org.bonitasoft.console.common.server.page.CustomPageDependenciesResolver.java Source code

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Here is the source code for org.bonitasoft.console.common.server.page.CustomPageDependenciesResolver.java

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/**
 * Copyright (C) 2015 BonitaSoft S.A.
 * BonitaSoft, 32 rue Gustave Eiffel - 38000 Grenoble
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2.0 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.bonitasoft.console.common.server.page;

import static org.apache.commons.io.FileUtils.readFileToByteArray;

import java.io.File;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.apache.commons.io.FileUtils;
import org.bonitasoft.console.common.server.preferences.constants.WebBonitaConstantsUtils;

public class CustomPageDependenciesResolver {

    private static final String LIB_FOLDER_NAME = "lib";

    static final Map<String, File> PAGES_LIB_TMPDIR = new HashMap<>();

    private static final Logger LOGGER = Logger.getLogger(CustomPageDependenciesResolver.class.getName());

    private File libTempFolder;

    private final WebBonitaConstantsUtils webBonitaConstantsUtils;

    private final File pageDirectory;

    private final String pageName;

    public CustomPageDependenciesResolver(final String pageName, final File pageDirectory,
            final WebBonitaConstantsUtils webBonitaConstantsUtils) {
        this.pageName = pageName;
        this.pageDirectory = pageDirectory;
        this.webBonitaConstantsUtils = webBonitaConstantsUtils;
    }

    public Map<String, byte[]> resolveCustomPageDependencies() {
        final File customPageLibDirectory = new File(pageDirectory, LIB_FOLDER_NAME);
        if (customPageLibDirectory.exists()) {
            this.libTempFolder = new File(this.webBonitaConstantsUtils.getTempFolder(),
                    pageName + Long.toString(new Date().getTime()));
            if (!this.libTempFolder.exists()) {
                this.libTempFolder.mkdirs();
            }
            removePageLibTempFolder(pageName);
            PAGES_LIB_TMPDIR.put(pageName, this.libTempFolder);
            return loadLibraries(customPageLibDirectory);
        }
        return Collections.emptyMap();
    }

    private Map<String, byte[]> loadLibraries(final File customPageLibDirectory) {
        final Map<String, byte[]> result = new HashMap<String, byte[]>();
        try {
            Files.walkFileTree(customPageLibDirectory.toPath(), new SimpleFileVisitor<Path>() {

                @Override
                public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs)
                        throws IOException {
                    final File currentFile = file.toFile();
                    result.put(currentFile.getName(), readFileToByteArray(currentFile));
                    return super.visitFile(file, attrs);
                }

            });
        } catch (final IOException e) {
            LOGGER.log(Level.SEVERE, e.getMessage(), e);
        }
        return result;
    }

    public static File removePageLibTempFolder(final String pageName) {
        final File libTempFolder = PAGES_LIB_TMPDIR.remove(pageName);
        if (libTempFolder != null) {
            try {
                FileUtils.deleteDirectory(libTempFolder);
            } catch (final IOException e) {
                if (LOGGER.isLoggable(Level.WARNING)) {
                    LOGGER.log(Level.WARNING, "The custom page temporary lib directory " + libTempFolder.getPath()
                            + " cannot be deleted. This is likely to be due to a JDK bug on Windows. You can safely delete it after a server restart.");
                }
            }
        }
        return libTempFolder;
    }

    public File getTempFolder() {
        if (libTempFolder == null) {
            throw new IllegalStateException("Custom page dependencies must be resolved first.");
        }
        return libTempFolder;
    }

}