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Java example source code file (AuthSchemeBase.java)

This example source code file (AuthSchemeBase.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

authschemebase, chararraybuffer, formattedheader, header, illegalargumentexception, invalid, malformedchallengeexception, notthreadsafe, override, string, unexpected

The AuthSchemeBase.java example source code

/*
 * ====================================================================
 *
 *  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 org.apache.http.impl.auth;

import org.apache.http.annotation.NotThreadSafe;

import org.apache.http.FormattedHeader;
import org.apache.http.Header;
import org.apache.http.auth.AUTH;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.MalformedChallengeException;
import org.apache.http.protocol.HTTP;
import org.apache.http.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 AuthScheme {

    /**
     * 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());
    }

    protected abstract void parseChallenge(
            CharArrayBuffer buffer, int pos, int len) throws MalformedChallengeException;

    /**
     * Returns <code>true if authenticating against a proxy, false
     * otherwise.
     *  
     * @return <code>true if authenticating against a proxy, false
     * otherwise
     */
    public boolean isProxy() {
        return this.proxy;
    }

    @Override
    public String toString() {
        return getSchemeName();
    }
    
}

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