/*

 * Copyright (c) 2016, 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

 * @modules java.logging

 * @summary Test java.lang.reflect.Module methods that specify permission checks

 * @run main/othervm -Djava.security.policy=${test.src}/allow.policy WithSecurityManager allow

 * @run main/othervm WithSecurityManager deny

 */

import java.io.IOException;

import java.io.InputStream;

import java.lang.module.Configuration;

import java.lang.module.ModuleFinder;

import java.lang.module.ModuleReference;

import java.lang.reflect.Layer;

import java.lang.reflect.Module;

import java.util.Collections;

import java.util.Optional;

import java.util.Set;

/**

 * Test java.lang.reflect.Module methods that specify permission checks.

 */

public class WithSecurityManager {

    // a module that will be loaded into a child layer

    static final String ANOTHER_MODULE          = "java.logging";

    static final String ANOTHER_MODULE_RESOURCE = "java/util/logging/Logger.class";

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

        boolean allow = args[0].equals("allow");

        // base module, in the boot layer

        Module base = Object.class.getModule();

        // another module, in a child layer

        Module other = loadModuleInChildLayer(ANOTHER_MODULE);

        assertTrue(other.getLayer() != Layer.boot());

        System.setSecurityManager(new SecurityManager());

        test(base, "java/lang/Object.class", allow);

        test(other, ANOTHER_MODULE_RESOURCE, allow);

    }

    /**

     * Test the permission checks by invoking methods on the given module.

     *

     * If {@code allow} is {@code true} then the permission checks should succeed.

     */

    static void test(Module m, String name, boolean allow) throws IOException {

        // test Module::getClassLoader

        System.out.format("Test getClassLoader on %s ...%n", m);

        try {

            ClassLoader cl = m.getClassLoader();

            System.out.println(cl);

            if (!allow)

                assertTrue("getClassLoader should have failed", false);

        } catch (SecurityException e) {

            System.out.println(e + " thrown");

            if (allow)

                throw e;

        }

        // test Module::getResourceAsStream

        System.out.format("Test getResourceAsStream(\"%s\") on %s ...%n", name, m);

        try (InputStream in = m.getResourceAsStream(name)) {

            System.out.println(in);

            if (allow && (in == null))

                assertTrue(name + " not found", false);

            if (!allow && (in != null))

                assertTrue(name + " should not be found", false);

        }

    }

    /**

     * Create a module layer that contains the given system module.

     */

    static Module loadModuleInChildLayer(String mn) {

        Optional<ModuleReference> omref = ModuleFinder.ofSystem().find(mn);

        assertTrue("module " + mn + " not a system module", omref.isPresent());

        // create a ModuleFinder that only finds this module

        ModuleReference mref = omref.get();

        ModuleFinder finder = new ModuleFinder() {

            @Override

            public Optional<ModuleReference> find(String name) {

                if (name.equals(mn))

                    return Optional.of(mref);

                else

                    return Optional.empty();

            }

            @Override

            public Set<ModuleReference> findAll() {

                return Collections.singleton(mref);

            }

        };

        // create a child configuration and layer with this module

        Layer bootLayer = Layer.boot();

        Configuration cf = bootLayer

            .configuration()

            .resolveRequires(finder, ModuleFinder.of(), Set.of(ANOTHER_MODULE));

        Layer layer = bootLayer.defineModulesWithOneLoader(cf, null);

        Optional<Module> om = layer.findModule(mn);

        assertTrue("module " + mn + " not in child layer", om.isPresent());

        return om.get();

    }

    static void assertTrue(String msg, boolean e) {

        if (!e)

            throw new RuntimeException(msg);

    }

    static void assertTrue(boolean e) {

        if (!e)

            throw new RuntimeException();

    }

}