cacheService->clear();
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}
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if ($memberIDs && is_array($memberIDs)) {
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foreach ([self::VIEW, self::EDIT, self::DELETE] as $type) {
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foreach ($memberIDs as $memberID) {
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$key = $this->generateCacheKey($type, $memberID);
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$this->cacheService->delete($key);
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}
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}
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}
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}
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/**
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* @param DefaultPermissionChecker $callback
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* @return $this
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*/
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public function setDefaultPermissions(DefaultPermissionChecker $callback)
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{
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$this->defaultPermissions = $callback;
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return $this;
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}
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/**
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* Global permissions required to edit
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*
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* @param array $permissions
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* @return $this
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*/
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public function setGlobalEditPermissions($permissions)
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{
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$this->globalEditPermissions = $permissions;
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return $this;
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}
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/**
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* @return array
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*/
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public function getGlobalEditPermissions()
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{
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return $this->globalEditPermissions;
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}
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/**
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* Get root permissions handler, or null if no handler
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*
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* @return DefaultPermissionChecker|null
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*/
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public function getDefaultPermissions()
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{
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return $this->defaultPermissions;
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}
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/**
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* Get base class
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*
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* @return string
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*/
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public function getBaseClass()
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{
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return $this->baseClass;
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}
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/**
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* Force pre-calculation of a list of permissions for optimisation
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*
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* @param string $permission
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* @param array $ids
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*/
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public function prePopulatePermissionCache($permission = 'edit', $ids = [])
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{
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switch ($permission) {
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case self::EDIT:
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$this->canEditMultiple($ids, Security::getCurrentUser(), false);
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break;
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case self::VIEW:
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$this->canViewMultiple($ids, Security::getCurrentUser(), false);
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break;
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case self::DELETE:
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$this->canDeleteMultiple($ids, Security::getCurrentUser(), false);
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break;
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default:
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throw new InvalidArgumentException("Invalid permission type $permission");
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}
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}
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/**
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* This method is NOT a full replacement for the individual can*() methods, e.g. {@link canEdit()}. Rather than
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* checking (potentially slow) PHP logic, it relies on the database group associations, e.g. the "CanEditType" field
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* plus the "SiteTree_EditorGroups" many-many table. By batch checking multiple records, we can combine the queries
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* efficiently.
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*
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* Caches based on $typeField data. To invalidate the cache, use {@link SiteTree::reset()} or set the $useCached
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* property to FALSE.
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*
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* @param string $type Either edit, view, or create
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* @param array $ids Array of IDs
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* @param Member $member Member
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* @param array $globalPermission If the member doesn't have this permission code, don't bother iterating deeper
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* @param bool $useCached Enables use of cache. Cache will be populated even if this is false.
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* @return array A map of permissions, keys are ID numbers, and values are boolean permission checks
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* ID keys to boolean values
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*/
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protected function batchPermissionCheck(
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$type,
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$ids,
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Member $member = null,
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$globalPermission = [],
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$useCached = true
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) {
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// Validate ids
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$ids = array_filter($ids, 'is_numeric');
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if (empty($ids)) {
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return [];
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}
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// Default result: nothing editable
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$result = array_fill_keys($ids, false);
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// Validate member permission
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// Only VIEW allows anonymous (Anyone) permissions
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$memberID = $member ? (int)$member->ID : 0;
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if (!$memberID && $type !== self::VIEW) {
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return $result;
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}
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// Look in the cache for values
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$cacheKey = $this->generateCacheKey($type, $memberID);
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$cachePermissions = $this->getCachePermissions($cacheKey);
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if ($useCached && $cachePermissions) {
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$cachedValues = array_intersect_key($cachePermissions, $result);
