change colors to work in uint32 and Rgba type

httpUser.go

@@ -84,12 +84,6 @@ func HttpHandleUserNew(response http.ResponseWriter, request *http.Request) {
 		return
 	}
 
-	color, err := ConvertStringToRgb(request.FormValue("color"))
-	if err != nil {
-		http.Error(response, "bad color", http.StatusBadRequest)
-		return
-	}
-
 	hashedPassword, err := PasswordHash(password)
 	if err != nil {
 		http.Error(response, "internal server error", http.StatusInternalServerError)
@@ -99,7 +93,7 @@ func HttpHandleUserNew(response http.ResponseWriter, request *http.Request) {
 	newUser := &User{
 		Name:         username,
 		PasswordHash: hashedPassword,
-		Color:        color,
+		Color:        Rgba{}.GetRandom(),
 		CreatedAt:    time.Now(),
 	}
 
@@ -149,7 +143,7 @@ func HttpHandleUserModifyAppearance(response http.ResponseWriter, request *http.
 		return
 	}
 
-	color, err := ConvertStringToRgb(request.FormValue("color"))
+	color, err := ConvertStringToRgba(request.FormValue("color"))
 	if err != nil {
 		http.Error(response, "invalid color", http.StatusBadRequest)
 		return