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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 Doctrine\Common\NotifyPropertyChanged;
use Doctrine\Common\PropertyChangedListener;
use Symfony\Component\Security\Acl\Model\AclInterface;
use Symfony\Component\Security\Acl\Model\AuditableAclInterface;
use Symfony\Component\Security\Acl\Model\EntryInterface;
use Symfony\Component\Security\Acl\Model\ObjectIdentityInterface;
use Symfony\Component\Security\Acl\Model\PermissionGrantingStrategyInterface;
use Symfony\Component\Security\Acl\Model\SecurityIdentityInterface;

/**
 * An ACL implementation.
 *
 * Each object identity has exactly one associated ACL. Each ACL can have four
 * different types of ACEs (class ACEs, object ACEs, class field ACEs, object field
 * ACEs).
 *
 * You should not iterate over the ACEs yourself, but instead use isGranted(),
 * or isFieldGranted(). These will utilize an implementation of PermissionGrantingStrategy
 * internally.
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class Acl implements AuditableAclInterface, NotifyPropertyChanged
{
    private $parentAcl;
    private $permissionGrantingStrategy;
    private $objectIdentity;
    private $classAces = array();
    private $classFieldAces = array();
    private $objectAces = array();
    private $objectFieldAces = array();
    private $id;
    private $loadedSids;
    private $entriesInheriting;
    private $listeners = array();

    /**
     * Constructor
     *
     * @param integer                             $id
     * @param ObjectIdentityInterface             $objectIdentity
     * @param PermissionGrantingStrategyInterface $permissionGrantingStrategy
     * @param array                               $loadedSids
     * @param Boolean                             $entriesInheriting
     */
    public function __construct($id, ObjectIdentityInterface $objectIdentity, PermissionGrantingStrategyInterface $permissionGrantingStrategy, array $loadedSids = array(), $entriesInheriting)
    {
        $this->id = $id;
        $this->objectIdentity = $objectIdentity;
        $this->permissionGrantingStrategy = $permissionGrantingStrategy;
        $this->loadedSids = $loadedSids;
        $this->entriesInheriting = $entriesInheriting;
    }

    /**
     * Adds a property changed listener
     *
     * @param PropertyChangedListener $listener
     */
    public function addPropertyChangedListener(PropertyChangedListener $listener)
    {
        $this->listeners[] = $listener;
    }

    /**
     * {@inheritDoc}
     */
    public function deleteClassAce($index)
    {
        $this->deleteAce('classAces', $index);
    }

    /**
     * {@inheritDoc}
     */
    public function deleteClassFieldAce($index, $field)
    {
        $this->deleteFieldAce('classFieldAces', $index, $field);
    }

    /**
     * {@inheritDoc}
     */
    public function deleteObjectAce($index)
    {
        $this->deleteAce('objectAces', $index);
    }

    /**
     * {@inheritDoc}
     */
    public function deleteObjectFieldAce($index, $field)
    {
        $this->deleteFieldAce('objectFieldAces', $index, $field);
    }

    /**
     * {@inheritDoc}
     */
    public function getClassAces()
    {
        return $this->classAces;
    }

    /**
     * {@inheritDoc}
     */
    public function getClassFieldAces($field)
    {
        return isset($this->classFieldAces[$field])? $this->classFieldAces[$field] : array();
    }

    /**
     * {@inheritDoc}
     */
    public function getObjectAces()
    {
        return $this->objectAces;
    }

    /**
     * {@inheritDoc}
     */
    public function getObjectFieldAces($field)
    {
        return isset($this->objectFieldAces[$field]) ? $this->objectFieldAces[$field] : array();
    }

    /**
     * {@inheritDoc}
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * {@inheritDoc}
     */
    public function getObjectIdentity()
    {
        return $this->objectIdentity;
    }

    /**
     * {@inheritDoc}
     */
    public function getParentAcl()
    {
        return $this->parentAcl;
    }

    /**
     * {@inheritDoc}
     */
    public function insertClassAce(SecurityIdentityInterface $sid, $mask, $index = 0, $granting = true, $strategy = null)
    {
        $this->insertAce('classAces', $index, $mask, $sid, $granting, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function insertClassFieldAce($field, SecurityIdentityInterface $sid, $mask, $index = 0, $granting = true, $strategy = null)
    {
        $this->insertFieldAce('classFieldAces', $index, $field, $mask, $sid, $granting, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function insertObjectAce(SecurityIdentityInterface $sid, $mask, $index = 0, $granting = true, $strategy = null)
    {
        $this->insertAce('objectAces', $index, $mask, $sid, $granting, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function insertObjectFieldAce($field, SecurityIdentityInterface $sid, $mask, $index = 0, $granting = true, $strategy = null)
    {
        $this->insertFieldAce('objectFieldAces', $index, $field, $mask, $sid, $granting, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function isEntriesInheriting()
    {
        return $this->entriesInheriting;
    }

