/*
 * Copyright (C) 2008-2023, Juick
 *
 * 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 <http://www.gnu.org/licenses/>.
 */

package com.juick.www.api.webhooks;

import com.juick.util.HttpForbiddenException;
import org.apache.commons.codec.digest.HmacUtils;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import java.io.InputStream;
import java.nio.charset.StandardCharsets;

@RestController
public class PatreonWebhook {
    private static final Logger logger = LoggerFactory.getLogger("Patreon");
    @Value("${patreon_secret:}")
    private String secretKey;

    @PostMapping(value = "/api/_patreon")
    @ResponseStatus(value = HttpStatus.OK)
    public void processUpdate(
            @RequestHeader(name = "X-Patreon-Event") String event,
            @RequestHeader(name = "X-Patreon-Signature") String signature,
            InputStream body) throws Exception {
        String data = IOUtils.toString(body, StandardCharsets.UTF_8);
        var actualSignature = HmacUtils.hmacMd5Hex(secretKey, data);
        logger.info("Event: {}, signature: {}, actual: {}", event, signature, actualSignature);
        if (!actualSignature.equals(signature)) {
            throw new HttpForbiddenException();
        }
        logger.info("Data: " + data);
    }
}