allow to hide login form (#459) (#470)

use the `hide_login_form` parameter in the `auth` settings to configure this feature

internal/app/api/v0/handlers/endpoint_config.go

@@ -96,10 +96,13 @@ func (e ConfigEndpoint) handleSettingsGet() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		sessionUser := domain.GetUserInfo(r.Context())
 
+		hasSocialLogin := len(e.cfg.Auth.OAuth) > 0 || len(e.cfg.Auth.OpenIDConnect) > 0 || e.cfg.Auth.WebAuthn.Enabled
+
 		// For anonymous users, we return the settings object with minimal information
 		if sessionUser.Id == domain.CtxUnknownUserId || sessionUser.Id == "" {
 			respond.JSON(w, http.StatusOK, model.Settings{
-				WebAuthnEnabled: e.cfg.Auth.WebAuthn.Enabled,
+				WebAuthnEnabled:  e.cfg.Auth.WebAuthn.Enabled,
+				LoginFormVisible: !e.cfg.Auth.HideLoginForm || !hasSocialLogin,
 			})
 		} else {
 			respond.JSON(w, http.StatusOK, model.Settings{
@@ -109,6 +112,7 @@ func (e ConfigEndpoint) handleSettingsGet() http.HandlerFunc {
 				ApiAdminOnly:              e.cfg.Advanced.ApiAdminOnly,
 				WebAuthnEnabled:           e.cfg.Auth.WebAuthn.Enabled,
 				MinPasswordLength:         e.cfg.Auth.MinPasswordLength,
+				LoginFormVisible:          !e.cfg.Auth.HideLoginForm || !hasSocialLogin,
 			})
 		}
 	}

internal/app/api/v0/model/models.go

@@ -12,4 +12,5 @@ type Settings struct {
 	ApiAdminOnly              bool `json:"ApiAdminOnly"`
 	WebAuthnEnabled           bool `json:"WebAuthnEnabled"`
 	MinPasswordLength         int  `json:"MinPasswordLength"`
+	LoginFormVisible          bool `json:"LoginFormVisible"`
 }