feat: setup UI endpoint to serve the UI

closes trustbloc#39

Signed-off-by: talwinder.kaur <talwinder.kaur@securekey.com>

cmd/auth-rest/startcmd/start.go

@@ -79,6 +79,11 @@ const (
 		" For CouchDB, include the username:password@ text if required." +
 		" Alternatively, this can be set with the following environment variable: " + databaseURLEnvKey
 
+	staticFilesPathFlagName  = "static-path"
+	staticFilesPathFlagUsage = "Path to the folder where the static files are to be hosted under " + uiEndpoint + "." +
+		"Alternatively, this can be set with the following environment variable: " + staticFilesPathEnvKey
+	staticFilesPathEnvKey = "AUTH_REST_STATIC_FILES"
+
 	databasePrefixFlagName      = "database-prefix"
 	databasePrefixEnvKey        = "AUTH_REST_DATABASE_PREFIX"
 	databasePrefixFlagShorthand = "p"
@@ -129,6 +134,7 @@ const (
 
 const (
 	// api
+	uiEndpoint          = "/ui"
 	healthCheckEndpoint = "/healthcheck"
 )
 
@@ -143,6 +149,7 @@ type authRestParameters struct {
 	tlsParams       *tlsParams
 	oidcParams      *oidcParams
 	bootstrapParams *bootstrapParams
+	staticFiles     string
 }
 
 type tlsParams struct {
@@ -231,6 +238,11 @@ func getAuthRestParameters(cmd *cobra.Command) (*authRestParameters, error) {
 		return nil, err
 	}
 
+	staticFiles, err := cmdutils.GetUserSetVarFromString(cmd, staticFilesPathFlagName, staticFilesPathEnvKey, true)
+	if err != nil {
+		return nil, err
+	}
+
 	var databaseURL string
 	if databaseType == databaseTypeMemOption {
 		databaseURL = "N/A"
@@ -266,6 +278,7 @@ func getAuthRestParameters(cmd *cobra.Command) (*authRestParameters, error) {
 		databasePrefix:  databasePrefix,
 		oidcParams:      oidcParams,
 		bootstrapParams: bootstrapParams,
+		staticFiles:     staticFiles,
 	}, nil
 }
 
@@ -311,6 +324,7 @@ func createFlags(startCmd *cobra.Command) {
 	startCmd.Flags().StringP(tlsServeCertPathFlagName, "", "", tlsServeCertPathFlagUsage)
 	startCmd.Flags().StringP(tlsServeKeyPathFlagName, "", "", tlsServeKeyPathFlagUsage)
 	startCmd.Flags().StringP(logLevelFlagName, logLevelFlagShorthand, "", logLevelPrefixFlagUsage)
+	startCmd.Flags().StringP(staticFilesPathFlagName, "", "", staticFilesPathFlagUsage)
 	startCmd.Flags().StringP(databaseTypeFlagName, databaseTypeFlagShorthand, "", databaseTypeFlagUsage)
 	startCmd.Flags().StringP(databaseURLFlagName, databaseURLFlagShorthand, "", databaseURLFlagUsage)
 	startCmd.Flags().StringP(databasePrefixFlagName, databasePrefixFlagShorthand, "", databasePrefixFlagUsage)
@@ -340,7 +354,6 @@ func startAuthService(parameters *authRestParameters, srv server) error {
 	logger.Debugf("root ca's %v", rootCAs)
 
 	router := mux.NewRouter()
-
 	// health check
 	router.HandleFunc(healthCheckEndpoint, healthCheckHandler).Methods(http.MethodGet)
 
@@ -368,12 +381,16 @@ func startAuthService(parameters *authRestParameters, srv server) error {
 		router.HandleFunc(handler.Path(), handler.Handle()).Methods(handler.Method())
 	}
 
-	logger.Infof(`Starting hub-auth REST server with the following parameters: 
-Host URL: %s
-Database type: %s
+	logger.Infof(`Starting hub-auth REST server with the following parameters:Host URL: %s Database type: %s
 Database URL: %s
 Database prefix: %s`, parameters.hostURL, parameters.databaseType, parameters.databaseURL, parameters.databasePrefix)
 
+	// static frontend
+	router.PathPrefix(uiEndpoint).
+		Subrouter().
+		Methods(http.MethodGet).
+		HandlerFunc(uiHandler(parameters.staticFiles, http.ServeFile))
+
 	return srv.ListenAndServeTLS(
 		parameters.hostURL,
 		parameters.tlsParams.serveCertPath,
@@ -382,6 +399,19 @@ Database prefix: %s`, parameters.hostURL, parameters.databaseType, parameters.da
 	)
 }
 
+func uiHandler(
+	basePath string,
+	fileServer func(http.ResponseWriter, *http.Request, string)) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path == uiEndpoint {
+			fileServer(w, r, strings.ReplaceAll(basePath+"/index.html", "//", "/"))
+			return
+		}
+
+		fileServer(w, r, strings.ReplaceAll(basePath+"/"+r.URL.Path[len(uiEndpoint):], "//", "/"))
+	}
+}
+
 func getOIDCParams(cmd *cobra.Command) (*oidcParams, error) {
 	params := &oidcParams{}
 

cmd/auth-rest/startcmd/start_test.go

@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"os"
 	"strings"
 	"testing"
@@ -197,6 +198,26 @@ func TestStartCmdWithBlankEnvVar(t *testing.T) {
 	})
 }
 
