DocsSparkApplication.java

/**
 * Copyright (c) Codice Foundation
 * <p>
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 * <p>
 * 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
 * Lesser General Public License for more details. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */

package org.codice.ui.admin.docs;

import static spark.Spark.get;
import static spark.Spark.staticFiles;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Collection;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.filefilter.NameFileFilter;
import org.apache.commons.io.filefilter.TrueFileFilter;

import spark.servlet.SparkApplication;

public class DocsSparkApplication implements SparkApplication {

    public static final String DOCS_ROOT_DIR = Paths.get(System.getProperty("karaf.home"),
            "documentation")
            .toString();
    @Override
    public void init() {

        File docHtml = getDocumentationHtml();

        if (docHtml != null) {
            staticFiles.externalLocation(docHtml.getParent());
        }

        get("/*",
                (req, res) -> getClass().getClassLoader()
                        .getResourceAsStream("/404.html"));
    }

    public File getDocumentationHtml() {

        if (!Files.exists(Paths.get(DOCS_ROOT_DIR))) {
            return null;
        }

        Collection<File> files = FileUtils.listFiles(new File(DOCS_ROOT_DIR),
                new NameFileFilter("documentation.html"),
                TrueFileFilter.INSTANCE);

        if (files.isEmpty()) {
            return null;
        }

        return files.iterator()
                .next()
                .getAbsoluteFile();
    }
}