io.knotx.repository.impl.FilesystemRepositoryConnectorProxyImpl.java Source code

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Here is the source code for io.knotx.repository.impl.FilesystemRepositoryConnectorProxyImpl.java

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/*
 * Copyright (C) 2016 Cognifide Limited
 *
 * 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 io.knotx.repository.impl;

import io.knotx.dataobjects.ClientRequest;
import io.knotx.dataobjects.ClientResponse;
import io.knotx.proxy.RepositoryConnectorProxy;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.vertx.core.AsyncResult;
import io.vertx.core.Future;
import io.vertx.core.Handler;
import io.vertx.core.Vertx;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.file.FileSystem;
import io.vertx.core.http.impl.MimeMapping;
import io.vertx.core.json.JsonObject;
import io.vertx.core.logging.Logger;
import io.vertx.core.logging.LoggerFactory;
import io.vertx.rx.java.ObservableFuture;
import io.vertx.rx.java.RxHelper;
import io.vertx.rxjava.core.MultiMap;
import java.nio.file.NoSuchFileException;
import java.util.Optional;
import org.apache.commons.lang3.StringUtils;

public class FilesystemRepositoryConnectorProxyImpl implements RepositoryConnectorProxy {

    private static final Logger LOGGER = LoggerFactory.getLogger(FilesystemRepositoryConnectorProxyImpl.class);

    private static final String ERROR_MESSAGE = "Unable to get template from the repository";

    private final String catalogue;
    private final FileSystem fileSystem;

    public FilesystemRepositoryConnectorProxyImpl(Vertx vertx, JsonObject configuration) {
        this.fileSystem = vertx.fileSystem();
        this.catalogue = configuration.getString("catalogue");
    }

    @Override
    public void process(ClientRequest request, Handler<AsyncResult<ClientResponse>> result) {
        final String localFilePath = catalogue + StringUtils.stripStart(request.getPath(), "/");
        final Optional<String> contentType = Optional.ofNullable(MimeMapping.getMimeTypeForFilename(localFilePath));

        LOGGER.trace("Fetching file `{}` from local repository.", localFilePath);

        ObservableFuture<Buffer> fileObservable = RxHelper.observableFuture();
        fileObservable
                .map(buffer -> new ClientResponse().setStatusCode(HttpResponseStatus.OK.code())
                        .setHeaders(headers(contentType)).setBody(buffer))
                .defaultIfEmpty(new ClientResponse().setStatusCode(HttpResponseStatus.NOT_FOUND.code()))
                .subscribe(response -> result.handle(Future.succeededFuture(response)), error -> {
                    LOGGER.error(ERROR_MESSAGE, error);
                    result.handle(Future.succeededFuture(processError(error)));
                });

        fileSystem.readFile(localFilePath, fileObservable.toHandler());
    }

    private MultiMap headers(Optional<String> contentType) {
        MultiMap headers = MultiMap.caseInsensitiveMultiMap();
        contentType.ifPresent(s -> headers.add("Content-Type", s));
        return headers;
    }

    private ClientResponse processError(Throwable error) {
        HttpResponseStatus statusCode;
        if (error.getCause().getClass().equals(NoSuchFileException.class)) {
            statusCode = HttpResponseStatus.NOT_FOUND;
        } else {
            statusCode = HttpResponseStatus.INTERNAL_SERVER_ERROR;
        }
        return new ClientResponse().setStatusCode(statusCode.code());
    }
}