PHP code example of azaharizaman / nexus-policy-engine

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

azaharizaman / nexus-policy-engine example snippets

declare(strict_types=1);

use Nexus\PolicyEngine\Domain\Condition;
use Nexus\PolicyEngine\Domain\ConditionGroup;
use Nexus\PolicyEngine\Domain\PolicyDefinition;
use Nexus\PolicyEngine\Domain\PolicyRequest;
use Nexus\PolicyEngine\Domain\RuleDefinition;
use Nexus\PolicyEngine\Enums\ConditionOperator;
use Nexus\PolicyEngine\Enums\DecisionOutcome;
use Nexus\PolicyEngine\Enums\EvaluationStrategy;
use Nexus\PolicyEngine\Enums\PolicyKind;
use Nexus\PolicyEngine\Services\InMemoryPolicyRegistry;
use Nexus\PolicyEngine\Services\PolicyEvaluator;
use Nexus\PolicyEngine\Services\PolicyValidator;
use Nexus\PolicyEngine\ValueObjects\PolicyId;
use Nexus\PolicyEngine\ValueObjects\PolicyVersion;
use Nexus\PolicyEngine\ValueObjects\ReasonCode;
use Nexus\PolicyEngine\ValueObjects\RuleId;
use Nexus\PolicyEngine\ValueObjects\TenantId;

$registry = new InMemoryPolicyRegistry();
$validator = new PolicyValidator();
$engine = new PolicyEvaluator($registry, $validator);

$policy = new PolicyDefinition(
    new PolicyId('auth.rfq.approve'),
    new PolicyVersion('v1'),
    new TenantId('tenant_a'),
    PolicyKind::Authorization,
    EvaluationStrategy::CollectAll,
    [
        new RuleDefinition(
            new RuleId('allow.buyer'),
            100,
            DecisionOutcome::Allow,
            new ConditionGroup('all', [
                new Condition('role', ConditionOperator::Equals, 'buyer'),
            ]),
            new ReasonCode('role.allowed')
        ),
        new RuleDefinition(
            new RuleId('deny.suspended'),
            90,
            DecisionOutcome::Deny,
            new ConditionGroup('all', [
                new Condition('is_suspended', ConditionOperator::Equals, true),
            ]),
            new ReasonCode('account.suspended')
        ),
    ]
);

$registry->put($policy);

$decision = $engine->evaluate(new PolicyRequest(
    new TenantId('tenant_a'),
    new PolicyId('auth.rfq.approve'),
    new PolicyVersion('v1'),
    'approve',
    ['role' => 'buyer', 'is_suspended' => false]
));

// $decision->outcome === DecisionOutcome::Allow

$decision = $engine->evaluate(new PolicyRequest(
    new TenantId('tenant_a'),
    new PolicyId('workflow.rfq.review'),
    new PolicyVersion('v1'),
    'submit',
    [],
    [],
    ['risk_level' => 'high', 'amount' => 250000]
));

// Example expected outcome:
// DecisionOutcome::Escalate

$thresholdRule = new RuleDefinition(
    new RuleId('escalate.high.value'),
    200,
    DecisionOutcome::Escalate,
    new ConditionGroup('all', [
        new Condition('amount', ConditionOperator::GreaterThan, 100000),
    ]),
    new ReasonCode('threshold.exceeded')
);

use Nexus\PolicyEngine\Services\JsonPolicyDecoder;

$decoder = new JsonPolicyDecoder(new PolicyValidator());
$definition = $decoder->decode($jsonPayload);

// $definition is a validated PolicyDefinition ready for registry/evaluation.