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package org.apache.directory.samples.embed.webapp;

import java.io.PrintWriter;
import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.directory.server.core.DirectoryService;
import org.apache.directory.server.core.jndi.CoreContextFactory;

/**
 * A servlet which displays the Root DSE of the embedded server.
 * 
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory
 *         Project</a>
 */
public class RootDseServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException {

        try {
            resp.setContentType("text/plain");
            PrintWriter out = resp.getWriter();

            out.println("*** ApacheDS RootDSE ***\n");

            DirContext ctx = new InitialDirContext(this.createEnv());

            SearchControls ctls = new SearchControls();
            ctls.setReturningAttributes(new String[] { "*", "+" });
            ctls.setSearchScope(SearchControls.OBJECT_SCOPE);

            NamingEnumeration<SearchResult> result = ctx.search("",
                    "(objectClass=*)", ctls);
            if (result.hasMore()) {
                SearchResult entry = (SearchResult) result.next();
                Attributes as = entry.getAttributes();

                NamingEnumeration<String> ids = as.getIDs();
                while (ids.hasMore()) {
                    String id = (String) ids.next();
                    Attribute attr = as.get(id);
                    for (int i = 0; i < attr.size(); ++i) {
                        out.println(id + ": " + attr.get(i));
                    }
                }
            }
            ctx.close();

            out.flush();
        } catch (Exception e) {
            throw new ServletException(e);
        }

    }

    /**
     * Creates an environment configuration for JNDI access.  
     */
    protected Hashtable<Object, Object> createEnv() {

        // Fetch directory servive from servlet context
        ServletContext servletContext = this.getServletContext();
        DirectoryService directoryService = (DirectoryService) servletContext
                .getAttribute(DirectoryService.JNDI_KEY);

        Hashtable<Object, Object> env = new Hashtable<Object, Object>();
        env.put(DirectoryService.JNDI_KEY, directoryService);
        env.put(Context.PROVIDER_URL, "");
        env.put(Context.INITIAL_CONTEXT_FACTORY, CoreContextFactory.class
                .getName());

        env.put(Context.SECURITY_PRINCIPAL, "uid=admin,ou=system");
        env.put(Context.SECURITY_CREDENTIALS, "secret");
        env.put(Context.SECURITY_AUTHENTICATION, "simple");

        return env;
    }
}