/*
* $Header: /home/cvs/jakarta-commons/httpclient/src/java/org/apache/commons/httpclient/auth/AuthChallengeParser.java,v 1.4.2.2 2004/02/22 18:21:14 olegk Exp $
* $Revision: 1.4.2.2 $
* $Date: 2004/02/22 18:21:14 $
*
* ====================================================================
*
* Copyright 2002-2004 The Apache Software Foundation
*
* Licensed 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/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.commons.httpclient.auth;
import java.util.Map;
import java.util.HashMap;
/**
* This class provides utility methods for parsing HTTP www and proxy authentication
* challenges.
*
* @author <a href="mailto:[email protected]">Oleg Kalnichevski</a>
*
* @since 2.0beta1
*/
public final class AuthChallengeParser {
/**
* Extracts authentication scheme from the given authentication
* challenge.
*
* @param challengeStr the authentication challenge string
* @return authentication scheme
*
* @throws MalformedChallengeException when the authentication challenge string
* is malformed
*
* @since 2.0beta1
*/
public static String extractScheme(final String challengeStr)
throws MalformedChallengeException {
if (challengeStr == null) {
throw new IllegalArgumentException("Challenge may not be null");
}
int i = challengeStr.indexOf(' ');
String s = null;
if (i == -1) {
s = challengeStr;
} else {
s = challengeStr.substring(0, i);
}
if (s.equals("")) {
throw new MalformedChallengeException("Invalid challenge: " + challengeStr);
}
return s.toLowerCase();
}
/**
* Extracts a map of challenge parameters from an authentication challenge.
* Keys in the map are lower-cased
*
* @param challengeStr the authentication challenge string
* @return a map of authentication challenge parameters
* @throws MalformedChallengeException when the authentication challenge string
* is malformed
*
* @since 2.0beta1
*/
public static Map extractParams(final String challengeStr)
throws MalformedChallengeException {
if (challengeStr == null) {
throw new IllegalArgumentException("Challenge may not be null");
}
int i = challengeStr.indexOf(' ');
if (i == -1) {
throw new MalformedChallengeException("Invalid challenge: " + challengeStr);
}
Map elements = new HashMap();
i++;
int len = challengeStr.length();
String name = null;
String value = null;
StringBuffer buffer = new StringBuffer();
boolean parsingName = true;
boolean inQuote = false;
boolean gotIt = false;
while (i < len) {
// Parse one char at a time
char ch = challengeStr.charAt(i);
i++;
// Process the char
if (parsingName) {
// parsing name
if (ch == '=') {
name = buffer.toString().trim();
parsingName = false;
buffer.setLength(0);
} else if (ch == ',') {
name = buffer.toString().trim();
value = null;
gotIt = true;
buffer.setLength(0);
} else {
buffer.append(ch);
}
// Have I reached the end of the challenge string?
if (i == len) {
name = buffer.toString().trim();
value = null;
gotIt = true;
}
} else {
//parsing value
if (!inQuote) {
// Value is not quoted or not found yet
if (ch == ',') {
value = buffer.toString().trim();
gotIt = true;
buffer.setLength(0);
} else {
// no value yet
if (buffer.length() == 0) {
if (ch == ' ') {
//discard
} else if (ch == '\t') {
//discard
} else if (ch == '\n') {
//discard
} else if (ch == '\r') {
//discard
} else {
// otherwise add to the buffer
buffer.append(ch);
if (ch == '"') {
inQuote = true;
}
}
} else {
// already got something
// just keep on adding to the buffer
buffer.append(ch);
}
}
} else {
// Value is quoted
// Keep on adding until closing quote is encountered
buffer.append(ch);
if (ch == '"') {
inQuote = false;
}
}
// Have I reached the end of the challenge string?
if (i == len) {
value = buffer.toString().trim();
gotIt = true;
}
}
if (gotIt) {
// Got something
if ((name == null) || (name.equals(""))) {
throw new MalformedChallengeException("Invalid challenge: " + challengeStr);
}
// Strip quotes when present
if ((value != null) && (value.length() > 1)) {
if ((value.charAt(0) == '"')
&& (value.charAt(value.length() - 1) == '"')) {
value = value.substring(1, value.length() - 1);
}
}
elements.put(name.toLowerCase(), value);
parsingName = true;
gotIt = false;
}
}
return elements;
}
}
|