BookStack/app/Auth/Permissions/PermissionService.php

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<?php
namespace BookStack\Auth\Permissions;
use BookStack\Auth\Role;
use BookStack\Auth\User;
use BookStack\Entities\Models\Book;
use BookStack\Entities\Models\BookChild;
use BookStack\Entities\Models\Bookshelf;
use BookStack\Entities\Models\Chapter;
use BookStack\Entities\Models\Entity;
use BookStack\Entities\Models\Page;
use BookStack\Model;
use BookStack\Traits\HasCreatorAndUpdater;
use BookStack\Traits\HasOwner;
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use Illuminate\Database\Connection;
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use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Collection as EloquentCollection;
use Illuminate\Database\Query\Builder as QueryBuilder;
use Throwable;
class PermissionService
{
/**
* @var ?array
*/
protected $userRoles = null;
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/**
* @var ?User
*/
protected $currentUserModel = null;
/**
* @var Connection
*/
protected $db;
/**
* @var array<string, array<int, Entity>>
*/
protected $entityCache;
/**
* PermissionService constructor.
*/
public function __construct(Connection $db)
{
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$this->db = $db;
}
/**
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* Set the database connection.
*/
public function setConnection(Connection $connection)
{
$this->db = $connection;
}
/**
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* Prepare the local entity cache and ensure it's empty.
*
* @param Entity[] $entities
*/
protected function readyEntityCache(array $entities = [])
{
$this->entityCache = [];
foreach ($entities as $entity) {
$class = get_class($entity);
if (!isset($this->entityCache[$class])) {
$this->entityCache[$class] = [];
}
$this->entityCache[$class][$entity->getRawAttribute('id')] = $entity;
}
}
/**
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* Get a book via ID, Checks local cache.
*/
protected function getBook(int $bookId): ?Book
{
if ($this->entityCache[Book::class][$bookId] ?? false) {
return $this->entityCache[Book::class][$bookId];
}
return Book::query()->withTrashed()->find($bookId);
}
/**
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* Get a chapter via ID, Checks local cache.
*/
protected function getChapter(int $chapterId): ?Chapter
{
if ($this->entityCache[Chapter::class][$chapterId] ?? false) {
return $this->entityCache[Chapter::class][$chapterId];
}
return Chapter::query()
->withTrashed()
->find($chapterId);
}
/**
* Get the roles for the current logged in user.
*/
protected function getCurrentUserRoles(): array
{
if (!is_null($this->userRoles)) {
return $this->userRoles;
}
if (auth()->guest()) {
$this->userRoles = [Role::getSystemRole('public')->id];
} else {
$this->userRoles = $this->currentUser()->roles->pluck('id')->values()->all();
}
return $this->userRoles;
}
/**
* Re-generate all entity permission from scratch.
*/
public function buildJointPermissions()
{
JointPermission::query()->truncate();
$this->readyEntityCache();
// Get all roles (Should be the most limited dimension)
$roles = Role::query()->with('permissions')->get()->all();
// Chunk through all books
$this->bookFetchQuery()->chunk(5, function (EloquentCollection $books) use ($roles) {
$this->buildJointPermissionsForBooks($books, $roles);
});
// Chunk through all bookshelves
Bookshelf::query()->withTrashed()->select(['id', 'restricted', 'owned_by'])
->chunk(50, function (EloquentCollection $shelves) use ($roles) {
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$this->buildJointPermissionsForShelves($shelves, $roles);
});
}
/**
* Get a query for fetching a book with it's children.
*/
protected function bookFetchQuery(): Builder
{
return Book::query()->withTrashed()
->select(['id', 'restricted', 'owned_by'])->with([
'chapters' => function ($query) {
$query->withTrashed()->select(['id', 'restricted', 'owned_by', 'book_id']);
},
'pages' => function ($query) {
$query->withTrashed()->select(['id', 'restricted', 'owned_by', 'book_id', 'chapter_id']);
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},
]);
}
/**
* Build joint permissions for the given shelf and role combinations.
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*
* @throws Throwable
*/
protected function buildJointPermissionsForShelves(EloquentCollection $shelves, array $roles, bool $deleteOld = false)
{
if ($deleteOld) {
$this->deleteManyJointPermissionsForEntities($shelves->all());
}
$this->createManyJointPermissions($shelves->all(), $roles);
}
/**
* Build joint permissions for the given book and role combinations.
