Add support for identity token with token handler

Use token handler options for initialization.
Update auth endpoint to set identity token in response.
Update credential store to match distribution interface changes.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

docs/auth.go

@@ -15,11 +15,16 @@ import (
 	registrytypes "github.com/docker/engine-api/types/registry"
 )
 
+const (
+	// AuthClientID is used the ClientID used for the token server
+	AuthClientID = "docker"
+)
+
 // loginV1 tries to register/login to the v1 registry server.
-func loginV1(authConfig *types.AuthConfig, apiEndpoint APIEndpoint, userAgent string) (string, error) {
+func loginV1(authConfig *types.AuthConfig, apiEndpoint APIEndpoint, userAgent string) (string, string, error) {
 	registryEndpoint, err := apiEndpoint.ToV1Endpoint(userAgent, nil)
 	if err != nil {
-		return "", err
+		return "", "", err
 	}
 
 	serverAddress := registryEndpoint.String()
@@ -27,48 +32,47 @@ func loginV1(authConfig *types.AuthConfig, apiEndpoint APIEndpoint, userAgent st
 	logrus.Debugf("attempting v1 login to registry endpoint %s", registryEndpoint)
 
 	if serverAddress == "" {
-		return "", fmt.Errorf("Server Error: Server Address not set.")
+		return "", "", fmt.Errorf("Server Error: Server Address not set.")
 	}
 
 	loginAgainstOfficialIndex := serverAddress == IndexServer
 
 	req, err := http.NewRequest("GET", serverAddress+"users/", nil)
 	if err != nil {
-		return "", err
+		return "", "", err
 	}
 	req.SetBasicAuth(authConfig.Username, authConfig.Password)
 	resp, err := registryEndpoint.client.Do(req)
 	if err != nil {
 		// fallback when request could not be completed
-		return "", fallbackError{
+		return "", "", fallbackError{
 			err: err,
 		}
 	}
 	defer resp.Body.Close()
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
-		return "", err
+		return "", "", err
 	}
 	if resp.StatusCode == http.StatusOK {
-		return "Login Succeeded", nil
+		return "Login Succeeded", "", nil
 	} else if resp.StatusCode == http.StatusUnauthorized {
 		if loginAgainstOfficialIndex {
-			return "", fmt.Errorf("Wrong login/password, please try again. Haven't got a Docker ID? Create one at https://hub.docker.com")
+			return "", "", fmt.Errorf("Wrong login/password, please try again. Haven't got a Docker ID? Create one at https://hub.docker.com")
 		}
-		return "", fmt.Errorf("Wrong login/password, please try again")
+		return "", "", fmt.Errorf("Wrong login/password, please try again")
 	} else if resp.StatusCode == http.StatusForbidden {
 		if loginAgainstOfficialIndex {
-			return "", fmt.Errorf("Login: Account is not active. Please check your e-mail for a confirmation link.")
+			return "", "", fmt.Errorf("Login: Account is not active. Please check your e-mail for a confirmation link.")
 		}
 		// *TODO: Use registry configuration to determine what this says, if anything?
-		return "", fmt.Errorf("Login: Account is not active. Please see the documentation of the registry %s for instructions how to activate it.", serverAddress)
+		return "", "", fmt.Errorf("Login: Account is not active. Please see the documentation of the registry %s for instructions how to activate it.", serverAddress)
 	} else if resp.StatusCode == http.StatusInternalServerError { // Issue #14326
 		logrus.Errorf("%s returned status code %d. Response Body :\n%s", req.URL.String(), resp.StatusCode, body)
-		return "", fmt.Errorf("Internal Server Error")
-	} else {
-		return "", fmt.Errorf("Login: %s (Code: %d; Headers: %s)", body,
-			resp.StatusCode, resp.Header)
+		return "", "", fmt.Errorf("Internal Server Error")
 	}
+	return "", "", fmt.Errorf("Login: %s (Code: %d; Headers: %s)", body,
+		resp.StatusCode, resp.Header)
 }
 
 type loginCredentialStore struct {
@@ -79,6 +83,14 @@ func (lcs loginCredentialStore) Basic(*url.URL) (string, string) {
 	return lcs.authConfig.Username, lcs.authConfig.Password
 }
 
+func (lcs loginCredentialStore) RefreshToken(*url.URL, string) string {
+	return lcs.authConfig.IdentityToken
+}
+
+func (lcs loginCredentialStore) SetRefreshToken(u *url.URL, service, token string) {
+	lcs.authConfig.IdentityToken = token
+}
+
 type fallbackError struct {
 	err error
 }
@@ -90,7 +102,7 @@ func (err fallbackError) Error() string {
 // loginV2 tries to login to the v2 registry server. The given registry
 // endpoint will be pinged to get authorization challenges. These challenges
 // will be used to authenticate against the registry to validate credentials.
-func loginV2(authConfig *types.AuthConfig, endpoint APIEndpoint, userAgent string) (string, error) {
+func loginV2(authConfig *types.AuthConfig, endpoint APIEndpoint, userAgent string) (string, string, error) {
 	logrus.Debugf("attempting v2 login to registry endpoint %s", endpoint)
 
 	modifiers := DockerHeaders(userAgent, nil)
@@ -101,14 +113,21 @@ func loginV2(authConfig *types.AuthConfig, endpoint APIEndpoint, userAgent strin
 		if !foundV2 {
 			err = fallbackError{err: err}
 		}
-		return "", err
+		return "", "", err
 	}
 
