package client
 
 import (
 	"encoding/json"
 	"net/http"
 	"net/url"
 
 	"github.com/docker/docker/api/types"

 	"github.com/docker/docker/api/types/registry"

 	"golang.org/x/net/context"
 )
 
 // RegistryLogin authenticates the docker server with a given docker registry.

 // It returns unauthorizedError when the authentication fails.

 func (cli *Client) RegistryLogin(ctx context.Context, auth types.AuthConfig) (registry.AuthenticateOKBody, error) {

 	resp, err := cli.post(ctx, "/auth", url.Values{}, auth, nil)
 
 	if resp.statusCode == http.StatusUnauthorized {

 		return registry.AuthenticateOKBody{}, unauthorizedError{err}

 	}
 	if err != nil {

 		return registry.AuthenticateOKBody{}, err

 	}
 

 	var response registry.AuthenticateOKBody

 	err = json.NewDecoder(resp.body).Decode(&response)
 	ensureReaderClosed(resp)
 	return response, err
 }