PatchCollectionHandler.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.collection;

import io.undertow.server.HttpServerExchange;
import io.undertow.util.Headers;
import org.bson.BsonDocument;
import org.bson.BsonValue;
import org.restheart.db.OperationResult;
import org.restheart.handlers.metadata.InvalidMetadataException;
import org.restheart.metadata.Relationship;
import org.restheart.metadata.transformers.RepresentationTransformer;
import org.restheart.metadata.checkers.RequestChecker;
import org.restheart.handlers.PipedHttpHandler;
import org.restheart.handlers.RequestContext;
import org.restheart.handlers.injectors.LocalCachesSingleton;
import org.restheart.utils.HttpStatus;
import org.restheart.utils.ResponseHelper;

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

    /**
     * Creates a new instance of PatchCollectionHandler
     */
    public PatchCollectionHandler() {
        super();
    }

    /**
     * Creates a new instance of PatchCollectionHandler
     *
     * @param next
     */
    public PatchCollectionHandler(PipedHttpHandler next) {
        super(next);
    }

    /**
     *
     * @param exchange
     * @param context
     * @throws Exception
     */
    @Override
    public void handleRequest(HttpServerExchange exchange, RequestContext context) throws Exception {
        if (context.isInError()) {
            next(exchange, context);
            return;
        }
        
        if (context.getDBName().isEmpty()) {
            ResponseHelper.endExchangeWithMessage(
                    exchange,
                    context,
                    HttpStatus.SC_NOT_ACCEPTABLE,
                    "wrong request, db name cannot be empty");
            next(exchange, context);
            return;
        }

        if (context.getCollectionName().isEmpty()
                || context.getCollectionName().startsWith("_")) {
            ResponseHelper.endExchangeWithMessage(
                    exchange,
                    context,
                    HttpStatus.SC_NOT_ACCEPTABLE,
                    "wrong request, collection name cannot be "
                    + "empty or start with _");
            next(exchange, context);
            return;
        }

        BsonValue _content = context.getContent();

        if (_content == null) {
            ResponseHelper.endExchangeWithMessage(
                    exchange,
                    context,
                    HttpStatus.SC_NOT_ACCEPTABLE,
                    "no data provided");
            next(exchange, context);
            return;
        }

        // cannot PATCH with an array
        if (!_content.isDocument()) {
            ResponseHelper.endExchangeWithMessage(
                    exchange,
                    context,
                    HttpStatus.SC_NOT_ACCEPTABLE,
                    "data must be a json object");
            next(exchange, context);
            return;
        }

        if (_content.asDocument().isEmpty()) {
            ResponseHelper.endExchangeWithMessage(
                    exchange,
                    context,
                    HttpStatus.SC_NOT_ACCEPTABLE,
                    "no data provided");
            next(exchange, context);
            return;
        }

        BsonDocument content = _content.asDocument();

        // check RELS metadata
        if (content.containsKey(Relationship.RELATIONSHIPS_ELEMENT_NAME)) {
            try {
                Relationship.getFromJson(content);
            } catch (InvalidMetadataException ex) {
                ResponseHelper.endExchangeWithMessage(
                        exchange,
                        context,
                        HttpStatus.SC_NOT_ACCEPTABLE,
                        "wrong relationships definition. "
                        + ex.getMessage(), ex);
                next(exchange, context);
                return;
            }
        }

        // check RT metadata
        if (content.containsKey(RepresentationTransformer.RTS_ELEMENT_NAME)) {
            try {
                RepresentationTransformer.getFromJson(content);
            } catch (InvalidMetadataException ex) {
                ResponseHelper.endExchangeWithMessage(
                        exchange,
                        context,
                        HttpStatus.SC_NOT_ACCEPTABLE,
                        "wrong representation transformer definition. "
                        + ex.getMessage(), ex);
                next(exchange, context);
                return;
            }
        }

        // check SC metadata
        if (content.containsKey(RequestChecker.ROOT_KEY)) {
            try {
                RequestChecker.getFromJson(content);
            } catch (InvalidMetadataException ex) {
                ResponseHelper.endExchangeWithMessage(
                        exchange,
                        context,
                        HttpStatus.SC_NOT_ACCEPTABLE,
                        "wrong checker definition. "
                        + ex.getMessage(), ex);
                next(exchange, context);
                return;
            }
        }

        OperationResult result = getDatabase()
                .upsertCollection(
                        context.getDBName(),
                        context.getCollectionName(),
                        content,
                        context.getETag(),
                        true,
                        true,
                        context.isETagCheckRequired());

        context.setDbOperationResult(result);

        // inject the etag
        if (result.getEtag() != null) {
            ResponseHelper.injectEtagHeader(exchange, result.getEtag());
        }

        if (result.getHttpCode() == HttpStatus.SC_CONFLICT) {
            ResponseHelper.endExchangeWithMessage(exchange,
                    context,
                    HttpStatus.SC_CONFLICT,
                    "The collection's ETag must be provided using the '"
                    + Headers.IF_MATCH + "' header.");
            next(exchange, context);
            return;
        }

        context.setResponseStatusCode(result.getHttpCode());

        LocalCachesSingleton.getInstance()
                .invalidateCollection(
                        context.getDBName(),
                        context.getCollectionName());

        next(exchange, context);
    }
}