/*
 * Copyright (c) 2003-2008, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.http;

import java.io.IOException;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;
import java.util.Vector;

import org.osgi.service.cm.ConfigurationException;

public class HttpConfig {

    // public constants

    public final static String HTTP_PORT_KEY = "port.http";

    public final static String HTTPS_PORT_KEY = "port.https";

    public final static String HOST_KEY = "host";

    public final static String MIME_PROPS_KEY = "mime.map";

    public final static String SESSION_TIMEOUT_KEY = "session.timeout.default";

    public final static String CONNECTION_TIMEOUT_KEY = "connection.timeout";

    public final static String CONNECTION_MAX_KEY = "connection.max";

    public final static String DNS_LOOKUP_KEY = "dns.lookup";

    public final static String RESPONSE_BUFFER_SIZE_DEFAULT_KEY = "response.buffer.size.default";

    public final static String SERVICE_RANKING_KEY = "service.ranking";

    public final static String HTTP_ENABLED_KEY = "http.enabled";

    public final static String HTTPS_ENABLED_KEY = "https.enabled";

    public final static String REQ_CLIENT_AUTH_KEY = "req.client.auth";

    private static final int HTTP_PORT_DEFAULT = 80;

    private static final int HTTPS_PORT_DEFAULT = 443;

    public final static String DEFAULT_CHAR_ENCODING_KEY = "org.knopflerfish.http.encoding.default";

    //
    public HttpConfigWrapper HTTP = new HttpConfigWrapper(false, this);

    public HttpConfigWrapper HTTPS = new HttpConfigWrapper(true, this);

    // private fields

    private Dictionary configuration;

    private int httpPort = HTTP_PORT_DEFAULT;

    private int httpsPort = HTTPS_PORT_DEFAULT;

    private String host = "";

    private final Hashtable mimeMap = new Hashtable();

    private int defaultSessionTimeout = 1200;

    private int connectionTimeout = 30;

    private int connectionMax = 50;

    private boolean dnsLookup = true;

    private int defaultResponseBufferSize = 16384;

    // private int serviceRanking = 1000; // NYI
    private boolean httpsEnabled = true;

    private boolean httpEnabled = true;

    private String defaultCharEncoding = "ISO-8859-1";

    private boolean requireClientAuth = false;

    // constructors

    public HttpConfig() throws ConfigurationException {
        this(null);
    }

    public HttpConfig(Dictionary configuration) throws ConfigurationException {

        this.configuration = HttpConfig.getDefaultConfig();

        updated(configuration);
    }

    // public methods

    public static Dictionary getDefaultConfig() {

        final Dictionary config = new Hashtable();

        config.put(HttpConfig.HTTP_ENABLED_KEY, Boolean.valueOf(System
                .getProperty("org.knopflerfish.http.enabled", "true")));
        config.put(HttpConfig.HTTPS_ENABLED_KEY, Boolean.valueOf(System
                .getProperty("org.knopflerfish.http.secure.enabled", "true")));

        config.put(HttpConfig.HTTP_PORT_KEY, Integer.getInteger(
                "org.osgi.service.http.port", HTTP_PORT_DEFAULT));
        config.put(HttpConfig.HTTPS_PORT_KEY, Integer.getInteger(
                "org.osgi.service.http.secure.port", HTTPS_PORT_DEFAULT));
        config.put(HttpConfig.HOST_KEY,
                   System.getProperty("org.osgi.service.http.hostname", ""));

        Properties mimeProps = new Properties();
        try {
            mimeProps.load(HttpConfig.class
                    .getResourceAsStream("/mime.default"));
            String propurl = System.getProperty(
                    "org.knopflerfish.http.mime.props", "");
            if (propurl.length() > 0) {
                URL url = new URL(propurl);
                Properties userMimeProps = new Properties();
                userMimeProps.load(url.openStream());
                Enumeration e = userMimeProps.keys();
                while (e.hasMoreElements()) {
                    String key = (String) e.nextElement();
                    mimeProps.put(key, userMimeProps.getProperty(key));
                }
            }
        } catch (MalformedURLException ignore) {
        } catch (IOException ignore) {
        }
        Vector mimeVector = new Vector(mimeProps.size());
        Enumeration e = mimeProps.keys();
        while (e.hasMoreElements()) {
            String key = (String) e.nextElement();
            mimeVector.addElement(new String[] { key,
                    mimeProps.getProperty(key) });
        }
        config.put(HttpConfig.MIME_PROPS_KEY, mimeVector);

        config.put(HttpConfig.SESSION_TIMEOUT_KEY, Integer.getInteger(
                "org.knopflerfish.http.session.timeout.default", 1200));

        config.put(HttpConfig.CONNECTION_TIMEOUT_KEY, Integer.getInteger(
                "org.knopflerfish.http.connection.timeout", 30));
        config.put(HttpConfig.CONNECTION_MAX_KEY, Integer.getInteger(
                "org.knopflerfish.http.connection.max", 50));

        config.put(HttpConfig.DNS_LOOKUP_KEY, Boolean.valueOf(System
                .getProperty("org.knopflerfish.http.dnslookup", "false")));
        config.put(HttpConfig.RESPONSE_BUFFER_SIZE_DEFAULT_KEY, Integer
                .getInteger(
                        "org.knopflerfish.http.response.buffer.size.default",
                        16384));

        config.put(HttpConfig.DEFAULT_CHAR_ENCODING_KEY, System.getProperty(
                HttpConfig.DEFAULT_CHAR_ENCODING_KEY, "ISO-8859-1"));

        config
                .put(HttpConfig.REQ_CLIENT_AUTH_KEY, Boolean.valueOf(System
                        .getProperty("org.knopflerfish.http.req.client.auth",
                                "false")));

        return config;
    }

    public void mergeConfiguration(Dictionary configuration)
            throws ConfigurationException {

        if (configuration == null)
            return;

