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Filename : PermissionGrantingStrategy.php
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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Security\Acl\Domain;

use Symfony\Component\Security\Acl\Exception\NoAceFoundException;
use Symfony\Component\Security\Acl\Model\AclInterface;
use Symfony\Component\Security\Acl\Model\AuditLoggerInterface;
use Symfony\Component\Security\Acl\Model\EntryInterface;
use Symfony\Component\Security\Acl\Model\PermissionGrantingStrategyInterface;
use Symfony\Component\Security\Acl\Model\SecurityIdentityInterface;

/**
 * The permission granting strategy to apply to the access control list.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class PermissionGrantingStrategy implements PermissionGrantingStrategyInterface
{
    const EQUAL = 'equal';
    const ALL   = 'all';
    const ANY   = 'any';

    private $auditLogger;

    /**
     * Sets the audit logger
     *
     * @param AuditLoggerInterface $auditLogger
     */
    public function setAuditLogger(AuditLoggerInterface $auditLogger)
    {
        $this->auditLogger = $auditLogger;
    }

    /**
     * {@inheritDoc}
     */
    public function isGranted(AclInterface $acl, array $masks, array $sids, $administrativeMode = false)
    {
        try {
            try {
                $aces = $acl->getObjectAces();

                if (!$aces) {
                    throw new NoAceFoundException();
                }

                return $this->hasSufficientPermissions($acl, $aces, $masks, $sids, $administrativeMode);
            } catch (NoAceFoundException $noObjectAce) {
                $aces = $acl->getClassAces();

                if (!$aces) {
                    throw $noObjectAce;
                }

                return $this->hasSufficientPermissions($acl, $aces, $masks, $sids, $administrativeMode);
            }
        } catch (NoAceFoundException $noClassAce) {
            if ($acl->isEntriesInheriting() && null !== $parentAcl = $acl->getParentAcl()) {
                return $parentAcl->isGranted($masks, $sids, $administrativeMode);
            }

            throw $noClassAce;
        }
    }

    /**
     * {@inheritDoc}
     */
    public function isFieldGranted(AclInterface $acl, $field, array $masks, array $sids, $administrativeMode = false)
    {
        try {
            try {
                $aces = $acl->getObjectFieldAces($field);
                if (!$aces) {
                    throw new NoAceFoundException();
                }

                return $this->hasSufficientPermissions($acl, $aces, $masks, $sids, $administrativeMode);
            } catch (NoAceFoundException $noObjectAces) {
                $aces = $acl->getClassFieldAces($field);
                if (!$aces) {
                    throw $noObjectAces;
                }

                return $this->hasSufficientPermissions($acl, $aces, $masks, $sids, $administrativeMode);
            }
        } catch (NoAceFoundException $noClassAces) {
            if ($acl->isEntriesInheriting() && null !== $parentAcl = $acl->getParentAcl()) {
                return $parentAcl->isFieldGranted($field, $masks, $sids, $administrativeMode);
            }

            throw $noClassAces;
        }
    }

    /**
     * Makes an authorization decision.
     *
     * The order of ACEs, and SIDs is significant; the order of permission masks
     * not so much. It is important to note that the more specific security
     * identities should be at the beginning of the SIDs array in order for this
     * strategy to produce intuitive authorization decisions.
     *
     * First, we will iterate over permissions, then over security identities.
     * For each combination of permission, and identity we will test the
     * available ACEs until we find one which is applicable.
     *
     * The first applicable ACE will make the ultimate decision for the
     * permission/identity combination. If it is granting, this method will return
     * true, if it is denying, the method will continue to check the next
     * permission/identity combination.
     *
     * This process is repeated until either a granting ACE is found, or no
     * permission/identity combinations are left. Finally, we will either throw
     * an NoAceFoundException, or deny access.
     *
     * @param AclInterface                $acl
     * @param EntryInterface[]            $aces               An array of ACE to check against
     * @param array                       $masks              An array of permission masks
     * @param SecurityIdentityInterface[] $sids               An array of SecurityIdentityInterface implementations
     * @param Boolean                     $administrativeMode True turns off audit logging
     *
     * @return Boolean true, or false; either granting, or denying access respectively.
     *
     * @throws NoAceFoundException
     */
    private function hasSufficientPermissions(AclInterface $acl, array $aces, array $masks, array $sids, $administrativeMode)
    {
        $firstRejectedAce  = null;

        foreach ($masks as $requiredMask) {
            foreach ($sids as $sid) {
                foreach ($aces as $ace) {
                    if ($sid->equals($ace->getSecurityIdentity()) && $this->isAceApplicable($requiredMask, $ace)) {
                        if ($ace->isGranting()) {
                            if (!$administrativeMode && null !== $this->auditLogger) {
                                $this->auditLogger->logIfNeeded(true, $ace);
                            }

                            return true;
                        }

                        if (null === $firstRejectedAce) {
                            $firstRejectedAce = $ace;
                        }

                        break 2;
                    }
                }
            }
        }

        if (null !== $firstRejectedAce) {
            if (!$administrativeMode && null !== $this->auditLogger) {
                $this->auditLogger->logIfNeeded(false, $firstRejectedAce);
            }

            return false;
        }

        throw new NoAceFoundException();
    }

    /**
     * Determines whether the ACE is applicable to the given permission/security
     * identity combination.
     *
     * Per default, we support three different comparison strategies.
     *
     * Strategy ALL:
     * The ACE will be considered applicable when all the turned-on bits in the
     * required mask are also turned-on in the ACE mask.
     *
     * Strategy ANY:
     * The ACE will be considered applicable when any of the turned-on bits in
     * the required mask is also turned-on the in the ACE mask.
     *
     * Strategy EQUAL:
     * The ACE will be considered applicable when the bitmasks are equal.
     *
     * @param integer        $requiredMask
     * @param EntryInterface $ace
     *
     * @return Boolean
     *
     * @throws \RuntimeException if the ACE strategy is not supported
     */
    private function isAceApplicable($requiredMask, EntryInterface $ace)
    {
        $strategy = $ace->getStrategy();
        if (self::ALL === $strategy) {
            return $requiredMask === ($ace->getMask() & $requiredMask);
        } elseif (self::ANY === $strategy) {
            return 0 !== ($ace->getMask() & $requiredMask);
        } elseif (self::EQUAL === $strategy) {
            return $requiredMask === $ace->getMask();
        }

        throw new \RuntimeException(sprintf('The strategy "%s" is not supported.', $strategy));
    }
}