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<?php declare(strict_types=1); |
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namespace jschreuder\MiddleAuth\Abac; |
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use jschreuder\MiddleAuth\AuthorizationEntityInterface; |
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use Closure; |
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use InvalidArgumentException; |
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use ReflectionFunction; |
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use ReflectionParameter; |
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final class ClosureBasedAccessEvaluator implements AccessEvaluatorInterface |
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{ |
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private Closure $evaluator; |
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public function __construct(callable $evaluator) |
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{ |
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$this->evaluator = Closure::fromCallable($evaluator); |
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$this->validateSignature(); |
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} |
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public function hasAccess(AuthorizationEntityInterface $actor, AuthorizationEntityInterface $resource, string $action, array $context): bool |
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{ |
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return ($this->evaluator)($actor, $resource, $action, $context); |
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} |
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private function validateSignature(): void |
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{ |
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$reflection = new ReflectionFunction($this->evaluator); |
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$parameters = $reflection->getParameters(); |
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if (count($parameters) !== 4) { |
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throw new InvalidArgumentException( |
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'AccessEvaluator must accept exactly 4 parameters (AuthorizationEntityInterface, AuthorizationEntityInterface, string, array)' |
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); |
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} |
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// If we have 4 parameters, validate their types if type hints are present |
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$this->checkType($parameters[0], 1, AuthorizationEntityInterface::class); |
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$this->checkType($parameters[1], 2, AuthorizationEntityInterface::class); |
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$this->checkType($parameters[2], 3, 'string'); |
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$this->checkType($parameters[3], 4, 'array'); |
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} |
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private function checkType(ReflectionParameter $parameter, int $number, string $type) |
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{ |
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if (!$parameter->hasType() || strval($parameter->getType()) !== $type) { |
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throw new InvalidArgumentException('Parameter '.$number.' must be '.$type); |
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} |
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} |
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} |
jschreuder /
MiddleAuth
