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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2009 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Access;

\defined('JPATH_PLATFORM') or die;

/**
 * Rule class.
 *
 * @since  2.5.0
 */
class Rule
{
	/**
	 * A named array
	 *
	 * @var    array
	 * @since  1.7.0
	 */
	protected $data = array();

/**
	 * Constructor.
	 *
	 * The input array must be in the form: array(-42 => true, 3 => true, 4 => false)
	 * or an equivalent JSON encoded string.
	 *
	 * @param   mixed  $identities  A JSON format string (probably from the database) or a named array.
	 *
	 * @since   1.7.0
	 */
	public function __construct($identities)
	{
		// Convert string input to an array.
		if (\is_string($identities))
		{
			$identities = json_decode($identities, true);
		}

$this->mergeIdentities($identities);
	}

/**
	 * Get the data for the action.
	 *
	 * @return  array  A named array
	 *
	 * @since   1.7.0
	 */
	public function getData()
	{
		return $this->data;
	}

/**
	 * Merges the identities
	 *
	 * @param   mixed  $identities  An integer or array of integers representing the identities to check.
	 *
	 * @return  void
	 *
	 * @since   1.7.0
	 */
	public function mergeIdentities($identities)
	{
		if ($identities instanceof Rule)
		{
			$identities = $identities->getData();
		}

if (\is_array($identities))
		{
			foreach ($identities as $identity => $allow)
			{
				$this->mergeIdentity($identity, $allow);
			}
		}
	}

/**
	 * Merges the values for an identity.
	 *
	 * @param   integer  $identity  The identity.
	 * @param   boolean  $allow     The value for the identity (true == allow, false == deny).
	 *
	 * @return  void
	 *
	 * @since   1.7.0
	 */
	public function mergeIdentity($identity, $allow)
	{
		$identity = (int) $identity;
		$allow = (int) ((boolean) $allow);

// Check that the identity exists.
		if (isset($this->data[$identity]))
		{
			// Explicit deny always wins a merge.
			if ($this->data[$identity] !== 0)
			{
				$this->data[$identity] = $allow;
			}
		}
		else
		{
			$this->data[$identity] = $allow;
		}
	}

/**
	 * Checks that this action can be performed by an identity.
	 *
	 * The identity is an integer where +ve represents a user group,
	 * and -ve represents a user.
	 *
	 * @param   mixed  $identities  An integer or array of integers representing the identities to check.
	 *
	 * @return  mixed  True if allowed, false for an explicit deny, null for an implicit deny.
	 *
	 * @since   1.7.0
	 */
	public function allow($identities)
	{
		// Implicit deny by default.
		$result = null;

// Check that the inputs are valid.
		if (!empty($identities))
		{
			if (!\is_array($identities))
			{
				$identities = array($identities);
			}

foreach ($identities as $identity)
			{
				// Technically the identity just needs to be unique.
				$identity = (int) $identity;

// Check if the identity is known.
				if (isset($this->data[$identity]))
				{
					$result = (boolean) $this->data[$identity];

// An explicit deny wins.
					if ($result === false)
					{
						break;
					}
				}
			}
		}

return $result;
	}

/**
	 * Convert this object into a JSON encoded string.
	 *
	 * @return  string  JSON encoded string
	 *
	 * @since   1.7.0
	 */
	public function __toString()
	{
		return json_encode($this->data);
	}
}

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Name	Size	Perms	Modified	Actions
Exception DIR	-	drwxr-xr-x	2021-08-23 19:07:08	Edit Download recursive recursive
Access.php	33.59 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
Rule.php	3.33 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive
Rules.php	4.31 KB	lrw-r--r--	2021-08-23 19:07:08	Edit Download recursive recursive

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