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<?php |
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namespace AlgoWeb\PODataLaravel\Query; |
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use AlgoWeb\PODataLaravel\Auth\NullAuthProvider; |
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use AlgoWeb\PODataLaravel\Enums\ActionVerb; |
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use AlgoWeb\PODataLaravel\Interfaces\AuthInterface; |
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use Illuminate\Database\Eloquent\Model; |
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use Illuminate\Database\Eloquent\Relations\Relation; |
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use Illuminate\Support\Facades\App; |
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use POData\Common\ODataException; |
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use Symfony\Component\Process\Exception\InvalidArgumentException; |
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use POData\Providers\Metadata\ResourceProperty; |
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use POData\Providers\Metadata\ResourceSet; |
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use POData\Providers\Query\QueryResult; |
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use POData\Providers\Query\QueryType; |
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use POData\UriProcessor\QueryProcessor\ExpressionParser\FilterInfo; |
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use POData\UriProcessor\ResourcePathProcessor\SegmentParser\KeyDescriptor; |
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class LaravelReadQuery |
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{ |
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protected $auth; |
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public function __construct(AuthInterface $auth = null) |
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{ |
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$this->auth = isset($auth) ? $auth : new NullAuthProvider(); |
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} |
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/** |
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* Gets collection of entities belongs to an entity set |
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* IE: http://host/EntitySet |
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* http://host/EntitySet?$skip=10&$top=5&filter=Prop gt Value |
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* |
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* @param QueryType $queryType indicates if this is a query for a count, entities, or entities with a count |
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* @param ResourceSet $resourceSet The entity set containing the entities to fetch |
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* @param FilterInfo $filterInfo represents the $filter parameter of the OData query. NULL if no $filter specified |
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* @param mixed $orderBy sorted order if we want to get the data in some specific order |
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* @param int $top number of records which need to be skip |
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* @param String $skipToken value indicating what records to skip |
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* @param Model|Relation|null $sourceEntityInstance Starting point of query |
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* |
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* @return QueryResult |
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*/ |
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public function getResourceSet( |
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QueryType $queryType, |
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ResourceSet $resourceSet, |
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$filterInfo = null, |
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$orderBy = null, |
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$top = null, |
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$skipToken = null, |
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$sourceEntityInstance = null |
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) { |
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if (null != $filterInfo && !($filterInfo instanceof FilterInfo)) { |
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throw new InvalidArgumentException('Filter info must be either null or instance of FilterInfo.'); |
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} |
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$this->checkSourceInstance($sourceEntityInstance); |
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if (null == $sourceEntityInstance) { |
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$sourceEntityInstance = $this->getSourceEntityInstance($resourceSet); |
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} |
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$checkInstance = $sourceEntityInstance instanceof Model ? $sourceEntityInstance : null; |
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$this->checkAuth($sourceEntityInstance, $checkInstance); |
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$result = new QueryResult(); |
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$result->results = null; |
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$result->count = null; |
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if (null != $orderBy) { |
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foreach ($orderBy->getOrderByInfo()->getOrderByPathSegments() as $order) { |
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foreach ($order->getSubPathSegments() as $subOrder) { |
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$sourceEntityInstance = $sourceEntityInstance->orderBy( |
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$subOrder->getName(), |
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$order->isAscending() ? 'asc' : 'desc' |
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); |
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} |
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} |
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} |
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if (!isset($skipToken)) { |
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$skipToken = 0; |
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} |
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if (!isset($top)) { |
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$top = PHP_INT_MAX; |
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} |
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$nullFilter = true; |
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$isvalid = null; |
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if (isset($filterInfo)) { |
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$method = "return ".$filterInfo->getExpressionAsString().";"; |
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$clln = "$".$resourceSet->getResourceType()->getName(); |
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$isvalid = create_function($clln, $method); |
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$nullFilter = false; |
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} |
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$bulkSetCount = $sourceEntityInstance->count(); |
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$bigSet = 20000 < $bulkSetCount; |
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if ($nullFilter) { |
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// default no-filter case, palm processing off to database engine - is a lot faster |
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$resultSet = $sourceEntityInstance->skip($skipToken)->take($top)->get(); |
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$resultCount = $bulkSetCount; |
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} elseif ($bigSet) { |
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assert(isset($isvalid), "Filter closure not set"); |
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$resultSet = collect([]); |
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$rawCount = 0; |
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$rawTop = null === $top ? $bulkSetCount : $top; |
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// loop thru, chunk by chunk, to reduce chances of exhausting memory |
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$sourceEntityInstance->chunk( |
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5000, |
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function ($results) use ($isvalid, &$skipToken, &$resultSet, &$rawCount, $rawTop) { |
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// apply filter |
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$results = $results->filter($isvalid); |
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// need to iterate through full result set to find count of items matching filter, |
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// so we can't bail out early |
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$rawCount += $results->count(); |
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// now bolt on filtrate to accumulating result set if we haven't accumulated enough bitz |
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if ($rawTop > $resultSet->count() + $skipToken) { |
