onl.area51.fileserver.FileServer.java Source code

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Here is the source code for onl.area51.fileserver.FileServer.java

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/*
 * Copyright 2016 peter.
 *
 * 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 onl.area51.fileserver;

import java.io.IOException;
import java.net.URISyntaxException;
import java.nio.file.FileSystem;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.enterprise.context.Dependent;
import javax.enterprise.event.Observes;
import onl.area51.filesystem.http.server.FileSystemFactory;
import onl.area51.httpd.HttpRequestHandlerBuilder;
import onl.area51.httpd.action.ActionRegistry;
import onl.area51.filesystem.http.server.SaveContentAction;
import onl.area51.httpd.util.PathEntity;
import org.apache.http.HttpStatus;
import uk.trainwatch.util.Functions;
import uk.trainwatch.util.config.Configuration;
import uk.trainwatch.util.config.ConfigurationService;

@Dependent
public class FileServer {

    private static final Logger LOG = Logger.getLogger("FileServer");

    /**
     * Instantiate this bean on startup.
     *
     * @param registry
     * @param configurationService
     */
    public void deploy(@Observes ActionRegistry registry, ConfigurationService configurationService) {
        Configuration mainConfig = configurationService.getConfiguration("fileserver");

        LOG.log(Level.INFO, "Mounting filesystems");

        Configuration fileSystemConfig = mainConfig.getConfiguration("filesystem");

        mainConfig
                .collection("filesystems").map(Functions.castTo(String.class)).map(n -> fileSystemConfig
                        .getConfiguration(n, () -> configurationService.getConfiguration("filesystem_" + n)))
                .forEach(fs -> {
                    String prefix = FileSystemFactory.getPrefix(fs);

                    LOG.log(Level.INFO, () -> "Registring filesystem " + prefix);

                    try {
                        FileSystem fileSystem = FileSystemFactory.getFileSystem(fs);

                        registry.registerHandler(prefix + "*", HttpRequestHandlerBuilder.create().unscoped().log()
                                // Normal GET requests
                                .method("GET").add(FileSystemFactory.extractPath(fileSystem))
                                .ifAttributePresentSendOk("path", PathEntity::create)
                                .ifAttributeAbsentSendError("path", HttpStatus.SC_NOT_FOUND).end()
                                // HEAD requests
                                .method("HEAD").add(FileSystemFactory.extractPath(fileSystem))
                                .ifAttributePresentSendOk("path", PathEntity::createSizeOnly)
                                .ifAttributeAbsentSendError("path", HttpStatus.SC_NOT_FOUND).end()
                                // POST
                                .method("PUT").add(FileSystemFactory.extractPathMayNotExist(fileSystem))
                                .ifAttributePresent("path", new SaveContentAction())
                                .ifAttributeAbsentSendError("path", HttpStatus.SC_NOT_FOUND).end()
                                //
                                .build());
                    } catch (IOException | URISyntaxException ex) {
                        LOG.log(Level.SEVERE, ex, () -> "Failed to register " + prefix);
                    }
                });
    }
}