/*
 * Copyright 2020 The Matrix.org Foundation C.I.C.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export function isValidUrl(val: string): boolean {
    if (!val) return false; // easy: not valid if not present

    try {
        const parsed = new URL(val);
        if (parsed.protocol !== "http" && parsed.protocol !== "https") {
            return false;
        }
        return true;
    } catch (e) {
        if (e instanceof TypeError) {
            return false;
        }
        throw e;
    }
}