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110 lines (96 loc) · 4.13 KB
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/*
* Copyright (c) 2006, 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 robaho.net.httpserver;
import com.sun.net.httpserver.Authenticator;
import com.sun.net.httpserver.Filter;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpPrincipal;
import java.io.IOException;
import java.security.Principal;
/**
* A {@link Filter} that authenticates every request through a JDK
* {@link Authenticator} before the handler runs: on success the
* authenticated {@link HttpPrincipal} is exposed via
* {@code HttpExchange.getPrincipal()}; on failure the filter answers with
* the authenticator's 401/403 result and the handler is never invoked.
* Register it as a context filter:
* {@code context.getFilters().add(new AuthFilter(authenticator))}.
*/
public class AuthFilter extends Filter {
// volatile: setAuthenticator runs on admin threads while request threads
// read the field - without the happens-before edge an in-flight
// connection could serve unauthenticated on a stale null forever, and a
// concurrent null-set could NPE between the check and the call
private volatile Authenticator authenticator;
/**
* create the filter around the given authenticator; it may be
* replaced later via {@link #setAuthenticator}
*/
public AuthFilter(Authenticator authenticator) {
this.authenticator = authenticator;
}
/** the filter description shown in diagnostics */
@Override
public String description() {
return "Authentication filter";
}
/** replace the authenticator (takes effect for subsequent requests) */
public void setAuthenticator(Authenticator a) {
authenticator = a;
}
/**
* The filter's implementation, which is invoked by the server
*/
@Override
public void doFilter(HttpExchange t, Filter.Chain chain) throws IOException {
if (authenticator != null) {
Authenticator.Result r = authenticator.authenticate(t);
if (r instanceof Authenticator.Success s) {
PrincipalExchange e = (PrincipalExchange) t;
e.setPrincipal(s.getPrincipal());
chain.doFilter(t);
} else if (r instanceof Authenticator.Retry ry) {
// the reply goes out IMMEDIATELY: consuming the request body
// first (the JDK-inherited behavior) read the RAW socket
// stream forever on upgrade/CONNECT requests (getRequestBody
// hands those out unframed - an unauthenticated client pinned
// the connection thread and the 401 never went out), and let
// a drip-fed body pin the thread even on normal requests.
// the framework's own bounded drain (64KB/1s) after the
// response handles the leftover bytes, exactly as it does
// for any handler that ignores the body
t.sendResponseHeaders(ry.getResponseCode(), -1);
} else if (r instanceof Authenticator.Failure f) {
t.sendResponseHeaders(f.getResponseCode(), -1);
}
} else {
chain.doFilter(t);
}
}
interface PrincipalExchange {
void setPrincipal(HttpPrincipal p);
Principal getPrincipal();
}
}