001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.hadoop.hdfs.web.resources;
019    
020    import java.io.IOException;
021    import java.lang.reflect.Type;
022    
023    import javax.servlet.ServletContext;
024    import javax.servlet.http.HttpServletRequest;
025    import javax.ws.rs.core.Context;
026    import javax.ws.rs.ext.Provider;
027    
028    import org.apache.hadoop.conf.Configuration;
029    import org.apache.hadoop.hdfs.server.common.JspHelper;
030    import org.apache.hadoop.security.UserGroupInformation;
031    import org.apache.hadoop.security.UserGroupInformation.AuthenticationMethod;
032    
033    import com.sun.jersey.api.core.HttpContext;
034    import com.sun.jersey.core.spi.component.ComponentContext;
035    import com.sun.jersey.core.spi.component.ComponentScope;
036    import com.sun.jersey.server.impl.inject.AbstractHttpContextInjectable;
037    import com.sun.jersey.spi.inject.Injectable;
038    import com.sun.jersey.spi.inject.InjectableProvider;
039    
040    /** Inject user information to http operations. */
041    @Provider
042    public class UserProvider
043        extends AbstractHttpContextInjectable<UserGroupInformation>
044        implements InjectableProvider<Context, Type> {
045      @Context HttpServletRequest request;
046      @Context ServletContext servletcontext;
047    
048      @Override
049      public UserGroupInformation getValue(final HttpContext context) {
050        final Configuration conf = (Configuration) servletcontext
051            .getAttribute(JspHelper.CURRENT_CONF);
052        try {
053          return JspHelper.getUGI(servletcontext, request, conf,
054              AuthenticationMethod.KERBEROS, false);
055        } catch (IOException e) {
056          throw new SecurityException(
057              "Failed to obtain user group information: " + e, e);
058        }
059      }
060    
061      @Override
062      public ComponentScope getScope() {
063        return ComponentScope.PerRequest;
064      }
065    
066      @Override
067      public Injectable<UserGroupInformation> getInjectable(
068          final ComponentContext componentContext, final Context context,
069          final Type type) {
070        return type.equals(UserGroupInformation.class)? this : null;
071      }
072    }