atom.servlet.PublicStaticResourceServlet Maven / Gradle / Ivy

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package atom.servlet;

import atom.app.ActivityThread;
import atom.content.Intent;
import atom.ws.model.ContextService;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Provide access to the package public resources.
 *
 * @author Alex Voloshyn
 * @author Serge Voloshyn
 * @version 1.8 3/1/15
 */
@WebServlet("/public/*")
@Deprecated
public final class PublicStaticResourceServlet extends HttpServlet {
    /**
     * Use serialVersionUID from JDK 1.0.2 for interoperability.
     */
    private static final long serialVersionUID = 348007097595591376L;
    /**
     * Buffer size for output stream.
     */
    private static final int BUF_SIZE = 4096;

    @Override
    protected void doGet(final HttpServletRequest request,
                         final HttpServletResponse response)
            throws ServletException, IOException {
        final HttpSession session = request.getSession(true);
        final ActivityThread thread = (ActivityThread)
                session.getAttribute(ContextService.ACTIVITY_THREAD);
        if (thread == null) {
            return;
        }
        final Object activity =
                thread.getCurrentActivities().get(Intent.LAYER_DEFAULT);
        if (activity == null) {
            return;
        }
        // Class loader that used by activity propagation
        final Class cls = activity.getClass();
        final ClassLoader loader = cls.getClassLoader();

        final String uri = request.getRequestURI();
        InputStream stream;
        if ('/' == uri.charAt(0)) {
            stream = loader.getResourceAsStream(uri.substring(1, uri.length()));
        } else {
            stream = loader.getResourceAsStream(uri);
        }

        if (stream == null) {
            return;
        }

        final ServletContext context = getServletConfig().getServletContext();
        final String mimeType = context.getMimeType(uri);

        // sets response content type
        if (mimeType == null) {
            response.setContentType("application/octet-stream");
        } else {
            response.setContentType(mimeType);
        }

        // reads the file's bytes and writes them to the response stream
        final byte[] buffer = new byte[BUF_SIZE];
        int length;
        final OutputStream out = response.getOutputStream();
        while ((length = stream.read(buffer)) != -1) {
            out.write(buffer, 0, length);
        }
        stream.close();
        out.close();
    }
}