org.apache.coyote.UpgradeProtocol Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.coyote;
import org.apache.coyote.http11.upgrade.InternalHttpUpgradeHandler;
import org.apache.tomcat.util.net.SocketWrapperBase;
public interface UpgradeProtocol {
/**
* @param isSSLEnabled Is this for a connector that is configured to support
* TLS. Some protocols (e.g. HTTP/2) only support HTTP
* upgrade over non-secure connections.
* @return The name that clients will use to request an upgrade to this
* protocol via an HTTP/1.1 upgrade request or null if
* upgrade via an HTTP/1.1 upgrade request is not supported.
*/
public String getHttpUpgradeName(boolean isSSLEnabled);
/**
* @return The byte sequence as listed in the IANA registry for this
* protocol or null if upgrade via ALPN is not
* supported.
*/
public byte[] getAlpnIdentifier();
/**
* @return The name of the protocol as listed in the IANA registry if and
* only if {@link #getAlpnIdentifier()} returns the UTF-8 encoding
* of this name. If {@link #getAlpnIdentifier()} returns some other
* byte sequence, then this method returns the empty string. If
* upgrade via ALPN is not supported then null is
* returned.
*/
/*
* Implementation note: If Tomcat ever supports ALPN for a protocol where
* the identifier is not the UTF-8 encoding of the name
* then some refactoring is going to be required.
*
* Implementation note: Tomcat assumes that the UTF-8 encoding of this name
* will not exceed 255 bytes. Tomcat's behaviour if
* longer names are used is undefined.
*/
public String getAlpnName();
/**
* @param socketWrapper The socketWrapper for the connection that requires
* a processor
* @param adapter The Adapter instance that provides access to the standard
* Engine/Host/Context/Wrapper processing chain
*
* @return A processor instance for processing a connection using this
* protocol.
*/
public Processor getProcessor(SocketWrapperBase socketWrapper, Adapter adapter);
/**
* @param socketWrapper The socket
* @param adapter The Adapter to use to configure the new upgrade handler
* @param request A copy (may be incomplete) of the request that triggered
* the upgrade
*
* @return An instance of the HTTP upgrade handler for this protocol
*/
public InternalHttpUpgradeHandler getInternalUpgradeHandler(SocketWrapperBase socketWrapper, Adapter adapter, Request request);
/**
* Allows the implementation to examine the request and accept or reject it
* based on what it finds.
*
* @param request The request that included an upgrade header for this
* protocol
*
* @return true if the request is accepted, otherwise
* false
*/
public boolean accept(Request request);
/**
* Configure the HTTP/1.1 protocol that this UpgradeProcotol is nested
* under. Connections passed to this UpgradeProtocol via HTTP upgrade will
* have been initially handled by this HTTP/1.1 protocol implementation.
*
* The default implementation is a NO-OP.
*
* @param protocol The HTTP/1.1 protocol implementation that will initially
* handle any connections passed to this UpgradeProtocol via
* the HTTP upgrade mechanism
*/
public default void setHttp11Protocol(AbstractProtocol protocol) {
// NO-OP
}
}