I am working with embedded Jetty and I want to add a servlet filter to check for authentication before each request. I tried following this example but it looks like the signature has changed.
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-server</artifactId>
<version>9.0.4.v20130625</version>
</dependency>
My Jetty starter looks like this:
public class JettyStarter {
public static void main( final String[] args ) throws Exception {
Server server = new Server(8080);
final ServletHolder servletHolder = new ServletHolder(new CXFServlet());
final ServletContextHandler context = new ServletContextHandler();
context.setContextPath("/");
// context.addFilter(AuthenticationFilter.class, "/*", FilterMapping.REQUEST);
context.addServlet(servletHolder, "/platform/*");
context.addEventListener(new ContextLoaderListener());
context.setInitParameter("contextClass", AnnotationConfigWebApplicationContext.class.getName());
context.setInitParameter("contextConfigLocation", Config.class.getName());
server.setHandler(context);
server.start();
server.join();
}
}
When I uncomment the line
// context.addFilter(AuthenticationFilter.class, "/*", FilterMapping.REQUEST);
I find that the signature has changed. So I want to take a small step back and ask, with embedded Jetty, how do I add a filter that runs at the beginning of the request and allows the request to continue only if some condition is met?
The beginning of the AuthenticationFilter class looks like this:
import javax.servlet.*;
import java.io.IOException;
public class AuthenticationFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {}
@Override
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse,
FilterChain filterChain) throws IOException, ServletException {}
@Override
public void destroy() {}
}
You are probably looking for EnumSet.of(DispatcherType.REQUEST)
, included a full example below:
import java.io.IOException;
import java.util.EnumSet;
import javax.servlet.DispatcherType;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletHandler;
public class JettyFilter {
public static void main(final String[] args) throws Exception {
Server server = new Server(8080);
ServletHandler handler = new ServletHandler();
server.setHandler(handler);
handler.addServletWithMapping(HelloServlet.class, "/*");
handler.addFilterWithMapping(HelloPrintingFilter.class, "/*",
EnumSet.of(DispatcherType.REQUEST));
server.start();
server.join();
}
public static class HelloServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println("<h1>Hello SimpleServlet</h1>");
}
}
public static class HelloPrintingFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
System.out.print("hello from filter");
}
@Override
public void init(FilterConfig arg0) throws ServletException {
}
@Override
public void destroy() {}
}
}