Add option to always display connector selection even if there's only one

cmd/dex/config.go

@@ -127,6 +127,8 @@ type OAuth2 struct {
 	// If specified, do not prompt the user to approve client authorization. The
 	// act of logging in implies authorization.
 	SkipApprovalScreen bool `json:"skipApprovalScreen"`
+	// If specified, show the connector selection screen even if there's only one
+	AlwaysShowLoginScreen bool `json:"alwaysShowLoginScreen"`
 }
 
 // Web is the config format for the HTTP server.

cmd/dex/config_test.go

@@ -76,6 +76,9 @@ staticClients:
   name: 'Example App'
   secret: ZXhhbXBsZS1hcHAtc2VjcmV0
 
+oauth2:
+  alwaysShowLoginScreen: true
+
 connectors:
 - type: mockCallback
   id: mock
@@ -140,6 +143,9 @@ logger:
 				},
 			},
 		},
+		OAuth2: OAuth2{
+			AlwaysShowLoginScreen: true,
+		},
 		StaticConnectors: []Connector{
 			{
 				Type:   "mockCallback",

cmd/dex/serve.go

@@ -199,6 +199,7 @@ func serve(cmd *cobra.Command, args []string) error {
 	serverConfig := server.Config{
 		SupportedResponseTypes: c.OAuth2.ResponseTypes,
 		SkipApprovalScreen:     c.OAuth2.SkipApprovalScreen,
+		AlwaysShowLoginScreen:  c.OAuth2.AlwaysShowLoginScreen,
 		AllowedOrigins:         c.Web.AllowedOrigins,
 		Issuer:                 c.Issuer,
 		Storage:                s,