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<?php |
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namespace Fathomminds\Rest\Schema; |
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use Fathomminds\Rest\Schema\TypeValidators\ValidatorFactory; |
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use Fathomminds\Rest\Exceptions\RestException; |
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class SchemaValidator |
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{ |
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protected $fields = []; |
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protected $allowExtraneous = false; |
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protected $requiredSchemaClass = null; |
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private $updateMode = false; |
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private $replaceMode = false; |
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public function __construct($requiredSchemaClass = null) |
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{ |
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$this->requiredSchemaClass = $requiredSchemaClass; |
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} |
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public function updateMode($updateMode = null) |
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{ |
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if (is_bool($updateMode)) { |
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$this->updateMode = $updateMode; |
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} |
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return $this->updateMode; |
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} |
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public function replaceMode($replaceMode = null) |
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{ |
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if (is_bool($replaceMode)) { |
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$this->replaceMode = $replaceMode; |
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} |
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return $this->replaceMode; |
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} |
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public function validate($resource) |
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{ |
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$this->validateResourceType($resource); |
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$this->validateCircularDependency(get_class($resource), $resource->schema()); |
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$extraneousCheck = []; |
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if (!$this->allowExtraneous) { |
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$extraneousCheck = $this->validateExtraneousFields($resource); |
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} |
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$errors = array_merge( |
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$this->validateRequiredFields($resource), |
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$extraneousCheck, |
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$this->validateFieldTypes($resource) |
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); |
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if (!empty($errors)) { |
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throw new RestException( |
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'Invalid structure', |
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[ |
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'schema' => get_class($resource), |
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'errors' => $errors, |
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] |
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); |
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} |
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} |
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private function validateCircularDependency($schemaName, $schemaDefinition, $schemaChain = []) |
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{ |
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$schemaChain[] = $schemaName; |
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foreach ($schemaDefinition as $field => $fieldDetails) |
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{ |
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if (!isset($fieldDetails['type']) || $fieldDetails['type'] !== 'schema') { |
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continue; |
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} |
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$nestedSchemaName = $fieldDetails['validator']['class']; |
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$nestedSchemaDefinition = ($nestedSchemaName::cast((object)[]))->schema(); |
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if (in_array($nestedSchemaName, $schemaChain)) { |
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$schemaChain[] = $nestedSchemaName; |
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throw new RestException( |
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'Circular dependency found in schema definition', |
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[ |
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'schema' => array_shift($schemaChain), |
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'chain' => $schemaChain, |
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] |
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); |
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} |
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$this->validateCircularDependency( |
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$nestedSchemaName, |
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$nestedSchemaDefinition, |
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$schemaChain |
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); |
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} |
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} |
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public function allowExtraneous($value) |
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{ |
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$this->allowExtraneous = $value; |
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} |
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private function validateResourceType($resource) |
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{ |
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$this->expectObject($resource); |
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$this->objectHasSchemaMethod($resource); |
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$this->objectIsValidSchemaClass($resource); |
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} |
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private function expectObject($resource) |
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{ |
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if (gettype($resource) !== 'object') { |
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throw new RestException( |
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'Object expected', |
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[ |
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'schema' => static::class, |
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'type' => gettype($resource), |
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] |
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); |
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} |
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} |
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private function objectHasSchemaMethod($resource) |
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{ |
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if (!method_exists($resource, 'schema')) { |
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throw new RestException( |
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'Object must be a correct RestSchema object', |
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[ |
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'schema' => static::class, |
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'type' => gettype($resource), |
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] |
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); |
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} |
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} |
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private function objectIsValidSchemaClass($resource) |
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{ |
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if ($this->requiredSchemaClass === null) { |
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return; |
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} |
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if (get_class($resource) !== $this->requiredSchemaClass) { |
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throw new RestException( |
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'Object must be an instance of the defined SchemaClass', |
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[ |
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'schema' => static::class, |
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'type' => gettype($resource), |
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] |
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); |
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} |
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} |
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private function validateRequiredFields($resource) |
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{ |
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$errors = []; |
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if ($this->updateMode()) { |
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return $errors; |
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} |
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$missingFields = array_diff($this->getRequiredFields($resource), array_keys(get_object_vars($resource))); |
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array_walk($missingFields, function($item) use (&$errors) { |
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$errors[$item] = 'Missing required field'; |
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}); |
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return $errors; |
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} |
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private function validateExtraneousFields($resource) |
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{ |
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$errors = []; |
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$extraFields = array_diff(array_keys(get_object_vars($resource)), array_keys($resource->schema())); |
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array_walk($extraFields, function($item) use (&$errors) { |
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$errors[$item] = 'Extraneous field'; |
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}); |
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return $errors; |
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} |
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private function validateFieldTypes($resource) |
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{ |
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$validatorFactory = new ValidatorFactory; |
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$errors = []; |
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foreach ($resource->schema() as $fieldName => $rules) { |
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if (property_exists($resource, $fieldName)) { |
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try { |
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$validatorFactory |
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->create($rules, $this->updateMode(), $this->replaceMode()) |
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->validate($resource->{$fieldName}); |
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} catch (RestException $ex) { |
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$errors[$fieldName]['error'] = $ex->getMessage(); |
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$errors[$fieldName]['details'] = $ex->getDetails(); |
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} |
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} |
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} |
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return $errors; |
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} |
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private function filterFields($resource, $paramKey, $paramValue, $checkParamValue = true) |
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{ |
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$fields = []; |
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foreach ($resource->schema() as $fieldName => $params) { |
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if (array_key_exists($paramKey, $params) && $this->isMatchedValue( |
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$checkParamValue, |
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$params[$paramKey], |
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$paramValue |
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)) { |
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$fields[$fieldName] = $params; |
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} |
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} |
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return $fields; |
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} |
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private function isMatchedValue($checkRequired, $value, $valueToMatch) |
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{ |
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if (!$checkRequired) { |
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return true; |
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} |
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return ($value == $valueToMatch); |
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} |
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public function getFields($resource) |
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{ |
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return $resource->schema(); |
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} |
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public function getRequiredFields($resource) |
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{ |
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return array_keys($this->filterFields($resource, 'required', true)); |
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} |
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public function getUniqueFields($resource) |
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{ |
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return array_merge( |
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array_keys($this->filterFields($resource, 'unique', true)), |
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$this->getNestedUniqueFieldNames($resource) |
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); |
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} |
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public function getSchemaFieldsWithDetails($resource) |
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{ |
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return $this->filterFields($resource, 'type', 'schema'); |
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} |
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private function getNestedUniqueFieldNames($resource) { |
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$result = []; |
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$schemaFields = $this->getSchemaFieldsWithDetails($resource); |
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array_walk($schemaFields, function($fieldDetails, $fieldName) use (&$result, &$resource) { |
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$nestedResourceClass = $fieldDetails['validator']['class']; |
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$nestedResource = property_exists($resource, $fieldName) |
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? $resource->{$fieldName} |
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: $nestedResourceClass::cast((object)[]); |
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$nestedUniqueFields = (new SchemaValidator($nestedResourceClass))->getUniqueFields($nestedResource); |
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array_walk($nestedUniqueFields, function($nestedFieldName) use (&$result, &$fieldName) { |
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$result[] = $fieldName . '.' . $nestedFieldName; |
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}); |
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}); |
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return $result; |
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} |
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public function getFieldsWithDefaults($resource) |
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{ |
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return $this->filterFields($resource, 'default', null, false); |
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} |
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} |
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fathomminds /
php-rest-models
