google-c2p resolver: add authority entry to bootstrap config (#5680)

xds/googledirectpath/googlec2p.go

@@ -110,14 +110,20 @@ func (c2pResolverBuilder) Build(t resolver.Target, cc resolver.ClientConn, opts
 	if balancerName == "" {
 		balancerName = tdURL
 	}
-	config := &bootstrap.Config{
+	serverConfig := &bootstrap.ServerConfig{
-		XDSServer: &bootstrap.ServerConfig{
 		ServerURI:    balancerName,
 		Creds:        grpc.WithCredentialsBundle(google.NewDefaultCredentials()),
 		TransportAPI: version.TransportV3,
 		NodeProto:    newNode(<-zoneCh, <-ipv6CapableCh),
-		},
+	}
+	config := &bootstrap.Config{
+		XDSServer: serverConfig,
 		ClientDefaultListenerResourceNameTemplate: "%s",
+		Authorities: map[string]*bootstrap.Authority{
+			"traffic-director-c2p.xds.googleapis.com": {
+				XDSServer: serverConfig,
+			},
+		},
 	}
 
 	// Create singleton xds client with this config. The xds client will be

xds/googledirectpath/googlec2p_test.go

@@ -211,13 +211,19 @@ func TestBuildXDS(t *testing.T) {
 					},
 				}
 			}
-			wantConfig := &bootstrap.Config{
+			serverConfig := &bootstrap.ServerConfig{
-				XDSServer: &bootstrap.ServerConfig{
 				ServerURI:    tdURL,
 				TransportAPI: version.TransportV3,
 				NodeProto:    wantNode,
-				},
+			}
+			wantConfig := &bootstrap.Config{
+				XDSServer: serverConfig,
 				ClientDefaultListenerResourceNameTemplate: "%s",
+				Authorities: map[string]*bootstrap.Authority{
+					"traffic-director-c2p.xds.googleapis.com": {
+						XDSServer: serverConfig,
+					},
+				},
 			}
 			if tt.tdURI != "" {
 				wantConfig.XDSServer.ServerURI = tt.tdURI