+func TestUIHandler(t *testing.T) {
+	t.Run("handle base path", func(t *testing.T) {
+		handled := false
+		uiHandler(uiEndpoint, func(_ http.ResponseWriter, _ *http.Request, path string) {
+			handled = true
+			require.Equal(t, uiEndpoint+"/index.html", path)
+		})(nil, &http.Request{URL: &url.URL{Path: uiEndpoint}})
+		require.True(t, handled)
+	})
+	t.Run("handle subpaths", func(t *testing.T) {
+		const expected = uiEndpoint + "/css/abc123.css"
+		handled := false
+		uiHandler(uiEndpoint, func(_ http.ResponseWriter, _ *http.Request, path string) {
+			handled = true
+			require.Equal(t, expected, path)
+		})(nil, &http.Request{URL: &url.URL{Path: expected}})
+		require.True(t, handled)
+	})
+}
+
 func TestStartCmdValidArgs(t *testing.T) {
 	t.Run("In-memory storage, valid log level", func(t *testing.T) {
 		oidcURL := mockOIDCProvider(t)

pkg/restapi/operation/operations.go

@@ -13,6 +13,7 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
+	"net/url"
 
 	"github.com/coreos/go-oidc"
 	"github.com/google/uuid"
@@ -33,6 +34,9 @@ const (
 
 	transientStoreName = "hub-auth-rest-transient"
 	bootstrapStoreName = "bootstrap-data"
+
+	// redirect url parameter
+	userProfile = "up"
 )
 
 var logger = log.New("hub-auth-restapi")
@@ -116,6 +120,7 @@ type Operation struct {
 	oidcClientID     string
 	oidcClientSecret string
 	oidcCallbackURL  string
+	uiEndpoint       string
 	oauth2ConfigFunc func(...string) oauth2Config
 	bootstrapStore   storage.Store
 	bootstrapConfig  *BootstrapConfig
@@ -129,6 +134,7 @@ type Config struct {
 	OIDCClientID           string
 	OIDCClientSecret       string
 	OIDCCallbackURL        string
+	UIEndpoint             string
 	TransientStoreProvider storage.Provider
 	StoreProvider          storage.Provider
 	BootstrapConfig        *BootstrapConfig
@@ -329,7 +335,15 @@ func (c *Operation) handleOIDCCallback(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	handleAuthResult(w, r, userProfile)
+	profileBytes, err := json.Marshal(userProfile)
+	if err != nil {
+		c.writeErrorResponse(w, http.StatusInternalServerError,
+			fmt.Sprintf("failed to marshal user profile data : %s", err))
+
+		return
+	}
+
+	c.handleAuthResult(w, r, profileBytes)
 }
 
 // TODO onboard user at key server and SDS: https://github.com/trustbloc/hub-auth/issues/38
@@ -388,9 +402,21 @@ func (c *Operation) handleBootstrapDataRequest(w http.ResponseWriter, r *http.Re
 	}
 }
 
-// TODO redirect to the UI: https://github.com/trustbloc/hub-auth/issues/39
-func handleAuthResult(w http.ResponseWriter, r *http.Request, _ *user.Profile) {
-	http.Redirect(w, r, "", http.StatusFound)
+func (c *Operation) handleAuthResult(w http.ResponseWriter, r *http.Request, profileBytes []byte) {
+	handle := url.QueryEscape(uuid.New().String())
+
+	err := c.transientStore.Put(handle, profileBytes)
+	if err != nil {
+		c.writeErrorResponse(w,
+			http.StatusInternalServerError, fmt.Sprintf("failed to write handle to transient store: %s", err))
+
+		return
+	}
+
+	redirectURL := fmt.Sprintf("%s?%s=%s", c.uiEndpoint, userProfile, handle)
+
+	http.Redirect(w, r, redirectURL, http.StatusFound)
+	logger.Debugf("redirected to: %s", redirectURL)
 }
 
 func handleAuthError(w http.ResponseWriter, status int, msg string) {

pkg/restapi/operation/operations_test.go

@@ -411,6 +411,30 @@ func TestHandleOIDCCallback(t *testing.T) {
 		svc.handleOIDCCallback(result, newOIDCCallback(state, "code"))
 		require.Equal(t, http.StatusInternalServerError, result.Code)
 	})
+	t.Run("PUT error while storing user info while handling callback user", func(t *testing.T) {
+		id := uuid.New().String()
+		state := uuid.New().String()
+		config := config(t)
+
+		config.TransientStoreProvider = &mockstorage.Provider{
+			Stores: map[string]storage.Store{
+				transientStoreName: &mockstore.MockStore{
+					Store: map[string][]byte{
+						id: []byte("{}"),
+					},
+					ErrGet: storage.ErrValueNotFound,
+					ErrPut: errors.New("generic"),
+				},
+			},
+		}
+
+		svc, err := New(config)
+		require.NoError(t, err)
+
+		result := httptest.NewRecorder()
+		svc.handleAuthResult(result, newOIDCCallback(state, "code"), nil)
+		require.Equal(t, http.StatusInternalServerError, result.Code)
+	})
 }
 
 func TestHandleBootstrapDataRequest(t *testing.T) {