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/*
* ====================================================================
*
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.impl.auth;
import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
import ch.boye.httpclientandroidlib.FormattedHeader;
import ch.boye.httpclientandroidlib.Header;
import ch.boye.httpclientandroidlib.HttpRequest;
import ch.boye.httpclientandroidlib.auth.AUTH;
import ch.boye.httpclientandroidlib.auth.AuthenticationException;
import ch.boye.httpclientandroidlib.auth.ContextAwareAuthScheme;
import ch.boye.httpclientandroidlib.auth.Credentials;
import ch.boye.httpclientandroidlib.auth.MalformedChallengeException;
import ch.boye.httpclientandroidlib.protocol.HTTP;
import ch.boye.httpclientandroidlib.protocol.HttpContext;
import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
/**
* Abstract authentication scheme class that serves as a basis
* for all authentication schemes supported by HttpClient. This class
* defines the generic way of parsing an authentication challenge. It
* does not make any assumptions regarding the format of the challenge
* nor does it impose any specific way of responding to that challenge.
*
*
* @since 4.0
*/
@NotThreadSafe // proxy
public abstract class AuthSchemeBase implements ContextAwareAuthScheme {
/**
* Flag whether authenticating against a proxy.
*/
private boolean proxy;
public AuthSchemeBase() {
super();
}
/**
* Processes the given challenge token. Some authentication schemes
* may involve multiple challenge-response exchanges. Such schemes must be able
* to maintain the state information when dealing with sequential challenges
*
* @param header the challenge header
*
* @throws MalformedChallengeException is thrown if the authentication challenge
* is malformed
*/
public void processChallenge(final Header header) throws MalformedChallengeException {
if (header == null) {
throw new IllegalArgumentException("Header may not be null");
}
String authheader = header.getName();
if (authheader.equalsIgnoreCase(AUTH.WWW_AUTH)) {
this.proxy = false;
} else if (authheader.equalsIgnoreCase(AUTH.PROXY_AUTH)) {
this.proxy = true;
} else {
throw new MalformedChallengeException("Unexpected header name: " + authheader);
}
CharArrayBuffer buffer;
int pos;
if (header instanceof FormattedHeader) {
buffer = ((FormattedHeader) header).getBuffer();
pos = ((FormattedHeader) header).getValuePos();
} else {
String s = header.getValue();
if (s == null) {
throw new MalformedChallengeException("Header value is null");
}
buffer = new CharArrayBuffer(s.length());
buffer.append(s);
pos = 0;
}
while (pos < buffer.length() && HTTP.isWhitespace(buffer.charAt(pos))) {
pos++;
}
int beginIndex = pos;
while (pos < buffer.length() && !HTTP.isWhitespace(buffer.charAt(pos))) {
pos++;
}
int endIndex = pos;
String s = buffer.substring(beginIndex, endIndex);
if (!s.equalsIgnoreCase(getSchemeName())) {
throw new MalformedChallengeException("Invalid scheme identifier: " + s);
}
parseChallenge(buffer, pos, buffer.length());
}
@SuppressWarnings("deprecation")
public Header authenticate(
final Credentials credentials,
final HttpRequest request,
final HttpContext context) throws AuthenticationException {
return authenticate(credentials, request);
}
protected abstract void parseChallenge(
CharArrayBuffer buffer, int beginIndex, int endIndex) throws MalformedChallengeException;
/**
* Returns <code>true</code> if authenticating against a proxy, <code>false</code>
* otherwise.
*
* @return <code>true</code> if authenticating against a proxy, <code>false</code>
* otherwise
*/
public boolean isProxy() {
return this.proxy;
}
@Override
public String toString() {
return getSchemeName();
}
}
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