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<?php
namespace Webmozart\Json;
use JsonSchema\Exception\InvalidArgumentException;
use JsonSchema\Validator;
class JsonValidator
{
private $metaSchema;
public function validate($data, $schema)
{
if (is_string($schema)) {
$schema = $this->loadSchema($schema);
} else {
$this->assertSchemaValid($schema);
}
$validator = new Validator();
try {
$validator->check($data, $schema);
} catch (InvalidArgumentException $e) {
throw new InvalidSchemaException(sprintf(
'The schema is invalid: %s',
$e->getMessage()
), 0, $e);
}
$errors = array();
if (!$validator->isValid()) {
$errors = (array) $validator->getErrors();
foreach ($errors as $key => $error) {
$prefix = $error['property'] ? $error['property'].': ' : '';
$errors[$key] = $prefix.$error['message'];
}
}
return $errors;
}
private function assertSchemaValid($schema)
{
if (null === $this->metaSchema) {
$this->metaSchema = json_decode(file_get_contents(__DIR__.'/../res/meta-schema.json'));
}
if ($schema === $this->metaSchema) {
return;
}
$errors = $this->validate($schema, $this->metaSchema);
if (count($errors) > 0) {
throw new InvalidSchemaException(sprintf(
"The schema is invalid:\n%s",
implode("\n", $errors)
));
}
if (!is_object($schema)) {
throw new InvalidSchemaException(sprintf(
'The schema must be an object. Got: %s',
$schema,
gettype($schema)
));
}
}
private function loadSchema($file)
{
if (!file_exists($file)) {
throw new InvalidSchemaException(sprintf(
'The schema file %s does not exist.',
$file
));
}
$schema = json_decode(file_get_contents($file));
try {
$this->assertSchemaValid($schema);
} catch (InvalidSchemaException $e) {
throw new InvalidSchemaException(sprintf(
'An error occurred while loading the schema %s: %s',
$file,
$e->getMessage()
), 0, $e);
}
return $schema;
}
}