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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.
*/
package org.apache.tuscany.sca.policy.security.http.util;
import java.util.StringTokenizer;
import javax.security.auth.Subject;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.codec.binary.Base64;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.policy.authentication.basic.BasicAuthenticationPrincipal;
/**
*
* @version $Rev$ $Date$
*/
public class HttpSecurityUtil {
/**
* Check if Authorization header is available
* @param request
* @param response
* @return
*/
public static boolean hasAuthorizationHeader(HttpServletRequest request) {
boolean result = false;
if(request.getHeader("Authorization") != null) {
result = true;
}
return result;
}
/**
*
* @param request
* @param response
* @return
*/
public static String getAuthorizationHeader(HttpServletRequest request) {
return request.getHeader("Authorization");
}
public static Subject getSubject(Message msg){
Subject subject = null;
HttpServletRequest request = null;
for (Object header : msg.getHeaders()){
if (header instanceof Subject){
subject = (Subject)header;
break;
} else if( header instanceof HttpServletRequest) {
request = (HttpServletRequest) header;
}
}
//if there is no subject, but request is available
//try to build a subject from authorization header
if (subject == null & request != null) {
if ( hasAuthorizationHeader(request)) {
subject = getSubject(getAuthorizationHeader(request));
}
}
if (subject == null){
subject = new Subject();
msg.getHeaders().add(subject);
}
return subject;
}
public static Subject getSubject(String httpAuthorizationHeader){
// get the security context
Subject subject = new Subject();
String user = null;
String password = null;
if (httpAuthorizationHeader != null) {
StringTokenizer tokens = new StringTokenizer(httpAuthorizationHeader);
if (tokens.hasMoreTokens()) {
String basic = tokens.nextToken();
if (basic.equalsIgnoreCase("Basic")) {
String credentials = tokens.nextToken();
String userAndPassword = new String(Base64.decodeBase64(credentials.getBytes()));
int colon = userAndPassword.indexOf(":");
if (colon != -1) {
user = userAndPassword.substring(0, colon);
password = userAndPassword.substring(colon + 1);
}
}
}
}
if(user != null && password != null) {
BasicAuthenticationPrincipal principal = new BasicAuthenticationPrincipal(user, password);
subject.getPrincipals().add(principal);
}
return subject;
}
}
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