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258
vendor/symfony/validator/Constraints/UuidValidator.php
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258
vendor/symfony/validator/Constraints/UuidValidator.php
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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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 Symfony\Component\Validator\Constraints;
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use Symfony\Component\Validator\Constraint;
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use Symfony\Component\Validator\ConstraintValidator;
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use Symfony\Component\Validator\Exception\UnexpectedTypeException;
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use Symfony\Component\Validator\Exception\UnexpectedValueException;
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/**
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* Validates whether the value is a valid UUID (also known as GUID).
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*
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* Strict validation will allow a UUID as specified per RFC 4122.
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* Loose validation will allow any type of UUID.
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*
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* @author Colin O'Dell <colinodell@gmail.com>
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* @author Bernhard Schussek <bschussek@gmail.com>
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*
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* @see http://tools.ietf.org/html/rfc4122
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* @see https://en.wikipedia.org/wiki/Universally_unique_identifier
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*/
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class UuidValidator extends ConstraintValidator
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{
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// The strict pattern matches UUIDs like this:
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// xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx
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// Roughly speaking:
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// x = any hexadecimal character
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// M = any allowed version {1..6}
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// N = any allowed variant {8, 9, a, b}
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public const STRICT_LENGTH = 36;
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public const STRICT_FIRST_HYPHEN_POSITION = 8;
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public const STRICT_LAST_HYPHEN_POSITION = 23;
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public const STRICT_VERSION_POSITION = 14;
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public const STRICT_VARIANT_POSITION = 19;
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// The loose pattern validates similar yet non-compliant UUIDs.
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// Hyphens are completely optional. If present, they should only appear
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// between every fourth character:
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// xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx
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// xxxxxxxxxxxx-xxxx-xxxx-xxxx-xxxx-xxxx
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// xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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// The value can also be wrapped with characters like []{}:
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// {xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx}
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// Neither the version nor the variant is validated by this pattern.
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public const LOOSE_MAX_LENGTH = 39;
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public const LOOSE_FIRST_HYPHEN_POSITION = 4;
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/**
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* {@inheritdoc}
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*/
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public function validate($value, Constraint $constraint)
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{
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if (!$constraint instanceof Uuid) {
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throw new UnexpectedTypeException($constraint, Uuid::class);
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}
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if (null === $value || '' === $value) {
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return;
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}
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if (!is_scalar($value) && !(\is_object($value) && method_exists($value, '__toString'))) {
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throw new UnexpectedValueException($value, 'string');
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}
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$value = (string) $value;
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if (null !== $constraint->normalizer) {
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$value = ($constraint->normalizer)($value);
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}
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if ($constraint->strict) {
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$this->validateStrict($value, $constraint);
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return;
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}
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$this->validateLoose($value, $constraint);
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}
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private function validateLoose(string $value, Uuid $constraint)
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{
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// Error priority:
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// 1. ERROR_INVALID_CHARACTERS
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// 2. ERROR_INVALID_HYPHEN_PLACEMENT
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// 3. ERROR_TOO_SHORT/ERROR_TOO_LONG
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// Trim any wrapping characters like [] or {} used by some legacy systems
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$trimmed = trim($value, '[]{}');
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// Position of the next expected hyphen
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$h = self::LOOSE_FIRST_HYPHEN_POSITION;
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// Expected length
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$l = self::LOOSE_MAX_LENGTH;
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for ($i = 0; $i < $l; ++$i) {
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// Check length
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if (!isset($trimmed[$i])) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::TOO_SHORT_ERROR)
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->addViolation();
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return;
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}
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// Hyphens must occur every fifth position
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// xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxx
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// ^ ^ ^ ^ ^ ^ ^
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if ('-' === $trimmed[$i]) {
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if ($i !== $h) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::INVALID_HYPHEN_PLACEMENT_ERROR)
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->addViolation();
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return;
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}
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$h += 5;
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continue;
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}
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// Missing hyphens are ignored
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if ($i === $h) {
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$h += 4;
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--$l;
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}
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// Check characters
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if (!ctype_xdigit($trimmed[$i])) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::INVALID_CHARACTERS_ERROR)
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->addViolation();
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return;
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}
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}
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// Check length again
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if (isset($trimmed[$i])) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::TOO_LONG_ERROR)
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->addViolation();
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}
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}
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private function validateStrict(string $value, Uuid $constraint)
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{
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// Error priority:
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// 1. ERROR_INVALID_CHARACTERS
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// 2. ERROR_INVALID_HYPHEN_PLACEMENT
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// 3. ERROR_TOO_SHORT/ERROR_TOO_LONG
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// 4. ERROR_INVALID_VERSION
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// 5. ERROR_INVALID_VARIANT
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// Position of the next expected hyphen
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$h = self::STRICT_FIRST_HYPHEN_POSITION;
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for ($i = 0; $i < self::STRICT_LENGTH; ++$i) {
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// Check length
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if (!isset($value[$i])) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::TOO_SHORT_ERROR)
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->addViolation();
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return;
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}
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// Check hyphen placement
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// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
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// ^ ^ ^ ^
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if ('-' === $value[$i]) {
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if ($i !== $h) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::INVALID_HYPHEN_PLACEMENT_ERROR)
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->addViolation();
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return;
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}
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// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
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// ^
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if ($h < self::STRICT_LAST_HYPHEN_POSITION) {
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$h += 5;
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}
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continue;
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}
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// Check characters
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if (!ctype_xdigit($value[$i])) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::INVALID_CHARACTERS_ERROR)
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->addViolation();
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return;
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}
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// Missing hyphen
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if ($i === $h) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::INVALID_HYPHEN_PLACEMENT_ERROR)
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->addViolation();
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return;
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}
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}
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// Check length again
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if (isset($value[$i])) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::TOO_LONG_ERROR)
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->addViolation();
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}
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// Check version
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if (!\in_array($value[self::STRICT_VERSION_POSITION], $constraint->versions)) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::INVALID_VERSION_ERROR)
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->addViolation();
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}
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// Check variant - first two bits must equal "10"
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// 0b10xx
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// & 0b1100 (12)
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// = 0b1000 (8)
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if (8 !== (hexdec($value[self::STRICT_VARIANT_POSITION]) & 12)) {
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$this->context->buildViolation($constraint->message)
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->setParameter('{{ value }}', $this->formatValue($value))
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->setCode(Uuid::INVALID_VARIANT_ERROR)
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->addViolation();
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}
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}
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}
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