/*
 * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 8208279
 * @summary If DNS name resolution is configured normally for SWAN on the local
 *          machine, construct a context using the configured servers and verify
 *          that a PROVIDER_URL property is generated for the context.
 *          If DNS is not configured, or if JDK version is earlier than 1.4.1,
 *          then this test is a no-op (it passes without doing anything).
 * @modules jdk.naming.dns/com.sun.jndi.dns
 *          java.base/sun.security.util
 * @library ../lib/
 * @run main ProviderUrlGen
 */

import javax.naming.Context;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import java.util.Hashtable;

public class ProviderUrlGen {

    public static void main(String[] args) throws Exception {
        Hashtable<Object, Object> env;

        // initialize test
        env = DNSTestUtils.initEnv(false, ProviderUrlGen.class.getName(), args);

        env.remove(Context.PROVIDER_URL);

        DirContext ctx = null;

        try {
            if (!isPlatformServersAvailable()) {
                System.out.println(
                        "DNS not configured.  There's nothing to test.");
                return;
            }

            ctx = new InitialDirContext(env);

            String providerUrl = (String) ctx.getEnvironment()
                    .get(Context.PROVIDER_URL);

            if (providerUrl == null) {
                throw new RuntimeException("Failed:  PROVIDER_URL not set");
            }

            DNSTestUtils.debug("PROVIDER_URL = \"" + providerUrl + "\"");

            // We don't know exactly what providerUrl's value should be.
            // Check that it is a space-separated list of one or more URLs
            // of the form "dns://xxxxxx".

            String[] urls = providerUrl.split(" ");
            if (urls.length < 1) {
                throw new RuntimeException("Failed:  PROVIDER_URL is empty");
            }

            for (String url : urls) {
                DNSTestUtils.debug(url);
                if (!checkUrl(url)) {
                    throw new RuntimeException(
                            "Failed:  Unexpected DNS URL: " + url);
                }
            }

        } finally {
            DNSTestUtils.cleanup(ctx);
        }
    }

    private static boolean checkUrl(String url) {
        return url.startsWith("dns://") && url.length() >= 7;
    }

    private static boolean isPlatformServersAvailable() {
        try {
            java.lang.reflect.Method psa = com.sun.jndi.dns.DnsContextFactory.class
                    .getMethod("platformServersAvailable", null);
            return (Boolean) psa.invoke(null, null);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}