init
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emmymayo
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<?php
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/**
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* The check model class.
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*
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* @package WCPay\Fraud_Prevention\Models
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*/
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namespace WCPay\Fraud_Prevention\Models;
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use WCPay\Exceptions\Fraud_Ruleset_Exception;
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/**
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* Check model.
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*/
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class Check {
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// Check operators.
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const OPERATOR_EQUALS = 'equals';
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const OPERATOR_NOT_EQUALS = 'not_equals';
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const OPERATOR_GTE = 'greater_or_equal';
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const OPERATOR_GT = 'greater_than';
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const OPERATOR_LTE = 'less_or_equal';
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const OPERATOR_LT = 'less_than';
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const OPERATOR_IN = 'in';
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const OPERATOR_NOT_IN = 'not_in';
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// Checklist operators.
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const LIST_OPERATOR_AND = 'and';
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const LIST_OPERATOR_OR = 'or';
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/**
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* List of check operators.
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*
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* @var array
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*/
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private static $check_operators = [
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self::OPERATOR_EQUALS,
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self::OPERATOR_NOT_EQUALS,
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self::OPERATOR_GT,
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self::OPERATOR_GTE,
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self::OPERATOR_LT,
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self::OPERATOR_LTE,
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self::OPERATOR_IN,
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self::OPERATOR_NOT_IN,
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];
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/**
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* List of checklist operators.
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*
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* @var array
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*/
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private static $list_operators = [
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self::LIST_OPERATOR_AND,
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self::LIST_OPERATOR_OR,
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];
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/**
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* Operator for the Check.
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*
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* @var string
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*/
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public $operator = null;
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/**
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* The key of the source which contains the data. Is mapped to a real data to compare with the value on the Fraud_Ruleset_Service.
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*
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* @var string
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*/
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public $key = null;
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/**
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* Value to check against the source.
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*
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* @var mixed
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*/
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public $value = null;
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/**
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* Subchecks array that when filled, indicates this is a checklist.
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*
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* @var array
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*/
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public $checks = [];
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/**
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* Creates a Check instance from an array.
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*
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* @param array $array The Check configuration.
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*
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* @return Check
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* @throws Fraud_Ruleset_Exception When the array validation fails.
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*/
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public static function from_array( array $array ): Check {
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// Check if this is a valid candidate for a rule. Rules should have keys, outcomes, and checks defined and not empty.
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if ( ! self::validate_array( $array ) ) {
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throw new Fraud_Ruleset_Exception( 'Check definition not valid.' );
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}
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$check = new self();
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$check->key = $array['key'] ?? null;
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$check->operator = $array['operator'];
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$check->value = $array['value'] ?? null;
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if ( isset( $array['checks'] ) ) {
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foreach ( $array['checks'] as $check_definition ) {
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$check->checks[] = self::from_array( $check_definition );
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}
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}
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return $check;
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}
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/**
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* Validates the given array if it's structured to become a Check object.
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*
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* @param array $array The array to validate.
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*
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* @return bool Whether it is a valid Check array.
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*/
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public static function validate_array( array $array ): bool {
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// Check if this array contains an operator. In all cases it should have an operator field.
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if ( ! isset( $array['operator'] ) ) {
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return false;
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}
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if ( in_array( $array['operator'], self::$list_operators, true ) ) {
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// This should be a checklist, and should have checks.
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if ( ! isset( $array['checks'] ) || empty( $array['checks'] ) ) {
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return false;
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}
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// Validate child checks.
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foreach ( $array['checks'] as $check ) {
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if ( ! self::validate_array( $check ) ) {
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return false;
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}
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}
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} elseif ( in_array( $array['operator'], self::$check_operators, true ) ) {
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// This should be a single check, and should have key and value.
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if ( ! isset( $array['value'] ) ) {
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return false;
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}
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if ( ! isset( $array['key'] ) ) {
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return false;
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}
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} else {
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return false;
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}
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return true;
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}
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/**
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* Creates a list type of check with the given parameters.
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*
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* @param string $operator The checklist operator.
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* @param array $checks The child checks array.
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*
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* @return Check
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* @throws Fraud_Ruleset_Exception When the validation fails.
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*/
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public static function list( string $operator, array $checks ) {
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if ( ! in_array( $operator, self::$list_operators, true ) ) {
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// $operator is a predefined constant, no need to escape.
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// phpcs:ignore WordPress.Security.EscapeOutput
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throw new Fraud_Ruleset_Exception( 'Operator for the check is invalid: ' . $operator );
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}
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if ( 0 < count(
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array_filter(
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$checks,
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function ( $check ) {
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return ! ( $check instanceof Check ); }
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)
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) ) {
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throw new Fraud_Ruleset_Exception( 'The checklist checks should only contain Check objects.' );
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}
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$checklist = new Check();
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$checklist->operator = $operator;
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$checklist->checks = $checks;
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return $checklist;
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}
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/**
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* Creates a list type of check with the given parameters.
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*
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* @param string $key The key of the check.
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* @param string $operator The check operator.
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* @param mixed $value The value to compare against.
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*
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* @return Check
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* @throws Fraud_Ruleset_Exception When the validation fails.
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*/
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public static function check( string $key, string $operator, $value ) {
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if ( ! in_array( $operator, self::$check_operators, true ) ) {
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// $operator is a predefined constant, no need to escape.
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// phpcs:ignore WordPress.Security.EscapeOutput
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throw new Fraud_Ruleset_Exception( 'Operator for the check is invalid: ' . $operator );
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}
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$check = new Check();
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$check->operator = $operator;
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$check->key = $key;
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$check->value = $value;
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return $check;
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}
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/**
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* Converts the class to it's array representation for transmission.
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*
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* @return array
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*/
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public function to_array() {
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if ( ! empty( $this->checks ) ) {
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return [
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'operator' => $this->operator,
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'checks' => array_map(
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function ( Check $check ) {
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return $check->to_array();
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},
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$this->checks
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),
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];
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}
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return [
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'key' => $this->key,
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'operator' => $this->operator,
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'value' => $this->value,
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];
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}
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}
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