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// If we can't find everything in the cache, then look up the remainder separately
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$uncachedIDs = array_keys(array_diff_key($result, $cachePermissions));
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if ($uncachedIDs) {
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$uncachedValues = $this->batchPermissionCheck($type, $uncachedIDs, $member, $globalPermission, false);
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return $cachedValues + $uncachedValues;
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}
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return $cachedValues;
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}
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// If a member doesn't have a certain permission then they can't edit anything
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if ($globalPermission && !Permission::checkMember($member, $globalPermission)) {
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return $result;
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}
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// Get the groups that the given member belongs to
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$groupIDsSQLList = '0';
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if ($memberID) {
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$groupIDs = $member->Groups()->column("ID");
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$groupIDsSQLList = implode(", ", $groupIDs) ?: '0';
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}
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// Check if record is versioned
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if ($this->isVersioned()) {
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// Check all records for each stage and merge
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$combinedStageResult = [];
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foreach ([Versioned::DRAFT, Versioned::LIVE] as $stage) {
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$stageRecords = Versioned::get_by_stage($this->getBaseClass(), $stage)
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->byIDs($ids);
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// Exclude previously calculated records from later stage calculations
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if ($combinedStageResult) {
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$stageRecords = $stageRecords->exclude('ID', array_keys($combinedStageResult));
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}
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$stageResult = $this->batchPermissionCheckForStage(
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$type,
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$globalPermission,
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$stageRecords,
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$groupIDsSQLList,
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$member
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);
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// Note: Draft stage takes precedence over live, but only if draft exists
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$combinedStageResult = $combinedStageResult + $stageResult;
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}
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} else {
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// Unstaged result
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$stageRecords = DataObject::get($this->getBaseClass())->byIDs($ids);
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$combinedStageResult = $this->batchPermissionCheckForStage(
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$type,
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$globalPermission,
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$stageRecords,
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$groupIDsSQLList,
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$member
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);
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}
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// Cache the results
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if (empty($this->cachePermissions[$cacheKey])) {
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$this->cachePermissions[$cacheKey] = [];
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}
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if ($combinedStageResult) {
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$this->cachePermissions[$cacheKey] = $combinedStageResult + $this->cachePermissions[$cacheKey];
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}
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return $combinedStageResult;
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}
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/**
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* @param string $type
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* @param array $globalPermission List of global permissions
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* @param DataList $stageRecords List of records to check for this stage
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* @param string $groupIDsSQLList Group IDs this member belongs to
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* @param Member $member
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* @return array
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*/
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protected function batchPermissionCheckForStage(
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$type,
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$globalPermission,
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DataList $stageRecords,
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$groupIDsSQLList,
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Member $member = null
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) {
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// Initialise all IDs to false
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$result = array_fill_keys($stageRecords->column('ID'), false);
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// Get the uninherited permissions
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$typeField = $this->getPermissionField($type);
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$baseTable = DataObject::getSchema()->baseDataTable($this->getBaseClass());
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if ($member && $member->ID) {
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if (!Permission::checkMember($member, 'ADMIN')) {
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// Determine if this member matches any of the group or other rules
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$groupJoinTable = $this->getJoinTable($type);
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$uninheritedPermissions = $stageRecords
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->where([
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"(\"$typeField\" IN (?, ?) OR " . "(\"$typeField\" = ? AND \"$groupJoinTable\".\"{$baseTable}ID\" IS NOT NULL))"
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=> [
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self::ANYONE,
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self::LOGGED_IN_USERS,
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self::ONLY_THESE_USERS
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]
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])
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->leftJoin(
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$groupJoinTable,
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"\"$groupJoinTable\".\"{$baseTable}ID\" = \"{$baseTable}\".\"ID\" AND " . "\"$groupJoinTable\".\"GroupID\" IN ($groupIDsSQLList)"
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)->column('ID');
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} else {
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$uninheritedPermissions = $stageRecords->column('ID');
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}
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} else {
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// Only view pages with ViewType = Anyone if not logged in
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$uninheritedPermissions = $stageRecords
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->filter($typeField, self::ANYONE)
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->column('ID');
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}
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if ($uninheritedPermissions) {
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// Set all the relevant items in $result to true
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$result = array_fill_keys($uninheritedPermissions, true) + $result;
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}
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// This looks for any of our subjects who has their permission set to "inherited" in the CMS.
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// We group these and run a batch permission check on all parents. This gives us the result
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// of whether the user has permission to edit this object.