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$resultSet = collect(array_merge($resultSet->all(), $results->all())); |
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$sliceAmount = min($skipToken, $resultSet->count()); |
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$resultSet = $resultSet->slice($sliceAmount); |
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$skipToken -= $sliceAmount; |
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} |
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} |
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); |
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// clean up residual to-be-skipped records |
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$resultSet = $resultSet->slice($skipToken); |
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$resultCount = $rawCount; |
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} else { |
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$resultSet = $sourceEntityInstance->get(); |
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$resultSet = $resultSet->filter($isvalid); |
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$resultCount = $resultSet->count(); |
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if (isset($skipToken)) { |
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$resultSet = $resultSet->slice($skipToken); |
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} |
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} |
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if (isset($top)) { |
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$resultSet = $resultSet->take($top); |
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} |
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if (QueryType::ENTITIES() == $queryType || QueryType::ENTITIES_WITH_COUNT() == $queryType) { |
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$result->results = array(); |
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foreach ($resultSet as $res) { |
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$result->results[] = $res; |
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} |
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} |
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if (QueryType::COUNT() == $queryType || QueryType::ENTITIES_WITH_COUNT() == $queryType) { |
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$result->count = $resultCount; |
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} |
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return $result; |
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} |
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/** |
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* Get related resource set for a resource |
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* IE: http://host/EntitySet(1L)/NavigationPropertyToCollection |
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* http://host/EntitySet?$expand=NavigationPropertyToCollection |
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* |
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* @param QueryType $queryType indicates if this is a query for a count, entities, or entities with a count |
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* @param ResourceSet $sourceResourceSet The entity set containing the source entity |
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* @param object $sourceEntityInstance The source entity instance. |
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* @param ResourceSet $targetResourceSet The resource set of containing the target of the navigation property |
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* @param ResourceProperty $targetProperty The navigation property to retrieve |
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* @param FilterInfo $filter represents the $filter parameter of the OData query. NULL if no $filter specified |
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* @param mixed $orderBy sorted order if we want to get the data in some specific order |
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* @param int $top number of records which need to be skip |
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* @param String $skip value indicating what records to skip |
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* |
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* @return QueryResult |
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* |
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*/ |
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public function getRelatedResourceSet( |
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QueryType $queryType, |
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ResourceSet $sourceResourceSet, |
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$sourceEntityInstance, |
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ResourceSet $targetResourceSet, |
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ResourceProperty $targetProperty, |
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$filter = null, |
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$orderBy = null, |
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$top = null, |
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$skip = null |
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) { |
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if (!($sourceEntityInstance instanceof Model)) { |
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throw new InvalidArgumentException('Source entity must be an Eloquent model.'); |
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} |
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assert(null != $sourceEntityInstance, "Source instance must not be null"); |
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$this->checkSourceInstance($sourceEntityInstance); |
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$this->checkAuth($sourceEntityInstance); |
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$propertyName = $targetProperty->getName(); |
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$results = $sourceEntityInstance->$propertyName(); |
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return $this->getResourceSet( |
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$queryType, |
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$sourceResourceSet, |
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$filter, |
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$orderBy, |
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$top, |
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$skip, |
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$results |
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); |
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} |
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/** |
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* Gets an entity instance from an entity set identified by a key |
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* IE: http://host/EntitySet(1L) |
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* http://host/EntitySet(KeyA=2L,KeyB='someValue') |
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* |
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* @param ResourceSet $resourceSet The entity set containing the entity to fetch |
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* @param KeyDescriptor $keyDescriptor The key identifying the entity to fetch |
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* |
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* @return object|null Returns entity instance if found else null |
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*/ |
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public function getResourceFromResourceSet( |
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ResourceSet $resourceSet, |
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KeyDescriptor $keyDescriptor = null |
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) { |
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return $this->getResource($resourceSet, $keyDescriptor); |
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} |
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/** |
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* Common method for getResourceFromRelatedResourceSet() and getResourceFromResourceSet() |
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* @param ResourceSet|null $resourceSet |
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* @param KeyDescriptor|null $keyDescriptor |
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* @param Model|Relation|null $sourceEntityInstance Starting point of query |
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*/ |
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public function getResource( |
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ResourceSet $resourceSet = null, |
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KeyDescriptor $keyDescriptor = null, |
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array $whereCondition = [], |
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$sourceEntityInstance = null |
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) { |
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if (null == $resourceSet && null == $sourceEntityInstance) { |
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throw new \Exception('Must supply at least one of a resource set and source entity.'); |
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} |
