i2p.i2p/apps/routerconsole/java/src/net/i2p/router/web/WebAppStarter.java

package net.i2p.router.web;

import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.Properties;
import java.util.StringTokenizer;

import net.i2p.I2PAppContext;

import org.mortbay.http.HttpContext;
import org.mortbay.http.HttpListener;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.servlet.WebApplicationContext;


/**
 *  Add, start or stop a webapp.
 *  Add to the webapp classpath if specified in webapps.config.
 *
 *  Sadly, setting Class-Path in MANIFEST.MF doesn't work for jetty wars.
 *  See WebAppConfiguration for more information.
 *  but let's just do it in webapps.config.
 *
 *  No, wac.addClassPath() does not work. For more info see:
 *
 *  http://servlets.com/archive/servlet/ReadMsg?msgId=511113&listName=jetty-support
 *
 *  @since 0.7.12
 *  @author zzz
 */
public class WebAppStarter {

    /**
     *  adds and starts
     *  @throws just about anything, caller would be wise to catch Throwable
     */
    static void startWebApp(I2PAppContext ctx, Server server, String appName, String warPath) throws Exception {
         File tmpdir = new File(ctx.getTempDir(), "jetty-work-" + appName + ctx.random().nextInt());
         WebApplicationContext wac = addWebApp(ctx, server, appName, warPath, tmpdir);
         wac.start();
    }

    /**
     *  add but don't start
     *  This is used only by RouterConsoleRunner, which adds all the webapps first
     *  and then starts all at once.
     */
    static WebApplicationContext addWebApp(I2PAppContext ctx, Server server, String appName, String warPath, File tmpdir) throws IOException {

        // Jetty will happily load one context on top of another without stopping
        // the first one, so we remove any previous one here
        try {
            stopWebApp(server, appName);
        } catch (Throwable t) {}

        WebApplicationContext wac = server.addWebApplication("/"+ appName, warPath);
        tmpdir.mkdir();
        wac.setTempDirectory(tmpdir);

        // this does the passwords...
        RouterConsoleRunner.initialize(wac);

        // see WebAppConfiguration for info
        String[] classNames = server.getWebApplicationConfigurationClassNames();
        String[] newClassNames = new String[classNames.length + 1];
        for (int j = 0; j < classNames.length; j++)
             newClassNames[j] = classNames[j];
        newClassNames[classNames.length] = WebAppConfiguration.class.getName();
        wac.setConfigurationClassNames(newClassNames);
        return wac;
    }

    /**
     *  stop it and remove the context
     *  @throws just about anything, caller would be wise to catch Throwable
     */
    static void stopWebApp(Server server, String appName) {
        // this will return a new context if one does not exist
        HttpContext wac = server.getContext('/' + appName);
        try {
            // false -> not graceful
            wac.stop(false);
        } catch (InterruptedException ie) {}
        try {
            server.removeContext(wac);
        } catch (IllegalStateException ise) {}
    }

    static boolean isWebAppRunning(String appName) {
        Server server = WebAppStarter.getConsoleServer();
        // this will return a new context if one does not exist
        HttpContext wac = server.getContext('/' + appName);
        return wac.isStarted();
    }
    
    /** see comments in ConfigClientsHandler */
    static Server getConsoleServer() {
        Collection c = Server.getHttpServers();
        for (int i = 0; i < c.size(); i++) {
            Server s = (Server) c.toArray()[i];
            HttpListener[] hl = s.getListeners();
            for (int j = 0; j < hl.length; j++) {
                if (hl[j].getPort() == 7657)
                    return s;
            }
        }
        return null;
    }
}