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$groupedByParent = [];
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$potentiallyInherited = $stageRecords->filter($typeField, self::INHERIT)
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->sort("\"{$baseTable}\".\"ID\"")
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->dataQuery()
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->query()
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->setSelect([
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"\"{$baseTable}\".\"ID\"",
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"\"{$baseTable}\".\"ParentID\""
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])
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->execute();
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foreach ($potentiallyInherited as $item) {
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/** @var DataObject|Hierarchy $item */
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if ($item['ParentID']) {
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if (!isset($groupedByParent[$item['ParentID']])) {
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$groupedByParent[$item['ParentID']] = [];
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}
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$groupedByParent[$item['ParentID']][] = $item['ID'];
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} else {
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// Fail over to default permission check for Inherit and ParentID = 0
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$result[$item['ID']] = $this->checkDefaultPermissions($type, $member);
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}
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}
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// Copy permissions from parent to child
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if (!empty($groupedByParent)) {
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$actuallyInherited = $this->batchPermissionCheck(
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$type,
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array_keys($groupedByParent),
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$member,
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$globalPermission
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);
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if ($actuallyInherited) {
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$parentIDs = array_keys(array_filter($actuallyInherited));
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foreach ($parentIDs as $parentID) {
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// Set all the relevant items in $result to true
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$result = array_fill_keys($groupedByParent[$parentID], true) + $result;
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}
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}
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}
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return $result;
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}
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/**
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* @param array $ids
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* @param Member|null $member
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* @param bool $useCached
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* @return array
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*/
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public function canEditMultiple($ids, Member $member = null, $useCached = true)
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{
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return $this->batchPermissionCheck(
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self::EDIT,
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$ids,
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$member,
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$this->getGlobalEditPermissions(),
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$useCached
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);
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}
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/**
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* @param array $ids
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* @param Member|null $member
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* @param bool $useCached
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* @return array
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*/
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public function canViewMultiple($ids, Member $member = null, $useCached = true)
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{
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return $this->batchPermissionCheck(self::VIEW, $ids, $member, [], $useCached);
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}
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/**
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* @param array $ids
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* @param Member|null $member
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* @param bool $useCached
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* @return array
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*/
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public function canDeleteMultiple($ids, Member $member = null, $useCached = true)
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{
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// Validate ids
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$ids = array_filter($ids, 'is_numeric');
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if (empty($ids)) {
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return [];
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}
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$result = array_fill_keys($ids, false);
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// Validate member permission
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if (!$member || !$member->ID) {
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return $result;
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}
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$deletable = [];
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// Look in the cache for values
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$cacheKey = "delete-{$member->ID}";
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$cachePermissions = $this->getCachePermissions($cacheKey);
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if ($useCached && $cachePermissions) {
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$cachedValues = array_intersect_key($cachePermissions[$cacheKey], $result);
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// If we can't find everything in the cache, then look up the remainder separately
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$uncachedIDs = array_keys(array_diff_key($result, $cachePermissions[$cacheKey]));
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if ($uncachedIDs) {
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$uncachedValues = $this->canDeleteMultiple($uncachedIDs, $member, false);
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return $cachedValues + $uncachedValues;
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}
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return $cachedValues;
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}
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// You can only delete pages that you can edit
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$editableIDs = array_keys(array_filter($this->canEditMultiple($ids, $member)));
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if ($editableIDs) {
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// You can only delete pages whose children you can delete
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$childRecords = DataObject::get($this->baseClass)
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->filter('ParentID', $editableIDs);
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// Find out the children that can be deleted
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$children = $childRecords->map("ID", "ParentID");
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$childIDs = $children->keys();
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if ($childIDs) {
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$deletableChildren = $this->canDeleteMultiple($childIDs, $member);
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// Get a list of all the parents that have no undeletable children
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$deletableParents = array_fill_keys($editableIDs, true);
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foreach ($deletableChildren as $id => $canDelete) {
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if (!$canDelete) {
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unset($deletableParents[$children[$id]]);
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}
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}
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// Use that to filter the list of deletable parents that have children
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$deletableParents = array_keys($deletableParents);
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// Also get the $ids that don't have children
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$parents = array_unique($children->values());
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$deletableLeafNodes = array_diff($editableIDs, $parents);
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// Combine the two
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$deletable = array_merge($deletableParents, $deletableLeafNodes);
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} else {
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$deletable = $editableIDs;
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}
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}
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// Convert the array of deletable IDs into a map of the original IDs with true/false as the value
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return array_fill_keys($deletable, true) + array_fill_keys($ids, false);
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}
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/**
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* @param int $id
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* @param Member|null $member
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* @return bool|mixed
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*/
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public function canDelete($id, Member $member = null)
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{
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// No ID: Check default permission
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if (!$id) {
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return $this->checkDefaultPermissions(self::DELETE, $member);
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}
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// Regular canEdit logic is handled by canEditMultiple
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$results = $this->canDeleteMultiple(
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[$id],
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$member
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);
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// Check if in result
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return isset($results[$id]) ? $results[$id] : false;
|
|
}
|
|
|
|
/**
|
|
* @param int $id
|
|
* @param Member|null $member
|
|
* @return bool|mixed
|
|
*/
|
|
public function canEdit($id, Member $member = null)
|
|
{
|
|
// No ID: Check default permission
|
|
if (!$id) {
|
|
return $this->checkDefaultPermissions(self::EDIT, $member);
|
|
}
|
|
|
|
// Regular canEdit logic is handled by canEditMultiple
|
|
$results = $this->canEditMultiple(
|
|
[$id],
|
|
$member
|
|
);
|
|
|
|
// Check if in result
|
|
return isset($results[$id]) ? $results[$id] : false;
|
|
}
|
|
|
|
/**
|
|
* @param int $id
|
|
* @param Member|null $member
|
|
* @return bool|mixed
|
|
*/
|
|
public function canView($id, Member $member = null)
|
|
{
|
|
// No ID: Check default permission
|
|
if (!$id) {
|
|
return $this->checkDefaultPermissions(self::VIEW, $member);
|
|
}
|
|
|
|
// Regular canView logic is handled by canViewMultiple
|
|
$results = $this->canViewMultiple(
|
|
[$id],
|
|
$member
|
|
);
|
|
|
|
// Check if in result
|
|
return isset($results[$id]) ? $results[$id] : false;
|
|
}
|
|
|
|
/**
|
|
* Get field to check for permission type for the given check.
