/*
 * Copyright (c) 2003, 2015, 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.security.ssl;

import javax.net.ssl.*;

/*
 * A simple class to congregate alerts, their definitions, and common
 * support methods.
 */

final class Alerts {

    /*
     * Alerts are always a fixed two byte format (level/description).
     */

    // warnings and fatal errors are package private facilities/constants

    // Alert levels (enum AlertLevel)
    static final byte           alert_warning = 1;
    static final byte           alert_fatal = 2;

    /*
     * Alert descriptions (enum AlertDescription)
     *
     * We may not use them all in our processing, but if someone
     * sends us one, we can at least convert it to a string for the
     * user.
     */
    static final byte           alert_close_notify = 0;
    static final byte           alert_unexpected_message = 10;
    static final byte           alert_bad_record_mac = 20;
    static final byte           alert_decryption_failed = 21;
    static final byte           alert_record_overflow = 22;
    static final byte           alert_decompression_failure = 30;
    static final byte           alert_handshake_failure = 40;
    static final byte           alert_no_certificate = 41;
    static final byte           alert_bad_certificate = 42;
    static final byte           alert_unsupported_certificate = 43;
    static final byte           alert_certificate_revoked = 44;
    static final byte           alert_certificate_expired = 45;
    static final byte           alert_certificate_unknown = 46;
    static final byte           alert_illegal_parameter = 47;
    static final byte           alert_unknown_ca = 48;
    static final byte           alert_access_denied = 49;
    static final byte           alert_decode_error = 50;
    static final byte           alert_decrypt_error = 51;
    static final byte           alert_export_restriction = 60;
    static final byte           alert_protocol_version = 70;
    static final byte           alert_insufficient_security = 71;
    static final byte           alert_internal_error = 80;
    static final byte           alert_user_canceled = 90;
    static final byte           alert_no_renegotiation = 100;

    // from RFC 3546 (TLS Extensions)
    static final byte           alert_unsupported_extension = 110;
    static final byte           alert_certificate_unobtainable = 111;
    static final byte           alert_unrecognized_name = 112;
    static final byte           alert_bad_certificate_status_response = 113;
    static final byte           alert_bad_certificate_hash_value = 114;

    // from RFC 7301 (TLS ALPN Extension)
    static final byte           alert_no_application_protocol = 120;

    static String alertDescription(byte code) {
        switch (code) {

        case alert_close_notify:
            return "close_notify";
        case alert_unexpected_message:
            return "unexpected_message";
        case alert_bad_record_mac:
            return "bad_record_mac";
        case alert_decryption_failed:
            return "decryption_failed";
        case alert_record_overflow:
            return "record_overflow";
        case alert_decompression_failure:
            return "decompression_failure";
        case alert_handshake_failure:
            return "handshake_failure";
        case alert_no_certificate:
            return "no_certificate";
        case alert_bad_certificate:
            return "bad_certificate";
        case alert_unsupported_certificate:
            return "unsupported_certificate";
        case alert_certificate_revoked:
            return "certificate_revoked";
        case alert_certificate_expired:
            return "certificate_expired";
        case alert_certificate_unknown:
            return "certificate_unknown";
        case alert_illegal_parameter:
            return "illegal_parameter";
        case alert_unknown_ca:
            return "unknown_ca";
        case alert_access_denied:
            return "access_denied";
        case alert_decode_error:
            return "decode_error";
        case alert_decrypt_error:
            return "decrypt_error";
        case alert_export_restriction:
            return "export_restriction";
        case alert_protocol_version:
            return "protocol_version";
        case alert_insufficient_security:
            return "insufficient_security";
        case alert_internal_error:
            return "internal_error";
        case alert_user_canceled:
            return "user_canceled";
        case alert_no_renegotiation:
            return "no_renegotiation";
        case alert_unsupported_extension:
            return "unsupported_extension";
        case alert_certificate_unobtainable:
            return "certificate_unobtainable";
        case alert_unrecognized_name:
            return "unrecognized_name";
        case alert_bad_certificate_status_response:
            return "bad_certificate_status_response";
        case alert_bad_certificate_hash_value:
            return "bad_certificate_hash_value";
        case alert_no_application_protocol:
            return "no_application_protocol";

        default:
            return "<UNKNOWN ALERT: " + (code & 0x0ff) + ">";
        }
    }

    static SSLException getSSLException(byte description, String reason) {
        return getSSLException(description, null, reason);
    }

    /*
     * Try to be a little more specific in our choice of
     * exceptions to throw.
     */
    static SSLException getSSLException(byte description, Throwable cause,
            String reason) {

        SSLException e;
        // the SSLException classes do not have a no-args constructor
        // make up a message if there is none
        if (reason == null) {
            if (cause != null) {
                reason = cause.toString();
            } else {
                reason = "";
            }
        }
        switch (description) {
        case alert_handshake_failure:
        case alert_no_certificate:
        case alert_bad_certificate:
        case alert_unsupported_certificate:
        case alert_certificate_revoked:
        case alert_certificate_expired:
        case alert_certificate_unknown:
        case alert_unknown_ca:
        case alert_access_denied:
        case alert_decrypt_error:
        case alert_export_restriction:
        case alert_insufficient_security:
        case alert_unsupported_extension:
        case alert_certificate_unobtainable:
        case alert_unrecognized_name:
        case alert_bad_certificate_status_response:
        case alert_bad_certificate_hash_value:
        case alert_no_application_protocol:
            e = new SSLHandshakeException(reason);
            break;

        case alert_close_notify:
        case alert_unexpected_message:
        case alert_bad_record_mac:
        case alert_decryption_failed:
        case alert_record_overflow:
        case alert_decompression_failure:
        case alert_illegal_parameter:
        case alert_decode_error:
        case alert_protocol_version:
        case alert_internal_error:
        case alert_user_canceled:
        case alert_no_renegotiation:
        default:
            e = new SSLException(reason);
            break;
        }

        if (cause != null) {
            e.initCause(cause);
        }
        return e;
    }
}
