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147 lines
5.3 KiB
Java
147 lines
5.3 KiB
Java
/*
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* ====================================================================
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.impl.auth;
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import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
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import ch.boye.httpclientandroidlib.FormattedHeader;
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import ch.boye.httpclientandroidlib.Header;
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import ch.boye.httpclientandroidlib.HttpRequest;
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import ch.boye.httpclientandroidlib.auth.AUTH;
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import ch.boye.httpclientandroidlib.auth.AuthenticationException;
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import ch.boye.httpclientandroidlib.auth.ContextAwareAuthScheme;
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import ch.boye.httpclientandroidlib.auth.Credentials;
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import ch.boye.httpclientandroidlib.auth.MalformedChallengeException;
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import ch.boye.httpclientandroidlib.protocol.HTTP;
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import ch.boye.httpclientandroidlib.protocol.HttpContext;
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import ch.boye.httpclientandroidlib.util.CharArrayBuffer;
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/**
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* Abstract authentication scheme class that serves as a basis
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* for all authentication schemes supported by HttpClient. This class
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* defines the generic way of parsing an authentication challenge. It
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* does not make any assumptions regarding the format of the challenge
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* nor does it impose any specific way of responding to that challenge.
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*
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*
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* @since 4.0
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*/
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@NotThreadSafe // proxy
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public abstract class AuthSchemeBase implements ContextAwareAuthScheme {
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/**
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* Flag whether authenticating against a proxy.
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*/
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private boolean proxy;
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public AuthSchemeBase() {
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super();
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}
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/**
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* Processes the given challenge token. Some authentication schemes
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* may involve multiple challenge-response exchanges. Such schemes must be able
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* to maintain the state information when dealing with sequential challenges
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*
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* @param header the challenge header
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*
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* @throws MalformedChallengeException is thrown if the authentication challenge
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* is malformed
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*/
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public void processChallenge(final Header header) throws MalformedChallengeException {
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if (header == null) {
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throw new IllegalArgumentException("Header may not be null");
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}
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String authheader = header.getName();
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if (authheader.equalsIgnoreCase(AUTH.WWW_AUTH)) {
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this.proxy = false;
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} else if (authheader.equalsIgnoreCase(AUTH.PROXY_AUTH)) {
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this.proxy = true;
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} else {
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throw new MalformedChallengeException("Unexpected header name: " + authheader);
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}
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CharArrayBuffer buffer;
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int pos;
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if (header instanceof FormattedHeader) {
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buffer = ((FormattedHeader) header).getBuffer();
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pos = ((FormattedHeader) header).getValuePos();
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} else {
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String s = header.getValue();
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if (s == null) {
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throw new MalformedChallengeException("Header value is null");
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}
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buffer = new CharArrayBuffer(s.length());
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buffer.append(s);
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pos = 0;
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}
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while (pos < buffer.length() && HTTP.isWhitespace(buffer.charAt(pos))) {
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pos++;
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}
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int beginIndex = pos;
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while (pos < buffer.length() && !HTTP.isWhitespace(buffer.charAt(pos))) {
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pos++;
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}
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int endIndex = pos;
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String s = buffer.substring(beginIndex, endIndex);
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if (!s.equalsIgnoreCase(getSchemeName())) {
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throw new MalformedChallengeException("Invalid scheme identifier: " + s);
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}
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parseChallenge(buffer, pos, buffer.length());
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}
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@SuppressWarnings("deprecation")
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public Header authenticate(
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final Credentials credentials,
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final HttpRequest request,
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final HttpContext context) throws AuthenticationException {
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return authenticate(credentials, request);
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}
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protected abstract void parseChallenge(
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CharArrayBuffer buffer, int beginIndex, int endIndex) throws MalformedChallengeException;
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/**
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* Returns <code>true</code> if authenticating against a proxy, <code>false</code>
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* otherwise.
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*
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* @return <code>true</code> if authenticating against a proxy, <code>false</code>
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* otherwise
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*/
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public boolean isProxy() {
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return this.proxy;
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}
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@Override
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public String toString() {
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return getSchemeName();
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}
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}
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