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142 lines
4.6 KiB
PHP
142 lines
4.6 KiB
PHP
<?php
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namespace BookStack\Auth\Permissions;
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use BookStack\Auth\Role;
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use BookStack\Entities\Models\Entity;
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use Illuminate\Database\Eloquent\Builder;
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class EntityPermissionEvaluator
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{
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protected string $action;
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public function __construct(string $action)
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{
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$this->action = $action;
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}
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public function evaluateEntityForUser(Entity $entity, array $userRoleIds): ?bool
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{
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if ($this->isUserSystemAdmin($userRoleIds)) {
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return true;
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}
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$typeIdChain = $this->gatherEntityChainTypeIds(SimpleEntityData::fromEntity($entity));
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$relevantPermissions = $this->getPermissionsMapByTypeId($typeIdChain, [...$userRoleIds, 0]);
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$permitsByType = $this->collapseAndCategorisePermissions($typeIdChain, $relevantPermissions);
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$status = $this->evaluatePermitsByType($permitsByType);
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return is_null($status) ? null : $status === PermissionStatus::IMPLICIT_ALLOW || $status === PermissionStatus::EXPLICIT_ALLOW;
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}
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/**
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* @param array<string, array<string, int>> $permitsByType
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*/
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protected function evaluatePermitsByType(array $permitsByType): ?int
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{
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// Return grant or reject from role-level if exists
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if (count($permitsByType['role']) > 0) {
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return max($permitsByType['role']) ? PermissionStatus::EXPLICIT_ALLOW : PermissionStatus::EXPLICIT_DENY;
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}
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// Return fallback permission if exists
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if (count($permitsByType['fallback']) > 0) {
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return $permitsByType['fallback'][0] ? PermissionStatus::IMPLICIT_ALLOW : PermissionStatus::IMPLICIT_DENY;
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}
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return null;
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}
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/**
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* @param string[] $typeIdChain
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* @param array<string, EntityPermission[]> $permissionMapByTypeId
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* @return array<string, array<string, int>>
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*/
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protected function collapseAndCategorisePermissions(array $typeIdChain, array $permissionMapByTypeId): array
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{
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$permitsByType = ['fallback' => [], 'role' => []];
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foreach ($typeIdChain as $typeId) {
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$permissions = $permissionMapByTypeId[$typeId] ?? [];
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foreach ($permissions as $permission) {
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$roleId = $permission->role_id;
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$type = $roleId === 0 ? 'fallback' : 'role';
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if (!isset($permitsByType[$type][$roleId])) {
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$permitsByType[$type][$roleId] = $permission->{$this->action};
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}
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}
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if (isset($permitsByType['fallback'][0])) {
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break;
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}
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}
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return $permitsByType;
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}
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/**
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* @param string[] $typeIdChain
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* @return array<string, EntityPermission[]>
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*/
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protected function getPermissionsMapByTypeId(array $typeIdChain, array $filterRoleIds): array
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{
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$query = EntityPermission::query()->where(function (Builder $query) use ($typeIdChain) {
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foreach ($typeIdChain as $typeId) {
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$query->orWhere(function (Builder $query) use ($typeId) {
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[$type, $id] = explode(':', $typeId);
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$query->where('entity_type', '=', $type)
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->where('entity_id', '=', $id);
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});
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}
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});
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if (!empty($filterRoleIds)) {
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$query->where(function (Builder $query) use ($filterRoleIds) {
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$query->whereIn('role_id', [...$filterRoleIds, 0]);
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});
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}
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$relevantPermissions = $query->get(['entity_id', 'entity_type', 'role_id', $this->action])->all();
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$map = [];
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foreach ($relevantPermissions as $permission) {
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$key = $permission->entity_type . ':' . $permission->entity_id;
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if (!isset($map[$key])) {
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$map[$key] = [];
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}
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$map[$key][] = $permission;
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}
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return $map;
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}
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/**
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* @return string[]
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*/
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protected function gatherEntityChainTypeIds(SimpleEntityData $entity): array
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{
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// The array order here is very important due to the fact we walk up the chain
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// elsewhere in the class. Earlier items in the chain have higher priority.
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$chain = [$entity->type . ':' . $entity->id];
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if ($entity->type === 'page' && $entity->chapter_id) {
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$chain[] = 'chapter:' . $entity->chapter_id;
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}
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if ($entity->type === 'page' || $entity->type === 'chapter') {
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$chain[] = 'book:' . $entity->book_id;
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}
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return $chain;
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}
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protected function isUserSystemAdmin($userRoleIds): bool
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{
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$adminRoleId = Role::getSystemRole('admin')->id;
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return in_array($adminRoleId, $userRoleIds);
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}
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}
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