UI Customize: add custom-theme flag for default theme (#33042)

server/http.go

@@ -55,6 +55,7 @@ type Customization struct {
 	Website   string
 	Email     string
 	Phone     string
+	Theme     string
 }
 
 // NewHTTPd creates HTTP server with configured routes for loadpoint
@@ -112,6 +113,12 @@ func NewHTTPd(addr string, hub *SocketHub, custom Customization) *HTTPd {
 		log.FATAL.Fatal("custom logo requires both light and dark variants")
 	}
 
+	switch custom.Theme {
+	case "", "auto", "light", "dark":
+	default:
+		log.FATAL.Fatalf("invalid custom theme: %s (expected auto, light, dark)", custom.Theme)
+	}
+
 	for path, file := range map[string]string{
 		"/custom-logo-light": custom.LogoLight,
 		"/custom-logo-dark":  custom.LogoDark,

server/http_site_handler.go

@@ -59,6 +59,7 @@ func globalsJsHandler(custom Customization) http.HandlerFunc {
 		Website    string `json:"customWebsite"`
 		Email      string `json:"customEmail"`
 		Phone      string `json:"customPhone"`
+		Theme      string `json:"customTheme"`
 	}{
 		Version:    util.Version,
 		CustomCss:  custom.Css != "",
@@ -67,6 +68,7 @@ func globalsJsHandler(custom Customization) http.HandlerFunc {
 		Website:    custom.Website,
 		Email:      custom.Email,
 		Phone:      custom.Phone,
+		Theme:      custom.Theme,
 	}
 
 	return func(w http.ResponseWriter, r *http.Request) {