/*

 * Copyright (c) 2019, 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

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import java.nio.file.Path;

import java.util.jar.Manifest;

import java.util.jar.Attributes.Name;

import jdk.test.lib.util.JarUtils;

import jdk.test.lib.SecurityTools;

import org.testng.annotations.Test;

import org.testng.annotations.BeforeClass;

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

import static org.testng.Assert.*;

/**

 * @test

 * @bug 8217375

 * @modules java.base/sun.security.util

 * @library /test/lib /lib/testlibrary

 * @run testng EmptyJar

 * @summary Checks that signing an empty jar file does not result in an NPE or

 * other error condition.

 */

public class EmptyJar {

    static final String KEYSTORE_FILENAME = "test.jks";

    @BeforeClass

    public void prepareKeyStore() throws Exception {

        SecurityTools.keytool("-genkeypair -keyalg EC -keystore "

                + KEYSTORE_FILENAME + " -storepass changeit -keypass changeit"

                + " -alias a -dname CN=A").shouldHaveExitValue(0);

    }

    @Test

    public void test() throws Exception {

        String jarFilename = "test.jar";

        JarUtils.createJarFile(Path.of(jarFilename), (Manifest) null,

                Path.of("."));

        SecurityTools.jarsigner("-keystore " + KEYSTORE_FILENAME +

                " -storepass changeit -verbose -debug " + jarFilename + " a")

                .shouldHaveExitValue(0);

        // verify that jarsigner has added a default manifest

        byte[] mfBytes = Utils.readJarManifestBytes(jarFilename);

        Utils.echoManifest(mfBytes, "manifest");

        assertTrue(new String(mfBytes, UTF_8).startsWith(

                Name.MANIFEST_VERSION + ": 1.0\r\nCreated-By: "));

    }

}