/*
* ====================================================================
*
* 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.commons.codec.binary.Base64;
import org.apache.http.Header;
import org.apache.http.HttpRequest;
import org.apache.http.auth.AuthenticationException;
import org.apache.http.auth.Credentials;
import org.apache.http.auth.AUTH;
import org.apache.http.auth.MalformedChallengeException;
import org.apache.http.auth.params.AuthParams;
import org.apache.http.message.BufferedHeader;
import org.apache.http.util.CharArrayBuffer;
import org.apache.http.util.EncodingUtils;
/**
* Basic authentication scheme as defined in RFC 2617.
* <p>
* The following parameters can be used to customize the behavior of this
* class:
* <ul>
* <li>{@link org.apache.http.auth.params.AuthPNames#CREDENTIAL_CHARSET}</li>
* </ul>
*
* @since 4.0
*/
@NotThreadSafe
public class BasicScheme extends RFC2617Scheme {
/** Whether the basic authentication process is complete */
private boolean complete;
/**
* Default constructor for the basic authentication scheme.
*/
public BasicScheme() {
super();
this.complete = false;
}
/**
* Returns textual designation of the basic authentication scheme.
*
* @return <code>basic</code>
*/
public String getSchemeName() {
return "basic";
}
/**
* Processes the Basic challenge.
*
* @param header the challenge header
*
* @throws MalformedChallengeException is thrown if the authentication challenge
* is malformed
*/
@Override
public void processChallenge(
final Header header) throws MalformedChallengeException {
super.processChallenge(header);
this.complete = true;
}
/**
* Tests if the Basic authentication process has been completed.
*
* @return <tt>true</tt> if Basic authorization has been processed,
* <tt>false</tt> otherwise.
*/
public boolean isComplete() {
return this.complete;
}
/**
* Returns <tt>false</tt>. Basic authentication scheme is request based.
*
* @return <tt>false</tt>.
*/
public boolean isConnectionBased() {
return false;
}
/**
* Produces basic authorization header for the given set of {@link Credentials}.
*
* @param credentials The set of credentials to be used for authentication
* @param request The request being authenticated
* @throws InvalidCredentialsException if authentication credentials are not
* valid or not applicable for this authentication scheme
* @throws AuthenticationException if authorization string cannot
* be generated due to an authentication failure
*
* @return a basic authorization string
*/
public Header authenticate(
final Credentials credentials,
final HttpRequest request) throws AuthenticationException {
if (credentials == null) {
throw new IllegalArgumentException("Credentials may not be null");
}
if (request == null) {
throw new IllegalArgumentException("HTTP request may not be null");
}
String charset = AuthParams.getCredentialCharset(request.getParams());
return authenticate(credentials, charset, isProxy());
}
/**
* Returns a basic <tt>Authorization</tt> header value for the given
* {@link Credentials} and charset.
*
* @param credentials The credentials to encode.
* @param charset The charset to use for encoding the credentials
*
* @return a basic authorization header
*/
public static Header authenticate(
final Credentials credentials,
final String charset,
boolean proxy) {
if (credentials == null) {
throw new IllegalArgumentException("Credentials may not be null");
}
if (charset == null) {
throw new IllegalArgumentException("charset may not be null");
}
StringBuilder tmp = new StringBuilder();
tmp.append(credentials.getUserPrincipal().getName());
tmp.append(":");
tmp.append((credentials.getPassword() == null) ? "null" : credentials.getPassword());
byte[] base64password = Base64.encodeBase64(
EncodingUtils.getBytes(tmp.toString(), charset));
CharArrayBuffer buffer = new CharArrayBuffer(32);
if (proxy) {
buffer.append(AUTH.PROXY_AUTH_RESP);
} else {
buffer.append(AUTH.WWW_AUTH_RESP);
}
buffer.append(": Basic ");
buffer.append(base64password, 0, base64password.length);
return new BufferedHeader(buffer);
}
}
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