Return proper errors when admin API is not initialized (#6988)

Especially in gateway IAM admin APIs are not enabled
if etcd is not enabled, we should enable admin API though
but only enable IAM and Config APIs with etcd configured.

cmd/admin-handlers_test.go

@@ -277,7 +277,7 @@ func prepareAdminXLTestBed() (*adminXLTestBed, error) {
 
 	// Setup admin mgmt REST API handlers.
 	adminRouter := mux.NewRouter()
-	registerAdminRouter(adminRouter)
+	registerAdminRouter(adminRouter, true)
 
 	return &adminXLTestBed{
 		xlDirs:   xlDirs,

cmd/admin-router.go

@@ -31,7 +31,7 @@ type adminAPIHandlers struct {
 }
 
 // registerAdminRouter - Add handler functions for each service REST API routes.
-func registerAdminRouter(router *mux.Router) {
+func registerAdminRouter(router *mux.Router, enableIAM bool) {
 
 	adminAPI := adminAPIHandlers{}
 	// Admin router
@@ -69,6 +69,7 @@ func registerAdminRouter(router *mux.Router) {
 
 	/// Config operations
 
+	if enableIAM {
 		// Update credentials
 		adminV1Router.Methods(http.MethodPut).Path("/config/credential").HandlerFunc(httpTraceHdrs(adminAPI.UpdateAdminCredentialsHandler))
 		// Get config
@@ -104,7 +105,8 @@ func registerAdminRouter(router *mux.Router) {
 
 		// List policies
 		adminV1Router.Methods(http.MethodGet).Path("/list-canned-policies").HandlerFunc(httpTraceHdrs(adminAPI.ListCannedPolicies))
+	}
 
-	// If none of the routes match.
-	adminV1Router.NotFoundHandler = http.HandlerFunc(httpTraceHdrs(notFoundHandler))
+	// If none of the routes match, return error.
+	adminV1Router.NotFoundHandler = http.HandlerFunc(httpTraceHdrs(notFoundHandlerJSON))
 }

cmd/gateway-main.go

@@ -173,11 +173,12 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	if globalEtcdClient != nil {
 		// Enable STS router if etcd is enabled.
 		registerSTSRouter(router)
-
-		// Enable admin router if etcd is enabled.
-		registerAdminRouter(router)
 	}
 
+	// Enable IAM admin APIs if etcd is enabled, if not just enable basic
+	// operations such as profiling, server info etc.
+	registerAdminRouter(router, globalEtcdClient != nil)
+
 	// Add healthcheck router
 	registerHealthCheckRouter(router)
 
@@ -307,5 +308,8 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		printGatewayStartupMessage(getAPIEndpoints(), gatewayName)
 	}
 
+	// Set uptime time after object layer has initialized.
+	globalBootTime = UTCNow()
+
 	handleSignals()
 }

cmd/handler-utils.go

@@ -351,6 +351,12 @@ func getResource(path string, host string, domain string) (string, error) {
 	return slashSeparator + pathJoin(bucket, path), nil
 }
 
+// If none of the http routes match respond with MethodNotAllowed, in JSON
+func notFoundHandlerJSON(w http.ResponseWriter, r *http.Request) {
+	writeErrorResponseJSON(w, ErrMethodNotAllowed, r.URL)
+	return
+}
+
 // If none of the http routes match respond with MethodNotAllowed
 func notFoundHandler(w http.ResponseWriter, r *http.Request) {
 	writeErrorResponse(w, ErrMethodNotAllowed, r.URL, guessIsBrowserReq(r))

cmd/routers.go

@@ -107,8 +107,8 @@ func configureServerHandler(endpoints EndpointList) (http.Handler, error) {
 	// Add Admin RPC router
 	registerAdminRPCRouter(router)
 
-	// Add Admin router.
-	registerAdminRouter(router)
+	// Add Admin router, all APIs are enabled in server mode.
+	registerAdminRouter(router, true)
 
 	// Add healthcheck router
 	registerHealthCheckRouter(router)