eu.uqasar.web.upload.FileUploadUtil.java Source code

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Here is the source code for eu.uqasar.web.upload.FileUploadUtil.java

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/*
 */
package eu.uqasar.web.upload;

/*
 * #%L
 * U-QASAR
 * %%
 * Copyright (C) 2012 - 2015 U-QASAR Consortium
 * %%
 * 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.
 * #L%
 */

import eu.uqasar.model.user.User;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.UUID;

import lombok.AccessLevel;
import lombok.Getter;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.tika.detect.Detector;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AutoDetectParser;
import org.apache.wicket.markup.html.form.upload.FileUpload;
import org.jboss.solder.logging.Logger;

/**
 *
 *
 */
@Getter(AccessLevel.PRIVATE)
public class FileUploadUtil {

    private static final Logger logger = Logger.getLogger(FileUploadHelper.class);
    @Getter(AccessLevel.PRIVATE)
    private static String uploadFolderBasePath;

    private static Path getUserUploadFolder(User user) throws IOException {
        String userId = "default";
        if (user != null) {
            userId = String.valueOf(user.getId());
        }
        Path path = FileSystems.getDefault().getPath(getUploadFolderBasePath(), userId);
        if (!Files.exists(path)) {
            Files.createDirectories(path);
        }
        return path;
    }

    public static Path getBaseUploadFolder() throws IOException {
        Path basePath = FileSystems.getDefault().getPath(getUploadFolderBasePath());
        if (!Files.exists(basePath)) {
            Files.createDirectories(basePath);
        }
        return basePath;
    }

    static Path getUserProfilePicturesUploadFolder() throws IOException {
        Path basePath = FileSystems.getDefault().getPath(getUploadFolderBasePath(), "userprofiles");
        if (!Files.exists(basePath)) {
            Files.createDirectories(basePath);
        }
        return basePath;
    }

    private static MediaType getMimeType(InputStream stream, Metadata md) throws IOException {
        MediaType mediaType;
        try (BufferedInputStream bis = new BufferedInputStream(stream)) {
            AutoDetectParser parser = new AutoDetectParser();
            Detector detector = parser.getDetector();
            mediaType = detector.detect(bis, md);
        }
        return mediaType;
    }

    Path getNewFileName(FileUpload file, User user, boolean overwrite) throws IOException {
        Path target;
        String uploadedFileFileName = file.getClientFileName();
        if (overwrite) {
            target = FileSystems.getDefault().getPath(getUserUploadFolder(user).toString(), uploadedFileFileName);
        } else {
            final String extensionPart = FilenameUtils.getExtension(uploadedFileFileName);
            final String extension = StringUtils.isEmpty(extensionPart) ? "" : "." + extensionPart;
            // we add a dot (".") before the UUID, so +1
            final int UUID_LENGTH = 1 + 36;
            // extension length is given out of extension length + the dot (".txt" == 4, no extension == 0)
            final int EXTENSION_LENGTH = extension.length();
            // MAX file name length is 255 - UUID part - Extension part
            final int MAX_BASE_FILENAME_LENGTH = 255 - UUID_LENGTH - EXTENSION_LENGTH;
            // shorten file name to no longer than max length, calculated above
            final String fileNameWithoutExtension = StringUtils
                    .left(FilenameUtils.getBaseName(uploadedFileFileName), MAX_BASE_FILENAME_LENGTH);
            // generate new file name out of shortened base name + "." + UUID + any extension (including ".")
            final String targetFileName = String.format("%s.%s%s", fileNameWithoutExtension,
                    UUID.randomUUID().toString(), extension);
            target = FileSystems.getDefault().getPath(getUserUploadFolder(user).toString(), targetFileName);
        }
        return target;
    }

    public static MediaType getMimeType(FileUpload upload) throws IOException {
        return getMimeType(upload.getInputStream());
    }

    private static MediaType getMimeType(InputStream stream) throws IOException {
        return getMimeType(stream, new Metadata());
    }

    public static MediaType getMimeType(File file) throws IOException {
        Metadata md = new Metadata();
        md.add(Metadata.RESOURCE_NAME_KEY, file.getAbsolutePath());
        return getMimeType(new FileInputStream(file), md);
    }
}