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<?php
declare(strict_types=1);
namespace Laminas\Permissions\Acl\Assertion;
use Laminas\Permissions\Acl\Acl;
use Laminas\Permissions\Acl\Assertion\Exception\InvalidAssertionException;
use Laminas\Permissions\Acl\Exception\RuntimeException;
use Laminas\Permissions\Acl\Resource\ResourceInterface;
use Laminas\Permissions\Acl\Role\RoleInterface;
use ReflectionProperty;
use function array_flip;
use function array_intersect_key;
use function assert;
use function count;
use function explode;
use function in_array;
use function is_array;
use function is_object;
use function is_string;
use function method_exists;
use function preg_match;
use function property_exists;
use function sprintf;
use function str_contains;
use function str_replace;
use function strtolower;
use function ucwords;
/**
* Create an assertion based on expression rules.
*
* Each of the constructor, fromProperties, and fromArray methods allow you to
* define expression rules, and these include the left hand side, operator, and
* right hand side of the expression.
*
* The left and right hand sides of the expression are the values to compare.
* These values can be either an exact value to match, or an array with the key
* OPERAND_CONTEXT_PROPERTY pointing to one of two value types.
*
* First, it can be a string value matching one of "acl", "privilege", "role",
* or "resource", with the latter two values being the most common. In those
* cases, the matching value passed to `assert()` will be used in the
* comparison.
*
* Second, it can be a dot-separated property path string of the format
* "object.property", representing the associated object (role, resource, acl,
* or privilege) and its property to test against. The property may refer to a
* public property, or a public `get` or `is` method (following
* canonicalization of the property by replacing underscore separated values
* with camelCase values).
*/
final class ExpressionAssertion implements AssertionInterface
{
public const OPERAND_CONTEXT_PROPERTY = '__context';
public const OPERATOR_EQ = '=';
public const OPERATOR_NEQ = '!=';
public const OPERATOR_LT = '<';
public const OPERATOR_LTE = '<=';
public const OPERATOR_GT = '>';
public const OPERATOR_GTE = '>=';
public const OPERATOR_IN = 'in';
public const OPERATOR_NIN = '!in';
public const OPERATOR_REGEX = 'regex';
public const OPERATOR_NREGEX = '!regex';
public const OPERATOR_SAME = '===';
public const OPERATOR_NSAME = '!==';
/** @var list<string> */
private static array $validOperators = [
self::OPERATOR_EQ,
self::OPERATOR_NEQ,
self::OPERATOR_LT,
self::OPERATOR_LTE,
self::OPERATOR_GT,
self::OPERATOR_GTE,
self::OPERATOR_IN,
self::OPERATOR_NIN,
self::OPERATOR_REGEX,
self::OPERATOR_NREGEX,
self::OPERATOR_SAME,
self::OPERATOR_NSAME,
];
/**
* Constructor
*
* Note that the constructor is marked private; use `fromProperties()` or
* `fromArray()` to create an instance.
*
* @param mixed|array $left See the class description for valid values.
* @param string $operator One of the OPERATOR constants (or their values)
* @param mixed|array $right See the class description for valid values.
*/
private function __construct(private $left, private $operator, private $right)
{
}
/**
* @param mixed|array $left See the class description for valid values.
* @param string $operator One of the OPERATOR constants (or their values)
* @param mixed|array $right See the class description for valid values.
* @return self
* @throws InvalidAssertionException If either operand is invalid.
* @throws InvalidAssertionException If the operator is not supported.
*/
public static function fromProperties($left, $operator, $right)
{
$operator = strtolower($operator);
self::validateOperand($left);
self::validateOperator($operator);
self::validateOperand($right);
return new self($left, $operator, $right);
}
/**
* @param array $expression Must contain the following keys:
* - left: the left-hand side of the expression
* - operator: the operator to use for the comparison
* - right: the right-hand side of the expression
* See the class description for valid values for the left and right
* hand side values.
* @return self
* @throws InvalidAssertionException If missing one of the required keys.
* @throws InvalidAssertionException If either operand is invalid.
* @throws InvalidAssertionException If the operator is not supported.
*/
public static function fromArray(array $expression)
{
$required = ['left', 'operator', 'right'];
if (count(array_intersect_key($expression, array_flip($required))) < count($required)) {
throw new InvalidAssertionException(
"Expression assertion requires 'left', 'operator' and 'right' to be supplied"
);
}
return self::fromProperties(
$expression['left'],
$expression['operator'],
$expression['right']
);
}
/**
* @param mixed|array $operand
* @throws InvalidAssertionException If the operand is invalid.
*/
private static function validateOperand($operand)
{
if (is_array($operand) && isset($operand[self::OPERAND_CONTEXT_PROPERTY])) {
if (! is_string($operand[self::OPERAND_CONTEXT_PROPERTY])) {
throw new InvalidAssertionException('Expression assertion context operand must be string');
}
}
}
/**
* @param string $operator
* @throws InvalidAssertionException If the operator is not supported.
