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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 Yiisoft\Validator\Exception\UnexpectedRuleException; |
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use Yiisoft\Validator\Formatter; |
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use Yiisoft\Validator\FormatterInterface; |
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use Yiisoft\Validator\Result; |
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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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final class JsonHandler implements RuleHandlerInterface |
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{ |
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private FormatterInterface $formatter; |
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public function __construct(?FormatterInterface $formatter = null) |
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{ |
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$this->formatter = $formatter ?? new Formatter(); |
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} |
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public function validate(mixed $value, object $rule, ?ValidationContext $context = null): Result |
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{ |
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if (!$rule instanceof Json) { |
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throw new UnexpectedRuleException(Json::class, $rule); |
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} |
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$result = new Result(); |
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if (!$this->isValidJson($value)) { |
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$formattedMessage = $this->formatter->format( |
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$rule->getMessage(), |
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['attribute' => $context?->getAttribute(), 'value' => $value] |
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); |
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$result->addError($formattedMessage); |
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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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} |
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yiisoft /
validator
