/*
* Copyright (c) 2010 Red Hat, Inc.
*
* 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.
*/
package org.ovirt.engine.api.common.security.auth;
import java.text.MessageFormat;
import java.util.List;
import javax.ws.rs.core.HttpHeaders;
import org.apache.commons.codec.binary.Base64;
public class BasicAuthorizationScheme implements Scheme {
private static final String SCHEME = "Basic";
private static final String CHALLANGE_TEMPLATE = SCHEME + " realm = \"{0}\"";
private static String USER_PASS_SEPARATOR = ":";
private static char UPN_USER_DOMAIN_SEPARATOR = '@';
private static String LEGACY_USER_DOMAIN_SEPARATOR = "\\";
@Override
public String getName() {
return SCHEME;
}
@Override
public String getChallenge(String realm) {
return MessageFormat.format(CHALLANGE_TEMPLATE, realm);
}
@Override
public Principal decode(HttpHeaders headers) {
Principal principal = null;
if (headers != null) {
List<String> auth = headers.getRequestHeader(HttpHeaders.AUTHORIZATION);
if (auth != null && auth.size() > 0) {
String credentials = auth.get(0);
if (credentials.trim().startsWith(SCHEME)) {
principal = decode(credentials);
}
}
}
return principal;
}
private Principal decode(String credentials) {
Principal principal = null;
try {
credentials = credentials.trim().substring(SCHEME.length()).trim();
String userPass = new String(Base64.decodeBase64(credentials));
String[] creds = userPass.split(USER_PASS_SEPARATOR, 2);
if (creds != null && creds.length == 2) {
principal = parse(creds[0], creds[1], getSeparator(creds[0]));
}
} catch (Exception e) {
// let principal remain null
}
return principal;
}
private int getSeparator(String qualified) {
return qualified.indexOf(UPN_USER_DOMAIN_SEPARATOR) != -1
? qualified.indexOf(UPN_USER_DOMAIN_SEPARATOR)
: qualified.indexOf(LEGACY_USER_DOMAIN_SEPARATOR);
}
private Principal parse(String qualified, String password, int index) {
Principal principal = null;
if (index != -1) {
String user = null, domain = null;
if (qualified.charAt(index) == UPN_USER_DOMAIN_SEPARATOR) {
// UPN format: user@domain
user = qualified.substring(0, index);
domain = qualified.substring(index + 1);
} else {
// legacy format: domain\\user
domain = qualified.substring(0, index);
user = qualified.substring(index + 1);
}
principal = new Principal(user, password, domain);
} else {
principal = new Principal(qualified, password);
}
return principal;
}
}