org.msjs.servlet.FileServlet.java Source code

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Here is the source code for org.msjs.servlet.FileServlet.java

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/*
 * Copyright (c) 2010 Sharegrove Inc.
 *
 * 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 org.msjs.servlet;

import com.google.inject.Injector;
import org.apache.commons.io.IOUtils;
import org.msjs.config.MsjsConfiguration;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class FileServlet extends ResourceServlet {

    private ServletContext context;
    private String fileRoot;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        context = config.getServletContext();
        Injector injector = (Injector) context.getAttribute(ServletListener.INJECTOR);
        fileRoot = injector.getInstance(MsjsConfiguration.class).getScriptRoot();
    }

    @Override
    protected void handleRequest(final HttpServletRequest request, final HttpServletResponse response)
            throws IOException {
        final String contentType = context.getMimeType(getFilePath(request));
        if (contentType != null)
            response.setHeader("Content-Type", contentType);
        IOUtils.copy(getInputStream(request), response.getOutputStream());
    }

    private InputStream getInputStream(final HttpServletRequest request) throws IOException {
        final File file = getFile(request);
        if (file.exists())
            return new FileInputStream(file);

        String resourcePath = request.getPathInfo();
        try {
            final URL url = FileServlet.class.getResource(resourcePath);
            if (url == null)
                throw new IOException(resourcePath);
            URLConnection connection = url.openConnection();
            return connection.getInputStream();
        } catch (IOException e) {
            throw new FileNotFoundException(resourcePath);
        }

    }

    @Override
    public long getLastModified(final HttpServletRequest request) {
        return getFile(request).lastModified();
    }

    private File getFile(HttpServletRequest request) {
        return new File(getFilePath(request));
    }

    private String getFilePath(final HttpServletRequest request) {
        return fileRoot + request.getPathInfo();
    }

}