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 * JBoss, Home of Professional Open Source.
 *
 * Copyright 2024 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.undertow.attribute;

import io.undertow.server.HttpServerExchange;
import io.undertow.server.SSLSessionInfo;

/**
 * An attribute which describes the secure protocol. This is the protocol resolved from the {@link SSLSessionInfo#getSecureProtocol()}.
 * @author <a href="mailto:jperkins@redhat.com">James R. Perkins</a>
 */
public class SecureProtocolAttribute implements ExchangeAttribute {

    public static final SecureProtocolAttribute INSTANCE = new SecureProtocolAttribute();

    @Override
    public String readAttribute(final HttpServerExchange exchange) {
        final SSLSessionInfo ssl = exchange.getConnection().getSslSessionInfo();
        return (ssl == null ) ? null : ssl.getSecureProtocol();
    }

    @Override
    public void writeAttribute(final HttpServerExchange exchange, final String newValue) throws ReadOnlyAttributeException {
        throw new ReadOnlyAttributeException("Secure Protocol", newValue);
    }

    @Override
    public String toString() {
        return "%{SECURE_PROTOCOL}";
    }

    public static final class Builder implements ExchangeAttributeBuilder {

        @Override
        public String name() {
            return "Secure Protocol";
        }

        @Override
        public ExchangeAttribute build(final String token) {
            if (token.equals("%{SECURE_PROTOCOL}")) {
                return INSTANCE;
            }
            return null;
        }

        @Override
        public int priority() {
            return 0;
        }
    }
}
