org.restheart.handlers.metadata.AfterWriteCheckHandler.java Source code

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Here is the source code for org.restheart.handlers.metadata.AfterWriteCheckHandler.java

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/*
 * 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 com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import static com.mongodb.client.model.Filters.and;
import static com.mongodb.client.model.Filters.eq;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.Headers;
import org.bson.BsonDocument;
import org.restheart.db.DAOUtils;
import org.restheart.db.MongoDBClientSingleton;
import org.restheart.handlers.PipedHttpHandler;
import org.restheart.handlers.RequestContext;
import org.restheart.handlers.RequestContext.METHOD;
import org.restheart.plugins.Checker;
import org.restheart.plugins.GlobalChecker;
import org.restheart.metadata.CheckerMetadata;
import org.restheart.utils.HttpStatus;
import org.restheart.utils.ResponseHelper;

/**
 *
 * @author Andrea Di Cesare {@literal <andrea@softinstigate.com>}
 */
public class AfterWriteCheckHandler extends BeforeWriteCheckHandler {

    public AfterWriteCheckHandler() {
        super(null);
    }

    public AfterWriteCheckHandler(PipedHttpHandler next) {
        super(next);
    }

    @Override
    public void handleRequest(HttpServerExchange exchange, RequestContext context) throws Exception {
        if ((doesCheckersApply(context) && !applyCheckers(exchange, context))
                || (doesGlobalCheckersApply() && !applyGlobalCheckers(exchange, context))) {
            // restore old data

            MongoClient client = MongoDBClientSingleton.getInstance().getClient();

            MongoDatabase mdb = client.getDatabase(context.getDBName());

            MongoCollection<BsonDocument> coll = mdb.getCollection(context.getCollectionName(), BsonDocument.class);

            BsonDocument oldData = context.getDbOperationResult().getOldData();

            Object newEtag = context.getDbOperationResult().getEtag();

            if (oldData != null) {
                // document was updated, restore old one
                DAOUtils.restoreDocument(context.getClientSession(), coll, oldData.get("_id"),
                        context.getShardKey(), oldData, newEtag, "_etag");

                // add to response old etag
                if (oldData.get("$set") != null && oldData.get("$set").isDocument()
                        && oldData.get("$set").asDocument().get("_etag") != null) {
                    exchange.getResponseHeaders().put(Headers.ETAG,
                            oldData.get("$set").asDocument().get("_etag").asObjectId().getValue().toString());
                } else {
                    exchange.getResponseHeaders().remove(Headers.ETAG);
                }

            } else {
                // document was created, delete it
                Object newId = context.getDbOperationResult().getNewData().get("_id");

                coll.deleteOne(and(eq("_id", newId), eq("_etag", newEtag)));
            }

            ResponseHelper.endExchangeWithMessage(exchange, context, HttpStatus.SC_BAD_REQUEST,
                    "request check failed");
            next(exchange, context);
            return;
        }

        next(exchange, context);
    }

    @Override
    boolean doesCheckersApply(RequestContext context) {
        return context.getCollectionProps() != null
                && (((context.getMethod() == METHOD.PUT || context.getMethod() == METHOD.PATCH)
                        && context.getType() == RequestContext.TYPE.FILE
                        || context.getType() == RequestContext.TYPE.DOCUMENT
                        || context.getType() == RequestContext.TYPE.SCHEMA)
                        || context.getMethod() == METHOD.POST
                                && (context.getType() == RequestContext.TYPE.COLLECTION
                                        || context.getType() == RequestContext.TYPE.FILES_BUCKET
                                        || context.getType() == RequestContext.TYPE.SCHEMA_STORE))
                && context.getCollectionProps().containsKey(CheckerMetadata.ROOT_KEY)
                && (context.getDbOperationResult() != null && context.getDbOperationResult().getHttpCode() < 300);
    }

    @Override
    protected boolean doesCheckersApply(RequestContext context, Checker checker) {
        return !context.isInError() && checker.getPhase(context) == Checker.PHASE.AFTER_WRITE;
    }

    @Override
    boolean doesGlobalCheckerApply(GlobalChecker gc, HttpServerExchange exchange, RequestContext context) {
        return gc.getPhase(context) == Checker.PHASE.AFTER_WRITE && gc.resolve(exchange, context);
    }
}