/*
 * Copyright 2023 Thoughtworks, Inc.
 *
 * 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.
 */

package com.thoughtworks.go.apiv1.webhook.controller.validation;

import com.thoughtworks.go.apiv1.webhook.request.WebhookRequest;
import com.thoughtworks.go.config.exceptions.HttpException;

import java.security.MessageDigest;
import java.util.Set;
import java.util.function.Function;

import static org.apache.commons.lang3.StringUtils.isBlank;

public class GitLab implements ValidateAuth.Provider {
    public static final Set<String> PUSH = Set.of("Push Hook");
    public static final Set<String> PR = Set.of("Merge Request Hook");

    public void auth(String webhookSecret, WebhookRequest request, Function<String, HttpException> fail) {
        final String token = request.authToken();

        if (isBlank(token)) {
            throw fail.apply("No token specified in the 'X-Gitlab-Token' header!");
        }

        if (!MessageDigest.isEqual(token.getBytes(), webhookSecret.getBytes())) {
            throw fail.apply("Token specified in the 'X-Gitlab-Token' header did not match!");
        }
    }

    public GitLab() {
    }
}
