/*

 * 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 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).

 * @library ../lib/

 * @modules jdk.naming.dns/com.sun.jndi.dns

 *          java.base/sun.security.util

 * @run main ProviderUrlGen

 */

import javax.naming.Context;

import javax.naming.NamingException;

import javax.naming.directory.InitialDirContext;

import java.lang.reflect.InvocationTargetException;

public class ProviderUrlGen extends DNSTestBase {

    public ProviderUrlGen() {

        setLocalServer(false);

    }

    public static void main(String[] args) throws Exception {

        if (!isPlatformServersAvailable()) {

            DNSTestUtils.debug("DNS not configured. There's nothing to test.");

            return;

        }

        new ProviderUrlGen().run(args);

    }

    @Override public void runTest() throws Exception {

        initContext();

        String providerUrl = (String) context().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);

            }

        }

    }

    private void initContext() throws NamingException {

        env().remove(Context.PROVIDER_URL);

        setContext(new InitialDirContext(env()));

    }

    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 (NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {

            e.printStackTrace();

            return false;

        }

    }

}