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*
* @throws Throwable
*/
protected function buildJointPermissionsForBooks(EloquentCollection $books, array $roles, bool $deleteOld = false)
{
$entities = clone $books;
/** @var Book $book */
foreach ($books->all() as $book) {
foreach ($book->getRelation('chapters') as $chapter) {
$entities->push($chapter);
}
foreach ($book->getRelation('pages') as $page) {
$entities->push($page);
}
}
if ($deleteOld) {
$this->deleteManyJointPermissionsForEntities($entities->all());
}
$this->createManyJointPermissions($entities->all(), $roles);
}
/**
* Rebuild the entity jointPermissions for a particular entity.
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*
* @throws Throwable
*/
public function buildJointPermissionsForEntity(Entity $entity)
{
$entities = [$entity];
if ($entity instanceof Book) {
$books = $this->bookFetchQuery()->where('id', '=', $entity->id)->get();
$this->buildJointPermissionsForBooks($books, Role::query()->with('permissions')->get()->all(), true);
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return;
}
/** @var BookChild $entity */
if ($entity->book) {
$entities[] = $entity->book;
}
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if ($entity instanceof Page && $entity->chapter_id) {
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$entities[] = $entity->chapter;
}
if ($entity instanceof Chapter) {
foreach ($entity->pages as $page) {
$entities[] = $page;
}
}
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$this->buildJointPermissionsForEntities($entities);
}
/**
* Rebuild the entity jointPermissions for a collection of entities.
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*
* @throws Throwable
*/
public function buildJointPermissionsForEntities(array $entities)
{
$roles = Role::query()->get()->values()->all();
$this->deleteManyJointPermissionsForEntities($entities);
$this->createManyJointPermissions($entities, $roles);
}
/**
* Build the entity jointPermissions for a particular role.
*/
public function buildJointPermissionForRole(Role $role)
{
$roles = [$role];
$this->deleteManyJointPermissionsForRoles($roles);
// Chunk through all books
$this->bookFetchQuery()->chunk(20, function ($books) use ($roles) {
$this->buildJointPermissionsForBooks($books, $roles);
});
// Chunk through all bookshelves
Bookshelf::query()->select(['id', 'restricted', 'owned_by'])
->chunk(50, function ($shelves) use ($roles) {
$this->buildJointPermissionsForShelves($shelves, $roles);
});
}
/**
* Delete the entity jointPermissions attached to a particular role.
*/
public function deleteJointPermissionsForRole(Role $role)
{
$this->deleteManyJointPermissionsForRoles([$role]);
}
/**
* Delete all the entity jointPermissions for a list of entities.
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*
* @param Role[] $roles
*/
protected function deleteManyJointPermissionsForRoles($roles)
{
$roleIds = array_map(function ($role) {
return $role->id;
}, $roles);
JointPermission::query()->whereIn('role_id', $roleIds)->delete();
}
/**
* Delete all the entity jointPermissions for a list of entities.
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*
* @param Entity[] $entities
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*
* @throws Throwable
*/
protected function deleteManyJointPermissionsForEntities(array $entities)
{
$idsByType = $this->entitiesToTypeIdMap($entities);
$this->db->transaction(function () use ($idsByType) {
foreach ($idsByType as $type => $ids) {
foreach (array_chunk($ids, 1000) as $idChunk) {
$this->db->table('joint_permissions')
->where('entity_type', '=', $type)
->whereIn('entity_id', $idChunk)
->delete();
}
}
});
}
/**
* Create & Save entity jointPermissions for many entities and roles.
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*
* @param Entity[] $entities
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* @param Role[] $roles
*
* @throws Throwable
*/
protected function createManyJointPermissions(array $entities, array $roles)
{
$this->readyEntityCache($entities);
$jointPermissions = [];
// Create a mapping of entity restricted statuses
$entityRestrictedMap = [];
foreach ($entities as $entity) {
$entityRestrictedMap[$entity->getMorphClass() . ':' . $entity->getRawAttribute('id')] = boolval($entity->getRawAttribute('restricted'));
}
// Fetch related entity permissions
$permissions = $this->getEntityPermissionsForEntities($entities);
// Create a mapping of explicit entity permissions
$permissionMap = [];
foreach ($permissions as $permission) {
$key = $permission->restrictable_type . ':' . $permission->restrictable_id . ':' . $permission->role_id . ':' . $permission->action;
$isRestricted = $entityRestrictedMap[$permission->restrictable_type . ':' . $permission->restrictable_id];
$permissionMap[$key] = $isRestricted;
}
// Create a mapping of role permissions
$rolePermissionMap = [];
foreach ($roles as $role) {
foreach ($role->permissions as $permission) {
$rolePermissionMap[$role->getRawAttribute('id') . ':' . $permission->getRawAttribute('name')] = true;
}
}
// Create Joint Permission Data
foreach ($entities as $entity) {
foreach ($roles as $role) {
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foreach ($this->getActions($entity) as $action) {
$jointPermissions[] = $this->createJointPermissionData($entity, $role, $action, $permissionMap, $rolePermissionMap);
}
}
}
$this->db->transaction(function () use ($jointPermissions) {
foreach (array_chunk($jointPermissions, 1000) as $jointPermissionChunk) {
$this->db->table('joint_permissions')->insert($jointPermissionChunk);
}
});
}
/**
* From the given entity list, provide back a mapping of entity types to
* the ids of that given type. The type used is the DB morph class.
