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<?php |
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/* |
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* This file is part of the Webmozart JSON package. |
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* |
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* (c) Bernhard Schussek <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Webmozart\Json; |
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use JsonSchema\Exception\InvalidArgumentException; |
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use JsonSchema\Validator; |
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/** |
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* Validates decoded JSON values against a JSON schema. |
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* |
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* This class is a wrapper for {@link Validator} that adds exceptions and |
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* validation of schema files. A few edge cases that are not handled by |
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* {@link Validator} are handled by this class. |
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* |
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* @since 1.0 |
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* |
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* @author Bernhard Schussek <[email protected]> |
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*/ |
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class JsonValidator |
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{ |
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/** |
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* The schema used for validating schemas. |
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* |
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* @var object|null |
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*/ |
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private $metaSchema; |
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/** |
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* Callable creating new Validator instances. |
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* |
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* @var callable |
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*/ |
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private $validatorFactory; |
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/** |
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* JsonValidator constructor. |
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* |
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* @param callable|null $validatorFactory Factory creating JsonSchema\Validator instances. |
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*/ |
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public function __construct($validatorFactory = null) |
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{ |
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if (null === $validatorFactory) { |
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$validatorFactory = function () { |
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return new Validator(); |
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}; |
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}; |
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if (!is_callable($validatorFactory)) { |
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throw new UnexpectedTypeException($validatorFactory, 'null or callable'); |
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} |
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$this->validatorFactory = $validatorFactory; |
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} |
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/** |
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* Validates JSON data against a schema. |
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* |
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* The schema may be passed as file path or as object returned from |
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* `json_decode($schemaFile)`. |
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* |
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* @param mixed $data The decoded JSON data. |
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* @param string|object $schema The schema file or object. |
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* |
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* @return string[] The errors found during validation. Returns an empty |
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* array if no errors were found. |
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* |
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* @throws InvalidSchemaException If the schema is invalid. |
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*/ |
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public function validate($data, $schema) |
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{ |
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if (is_string($schema)) { |
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$schema = $this->loadSchema($schema); |
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} else { |
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$this->assertSchemaValid($schema); |
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} |
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$validator = $this->createValidator(); |
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try { |
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$validator->check($data, $schema); |
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} catch (InvalidArgumentException $e) { |
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throw new InvalidSchemaException(sprintf( |
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'The schema is invalid: %s', |
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$e->getMessage() |
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), 0, $e); |
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} |
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$errors = array(); |
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if (!$validator->isValid()) { |
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$errors = (array) $validator->getErrors(); |
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foreach ($errors as $key => $error) { |
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$prefix = $error['property'] ? $error['property'].': ' : ''; |
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$errors[$key] = $prefix.$error['message']; |
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} |
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} |
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return $errors; |
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} |
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private function assertSchemaValid($schema) |
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{ |
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if (null === $this->metaSchema) { |
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// The meta schema is obviously not validated. If we |
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// validate it against itself, we have an endless recursion |
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$this->metaSchema = json_decode(file_get_contents(__DIR__.'/../res/meta-schema.json')); |
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} |
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if ($schema === $this->metaSchema) { |
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return; |
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} |
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$errors = $this->validate($schema, $this->metaSchema); |
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if (count($errors) > 0) { |
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throw new InvalidSchemaException(sprintf( |
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"The schema is invalid:\n%s", |
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implode("\n", $errors) |
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)); |
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} |
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// not caught by justinrainbow/json-schema |
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if (!is_object($schema)) { |
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throw new InvalidSchemaException(sprintf( |
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'The schema must be an object. Got: %s', |
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$schema, |
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gettype($schema) |
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)); |
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} |
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} |
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private function loadSchema($file) |
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{ |
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if (!file_exists($file)) { |
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throw new InvalidSchemaException(sprintf( |
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'The schema file %s does not exist.', |
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$file |
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)); |
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} |
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$schema = json_decode(file_get_contents($file)); |
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try { |
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$this->assertSchemaValid($schema); |
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} catch (InvalidSchemaException $e) { |
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throw new InvalidSchemaException(sprintf( |
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'An error occurred while loading the schema %s: %s', |
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$file, |
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$e->getMessage() |
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), 0, $e); |
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} |
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return $schema; |
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} |
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/** |
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* @return Validator |
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*/ |
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private function createValidator() |
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{ |
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$validator = call_user_func($this->validatorFactory); |
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if (!$validator instanceof Validator) { |
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throw new UnexpectedTypeException($validator, 'JsonSchema\Validator'); |
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} |
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return $validator; |
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} |
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} |
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webmozart /
json
