Selective validation behavior

SelectiveValidationBehavior.php

<?php
/**
 * Selective validation behavior
 *
 * @copyright ADmad
 * @link https://github.com/ADmad
 * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
 */

class SelectiveValidationBehavior extends ModelBehavior {

/**
 * Backup of orignal model validations
 *
 * @var array
 */
	protected $_defaultValidation = array();

/**
 * Eg. structure for $config array where array keys 'action_name1', 'action_name2'
 * are controller action names.
 * array(
 *   'action_name1' => array(
 *   	'merge' => true,  // See docblock of useRulesSet() for all possible values
 *   	'rules' => array(
 *   		//rules in same format as $validate array
 *   	)
 *   )
 *   'action_name2' => array(
 *   	'merge' => 'reverse',  // See docblock of useRulesSet() for all possible values
 *   	'rules' => 'arrayNameContainingRules'
 *   )
 * )
 *
 * @param Model $Model Model object
 * @param array $config Config array
 */
	public function setup($Model, $config = array()) {
		$this->_defaultValidation[$Model->alias] = $Model->validate;

		if (!empty($config)) {
			$this->settings[$Model->alias] = $config;
		} else {
			$this->settings[$Model->alias] = array();
		}
	}

/**
 * Switch validation rules
 *
 * @param Model $Model Model object
 * @return boolean
 */
	public function beforeValidate($Model) {
		if (isset($this->settings[$Model->alias][Router::getParam('action')])) {
			$actionSettings = $this->settings[$Model->alias][Router::getParam('action')];
			if (isset($actionSettings['merge']) && $actionSettings['merge']) {
				if ($actionSettings['merge'] === true) {
					if (is_string($actionSettings['rules'])) {
						$Model->validate = array_merge($Model->validate, $Model->{$actionSettings['rules']});
					} else {
						$Model->validate = array_merge($Model->validate, $actionSettings['rules']);
					}
				} else {
					if (is_string($actionSettings['rules'])) {
						$Model->validate = array_merge($Model->{$actionSettings['rules']}, $Model->validate);
					} else {
						$Model->validate = array_merge($actionSettings['rules'], $Model->validate);
					}
				}
			} else {
				if (is_string($actionSettings['rules'])) {
					$Model->validate = $Model->{$actionSettings['rules']};
				} else {
					$Model->validate = $actionSettings['rules'];
				}
			}
		}

		return true;
	}

/**
 * Set the rules set to use for validation
 *
 * @param Model $Model Model object
 * @param string $rulesSetName Name to the model property containing validation rules
 * @param mixed $merge Merging scheme. Possible values are:
 * 	`'forward'|true` : Merge new rules after existing rules (field name keys from new rules overwrite older ones)
 * 	`'reverse'` : Merge new rules before existing rules (field name keys from old rules overwrite new ones)
 * 	`false`	: Overwrite existings rules, no merging
 * @return void
 */
	public function useRulesSet($Model, $rulesSetName, $merge = true) {
		if ($merge) {
			if ($merge === true || $merge === 'forward') {
				$Model->validate = array_merge($Model->validate, $Model->{$rulesSetName});
			} else {
				$Model->validate = array_merge($Model->{$rulesSetName}, $Model->validate);
			}
		} else {
			$Model->validate = $Model->{$rulesSetName};
		}
	}

/**
 * Reset rules set to model's original Model::$validate
 *
 * @param Model $Model Model object
 * @return void
 */
	public function resetRulesSet($Model) {
		$Model->validate = $this->_defaultValidation[$Model->alias];
	}

}