* @param Entity[] $entities
* @return array<string, int[]>
*/
protected function entitiesToTypeIdMap(array $entities): array
{
$idsByType = [];
foreach ($entities as $entity) {
$type = $entity->getMorphClass();
if (!isset($idsByType[$type])) {
$idsByType[$type] = [];
}
$idsByType[$type][] = $entity->getRawAttribute('id');
}
return $idsByType;
}
/**
* Get the entity permissions for all the given entities
* @param Entity[] $entities
* @return EloquentCollection
*/
protected function getEntityPermissionsForEntities(array $entities)
{
$idsByType = $this->entitiesToTypeIdMap($entities);
$permissionFetch = EntityPermission::query();
foreach ($idsByType as $type => $ids) {
$permissionFetch->orWhere(function (Builder $query) use ($type, $ids) {
$query->where('restrictable_type', '=', $type)->whereIn('restrictable_id', $ids);
});
}
return $permissionFetch->get();
}
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/**
* Get the actions related to an entity.
*/
protected function getActions(Entity $entity): array
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{
$baseActions = ['view', 'update', 'delete'];
if ($entity instanceof Chapter || $entity instanceof Book) {
$baseActions[] = 'page-create';
}
if ($entity instanceof Book) {
$baseActions[] = 'chapter-create';
}
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return $baseActions;
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}
/**
* Create entity permission data for an entity and role
* for a particular action.
*/
protected function createJointPermissionData(Entity $entity, Role $role, string $action, array $permissionMap, array $rolePermissionMap): array
{
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$permissionPrefix = (strpos($action, '-') === false ? ($entity->getType() . '-') : '') . $action;
$roleHasPermission = isset($rolePermissionMap[$role->getRawAttribute('id') . ':' . $permissionPrefix . '-all']);
$roleHasPermissionOwn = isset($rolePermissionMap[$role->getRawAttribute('id') . ':' . $permissionPrefix . '-own']);
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$explodedAction = explode('-', $action);
$restrictionAction = end($explodedAction);
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if ($role->system_name === 'admin') {
return $this->createJointPermissionDataArray($entity, $role, $action, true, true);
}
if ($entity->restricted) {
$hasAccess = $this->mapHasActiveRestriction($permissionMap, $entity, $role, $restrictionAction);
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return $this->createJointPermissionDataArray($entity, $role, $action, $hasAccess, $hasAccess);
}
if ($entity instanceof Book || $entity instanceof Bookshelf) {
return $this->createJointPermissionDataArray($entity, $role, $action, $roleHasPermission, $roleHasPermissionOwn);
}
// For chapters and pages, Check if explicit permissions are set on the Book.
$book = $this->getBook($entity->book_id);
$hasExplicitAccessToParents = $this->mapHasActiveRestriction($permissionMap, $book, $role, $restrictionAction);
$hasPermissiveAccessToParents = !$book->restricted;
// For pages with a chapter, Check if explicit permissions are set on the Chapter
if ($entity instanceof Page && intval($entity->chapter_id) !== 0) {
$chapter = $this->getChapter($entity->chapter_id);
$hasPermissiveAccessToParents = $hasPermissiveAccessToParents && !$chapter->restricted;
if ($chapter->restricted) {
$hasExplicitAccessToParents = $this->mapHasActiveRestriction($permissionMap, $chapter, $role, $restrictionAction);
}
}
return $this->createJointPermissionDataArray(
$entity,
$role,
$action,
($hasExplicitAccessToParents || ($roleHasPermission && $hasPermissiveAccessToParents)),
($hasExplicitAccessToParents || ($roleHasPermissionOwn && $hasPermissiveAccessToParents))
);
}
/**
* Check for an active restriction in an entity map.
*/
protected function mapHasActiveRestriction(array $entityMap, Entity $entity, Role $role, string $action): bool
{
$key = $entity->getMorphClass() . ':' . $entity->getRawAttribute('id') . ':' . $role->getRawAttribute('id') . ':' . $action;
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return $entityMap[$key] ?? false;
}
/**
* Create an array of data with the information of an entity jointPermissions.
