[Rule idea] Prevent injecting the ValidatorInterface in classes extending ConstraintValidator

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Issue 类型
功能
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基本清楚
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停滞
技术栈
php, symfony
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devtools

调研方向

No file or test is named. Start by locating the rule definitions and tests for classes implementing ConstraintValidatorInterface, then verify how constructor injection and #[Required] methods are represented; done means reporting ValidatorInterface injection in those classes without flagging other consumers.

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描述

Sometimes (for advanced cases), it is useful to execute validation of other constraints in the implementation of a ConstraintValidator.

The supported way of doing that in symfony/validator is to use $this->context->getValidator() (following the usage described in https://github.com/symfony/symfony/blob/v7.3.0/src/Symfony/Component/Validator/Context/ExecutionContextInterface.php#L21-L58).
When providing support on the Symfony Slack, I encountered a case where a dev has injected the ValidatorInterface in the constraint instead and uses that. This broke everything because the main validator (entrypoint of the component) is injecting its current execution context in all the registered constraint validator, which will impact the in-progress validation when starting a new one (constraint validators will not attach all their violations to the new execution context even when not expected).

A static analysis rule could prevent such mistake by detecting places where we inject the Symfony\Component\Validator\Validator\ValidatorInterface (either through the constructor or through a method that has the #[Required] attribute of symfony/service-contracts) in a class implementing Symfony\Component\Validator\ConstraintValidatorInterface.

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