    /**
     * {@inheritDoc}
     */
    public function isFieldGranted($field, array $masks, array $securityIdentities, $administrativeMode = false)
    {
        return $this->permissionGrantingStrategy->isFieldGranted($this, $field, $masks, $securityIdentities, $administrativeMode);
    }

    /**
     * {@inheritDoc}
     */
    public function isGranted(array $masks, array $securityIdentities, $administrativeMode = false)
    {
        return $this->permissionGrantingStrategy->isGranted($this, $masks, $securityIdentities, $administrativeMode);
    }

    /**
     * {@inheritDoc}
     */
    public function isSidLoaded($sids)
    {
        if (!$this->loadedSids) {
            return true;
        }

        if (!is_array($sids)) {
            $sids = array($sids);
        }

        foreach ($sids as $sid) {
            if (!$sid instanceof SecurityIdentityInterface) {
                throw new \InvalidArgumentException(
                    '$sid must be an instance of SecurityIdentityInterface.');
            }

            foreach ($this->loadedSids as $loadedSid) {
                if ($loadedSid->equals($sid)) {
                    continue 2;
                }
            }

            return false;
        }

        return true;
    }

    /**
     * Implementation for the \Serializable interface
     *
     * @return string
     */
    public function serialize()
    {
        return serialize(array(
            null === $this->parentAcl ? null : $this->parentAcl->getId(),
            $this->objectIdentity,
            $this->classAces,
            $this->classFieldAces,
            $this->objectAces,
            $this->objectFieldAces,
            $this->id,
            $this->loadedSids,
            $this->entriesInheriting,
        ));
    }

    /**
     * Implementation for the \Serializable interface
     *
     * @param string $serialized
     */
    public function unserialize($serialized)
    {
        list($this->parentAcl,
             $this->objectIdentity,
             $this->classAces,
             $this->classFieldAces,
             $this->objectAces,
             $this->objectFieldAces,
             $this->id,
             $this->loadedSids,
             $this->entriesInheriting
        ) = unserialize($serialized);

        $this->listeners = array();
    }

    /**
     * {@inheritDoc}
     */
    public function setEntriesInheriting($boolean)
    {
        if ($this->entriesInheriting !== $boolean) {
            $this->onPropertyChanged('entriesInheriting', $this->entriesInheriting, $boolean);
            $this->entriesInheriting = $boolean;
        }
    }

    /**
     * {@inheritDoc}
     */
    public function setParentAcl(AclInterface $acl = null)
    {
        if (null !== $acl && null === $acl->getId()) {
            throw new \InvalidArgumentException('$acl must have an ID.');
        }

        if ($this->parentAcl !== $acl) {
            $this->onPropertyChanged('parentAcl', $this->parentAcl, $acl);
            $this->parentAcl = $acl;
        }
    }

    /**
     * {@inheritDoc}
     */
    public function updateClassAce($index, $mask, $strategy = null)
    {
        $this->updateAce('classAces', $index, $mask, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function updateClassFieldAce($index, $field, $mask, $strategy = null)
    {
        $this->updateFieldAce('classFieldAces', $index, $field, $mask, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function updateObjectAce($index, $mask, $strategy = null)
    {
        $this->updateAce('objectAces', $index, $mask, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function updateObjectFieldAce($index, $field, $mask, $strategy = null)
    {
        $this->updateFieldAce('objectFieldAces', $index, $field, $mask, $strategy);
    }

    /**
     * {@inheritDoc}
     */
    public function updateClassAuditing($index, $auditSuccess, $auditFailure)
    {
        $this->updateAuditing($this->classAces, $index, $auditSuccess, $auditFailure);
    }

    /**
     * {@inheritDoc}
     */
    public function updateClassFieldAuditing($index, $field, $auditSuccess, $auditFailure)
    {
        if (!isset($this->classFieldAces[$field])) {
            throw new \InvalidArgumentException(sprintf('There are no ACEs for field "%s".', $field));
        }

        $this->updateAuditing($this->classFieldAces[$field], $index, $auditSuccess, $auditFailure);
    }

    /**
     * {@inheritDoc}
     */
    public function updateObjectAuditing($index, $auditSuccess, $auditFailure)
    {
        $this->updateAuditing($this->objectAces, $index, $auditSuccess, $auditFailure);
    }