* Used to build data for bulk insertion.
*/
protected function createJointPermissionDataArray(Entity $entity, Role $role, string $action, bool $permissionAll, bool $permissionOwn): array
{
return [
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'role_id' => $role->getRawAttribute('id'),
'entity_id' => $entity->getRawAttribute('id'),
'entity_type' => $entity->getMorphClass(),
'action' => $action,
'has_permission' => $permissionAll,
'has_permission_own' => $permissionOwn,
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'owned_by' => $entity->getRawAttribute('owned_by'),
];
}
/**
* Checks if an entity has a restriction set upon it.
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*
* @param HasCreatorAndUpdater|HasOwner $ownable
*/
public function checkOwnableUserAccess(Model $ownable, string $permission): bool
{
$explodedPermission = explode('-', $permission);
$baseQuery = $ownable->newQuery()->where('id', '=', $ownable->id);
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$action = end($explodedPermission);
$user = $this->currentUser();
$nonJointPermissions = ['restrictions', 'image', 'attachment', 'comment'];
// Handle non entity specific jointPermissions
if (in_array($explodedPermission[0], $nonJointPermissions)) {
$allPermission = $user && $user->can($permission . '-all');
$ownPermission = $user && $user->can($permission . '-own');
$ownerField = ($ownable instanceof Entity) ? 'owned_by' : 'created_by';
$isOwner = $user && $user->id === $ownable->$ownerField;
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return $allPermission || ($isOwner && $ownPermission);
}
// Handle abnormal create jointPermissions
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if ($action === 'create') {
$action = $permission;
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}
$hasAccess = $this->entityRestrictionQuery($baseQuery, $action)->count() > 0;
$this->clean();
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return $hasAccess;
}
/**
* Checks if a user has the given permission for any items in the system.
* Can be passed an entity instance to filter on a specific type.
*/
public function checkUserHasPermissionOnAnything(string $permission, ?string $entityClass = null): bool
{
$userRoleIds = $this->currentUser()->roles()->select('id')->pluck('id')->toArray();
$userId = $this->currentUser()->id;
$permissionQuery = JointPermission::query()
->where('action', '=', $permission)
->whereIn('role_id', $userRoleIds)
->where(function (Builder $query) use ($userId) {
$this->addJointHasPermissionCheck($query, $userId);
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});
if (!is_null($entityClass)) {
$entityInstance = app($entityClass);
$permissionQuery = $permissionQuery->where('entity_type', '=', $entityInstance->getMorphClass());
}
$hasPermission = $permissionQuery->count() > 0;
$this->clean();
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return $hasPermission;
}
/**
* The general query filter to remove all entities
* that the current user does not have access to.
*/
protected function entityRestrictionQuery(Builder $query, string $action): Builder
{
$q = $query->where(function ($parentQuery) use ($action) {
$parentQuery->whereHas('jointPermissions', function ($permissionQuery) use ($action) {
$permissionQuery->whereIn('role_id', $this->getCurrentUserRoles())
->where('action', '=', $action)
->where(function (Builder $query) {
$this->addJointHasPermissionCheck($query, $this->currentUser()->id);
});
});
});
$this->clean();
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return $q;
}
/**
* Limited the given entity query so that the query will only
* return items that the user has permission for the given ability.
*/
public function restrictEntityQuery(Builder $query, string $ability = 'view'): Builder
{
$this->clean();
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return $query->where(function (Builder $parentQuery) use ($ability) {
$parentQuery->whereHas('jointPermissions', function (Builder $permissionQuery) use ($ability) {
$permissionQuery->whereIn('role_id', $this->getCurrentUserRoles())
->where('action', '=', $ability)
->where(function (Builder $query) {
$this->addJointHasPermissionCheck($query, $this->currentUser()->id);
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});
});
});
}
/**
* Extend the given page query to ensure draft items are not visible
* unless created by the given user.
*/
public function enforceDraftVisibilityOnQuery(Builder $query): Builder
{
return $query->where(function (Builder $query) {
$query->where('draft', '=', false)
->orWhere(function (Builder $query) {
$query->where('draft', '=', true)
->where('owned_by', '=', $this->currentUser()->id);
});
});
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}
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/**
* Add restrictions for a generic entity.
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*/
public function enforceEntityRestrictions(Entity $entity, Builder $query, string $action = 'view'): Builder
{
if ($entity instanceof Page) {
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// Prevent drafts being visible to others.
