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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Validator\Rule; |
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use Attribute; |
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use Yiisoft\Validator\FormatterInterface; |
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use Yiisoft\Validator\Result; |
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use Yiisoft\Validator\Rule; |
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use Yiisoft\Validator\ValidationContext; |
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use function is_string; |
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/** |
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* Validates that the value is a valid json. |
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*/ |
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#[Attribute(Attribute::TARGET_PROPERTY)] |
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final class Json extends Rule |
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{ |
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public function __construct( |
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private string $message = 'The value is not JSON.', |
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?FormatterInterface $formatter = null, |
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bool $skipOnEmpty = false, |
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bool $skipOnError = false, |
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$when = null, |
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) { |
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parent::__construct(formatter: $formatter, skipOnEmpty: $skipOnEmpty, skipOnError: $skipOnError, when: $when); |
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} |
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protected function validateValue($value, ?ValidationContext $context = null): Result |
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{ |
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$result = new Result(); |
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if (!$this->isValidJson($value)) { |
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$result->addError($this->formatMessage($this->message)); |
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} |
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return $result; |
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} |
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private function isValidJson($value): bool |
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{ |
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// Regular expression is built based on JSON grammar specified at |
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// https://tools.ietf.org/html/rfc8259 |
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$regex = <<<'REGEX' |
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/ |
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(?(DEFINE) |
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(?<json>(?>\s*(?&object)\s*|\s*(?&array)\s*)) |
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(?<object>(?>\{\s*(?>(?&member)(?>\s*,\s*(?&member))*)?\s*\})) |
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(?<member>(?>(?&string)\s*:\s*(?&value))) |
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(?<array>(?>\[\s*(?>(?&value)(?>\s*,\s*(?&value))*)?\s*\])) |
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(?<value>(?>)false|null|true|(?&object)|(?&array)|(?&number)|(?&string)) |
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(?<number>(?>-?(?>0|[1-9]\d*)(?>\.\d+)?(?>[eE][-+]?\d+)?)) |
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(?<string>(?>"(?>\\(?>["\\\/bfnrt]|u[a-fA-F0-9]{4})|[^"\\\0-\x1F\x7F]+)*")) |
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) |
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\A(?&json)\z |
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/x |
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REGEX; |
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return is_string($value) && preg_match($regex, $value) === 1; |
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} |
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public function getOptions(): array |
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{ |
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return array_merge(parent::getOptions(), [ |
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'message' => $this->formatMessage($this->message), |
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]); |
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} |
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} |
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yiisoft /
validator
