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/*
 * Copyright (c) 2024 Contributors to the Eclipse Foundation.
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.enterprise.admin.util;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Base64;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;

import static java.nio.charset.StandardCharsets.UTF_8;

public final class HttpConnectorAddress {
    static final String HTTP_CONNECTOR = "http";
    static final String HTTPS_CONNECTOR = "https";
    public static final String AUTHORIZATION_KEY = "Authorization";
    private static final String AUTHORIZATION_TYPE = "Basic ";

    private String host;
    private int port;
    private String path;
    private boolean secure;
    private AuthenticationInfo authInfo;
    private boolean interactive = true;

    private SSLSocketFactory sslSocketFactory;

    public HttpConnectorAddress() {
    }

    public HttpConnectorAddress(String host, int port) {
        this(host, port, false);
    }

    /**
     * construct an address which indicates the host, port and security attributes desired.
     *
     * @param host a host address
     * @param port a port number
     * @param secure a boolean indication of whether the connection should be secure (i.e. confidential) or not
     */
    public HttpConnectorAddress(String host, int port, boolean secure) {
        this(host, port, secure, null);
    }

    public HttpConnectorAddress(String host, int port, boolean secure, String path) {
        this(host, port, secure, path, null);
    }

    public HttpConnectorAddress(String host, int port, SSLSocketFactory sslSocketFactory) {
        this(host, port, true /* secure */, null /* path */, sslSocketFactory);
    }

    public HttpConnectorAddress(String host, int port, boolean secure, String path, SSLSocketFactory sslSocketFactory) {
        this.host = host;
        this.port = port;
        this.secure = secure;
        this.path = path;
        this.sslSocketFactory = sslSocketFactory;
    }

    /**
     * Open a connection using the reciever and the given path
     *
     * @param path the path to the required resource (path here is the portion after the hostname:port portion
     * of a URL)
     * @return a connection to the required resource. The connection returned may be a sub-class of
     * URLConnection including HttpsURLConnection. If the sub-class is a
     * HttpsURLConnection then this connection will accept any certificate from any server where the server's
     * name matches the host name of this object. Specifically we allows the certificate not to contain the name of
     * the server. This is a potential security hole, but is also a usability enhancement.
     * @throws IOException if there's a problem in connecting to the resource
     */
    public URLConnection openConnection(String path) throws IOException {
        if (path == null || path.isBlank()) {
            path = this.path;
        }
        final URLConnection cnx = this.openConnection(this.toURL(path));
        if (!(cnx instanceof HttpsURLConnection)) {
            return cnx;
        }

        configureSSL((HttpsURLConnection) cnx);

        return cnx;
    }

    private void configureSSL(final HttpsURLConnection httpsCnx) throws IOException {
        httpsCnx.setHostnameVerifier(new BasicHostnameVerifier(this.host));
        httpsCnx.setSSLSocketFactory(getOrCreateSSLSocketFactory());
    }

    private synchronized SSLSocketFactory getOrCreateSSLSocketFactory() throws IOException {
        /*
         * The SSL socket factory will have been assigned a value if this
         * connection was made from the DAS or an instance...that code would have
         * used the constructor which accepts an SSLSocketFactory as an argument.
         * (That socket factory should provide client authentication.)
         *
         * If that value is null then this connection is originating from
         * somewhere else - such as asadmin - and the socket factory should be
         * the one which uses SSL but does not provide client auth.
         */
        if (sslSocketFactory == null) {
            sslSocketFactory = createAdminSSLSocketFactory(null, null);
        }
        return sslSocketFactory;
    }

    private SSLSocketFactory createAdminSSLSocketFactory(String alias, String protocol) {
        try {
            if (protocol == null) {
                protocol = "TLS";
            }
            SSLContext cntxt = SSLContext.getInstance(protocol);
            /*
             * Pass null for the array of KeyManagers.  That uses the default
             * ones, so if the user has loaded client keys into the standard
             * Java SE keystore they will be found.
             */
            AsadminTrustManager atm = new AsadminTrustManager();
            atm.setInteractive(interactive);
            cntxt.init(null, new TrustManager[] { atm }, null);

            return cntxt.getSocketFactory();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * get the protocol prefix to be used for a connection for the receiver
     *
     * @return the protocol prefix - one of http or https depending upon the security setting.
     */
    public String getConnectorType() {
        return this.isSecure() ? HTTPS_CONNECTOR : HTTP_CONNECTOR;
    }

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    public String getPath() {
        return path == null ? "/" : path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public AuthenticationInfo getAuthenticationInfo() {
        return authInfo;
    }

    public void setAuthenticationInfo(AuthenticationInfo authInfo) {
        this.authInfo = authInfo;
    }

    /**
     * Set the security attribute
     */
    public void setSecure(boolean secure) {
        this.secure = secure;
    }

    /**
     * Indicate if the receiver represents a secure address
     */
    public boolean isSecure() {
        return secure;
    }

    /**
     * Set the interactive mode for the connection.
     */
    public void setInteractive(boolean mode) {
        interactive = mode;
    }

    public URL toURL(String path) throws MalformedURLException {
        return new URL(getConnectorType(), getHost(), getPort(), path == null ? "" : path);
    }

    public synchronized SSLSocketFactory getSSLSocketFactory() {
        return sslSocketFactory;
    }

    private String getUser() {
        return authInfo != null ? authInfo.getUser() : "";
    }

    private char[] getPassword() {
        return authInfo != null ? authInfo.getPassword() : "".toCharArray();
    }

    private URLConnection openConnection(URL url) throws IOException {
        return this.setOptions(this.makeConnection(url));
    }

    private URLConnection makeConnection(URL url) throws IOException {
        return (url.openConnection());
    }

    private URLConnection setOptions(URLConnection uc) {
        uc.setDoOutput(true);
        uc.setUseCaches(false);
        //uc.setRequestProperty("Content-type", "application/octet-stream");
        uc.setRequestProperty("Connection", "Keep-Alive");
        return this.setAuthentication(uc);
    }

    private URLConnection setAuthentication(URLConnection uc) {
        if (authInfo != null) {
            uc.setRequestProperty(AUTHORIZATION_KEY, this.getBasicAuthString());
        }
        return uc;
    }

    public String getBasicAuthString() {
        String user = this.getUser();
        String pass = this.getPassword() == null ? null : new String(this.getPassword());
        String up = user == null ? "" : user;
        String pp = pass == null ? "" : pass;
        String cs = up + ":" + pp;
        String enc = Base64.getEncoder().encodeToString(cs.getBytes(UTF_8));
        return AUTHORIZATION_TYPE + enc;
    }

    public static class BasicHostnameVerifier implements HostnameVerifier {
        private final String host;

        public BasicHostnameVerifier(String host) {
            if (host == null) {
                throw new IllegalArgumentException("null host");
            }
            this.host = host;
        }

        @Override
        public boolean verify(String s, SSLSession sslSession) {
            return host.equals(s);
        }
    }
}




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