$this->enforceDraftVisibilityOnQuery($query);
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}
return $this->entityRestrictionQuery($query, $action);
}
/**
* Filter items that have entities set as a polymorphic relation.
* For simplicity, this will not return results attached to draft pages.
* Draft pages should never really have related items though.
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*
* @param Builder|QueryBuilder $query
*/
public function filterRestrictedEntityRelations($query, string $tableName, string $entityIdColumn, string $entityTypeColumn, string $action = 'view')
{
$tableDetails = ['tableName' => $tableName, 'entityIdColumn' => $entityIdColumn, 'entityTypeColumn' => $entityTypeColumn];
$pageMorphClass = (new Page())->getMorphClass();
$q = $query->whereExists(function ($permissionQuery) use (&$tableDetails, $action) {
/** @var Builder $permissionQuery */
$permissionQuery->select(['role_id'])->from('joint_permissions')
->whereColumn('joint_permissions.entity_id', '=', $tableDetails['tableName'] . '.' . $tableDetails['entityIdColumn'])
->whereColumn('joint_permissions.entity_type', '=', $tableDetails['tableName'] . '.' . $tableDetails['entityTypeColumn'])
->where('joint_permissions.action', '=', $action)
->whereIn('joint_permissions.role_id', $this->getCurrentUserRoles())
->where(function (QueryBuilder $query) {
$this->addJointHasPermissionCheck($query, $this->currentUser()->id);
});
})->where(function ($query) use ($tableDetails, $pageMorphClass) {
/** @var Builder $query */
$query->where($tableDetails['entityTypeColumn'], '!=', $pageMorphClass)
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->orWhereExists(function (QueryBuilder $query) use ($tableDetails, $pageMorphClass) {
$query->select('id')->from('pages')
->whereColumn('pages.id', '=', $tableDetails['tableName'] . '.' . $tableDetails['entityIdColumn'])
->where($tableDetails['tableName'] . '.' . $tableDetails['entityTypeColumn'], '=', $pageMorphClass)
->where('pages.draft', '=', false);
});
});
$this->clean();
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return $q;
}
/**
* Add conditions to a query to filter the selection to related entities
* where view permissions are granted.
*/
public function filterRelatedEntity(string $entityClass, Builder $query, string $tableName, string $entityIdColumn): Builder
{
$fullEntityIdColumn = $tableName . '.' . $entityIdColumn;
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$instance = new $entityClass();
$morphClass = $instance->getMorphClass();
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$existsQuery = function ($permissionQuery) use ($fullEntityIdColumn, $morphClass) {
/** @var Builder $permissionQuery */
$permissionQuery->select('joint_permissions.role_id')->from('joint_permissions')
->whereColumn('joint_permissions.entity_id', '=', $fullEntityIdColumn)
->where('joint_permissions.entity_type', '=', $morphClass)
->where('joint_permissions.action', '=', 'view')
->whereIn('joint_permissions.role_id', $this->getCurrentUserRoles())
->where(function (QueryBuilder $query) {
$this->addJointHasPermissionCheck($query, $this->currentUser()->id);
});
};
$q = $query->where(function ($query) use ($existsQuery, $fullEntityIdColumn) {
$query->whereExists($existsQuery)
->orWhere($fullEntityIdColumn, '=', 0);
});
if ($instance instanceof Page) {
// Prevent visibility of non-owned draft pages
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$q->whereExists(function (QueryBuilder $query) use ($fullEntityIdColumn) {
$query->select('id')->from('pages')
->whereColumn('pages.id', '=', $fullEntityIdColumn)
->where(function (QueryBuilder $query) {
$query->where('pages.draft', '=', false)
->orWhere('pages.owned_by', '=', $this->currentUser()->id);
});
});
}
$this->clean();
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return $q;
}
/**
* Add the query for checking the given user id has permission
* within the join_permissions table.
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*
* @param QueryBuilder|Builder $query
*/
protected function addJointHasPermissionCheck($query, int $userIdToCheck)
{
$query->where('joint_permissions.has_permission', '=', true)->orWhere(function ($query) use ($userIdToCheck) {
$query->where('joint_permissions.has_permission_own', '=', true)
->where('joint_permissions.owned_by', '=', $userIdToCheck);
});
}
/**
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* Get the current user.
*/
private function currentUser(): User
{
if (is_null($this->currentUserModel)) {
$this->currentUserModel = user();
}
return $this->currentUserModel;
}
/**
* Clean the cached user elements.
*/
private function clean(): void
{
$this->currentUserModel = null;
$this->userRoles = null;
}
}