BookStack/app/Auth/Permissions/PermissionApplicator.php

283 lines
11 KiB
PHP

<?php
namespace BookStack\Auth\Permissions;
use BookStack\Auth\Role;
use BookStack\Auth\User;
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;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Query\Builder as QueryBuilder;
use InvalidArgumentException;
class PermissionApplicator
{
/**
* Checks if an entity has a restriction set upon it.
*
* @param HasCreatorAndUpdater|HasOwner $ownable
*/
public function checkOwnableUserAccess(Model $ownable, string $permission): bool
{
$explodedPermission = explode('-', $permission);
$action = $explodedPermission[1] ?? $explodedPermission[0];
$fullPermission = count($explodedPermission) > 1 ? $permission : $ownable->getMorphClass() . '-' . $permission;
$user = $this->currentUser();
$userRoleIds = $this->getCurrentUserRoleIds();
$allRolePermission = $user->can($fullPermission . '-all');
$ownRolePermission = $user->can($fullPermission . '-own');
$nonJointPermissions = ['restrictions', 'image', 'attachment', 'comment'];
$ownerField = ($ownable instanceof Entity) ? 'owned_by' : 'created_by';
$ownableFieldVal = $ownable->getAttribute($ownerField);
if (is_null($ownableFieldVal)) {
throw new InvalidArgumentException("{$ownerField} field used but has not been loaded");
}
$isOwner = $user->id === $ownableFieldVal;
$hasRolePermission = $allRolePermission || ($isOwner && $ownRolePermission);
// Handle non entity specific jointPermissions
if (in_array($explodedPermission[0], $nonJointPermissions)) {
return $hasRolePermission;
}
$hasApplicableEntityPermissions = $this->hasEntityPermission($ownable, $userRoleIds, $action);
return is_null($hasApplicableEntityPermissions) ? $hasRolePermission : $hasApplicableEntityPermissions;
}
/**
* Check if there are permissions that are applicable for the given entity item, action and roles.
* Returns null when no entity permissions are in force.
*/
protected function hasEntityPermission(Entity $entity, array $userRoleIds, string $action): ?bool
{
$this->ensureValidEntityAction($action);
$adminRoleId = Role::getSystemRole('admin')->id;
if (in_array($adminRoleId, $userRoleIds)) {
return true;
}
// The chain order here is very important due to the fact we walk up the chain
// in the loop below. Earlier items in the chain have higher priority.
$chain = [$entity];
if ($entity instanceof Page && $entity->chapter_id) {
$chain[] = $entity->chapter;
}
if ($entity instanceof Page || $entity instanceof Chapter) {
$chain[] = $entity->book;
}
foreach ($chain as $currentEntity) {
$allowedByRoleId = $currentEntity->permissions()
->whereIn('role_id', [0, ...$userRoleIds])
->pluck($action, 'role_id');
// Continue up the chain if no applicable entity permission overrides.
if (empty($allowedByRoleId)) {
continue;
}
// If we have user-role-specific permissions set, allow if any of those
// role permissions allow access.
$hasDefault = $allowedByRoleId->has(0);
if (!$hasDefault || $allowedByRoleId->count() > 1) {
return $allowedByRoleId->search(function (bool $allowed, int $roleId) {
return $roleId !== 0 && $allowed;
}) !== false;
}
// Otherwise, return the default "Other roles" fallback value.
return $allowedByRoleId->get(0);
}
return null;
}
/**
* 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 checkUserHasEntityPermissionOnAny(string $action, string $entityClass = ''): bool
{
$this->ensureValidEntityAction($action);
$permissionQuery = EntityPermission::query()
->where($action, '=', true)
->whereIn('role_id', $this->getCurrentUserRoleIds());
if (!empty($entityClass)) {
/** @var Entity $entityInstance */
$entityInstance = app()->make($entityClass);
$permissionQuery = $permissionQuery->where('entity_type', '=', $entityInstance->getMorphClass());
}
$hasPermission = $permissionQuery->count() > 0;
return $hasPermission;
}
/**
* Limit the given entity query so that the query will only
* return items that the user has view permission for.
