CheckHandler.java

/*
 * RESTHeart - the Web API for MongoDB
 * Copyright (C) SoftInstigate Srl
 * 
 * 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 org.restheart.handlers.metadata;

import io.undertow.server.HttpServerExchange;
import java.util.Arrays;
import java.util.List;
import org.restheart.metadata.checkers.Checker;
import org.restheart.handlers.PipedHttpHandler;
import org.restheart.handlers.RequestContext;
import org.restheart.utils.HttpStatus;
import org.restheart.utils.ResponseHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * handler that applies the checkers passed in the costructor
 *
 * @author Andrea Di Cesare {@literal <andrea@softinstigate.com>}
 */
public class CheckHandler extends PipedHttpHandler {
    static final Logger LOGGER = LoggerFactory.getLogger(CheckHandler.class);

    private final List<Checker> checkers;

    /**
     * Creates a new instance of CheckHandler
     *
     * @param next
     * @param checkers
     */
    public CheckHandler(PipedHttpHandler next, Checker... checkers) {
        super(next);

        this.checkers = Arrays.asList(checkers);
    }

    @Override
    public void handleRequest(
            HttpServerExchange exchange,
            RequestContext context)
            throws Exception {
        if (doesCheckerAppy()) {
            if (check(exchange, context)) {
                next(exchange, context);
            } else {
                ResponseHelper.endExchangeWithMessage(
                        exchange,
                        context,
                        HttpStatus.SC_BAD_REQUEST,
                        "request check failed");
                next(exchange, context);
                return;
            }
        } else {
            next(exchange, context);
        }
    }

    private boolean doesCheckerAppy() {
        return checkers != null
                && !checkers.isEmpty();
    }

    private boolean check(
            HttpServerExchange exchange,
            RequestContext context)
            throws InvalidMetadataException {
        if (context.getContent() != null
                && !context.getContent().isDocument()) {
            throw new RuntimeException(
                    "this hanlder only supports content of type json object; "
                    + "content type: " + context
                            .getContent()
                            .getBsonType()
                            .name());
        }

        return checkers.stream().allMatch(checker
                -> checker.check(exchange,
                        context,
                        context.getContent().asDocument(),
                        null));
    }
}