+	credentialAuthConfig := *authConfig
 	creds := loginCredentialStore{
-		authConfig: authConfig,
+		authConfig: &credentialAuthConfig,
 	}
 
-	tokenHandler := auth.NewTokenHandler(authTransport, creds, "")
+	tokenHandlerOptions := auth.TokenHandlerOptions{
+		Transport:     authTransport,
+		Credentials:   creds,
+		OfflineAccess: true,
+		ClientID:      AuthClientID,
+	}
+	tokenHandler := auth.NewTokenHandlerWithOptions(tokenHandlerOptions)
 	basicHandler := auth.NewBasicHandler(creds)
 	modifiers = append(modifiers, auth.NewAuthorizer(challengeManager, tokenHandler, basicHandler))
 	tr := transport.NewTransport(authTransport, modifiers...)
@@ -124,7 +143,7 @@ func loginV2(authConfig *types.AuthConfig, endpoint APIEndpoint, userAgent strin
 		if !foundV2 {
 			err = fallbackError{err: err}
 		}
-		return "", err
+		return "", "", err
 	}
 
 	resp, err := loginClient.Do(req)
@@ -132,7 +151,7 @@ func loginV2(authConfig *types.AuthConfig, endpoint APIEndpoint, userAgent strin
 		if !foundV2 {
 			err = fallbackError{err: err}
 		}
-		return "", err
+		return "", "", err
 	}
 	defer resp.Body.Close()
 
@@ -142,10 +161,10 @@ func loginV2(authConfig *types.AuthConfig, endpoint APIEndpoint, userAgent strin
 		if !foundV2 {
 			err = fallbackError{err: err}
 		}
-		return "", err
+		return "", "", err
 	}
 
-	return "Login Succeeded", nil
+	return "Login Succeeded", credentialAuthConfig.IdentityToken, nil
 
 }
 

docs/service.go

@@ -2,6 +2,7 @@ package registry
 
 import (
 	"crypto/tls"
+	"fmt"
 	"net/http"
 	"net/url"
 	"strings"
@@ -29,10 +30,19 @@ func NewService(options *Options) *Service {
 // Auth contacts the public registry with the provided credentials,
 // and returns OK if authentication was successful.
 // It can be used to verify the validity of a client's credentials.
-func (s *Service) Auth(authConfig *types.AuthConfig, userAgent string) (status string, err error) {
-	endpoints, err := s.LookupPushEndpoints(authConfig.ServerAddress)
+func (s *Service) Auth(authConfig *types.AuthConfig, userAgent string) (status, token string, err error) {
+	serverAddress := authConfig.ServerAddress
+	if !strings.HasPrefix(serverAddress, "https://") && !strings.HasPrefix(serverAddress, "http://") {
+		serverAddress = "https://" + serverAddress
+	}
+	u, err := url.Parse(serverAddress)
 	if err != nil {
-		return "", err
+		return "", "", fmt.Errorf("unable to parse server address: %v", err)
+	}
+
+	endpoints, err := s.LookupPushEndpoints(u.Host)
+	if err != nil {
+		return "", "", err
 	}
 
 	for _, endpoint := range endpoints {
@@ -41,7 +51,7 @@ func (s *Service) Auth(authConfig *types.AuthConfig, userAgent string) (status s
 			login = loginV1
 		}
 
-		status, err = login(authConfig, endpoint, userAgent)
+		status, token, err = login(authConfig, endpoint, userAgent)
 		if err == nil {
 			return
 		}
@@ -50,10 +60,10 @@ func (s *Service) Auth(authConfig *types.AuthConfig, userAgent string) (status s
 			logrus.Infof("Error logging in to %s endpoint, trying next endpoint: %v", endpoint.Version, err)
 			continue
 		}
-		return "", err
+		return "", "", err
 	}
 
-	return "", err
+	return "", "", err
 }
 
 // splitReposSearchTerm breaks a search term into an index name and remote name

docs/service_v2.go

@@ -10,7 +10,7 @@ import (
 func (s *Service) lookupV2Endpoints(hostname string) (endpoints []APIEndpoint, err error) {
 	var cfg = tlsconfig.ServerDefault
 	tlsConfig := &cfg
-	if hostname == DefaultNamespace {
+	if hostname == DefaultNamespace || hostname == DefaultV1Registry.Host {
 		// v2 mirrors
 		for _, mirror := range s.Config.Mirrors {
 			if !strings.HasPrefix(mirror, "http://") && !strings.HasPrefix(mirror, "https://") {