Validation in / not in breaks with values ending in backslash

[vkwbpo]

Laravel Version

10.29.0

PHP Version

8.2.14

Database Driver & Version

No response

Description

In and NotIn validation rules do not work correctly for values ending in backslash.

Steps To Reproduce

Execute the following tinker commands:

Validator::make(['a' => 'b\\'], ['a' => Illuminate\Validation\Rule::notIn('b\\')])->passes();
Validator::make(['a' => 'b\\c'], ['a' => Illuminate\Validation\Rule::notIn('b\\c')])->passes();

First validator passes, seconds fails as expected. First should fail too.

[github-actions]

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If possible, please make a pull request fixing the issue you have described, along with corresponding tests. All pull requests are promptly reviewed by the Laravel team.

Thank you!

[Katalam]

The Validator uses the function str_getcsv($parameter) inside the validation cycle to hydrate the Validation Rules based on a string. In your example not_in:"b\" the problem is, that the function str_getcsv uses \" as an escape and enclose character. So the value the parser will output will be b\" and that is not b\ so the validation passes. I don't really have an idea on how to fix this

But the probleme is here:

framework/src/Illuminate/Validation/ValidationRuleParser.php

Line 283 in fc453b9

return static::ruleIsRegex($rule) ? [$parameter] : str_getcsv($parameter);

[PaperTurtle]

This might not be a pretty or perfect solution, but it seems to work.

protected static function parseParameters($rule, $parameter)
{
    return array_map(function ($param) { return str_replace('\\\\', '\\', $param); },
        static::ruleIsRegex($rule) ? [$parameter] : str_getcsv(str_replace('\\', '\\\\', $parameter), ',', '"', "\\")
    );
}

I don't know if there are any security concerns or if this might cause bugs for other cases. But it passes the tests

[driesvints]

Looks like for now, we're not going to support this, sorry.