    /**
     * {@inheritDoc}
     */
    public function updateObjectFieldAuditing($index, $field, $auditSuccess, $auditFailure)
    {
        if (!isset($this->objectFieldAces[$field])) {
            throw new \InvalidArgumentException(sprintf('There are no ACEs for field "%s".', $field));
        }

        $this->updateAuditing($this->objectFieldAces[$field], $index, $auditSuccess, $auditFailure);
    }

    /**
     * Deletes an ACE
     *
     * @param string  $property
     * @param integer $index
     * @throws \OutOfBoundsException
     */
    private function deleteAce($property, $index)
    {
        $aces =& $this->$property;
        if (!isset($aces[$index])) {
            throw new \OutOfBoundsException(sprintf('The index "%d" does not exist.', $index));
        }

        $oldValue = $this->$property;
        unset($aces[$index]);
        $this->$property = array_values($this->$property);
        $this->onPropertyChanged($property, $oldValue, $this->$property);

        for ($i=$index,$c=count($this->$property); $i<$c; $i++) {
            $this->onEntryPropertyChanged($aces[$i], 'aceOrder', $i+1, $i);
        }
    }

    /**
     * Deletes a field-based ACE
     *
     * @param string  $property
     * @param integer $index
     * @param string  $field
     * @throws \OutOfBoundsException
     */
    private function deleteFieldAce($property, $index, $field)
    {
        $aces =& $this->$property;
        if (!isset($aces[$field][$index])) {
            throw new \OutOfBoundsException(sprintf('The index "%d" does not exist.', $index));
        }

        $oldValue = $this->$property;
        unset($aces[$field][$index]);
        $aces[$field] = array_values($aces[$field]);
        $this->onPropertyChanged($property, $oldValue, $this->$property);

        for ($i=$index,$c=count($aces[$field]); $i<$c; $i++) {
            $this->onEntryPropertyChanged($aces[$field][$i], 'aceOrder', $i+1, $i);
        }
    }

    /**
     * Inserts an ACE
     *
     * @param string                    $property
     * @param integer                   $index
     * @param integer                   $mask
     * @param SecurityIdentityInterface $sid
     * @param Boolean                   $granting
     * @param string                    $strategy
     * @throws \OutOfBoundsException
     * @throws \InvalidArgumentException
     */
    private function insertAce($property, $index, $mask, SecurityIdentityInterface $sid, $granting, $strategy = null)
    {
        if ($index < 0 || $index > count($this->$property)) {
            throw new \OutOfBoundsException(sprintf('The index must be in the interval [0, %d].', count($this->$property)));
        }

        if (!is_int($mask)) {
            throw new \InvalidArgumentException('$mask must be an integer.');
        }

        if (null === $strategy) {
            if (true === $granting) {
                $strategy = PermissionGrantingStrategy::ALL;
            } else {
                $strategy = PermissionGrantingStrategy::ANY;
            }
        }

        $aces =& $this->$property;
        $oldValue = $this->$property;
        if (isset($aces[$index])) {
            $this->$property = array_merge(
                array_slice($this->$property, 0, $index),
                array(true),
                array_slice($this->$property, $index)
            );

            for ($i=$index,$c=count($this->$property)-1; $i<$c; $i++) {
                $this->onEntryPropertyChanged($aces[$i+1], 'aceOrder', $i, $i+1);
            }
        }

        $aces[$index] = new Entry(null, $this, $sid, $strategy, $mask, $granting, false, false);
        $this->onPropertyChanged($property, $oldValue, $this->$property);
    }

    /**
     * Inserts a field-based ACE
     *
     * @param string                    $property
     * @param integer                   $index
     * @param string                    $field
     * @param integer                   $mask
     * @param SecurityIdentityInterface $sid
     * @param Boolean                   $granting
     * @param string                    $strategy
     * @throws \InvalidArgumentException
     * @throws \OutOfBoundsException
     */
    private function insertFieldAce($property, $index, $field, $mask, SecurityIdentityInterface $sid, $granting, $strategy = null)
    {
        if (0 === strlen($field)) {
            throw new \InvalidArgumentException('$field cannot be empty.');
        }

        if (!is_int($mask)) {
            throw new \InvalidArgumentException('$mask must be an integer.');
        }

        if (null === $strategy) {
            if (true === $granting) {
                $strategy = PermissionGrantingStrategy::ALL;
            } else {
                $strategy = PermissionGrantingStrategy::ANY;
            }
        }

        $aces =& $this->$property;
        if (!isset($aces[$field])) {
            $aces[$field] = array();
        }

        if ($index < 0 || $index > count($aces[$field])) {
            throw new \OutOfBoundsException(sprintf('The index must be in the interval [0, %d].', count($this->$property)));
        }

