/*

 * Copyright (c) 2018, 2021, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package sun.net.util;

import java.io.IOException;

import java.lang.reflect.Constructor;

import java.net.InetSocketAddress;

import java.net.UnixDomainSocketAddress;

import java.net.SocketAddress;

import java.security.AccessController;

import java.security.PrivilegedAction;

import sun.security.util.SecurityProperties;

public final class SocketExceptions {

    private SocketExceptions() {}

    private static final boolean enhancedExceptionText =

        SecurityProperties.includedInExceptions("hostInfo");

    /**

     * Utility which takes an exception and returns either the same exception

     * or a new exception of the same type with the same stack trace

     * and detail message enhanced with addressing information from the

     * given InetSocketAddress.

     *

     * If the system/security property "jdk.includeInExceptions" is not

     * set or does not contain the category hostInfo,

     * then the original exception is returned.

     *

     * Only specific IOException subtypes are supported.

     */

    public static IOException of(IOException e, SocketAddress addr) {

        if (!enhancedExceptionText || addr == null) {

            return e;

        }

        if (addr instanceof UnixDomainSocketAddress) {

            return ofUnixDomain(e, (UnixDomainSocketAddress)addr);

        } else if (addr instanceof InetSocketAddress) {

            return ofInet(e, (InetSocketAddress)addr);

        } else {

            return e;

        }

    }

    private static IOException ofInet(IOException e, InetSocketAddress addr) {

        int port = addr.getPort();

        String host = addr.getHostString();

        StringBuilder sb = new StringBuilder();

        sb.append(e.getMessage());

        sb.append(": ");

        sb.append(host);

        sb.append(':');

        sb.append(Integer.toString(port));

        String enhancedMsg = sb.toString();

        return create(e, enhancedMsg);

    }

    private static IOException ofUnixDomain(IOException e, UnixDomainSocketAddress addr) {

        String path = addr.getPath().toString();

        StringBuilder sb = new StringBuilder();

        sb.append(e.getMessage());

        sb.append(": ");

        sb.append(path);

        String enhancedMsg = sb.toString();

        return create(e, enhancedMsg);

    }

    // return a new instance of the same type with the given detail

    // msg, or if the type doesn't support detail msgs, return given

    // instance.

    @SuppressWarnings("removal")

    private static IOException create(IOException e, String msg) {

        return AccessController.doPrivileged(new PrivilegedAction<IOException>() {

            public IOException run() {

                try {

                    Class<?> clazz = e.getClass();

                    Constructor<?> ctor = clazz.getConstructor(String.class);

                    IOException e1 = (IOException)(ctor.newInstance(msg));

                    e1.setStackTrace(e.getStackTrace());

                    return e1;

                } catch (Exception e0) {

                    // Some eg AsynchronousCloseException have no detail msg

                    return e;

                }

            }

        });

    }

}