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$this->checkSourceInstance($sourceEntityInstance); |
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if (null == $sourceEntityInstance) { |
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assert(null != $resourceSet); |
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$sourceEntityInstance = $this->getSourceEntityInstance($resourceSet); |
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} |
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$this->checkAuth($sourceEntityInstance); |
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if ($keyDescriptor) { |
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foreach ($keyDescriptor->getValidatedNamedValues() as $key => $value) { |
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$trimValue = trim($value[0], "\"'"); |
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$sourceEntityInstance = $sourceEntityInstance->where($key, $trimValue); |
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} |
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} |
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foreach ($whereCondition as $fieldName => $fieldValue) { |
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$sourceEntityInstance = $sourceEntityInstance->where($fieldName, $fieldValue); |
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} |
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$sourceEntityInstance = $sourceEntityInstance->get(); |
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return (0 == $sourceEntityInstance->count()) ? null : $sourceEntityInstance->first(); |
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} |
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/** |
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* Get related resource for a resource |
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* IE: http://host/EntitySet(1L)/NavigationPropertyToSingleEntity |
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* http://host/EntitySet?$expand=NavigationPropertyToSingleEntity |
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* |
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* @param ResourceSet $sourceResourceSet The entity set containing the source entity |
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* @param object $sourceEntityInstance The source entity instance. |
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* @param ResourceSet $targetResourceSet The entity set containing the entity pointed to by the navigation property |
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* @param ResourceProperty $targetProperty The navigation property to fetch |
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* |
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* @return object|null The related resource if found else null |
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*/ |
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View Code Duplication |
public function getRelatedResourceReference( |
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ResourceSet $sourceResourceSet, |
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$sourceEntityInstance, |
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ResourceSet $targetResourceSet, |
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ResourceProperty $targetProperty |
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) { |
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if (!($sourceEntityInstance instanceof Model)) { |
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throw new InvalidArgumentException('Source entity must be an Eloquent model.'); |
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} |
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$this->checkSourceInstance($sourceEntityInstance); |
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$this->checkAuth($sourceEntityInstance); |
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$propertyName = $targetProperty->getName(); |
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return $sourceEntityInstance->$propertyName; |
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} |
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/** |
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* Gets a related entity instance from an entity set identified by a key |
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* IE: http://host/EntitySet(1L)/NavigationPropertyToCollection(33) |
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* |
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* @param ResourceSet $sourceResourceSet The entity set containing the source entity |
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* @param object $sourceEntityInstance The source entity instance. |
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* @param ResourceSet $targetResourceSet The entity set containing the entity to fetch |
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* @param ResourceProperty $targetProperty The metadata of the target property. |
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* @param KeyDescriptor $keyDescriptor The key identifying the entity to fetch |
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* |
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* @return object|null Returns entity instance if found else null |
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*/ |
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View Code Duplication |
public function getResourceFromRelatedResourceSet( |
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ResourceSet $sourceResourceSet, |
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$sourceEntityInstance, |
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ResourceSet $targetResourceSet, |
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ResourceProperty $targetProperty, |
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KeyDescriptor $keyDescriptor |
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) { |
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if (!($sourceEntityInstance instanceof Model)) { |
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throw new InvalidArgumentException('Source entity must be an Eloquent model.'); |
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} |
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$propertyName = $targetProperty->getName(); |
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return $this->getResource(null, $keyDescriptor, [], $sourceEntityInstance->$propertyName); |
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} |
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/** |
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* @param ResourceSet $resourceSet |
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* @return mixed |
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*/ |
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protected function getSourceEntityInstance(ResourceSet $resourceSet) |
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{ |
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$entityClassName = $resourceSet->getResourceType()->getInstanceType()->name; |
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return App::make($entityClassName); |
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} |
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/** |
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* @param Model|Relation|null $source |
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*/ |
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protected function checkSourceInstance($source) |
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{ |
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if (!(null == $source || $source instanceof Model || $source instanceof Relation)) { |
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throw new InvalidArgumentException('Source entity instance must be null, a model, or a relation.'); |
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} |
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} |
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protected function getAuth() |
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{ |
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return $this->auth; |
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} |
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/** |
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* @param $sourceEntityInstance |
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* @throws ODataException |
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*/ |
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private function checkAuth($sourceEntityInstance, $checkInstance = null) |
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{ |
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$check = $checkInstance instanceof Model ? $checkInstance |
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: $checkInstance instanceof Relation ? $checkInstance |
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: $sourceEntityInstance instanceof Model ? $sourceEntityInstance |
356
|
|
|
: $sourceEntityInstance instanceof Relation ? $sourceEntityInstance |
357
|
|
|
: null; |
358
|
|
|
if (!$this->getAuth()->canAuth(ActionVerb::READ(), get_class($sourceEntityInstance), $check)) { |
359
|
|
|
throw new ODataException("Access denied", 403); |
360
|
|
|
} |
361
|
|
|
} |
362
|
|
|
} |
363
|
|
|
|
create_function
can pose a great security vulnerability as it is similar toeval
, and could be used for arbitrary code execution. We highly recommend to use a closure instead.