/*
* 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.isis.viewer.restfulobjects.server.authentication;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.codec.binary.Base64;
import org.apache.isis.core.commons.authentication.AuthenticationSession;
import org.apache.isis.core.runtime.authentication.AuthenticationManager;
import org.apache.isis.core.runtime.authentication.AuthenticationRequestPassword;
import org.apache.isis.core.runtime.system.context.IsisContext;
import org.apache.isis.core.webapp.auth.AuthenticationSessionStrategyAbstract;
/**
* Implements the HTTP Basic Auth protocol; does not bind the
* {@link AuthenticationSession} onto the {@link HttpSession}.
*/
public class AuthenticationSessionStrategyBasicAuth extends AuthenticationSessionStrategyAbstract {
public static final String HEADER_AUTHORIZATION = "Authorization";
public static final String BASIC_AUTH_PREFIX = "Basic ";
private static Pattern USER_AND_PASSWORD_REGEX = Pattern.compile("^(.+):(.+)$");
@Override
public AuthenticationSession lookupValid(final HttpServletRequest httpServletRequest, final HttpServletResponse httpServletResponse) {
final String digest = getBasicAuthDigest(httpServletRequest);
if (digest == null) {
return null;
}
final String userAndPassword = unencoded(digest);
final Matcher matcher = USER_AND_PASSWORD_REGEX.matcher(userAndPassword);
if (!matcher.matches()) {
return null;
}
final String user = matcher.group(1);
final String password = matcher.group(2);
final AuthenticationRequestPassword request = new AuthenticationRequestPassword(user, password);
final AuthenticationSession authSession =
authenticationManagerFrom(httpServletRequest).authenticate(request);
return authSession;
}
// value should be in the form:
// Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==
String getBasicAuthDigest(final HttpServletRequest httpServletRequest) {
final String authStr = httpServletRequest.getHeader(HEADER_AUTHORIZATION);
return authStr != null &&
authStr.startsWith(BASIC_AUTH_PREFIX)
? authStr.substring(BASIC_AUTH_PREFIX.length())
: null;
}
protected String unencoded(final String encodedDigest) {
return new String(new Base64().decode(encodedDigest.getBytes()));
}
}