func sendLoginRequest(userName:String,password:String){
        let parameters = ["username":userName,
                          "password":password,
                          "client_id": clientID,
                          "client_secret": clientSecret,
                          "grant_type":"password"]
        HUD.show(.progress)
        let api = RCValues.sharedInstance.string(forKey: .apiDocToCloud)
        Alamofire.request(api+"auth-social/token/", method: .post, parameters: parameters).responseJSON { (response) in
            HUD.hide()
            if response.result.error == nil{
                debugPrint(response.result.value!)
                let responseJSON = response.result.value as! [String:AnyObject]
                if let refreshToken = responseJSON["refresh_token"] as? String{
                    self.saveRefreshToken(token: refreshToken)
                }
                if let token = responseJSON["access_token"] as? String{
                    self.saveTokenOnLoginSucceed(token)
                }else{
                    let alert = UIAlertController(title: nil, message: "Login ou senha inválidos.", preferredStyle: .alert)
                    let action = UIAlertAction(title: "OK", style: .cancel, handler: nil)
                    alert.addAction(action)
                    self.present(alert, animated: true, completion: nil)
                }
            }else{
                self.showErrorAlertView()
                debugPrint(response.result.error as Any)
            }
        }
    }