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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\Exception\ResourceNotFoundException; |
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use JsonSchema\RefResolver; |
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use JsonSchema\Uri\UriRetriever; |
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use JsonSchema\Validator; |
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use Webmozart\PathUtil\Path; |
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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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* Validator instance used for validation. |
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* |
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* @var Validator |
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*/ |
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private $validator; |
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/** |
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* URI retriever for fetching JSON schemas. |
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* |
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* @var UriRetriever |
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*/ |
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private $uriRetriever; |
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/** |
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* JsonValidator constructor. |
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* |
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* @param Validator|null $validator JsonSchema\Validator instance to use. |
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*/ |
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public function __construct(Validator $validator = null, UriRetriever $uriRetriever = null) |
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{ |
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$this->validator = $validator ?: new Validator(); |
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$this->uriRetriever = $uriRetriever ?: new UriRetriever(); |
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} |
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/** |
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* Validates JSON data against a schema. |
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* |
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* The schema may be passed as file path or as object returned from |
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* `json_decode($schemaFile)`. |
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* |
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* @param mixed $data The decoded JSON data. |
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* @param string|object|null $schema The schema file or object. If `null`, |
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* the validator will look for a `$schema` |
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* property. |
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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 = null) |
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{ |
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if (null === $schema && isset($data->{'$schema'})) { |
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$schema = $data->{'$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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} elseif (is_object($schema)) { |
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$this->assertSchemaValid($schema); |
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} else { |
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throw new InvalidSchemaException(sprintf( |
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'The schema must be given as string, object or in the "$schema" '. |
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'property of the JSON data. Got: %s', |
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is_object($schema) ? get_class($schema) : gettype($schema) |
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)); |
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} |
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$this->validator->reset(); |
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try { |
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$this->validator->check($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 (!$this->validator->isValid()) { |
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$errors = (array) $this->validator->getErrors(); |
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foreach ($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", $errors) |
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)); |
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} |
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} |
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private function loadSchema($file) |
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{ |
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// Retrieve schema and cache in UriRetriever |
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$file = Path::canonicalize($file); |
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// Add file:// scheme if necessary |
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if (false === strpos($file, '://')) { |
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$file = 'file://'.$file; |
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} |
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try { |
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$schema = $this->uriRetriever->retrieve($file); |
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} catch (ResourceNotFoundException $e) { |
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throw new InvalidSchemaException(sprintf( |
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'The schema %s does not exist.', |
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$file |
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), 0, $e); |
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} |
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// Resolve references to other schemas |
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$resolver = new RefResolver($this->uriRetriever); |
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$resolver->resolve($schema, $file); |
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try { |
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$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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webmozart /
json