*/
private static function validateOperator($operator)
{
if (! in_array($operator, self::$validOperators, true)) {
throw new InvalidAssertionException('Provided expression assertion operator is not supported');
}
}
/**
* {@inheritDoc}
*/
public function assert(
Acl $acl,
?RoleInterface $role = null,
?ResourceInterface $resource = null,
$privilege = null
) {
return $this->evaluate([
'acl' => $acl,
'role' => $role,
'resource' => $resource,
'privilege' => $privilege,
]);
}
/**
* @param array $context Contains the acl, privilege, role, and resource
* being tested currently.
* @return bool
*/
private function evaluate(array $context)
{
$left = $this->getLeftValue($context);
$right = $this->getRightValue($context);
return static::evaluateExpression($left, $this->operator, $right);
}
/**
* @param array $context Contains the acl, privilege, role, and resource
* being tested currently.
* @return mixed
*/
private function getLeftValue(array $context)
{
return $this->resolveOperandValue($this->left, $context);
}
/**
* @param array $context Contains the acl, privilege, role, and resource
* being tested currently.
* @return mixed
*/
private function getRightValue(array $context)
{
return $this->resolveOperandValue($this->right, $context);
}
/**
* @param mixed|array $operand
* @param array $context Contains the acl, privilege, role, and resource
* being tested currently.
* @return mixed
* @throws RuntimeException If object cannot be resolved in context.
* @throws RuntimeException If property cannot be resolved.
*/
private function resolveOperandValue($operand, array $context)
{
if (! is_array($operand) || ! isset($operand[self::OPERAND_CONTEXT_PROPERTY])) {
return $operand;
}
$contextProperty = $operand[self::OPERAND_CONTEXT_PROPERTY];
assert(is_string($contextProperty));
if (str_contains($contextProperty, '.')) { // property path?
$parts = explode('.', $contextProperty, 2);
assert(count($parts) >= 2);
[$objectName, $objectField] = $parts;
return $this->getObjectFieldValue($context, $objectName, $objectField);
}
if (! isset($context[$contextProperty])) {
throw new RuntimeException(sprintf(
"'%s' is not available in the assertion context",
$contextProperty
));
}
return $context[$contextProperty];
}
/**
* @param array $context Contains the acl, privilege, role, and resource
* being tested currently.
* @param string $objectName Name of object in context to use.
* @param string $field
* @return mixed
* @throws RuntimeException If object cannot be resolved in context.
* @throws RuntimeException If property cannot be resolved.
*/
private function getObjectFieldValue(array $context, $objectName, $field)
{
if (! isset($context[$objectName])) {
throw new RuntimeException(sprintf(
"'%s' is not available in the assertion context",
$objectName
));
}
$object = $context[$objectName];
$accessors = ['get', 'is'];
$fieldAccessor = ! str_contains($field, '_')
? $field
: str_replace(' ', '', ucwords(str_replace('_', ' ', $field)));
foreach ($accessors as $accessor) {
$accessor .= $fieldAccessor;
if (is_object($object) && method_exists($object, $accessor)) {
return $object->$accessor();
}
}
if (! is_object($object) || ! $this->propertyExists($object, $field)) {
throw new RuntimeException(sprintf(
"'%s' property cannot be resolved on the '%s' object",
$field,
$objectName
));
}
return $object->$field;
}
/**
* @param string $operator
* @return bool|void
* @throws RuntimeException If operand is not supported.
*/
private static function evaluateExpression(mixed $left, $operator, mixed $right)
{
// phpcs:disable SlevomatCodingStandard.Operators.DisallowEqualOperators
switch ($operator) {
case self::OPERATOR_EQ:
return $left == $right;
case self::OPERATOR_NEQ:
return $left != $right;
case self::OPERATOR_LT:
return $left < $right;
case self::OPERATOR_LTE:
return $left <= $right;
case self::OPERATOR_GT:
return $left > $right;
case self::OPERATOR_GTE:
return $left >= $right;
case self::OPERATOR_IN:
return in_array($left, $right);
case self::OPERATOR_NIN:
return ! in_array($left, $right);
case self::OPERATOR_REGEX:
return (bool) preg_match($right, $left);
case self::OPERATOR_NREGEX:
return ! (bool) preg_match($right, $left);
case self::OPERATOR_SAME:
return $left === $right;
case self::OPERATOR_NSAME:
return $left !== $right;
}
// phpcs:enable SlevomatCodingStandard.Operators.DisallowEqualOperators
}
/**
* @param object $object
* @param string $property
* @return bool
*/
private function propertyExists($object, $property)
{
if (! property_exists($object, $property)) {
return false;
}
$r = new ReflectionProperty($object, $property);
return $r->isPublic();
}
}