        Enumeration e = configuration.keys();
        while (e.hasMoreElements()) {
            String key = (String) e.nextElement();
            Object value = configuration.get(key);
            try {
                if (key.equals(HTTP_PORT_KEY)) {
                    httpPort = ((Integer) value).intValue();
                    this.configuration.put(key, value);
                } else if (key.equals(HTTPS_PORT_KEY)) {
                    httpsPort = ((Integer) value).intValue();
                    this.configuration.put(key, value);
                } else if (key.equals(HOST_KEY)) {
                    host = (String) value;
                    this.configuration.put(key, value);
                } else if (key.equals(MIME_PROPS_KEY)) {
                    Enumeration pairs = ((Vector) value).elements();
                    while (pairs.hasMoreElements()) {
                        Object o = pairs.nextElement();
                        if (o instanceof Object[]) {
                            Object[] pair = (Object[]) o;
                            mimeMap.put(pair[0], pair[1]);
                        } else if (o instanceof Vector) {
                            Vector pair = (Vector) o;
                            mimeMap.put(pair.elementAt(0), pair.elementAt(1));
                        }
                    }
                    this.configuration.put(key, value);
                } else if (key.equals(SESSION_TIMEOUT_KEY)) {
                    defaultSessionTimeout = ((Integer) value).intValue();
                    this.configuration.put(key, value);
                } else if (key.equals(CONNECTION_TIMEOUT_KEY)) {
                    connectionTimeout = ((Integer) value).intValue();
                    this.configuration.put(key, value);
                } else if (key.equals(CONNECTION_MAX_KEY)) {
                    connectionMax = ((Integer) value).intValue();
                    this.configuration.put(key, value);
                } else if (key.equals(DNS_LOOKUP_KEY)) {
                    dnsLookup = ((Boolean) value).booleanValue();
                    this.configuration.put(key, value);
                } else if (key.equals(RESPONSE_BUFFER_SIZE_DEFAULT_KEY)) {
                    defaultResponseBufferSize = ((Integer) value).intValue();
                    this.configuration.put(key, value);
                } else if (key.equals(SERVICE_RANKING_KEY)) {
                    // serviceRanking = ((Integer) value).intValue();
                    this.configuration.put(key, value);
                } else if (key.equals(HTTP_ENABLED_KEY)) {
                    this.httpEnabled = ((Boolean) value).booleanValue();
                    this.configuration.put(key, value);
                } else if (key.equals(HTTPS_ENABLED_KEY)) {
                    this.httpsEnabled = ((Boolean) value).booleanValue();
                    this.configuration.put(key, value);
                } else if (key.equals(DEFAULT_CHAR_ENCODING_KEY)) {
                    this.defaultCharEncoding = (String) value;
                    this.configuration.put(key, value);
                } else if (key.equals(REQ_CLIENT_AUTH_KEY)) {
                    this.requireClientAuth = ((Boolean) value).booleanValue();
                    this.configuration.put(key, value);
                } else
                    this.configuration.put(key, value);
            } catch (IndexOutOfBoundsException ioobe) {
                throw new ConfigurationException(key, "Wrong type");
            } catch (ClassCastException cce) {
                throw new ConfigurationException(key, "Wrong type: "
                        + value.getClass().getName());
            }
        }
    }

    public Dictionary getConfiguration() {
        return configuration;
    }

    public int getMaxConnections() {
        return connectionMax;
    }

    public String getServerInfo() {
        return "The Knopflerfish HTTP Server"; // NYI
    }

    public String getMimeType(String file) {

        String mimeType = null;

        int index = file.lastIndexOf('.');
        if (index != -1)
            mimeType = (String) mimeMap.get(file.substring(index + 1));

        return mimeType;
    }

    public int getDefaultSessionTimeout() {
        return defaultSessionTimeout; // NYI
    }

    public int getDefaultBufferSize() {
        return defaultResponseBufferSize; // NYI
    }

    public int getConnectionTimeout() {
        return connectionTimeout;
    }

    public boolean isHttpEnabled() {
        return httpEnabled;
    }

    public boolean isHttpsEnabled() {
        return httpsEnabled;
    }

    public String getHost() {
        return host;
    }

    public int getHttpPort() {
        return httpPort;
    }

    public int getHttpsPort() {
        return httpsPort;
    }

    public void setHttpPort(int port) {
        this.httpPort = port;
        configuration.put(HTTP_PORT_KEY, new Integer(port));
    }

    public void setHttpsPort(int port) {
        this.httpsPort = port;
        configuration.put(HTTPS_PORT_KEY, new Integer(port));
    }

    public boolean getDNSLookup() {
        return dnsLookup;
    }

    public boolean requireClientAuth() {
        return requireClientAuth;
    }

    public String getDefaultCharacterEncoding() {
        return defaultCharEncoding;
    }

    public void updated(Dictionary configuration) throws ConfigurationException {
        mergeConfiguration(configuration); // NYI
    }

} // HttpConfig