Uploading files in cakephp

image_uploader.php

<?php 

/*
 * Exmplo de uso no model
 *
 *   var $actsAs = array(
 *       'ImagemUpload' => array(
 *           'width' => 550,
 *           'height' => 356,
 *           'thumb' => true,
 *           'thumb_width' => 189,
 *           'thumb_height' => 130
 *       )
 *   );
*/

class ImagemUploadBehavior extends ModelBehavior {

    var $settings = array(); 
    
    function setup(&$Model, $settings = array()){
        
        $pasta = Inflector::tableize($Model->alias);
         
        if(!isset($this->settings[$Model->alias])) {
            $this->settings[$Model->alias] = array(
                'dir' => WWW_ROOT . 'files/' . $pasta
            );
        }               
    
        $this->settings[$Model->alias] = array_merge($this->settings[$Model->alias], $settings);
    }
    
    
    function beforeValidate(&$Model){

        if(empty($Model->data[$Model->alias]['imagem']['name'])){
            $Model->data[$Model->alias]['imagem'] = null;
        }
        
        return true;
    }

     
    function beforeSave(&$Model){
       
        if(!empty($Model->data[$Model->alias]['imagem']['name'])){
            
            App::Import('Lib', 'Upload');
            $handle = new upload($Model->data[$Model->alias]['imagem']);
            
            $table = Inflector::tableize($Model->alias);
            
            $filename = $this->nome($Model);
                 
            $handle->file_new_name_body = $filename; 
            $handle->image_resize = true;
            $handle->image_ratio_crop = true;
            $handle->image_x = $this->settings[$Model->alias]['width'];
            $handle->image_y = $this->settings[$Model->alias]['height']; 
            
            $handle->process(WWW_ROOT . 'files/' . $table);
            if($handle->processed){
                $Model->data[$Model->alias]['imagem'] = $filename . '.' . $handle->file_dst_name_ext;
            }else{
                echo 'Imagem principal - '.$handle->error;
                exit;
            }
            
            if(!isset($Model->data[$Model->alias]['created'])){
                $this->excluir($Model);
            }

            if($this->settings[$Model->alias]['thumb']){
                
                $filename_thumb = 'thb_'.$filename;
                     
                $handle->file_new_name_body = $filename_thumb; 
                $handle->image_resize = true;
                $handle->image_ratio_crop = true;
                $handle->image_y = $this->settings[$Model->alias]['thumb_height']; 
                $handle->image_x = $this->settings[$Model->alias]['thumb_width'];
                
                $handle->process(WWW_ROOT . 'files/' . $table);
                $upThumbImg = $handle->processed;
                if($handle->processed){
                    $handle->Clean();
                    return true; 
                }else{
                    echo $handle->error;
                    exit;
                }
            
            }else{
                return true;
            }
            
        }else{
            unset($Model->data[$Model->alias]['imagem']);
            return true;
        }
    }
    

    function beforeDelete(&$Model){
        
        return $this->excluir($Model);
    }

    function nome(&$Model, $thumb = false){
        
        $nome = time();
        return $nome; 
    }

    function excluir(&$Model){
        
        extract($this->settings[$Model->alias]);
        
        $filename = $Model->field('imagem'); 

        if(!empty($filename)){

            if(!unlink($dir . '/' . $filename)){
                return false;
            }
            
            if($thumb){
                
                if(unlink($dir . '/thb_' . $filename)){
                    return true;
                }else{
                    return false;
                }
            }else{
                return true;
            }
        }

    }    
     
}