|
|
* Defaults to those provided by {@see InheritedPermissionsExtension)
|
|
*
|
|
* @param string $type
|
|
* @return string
|
|
*/
|
|
protected function getPermissionField($type)
|
|
{
|
|
switch ($type) {
|
|
case self::DELETE:
|
|
// Delete uses edit type - Drop through
|
|
case self::EDIT:
|
|
return 'CanEditType';
|
|
case self::VIEW:
|
|
return 'CanViewType';
|
|
default:
|
|
throw new InvalidArgumentException("Invalid argument type $type");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get join table for type
|
|
* Defaults to those provided by {@see InheritedPermissionsExtension)
|
|
*
|
|
* @param string $type
|
|
* @return string
|
|
*/
|
|
protected function getJoinTable($type)
|
|
{
|
|
switch ($type) {
|
|
case self::DELETE:
|
|
// Delete uses edit type - Drop through
|
|
case self::EDIT:
|
|
return $this->getEditorGroupsTable();
|
|
case self::VIEW:
|
|
return $this->getViewerGroupsTable();
|
|
default:
|
|
throw new InvalidArgumentException("Invalid argument type $type");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Determine default permission for a givion check
|
|
*
|
|
* @param string $type Method to check
|
|
* @param Member $member
|
|
* @return bool
|
|
*/
|
|
protected function checkDefaultPermissions($type, Member $member = null)
|
|
{
|
|
$defaultPermissions = $this->getDefaultPermissions();
|
|
if (!$defaultPermissions) {
|
|
return false;
|
|
}
|
|
switch ($type) {
|
|
case self::VIEW:
|
|
return $defaultPermissions->canView($member);
|
|
case self::EDIT:
|
|
return $defaultPermissions->canEdit($member);
|
|
case self::DELETE:
|
|
return $defaultPermissions->canDelete($member);
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if this model has versioning
|
|
*
|
|
* @return bool
|
|
*/
|
|
protected function isVersioned()
|
|
{
|
|
if (!class_exists(Versioned::class)) {
|
|
return false;
|
|
}
|
|
/** @var Versioned|DataObject $singleton */
|
|
$singleton = DataObject::singleton($this->getBaseClass());
|
|
return $singleton->hasExtension(Versioned::class) && $singleton->hasStages();
|
|
}
|
|
|
|
/**
|
|
* @return $this
|
|
*/
|
|
public function clearCache()
|
|
{
|
|
$this->cachePermissions = [];
|
|
return $this;
|
|
}
|
|
|
|
/**
|
|
* Get table to use for editor groups relation
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function getEditorGroupsTable()
|
|
{
|
|
$table = DataObject::getSchema()->tableName($this->baseClass);
|
|
return "{$table}_EditorGroups";
|
|
}
|
|
|
|
/**
|
|
* Get table to use for viewer groups relation
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function getViewerGroupsTable()
|
|
{
|
|
$table = DataObject::getSchema()->tableName($this->baseClass);
|
|
return "{$table}_ViewerGroups";
|
|
}
|
|
|
|
/**
|
|
* Gets the permission from cache
|
|
*
|
|
* @param string $cacheKey
|
|
* @return mixed
|
|
*/
|
|
protected function getCachePermissions($cacheKey)
|
|
{
|
|
// Check local cache
|
|
if (isset($this->cachePermissions[$cacheKey])) {
|
|
return $this->cachePermissions[$cacheKey];
|
|
}
|
|
|
|
// Check persistent cache
|
|
if ($this->cacheService) {
|
|
$result = $this->cacheService->get($cacheKey);
|
|
|
|
// Warm local cache
|
|
if ($result) {
|
|
$this->cachePermissions[$cacheKey] = $result;
|
|
return $result;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Creates a cache key for a member and type
|
|
*
|
|
* @param string $type
|
|
* @param int $memberID
|
|
* @return string
|
|
*/
|
|
protected function generateCacheKey($type, $memberID)
|
|
{
|
|
$classKey = str_replace('\\', '-', $this->baseClass);
|
|
return "{$type}-{$classKey}-{$memberID}";
|
|
}
|
|
}
|