org.taverna.server.master.identity.AuthorityDerivedIDMapper.java Source code

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Here is the source code for org.taverna.server.master.identity.AuthorityDerivedIDMapper.java

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/*
 */
package org.taverna.server.master.identity;
/*
 * 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.
 */

import static org.taverna.server.master.defaults.Default.AUTHORITY_PREFIX;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.taverna.server.master.interfaces.LocalIdentityMapper;
import org.taverna.server.master.utils.UsernamePrincipal;

/**
 * Extracts the local user id from the set of Spring Security authorities
 * granted to the current user. This is done by scanning the set of authorities
 * to see if any of them start with the substring listed in the <tt>prefix</tt>
 * property; the username is the rest of the authority string in that case.
 * 
 * @author Donal Fellows
 */
public class AuthorityDerivedIDMapper implements LocalIdentityMapper {
    private String prefix = AUTHORITY_PREFIX;

    public String getPrefix() {
        return prefix;
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }

    @Override
    public String getUsernameForPrincipal(UsernamePrincipal user) {
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();
        if (auth == null || !auth.isAuthenticated())
            return null;
        for (GrantedAuthority authority : auth.getAuthorities()) {
            String token = authority.getAuthority();
            if (token == null)
                continue;
            if (token.startsWith(prefix))
                return token.substring(prefix.length());
        }
        return null;
    }
}