*/
public function restrictEntityQuery(Builder $query): Builder
{
return $query->where(function (Builder $parentQuery) {
$parentQuery->whereHas('jointPermissions', function (Builder $permissionQuery) {
$permissionQuery->whereIn('role_id', $this->getCurrentUserRoleIds())
->where(function (Builder $query) {
$this->addJointHasPermissionCheck($query, $this->currentUser()->id);
});
});
});
}
/**
* Extend the given page query to ensure draft items are not visible
* unless created by the given user.
*/
public function restrictDraftsOnPageQuery(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);
});
});
}
/**
* 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.
*
* @param Builder|QueryBuilder $query
*/
public function restrictEntityRelationQuery($query, string $tableName, string $entityIdColumn, string $entityTypeColumn)
{
$tableDetails = ['tableName' => $tableName, 'entityIdColumn' => $entityIdColumn, 'entityTypeColumn' => $entityTypeColumn];
$pageMorphClass = (new Page())->getMorphClass();
$q = $query->whereExists(function ($permissionQuery) use (&$tableDetails) {
/** @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'])
->whereIn('joint_permissions.role_id', $this->getCurrentUserRoleIds())
->where(function (QueryBuilder $query) {
$this->addJointHasPermissionCheck($query, $this->currentUser()->id);
});
})->where(function ($query) use ($tableDetails, $pageMorphClass) {
/** @var Builder $query */
$query->where($tableDetails['entityTypeColumn'], '!=', $pageMorphClass)
->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);
});
});
return $q;
}
/**
* Add conditions to a query for a model that's a relation of a page, so only the model results
* on visible pages are returned by the query.
* Is effectively the same as "restrictEntityRelationQuery" but takes into account page drafts
* while not expecting a polymorphic relation, Just a simpler one-page-to-many-relations set-up.
*/
public function restrictPageRelationQuery(Builder $query, string $tableName, string $pageIdColumn): Builder
{
$fullPageIdColumn = $tableName . '.' . $pageIdColumn;
$morphClass = (new Page())->getMorphClass();
$existsQuery = function ($permissionQuery) use ($fullPageIdColumn, $morphClass) {
/** @var Builder $permissionQuery */
$permissionQuery->select('joint_permissions.role_id')->from('joint_permissions')
->whereColumn('joint_permissions.entity_id', '=', $fullPageIdColumn)
->where('joint_permissions.entity_type', '=', $morphClass)
->whereIn('joint_permissions.role_id', $this->getCurrentUserRoleIds())
->where(function (QueryBuilder $query) {
$this->addJointHasPermissionCheck($query, $this->currentUser()->id);
});
};
$q = $query->where(function ($query) use ($existsQuery, $fullPageIdColumn) {
$query->whereExists($existsQuery)
->orWhere($fullPageIdColumn, '=', 0);
});
// Prevent visibility of non-owned draft pages
$q->whereExists(function (QueryBuilder $query) use ($fullPageIdColumn) {
$query->select('id')->from('pages')
->whereColumn('pages.id', '=', $fullPageIdColumn)
->where(function (QueryBuilder $query) {
$query->where('pages.draft', '=', false)
->orWhere('pages.owned_by', '=', $this->currentUser()->id);
});
});
return $q;
}
/**
* Add the query for checking the given user id has permission
* within the join_permissions table.
*
* @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);
});
}
/**
* Get the current user.
*/
protected function currentUser(): User
{
return user();
}
/**
* Get the roles for the current logged-in user.
*
* @return int[]
*/
protected function getCurrentUserRoleIds(): array
{
if (auth()->guest()) {
return [Role::getSystemRole('public')->id];
}
return $this->currentUser()->roles->pluck('id')->values()->all();
}
/**
* Ensure the given action is a valid and expected entity action.
* Throws an exception if invalid otherwise does nothing.
* @throws InvalidArgumentException
*/
protected function ensureValidEntityAction(string $action): void
{
if (!in_array($action, EntityPermission::PERMISSIONS)) {
throw new InvalidArgumentException('Action should be a simple entity permission action, not a role permission');
}
}
}