// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-present Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package oauth2server

import (
	"net/url"
	"strings"
)

// ValidateRedirectURI checks that the redirect_uri uses a scheme starting with
// "vikunja-". This allowlists only Vikunja native app schemes (e.g.
// vikunja-flutter://callback) and rejects dangerous schemes like javascript:,
// data:, http:, https:, etc.
func ValidateRedirectURI(redirectURI string) bool {
	u, err := url.Parse(redirectURI)
	if err != nil || u.Scheme == "" {
		return false
	}

	return strings.HasPrefix(u.Scheme, "vikunja-")
}