        $oldValue = $aces;
        if (isset($aces[$field][$index])) {
            $aces[$field] = array_merge(
                array_slice($aces[$field], 0, $index),
                array(true),
                array_slice($aces[$field], $index)
            );

            for ($i=$index,$c=count($aces[$field])-1; $i<$c; $i++) {
                $this->onEntryPropertyChanged($aces[$field][$i+1], 'aceOrder', $i, $i+1);
            }
        }

        $aces[$field][$index] = new FieldEntry(null, $this, $field, $sid, $strategy, $mask, $granting, false, false);
        $this->onPropertyChanged($property, $oldValue, $this->$property);
    }

    /**
     * Updates an ACE
     *
     * @param string  $property
     * @param integer $index
     * @param integer $mask
     * @param string  $strategy
     * @throws \OutOfBoundsException
     */
    private function updateAce($property, $index, $mask, $strategy = null)
    {
        $aces =& $this->$property;
        if (!isset($aces[$index])) {
            throw new \OutOfBoundsException(sprintf('The index "%d" does not exist.', $index));
        }

        $ace = $aces[$index];
        if ($mask !== $oldMask = $ace->getMask()) {
            $this->onEntryPropertyChanged($ace, 'mask', $oldMask, $mask);
            $ace->setMask($mask);
        }
        if (null !== $strategy && $strategy !== $oldStrategy = $ace->getStrategy()) {
            $this->onEntryPropertyChanged($ace, 'strategy', $oldStrategy, $strategy);
            $ace->setStrategy($strategy);
        }
    }

    /**
     * Updates auditing for an ACE
     *
     * @param array   &$aces
     * @param integer $index
     * @param Boolean $auditSuccess
     * @param Boolean $auditFailure
     * @throws \OutOfBoundsException
     */
    private function updateAuditing(array &$aces, $index, $auditSuccess, $auditFailure)
    {
        if (!isset($aces[$index])) {
            throw new \OutOfBoundsException(sprintf('The index "%d" does not exist.', $index));
        }

        if ($auditSuccess !== $aces[$index]->isAuditSuccess()) {
            $this->onEntryPropertyChanged($aces[$index], 'auditSuccess', !$auditSuccess, $auditSuccess);
            $aces[$index]->setAuditSuccess($auditSuccess);
        }

        if ($auditFailure !== $aces[$index]->isAuditFailure()) {
            $this->onEntryPropertyChanged($aces[$index], 'auditFailure', !$auditFailure, $auditFailure);
            $aces[$index]->setAuditFailure($auditFailure);
        }
    }

    /**
     * Updates a field-based ACE
     *
     * @param string  $property
     * @param integer $index
     * @param string  $field
     * @param integer $mask
     * @param string  $strategy
     * @throws \InvalidArgumentException
     * @throws \OutOfBoundsException
     */
    private function updateFieldAce($property, $index, $field, $mask, $strategy = null)
    {
        if (0 === strlen($field)) {
            throw new \InvalidArgumentException('$field cannot be empty.');
        }

        $aces =& $this->$property;
        if (!isset($aces[$field][$index])) {
            throw new \OutOfBoundsException(sprintf('The index "%d" does not exist.', $index));
        }

        $ace = $aces[$field][$index];
        if ($mask !== $oldMask = $ace->getMask()) {
            $this->onEntryPropertyChanged($ace, 'mask', $oldMask, $mask);
            $ace->setMask($mask);
        }
        if (null !== $strategy && $strategy !== $oldStrategy = $ace->getStrategy()) {
            $this->onEntryPropertyChanged($ace, 'strategy', $oldStrategy, $strategy);
            $ace->setStrategy($strategy);
        }
    }

    /**
     * Called when a property of the ACL changes
     *
     * @param string $name
     * @param mixed  $oldValue
     * @param mixed  $newValue
     */
    private function onPropertyChanged($name, $oldValue, $newValue)
    {
        foreach ($this->listeners as $listener) {
            $listener->propertyChanged($this, $name, $oldValue, $newValue);
        }
    }

    /**
     * Called when a property of an ACE associated with this ACL changes
     *
     * @param EntryInterface $entry
     * @param string         $name
     * @param mixed          $oldValue
     * @param mixed          $newValue
     */
    private function onEntryPropertyChanged(EntryInterface $entry, $name, $oldValue, $newValue)
    {
        foreach ($this->listeners as $listener) {
            $listener->propertyChanged($entry, $name, $oldValue, $newValue);
        }
    }
}