org.fabric3.runtime.weblogic.servlet.WebLogicServletHost Maven / Gradle / Ivy

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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.fabric3.runtime.weblogic.servlet;

import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicBoolean;

import org.fabric3.runtime.weblogic.api.Constants;
import org.fabric3.runtime.weblogic.api.ServletRequestDispatcher;
import org.fabric3.spi.host.ServletHost;
import org.oasisopen.sca.annotation.EagerInit;
import org.oasisopen.sca.annotation.Init;
import org.oasisopen.sca.annotation.Reference;
import org.oasisopen.sca.annotation.Service;

/**
 * A ServletHost implementation that forwards requests to registered servlets
 */
@SuppressWarnings("NonSerializableFieldInSerializableClass")
@Service({ServletHost.class, ServletRequestDispatcher.class})
@EagerInit
public class WebLogicServletHost extends HttpServlet implements ServletHost, ServletRequestDispatcher {
    private static final long serialVersionUID = -3784698338450289318L;
    private MBeanServer mBeanServer;
    private Map servlets = new ConcurrentHashMap<>();
    private int httpPort;
    private int httpsPort;
    private AtomicBoolean initialized = new AtomicBoolean();
    private ServletConfig config;

    public WebLogicServletHost(@Reference MBeanServer mBeanServer) {
        this.mBeanServer = mBeanServer;
    }

    @Init
    public void start() throws JMException, ServletHostInitException, MalformedURLException {
        // determine the default HTTP and HTTPS URLs 
        ObjectName serverRuntimeMBean = (ObjectName) mBeanServer.getAttribute(Constants.WLS_RUNTIME_SERVICE_MBEAN, "ServerRuntime");
        String httpUrl = (String) mBeanServer.invoke(serverRuntimeMBean, "getURL", new Object[]{"http"}, new String[]{String.class.getName()});
        if (httpUrl == null) {
            throw new ServletHostInitException("HTTP port not configured");
        }
        httpPort = new URL(httpUrl).getPort();

        String httpsUrl = (String) mBeanServer.invoke(serverRuntimeMBean, "getURL", new Object[]{"https"}, new String[]{String.class.getName()});
        if (httpsUrl == null) {
            return;
        }
        httpsPort = new URL(httpsUrl).getPort();
    }

    public String getHostType() {
        return "WebLogic";
    }

    public int getHttpPort() {
        return httpPort;
    }

    public int getHttpsPort() {
        return httpsPort;
    }

    public boolean isHttpsEnabled() {
        return true;
    }

    public URL getBaseHttpUrl() {
        try {
            // TODO return host from JNDI
            String host = InetAddress.getLocalHost().getHostAddress();
            return new URL("http://" + host + ":" + getHttpPort());
        } catch (UnknownHostException | MalformedURLException e) {
            throw new IllegalStateException(e);
        }
    }

    public URL getBaseHttpsUrl() {
        try {
            // TODO return host from JNDI
            String host = InetAddress.getLocalHost().getHostAddress();
            return new URL("https://" + host + ":" + getHttpPort());
        } catch (UnknownHostException | MalformedURLException e) {
            throw new IllegalStateException(e);
        }
    }

    public void init(ServletConfig config) throws ServletException {
        for (Servlet servlet : servlets.values()) {
            servlet.init(config);
        }
        this.config = config;
        initialized.set(true);
    }

    public void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String path = req.getPathInfo();
        if (path == null) {
            notFound(resp);
            return;
        }
        Servlet servlet = servlets.get(path);
        if (servlet == null) {
            int i;
            servlet = servlets.get(path + "/*");
            if (servlet == null) {
                while ((i = path.lastIndexOf("/")) >= 0) {
                    servlet = servlets.get(path.substring(0, i) + "/*");
                    if (servlet != null) {
                        break;
                    }
                    path = path.substring(0, i);
                }
            }
            if (servlet == null) {
                notFound(resp);
                return;
            }
        }
        servlet.service(req, resp);
    }

    public void registerMapping(String path, Servlet servlet) {
        if (servlets.containsKey(path)) {
            throw new IllegalStateException("Servlet already registered at path: " + path);
        }
        if (initialized.get()) {
            // initialization done previously, initialize this servlet now
            try {
                servlet.init(config);
            } catch (ServletException e) {
                log("Error initializing servlet for path: " + path, e);
            }
        }
        servlets.put(path, servlet);
    }

    public boolean isMappingRegistered(String mapping) {
        return servlets.containsKey(mapping);

    }

    public Servlet unregisterMapping(String path) {
        return servlets.remove(path);
    }

    private void notFound(HttpServletResponse resp) throws IOException {
        resp.setStatus(HttpServletResponse.SC_NOT_FOUND);
        PrintWriter writer = resp.getWriter();
        writer.print("Resource not found");
        writer.close();
    }

}