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Filename : MaskBuilder.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\Permission;

/**
 * This class allows you to build cumulative permissions easily, or convert
 * masks to a human-readable format.
 *
 * <code>
 *       $builder = new MaskBuilder();
 *       $builder
 *           ->add('view')
 *           ->add('create')
 *           ->add('edit')
 *       ;
 *       var_dump($builder->get());        // int(7)
 *       var_dump($builder->getPattern()); // string(32) ".............................ECV"
 * </code>
 *
 * We have defined some commonly used base permissions which you can use:
 * - VIEW: the SID is allowed to view the domain object / field
 * - CREATE: the SID is allowed to create new instances of the domain object / fields
 * - EDIT: the SID is allowed to edit existing instances of the domain object / field
 * - DELETE: the SID is allowed to delete domain objects
 * - UNDELETE: the SID is allowed to recover domain objects from trash
 * - OPERATOR: the SID is allowed to perform any action on the domain object
 *             except for granting others permissions
 * - MASTER: the SID is allowed to perform any action on the domain object,
 *           and is allowed to grant other SIDs any permission except for
 *           MASTER and OWNER permissions
 * - OWNER: the SID is owning the domain object in question and can perform any
 *          action on the domain object as well as grant any permission
 *
 * @author Johannes M. Schmitt <schmittjoh@gmail.com>
 */
class MaskBuilder
{
    const MASK_VIEW         = 1;          // 1 << 0
    const MASK_CREATE       = 2;          // 1 << 1
    const MASK_EDIT         = 4;          // 1 << 2
    const MASK_DELETE       = 8;          // 1 << 3
    const MASK_UNDELETE     = 16;         // 1 << 4
    const MASK_OPERATOR     = 32;         // 1 << 5
    const MASK_MASTER       = 64;         // 1 << 6
    const MASK_OWNER        = 128;        // 1 << 7
    const MASK_IDDQD        = 1073741823; // 1 << 0 | 1 << 1 | ... | 1 << 30

    const CODE_VIEW         = 'V';
    const CODE_CREATE       = 'C';
    const CODE_EDIT         = 'E';
    const CODE_DELETE       = 'D';
    const CODE_UNDELETE     = 'U';
    const CODE_OPERATOR     = 'O';
    const CODE_MASTER       = 'M';
    const CODE_OWNER        = 'N';

    const ALL_OFF           = '................................';
    const OFF               = '.';
    const ON                = '*';

    private $mask;

    /**
     * Constructor
     *
     * @param integer $mask optional; defaults to 0
     *
     * @throws \InvalidArgumentException
     */
    public function __construct($mask = 0)
    {
        if (!is_int($mask)) {
            throw new \InvalidArgumentException('$mask must be an integer.');
        }

        $this->mask = $mask;
    }

    /**
     * Adds a mask to the permission
     *
     * @param mixed $mask
     *
     * @return MaskBuilder
     *
     * @throws \InvalidArgumentException
     */
    public function add($mask)
    {
        if (is_string($mask) && defined($name = 'static::MASK_'.strtoupper($mask))) {
            $mask = constant($name);
        } elseif (!is_int($mask)) {
            throw new \InvalidArgumentException('$mask must be an integer.');
        }

        $this->mask |= $mask;

        return $this;
    }

    /**
     * Returns the mask of this permission
     *
     * @return integer
     */
    public function get()
    {
        return $this->mask;
    }

    /**
     * Returns a human-readable representation of the permission
     *
     * @return string
     */
    public function getPattern()
    {
        $pattern = self::ALL_OFF;
        $length = strlen($pattern);
        $bitmask = str_pad(decbin($this->mask), $length, '0', STR_PAD_LEFT);

        for ($i=$length-1; $i>=0; $i--) {
            if ('1' === $bitmask[$i]) {
                try {
                    $pattern[$i] = self::getCode(1 << ($length - $i - 1));
                } catch (\Exception $notPredefined) {
                    $pattern[$i] = self::ON;
                }
            }
        }

        return $pattern;
    }

    /**
     * Removes a mask from the permission
     *
     * @param mixed $mask
     *
     * @return MaskBuilder
     *
     * @throws \InvalidArgumentException
     */
    public function remove($mask)
    {
        if (is_string($mask) && defined($name = 'static::MASK_'.strtoupper($mask))) {
            $mask = constant($name);
        } elseif (!is_int($mask)) {
            throw new \InvalidArgumentException('$mask must be an integer.');
        }

        $this->mask &= ~$mask;

        return $this;
    }

    /**
     * Resets the PermissionBuilder
     *
     * @return MaskBuilder
     */
    public function reset()
    {
        $this->mask = 0;

        return $this;
    }

    /**
     * Returns the code for the passed mask
     *
     * @param integer $mask
     * @throws \InvalidArgumentException
     * @throws \RuntimeException
     * @return string
     */
    public static function getCode($mask)
    {
        if (!is_int($mask)) {
            throw new \InvalidArgumentException('$mask must be an integer.');
        }

        $reflection = new \ReflectionClass(get_called_class());
        foreach ($reflection->getConstants() as $name => $cMask) {
            if (0 !== strpos($name, 'MASK_')) {
                continue;
            }

            if ($mask === $cMask) {
                if (!defined($cName = 'static::CODE_'.substr($name, 5))) {
                    throw new \RuntimeException('There was no code defined for this mask.');
                }

                return constant($cName);
            }
        }

        throw new \InvalidArgumentException(sprintf('The mask "%d" is not supported.', $mask));
    }
}