/*
* Copyright 2006-2016 the original author or authors.
*
* 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.springframework.security.oauth2.provider.token;
import org.springframework.security.oauth2.common.util.OAuth2Utils;
import org.springframework.security.oauth2.provider.OAuth2Authentication;
import org.springframework.security.oauth2.provider.OAuth2Request;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TreeSet;
/**
* Basic key generator taking into account the client id, scope, resource ids and username (principal name) if they
* exist.
*
* @author Dave Syer
*
*/
public class DefaultAuthenticationKeyGenerator implements AuthenticationKeyGenerator {
private static final String CLIENT_ID = "client_id";
private static final String SCOPE = "scope";
private static final String USERNAME = "username";
public String extractKey(OAuth2Authentication authentication) {
Map<String, String> values = new LinkedHashMap<String, String>();
OAuth2Request authorizationRequest = authentication.getOAuth2Request();
if (!authentication.isClientOnly()) {
values.put(USERNAME, authentication.getName());
}
values.put(CLIENT_ID, authorizationRequest.getClientId());
if (authorizationRequest.getScope() != null) {
values.put(SCOPE, OAuth2Utils.formatParameterList(new TreeSet<String>(authorizationRequest.getScope())));
}
return generateKey(values);
}
protected String generateKey(Map<String, String> values) {
MessageDigest digest;
try {
digest = MessageDigest.getInstance("MD5");
byte[] bytes = digest.digest(values.toString().getBytes("UTF-8"));
return String.format("%032x", new BigInteger(1, bytes));
} catch (NoSuchAlgorithmException nsae) {
throw new IllegalStateException("MD5 algorithm not available. Fatal (should be in the JDK).", nsae);
} catch (UnsupportedEncodingException uee) {
throw new IllegalStateException("UTF-8 encoding not available. Fatal (should be in the JDK).", uee);
}
}
}