Exemplo de CakePhp Behavior Buscar Cep

CepUtilBehavior.php

<?php
App::uses('ModelBehavior', 'Model');
/**
 * Created by PhpStorm.
 * User: Ederlo Rodrigo de Oliveira
 * Date: 16/12/15
 * Time: 09:23
 */
class CepUtilBehavior extends ModelBehavior
{
    /**
     * @var string
     */
    public $url = 'http://cep.correiocontrol.com.br';

    /**
     * @var string
     */
    public $url2 = 'https://viacep.com.br/ws';

    /**
     * @var string
     */
    public $type = 'json';

    /**
     * Setup this behavior with the specified configuration settings.
     *
     * @param Model $model Model using this behavior
     * @param array $config Configuration settings for $model
     * @return void
     */
    public function setup(Model $model, $config = array())
    {
        parent::setup($model, $config); // TODO: Change the autogenerated stub
    }

    /**
     * @param int $cep
     * @return mixed
     * @throws Exception
     */
    public function cep(Model $model, $cep = 0)
    {
        try{
            $cep = filter_var($cep, FILTER_SANITIZE_NUMBER_INT);
            $json = file_get_contents("{$this->url2}/{$cep}/{$this->type}");
            return json_decode($json, true);
        } catch (Exception $e){
            try{
                $cep = filter_var($cep, FILTER_SANITIZE_NUMBER_INT);
                $json = file_get_contents("{$this->url}/{$cep}.{$this->type}");
                return json_decode($json, true);
            } catch (Exception $e) {
                throw new Exception($e);
            }

        } catch (Exception $e){
            return json_decode(['json' => '']);
        }
    }
}