MyUserAuthenticationConverter.java

/*
 * Copyright 2016 ELIXIR EGA
 *
 * 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 eu.elixir.ega.ebi.dataedge.config;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.oauth2.provider.token.UserAuthenticationConverter;
import org.springframework.util.StringUtils;

import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * @author asenf
 * <p>
 * Changed field from USERNAME to 'user_id' - looking for a fix in MiterID directly!
 */
public class MyUserAuthenticationConverter implements UserAuthenticationConverter {

    private Collection<? extends GrantedAuthority> defaultAuthorities;

    private UserDetailsService userDetailsService;

    // Overwrites default from interface (asenf)
    private String USERNAME = "user_id";

    /**
     * Optional {@link UserDetailsService} to use when extracting an {@link Authentication} from the incoming map.
     *
     * @param userDetailsService the userDetailsService to set
     */
    public void setUserDetailsService(UserDetailsService userDetailsService) {
        this.userDetailsService = userDetailsService;
    }

    /**
     * Default value for authorities if an Authentication is being created and the input has no data for authorities.
     * Note that unless this property is set, the default Authentication created by {@link #extractAuthentication(Map)}
     * will be unauthenticated.
     *
     * @param defaultAuthorities the defaultAuthorities to set. Default null.
     */
    public void setDefaultAuthorities(String[] defaultAuthorities) {
        this.defaultAuthorities = AuthorityUtils.commaSeparatedStringToAuthorityList(StringUtils
                .arrayToCommaDelimitedString(defaultAuthorities));
    }

    public Map<String, ?> convertUserAuthentication(Authentication authentication) {
        Map<String, Object> response = new LinkedHashMap<String, Object>();
        response.put(USERNAME, authentication.getName());
        if (authentication.getAuthorities() != null && !authentication.getAuthorities().isEmpty()) {
            response.put(AUTHORITIES, AuthorityUtils.authorityListToSet(authentication.getAuthorities()));
        }
        return response;
    }

    public Authentication extractAuthentication(Map<String, ?> map) {
        if (map.containsKey(USERNAME)) {
            Object principal = map.get(USERNAME);
            Collection<? extends GrantedAuthority> authorities = getAuthorities(map);
            Map<String,  List<String>> datasetFileMapping = getdatasetFileMapping(map, authorities);
            if (userDetailsService != null) {
                UserDetails user = userDetailsService.loadUserByUsername((String) map.get(USERNAME));
                authorities = user.getAuthorities();
                principal = user;
            }
            return new CustomUsernamePasswordAuthenticationToken(principal, "N/A", authorities, datasetFileMapping);
        }
        return null;
    }

    private Collection<? extends GrantedAuthority> getAuthorities(Map<String, ?> map) {
        if (!map.containsKey(AUTHORITIES)) {
            return defaultAuthorities;
        }
        Object authorities = map.get(AUTHORITIES);
        if (authorities instanceof String) {
            return AuthorityUtils.commaSeparatedStringToAuthorityList((String) authorities);
        }
        if (authorities instanceof Collection) {
            return AuthorityUtils.commaSeparatedStringToAuthorityList(StringUtils
                    .collectionToCommaDelimitedString((Collection<?>) authorities));
        }
        throw new IllegalArgumentException("Authorities must be either a String or a Collection");
    }

    private Map<String, List<String>> getdatasetFileMapping(Map<String, ?> map,
            Collection<? extends GrantedAuthority> authorities) {
        Map<String, List<String>> datasetFileMappings = new HashMap<>();
        if (authorities != null && authorities.size() > 0) {
            for (GrantedAuthority grantedAuthority : authorities) {
                String dataSetId = grantedAuthority.getAuthority();
                if (map.containsKey(dataSetId)) {
                    datasetFileMappings.put(dataSetId, (List<String>) map.get(dataSetId));
                }
            }
        }
        return datasetFileMappings;
    }

}