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 */ 018package org.apache.hadoop.hdfs.web; 019 020import java.net.URI; 021import java.util.List; 022import java.util.Map; 023 024import javax.ws.rs.core.MultivaluedMap; 025import javax.ws.rs.core.UriBuilder; 026 027import com.sun.jersey.spi.container.ContainerRequest; 028import com.sun.jersey.spi.container.ContainerRequestFilter; 029import com.sun.jersey.spi.container.ContainerResponseFilter; 030import com.sun.jersey.spi.container.ResourceFilter; 031 032/** 033 * A filter to change parameter names to lower cases 034 * so that parameter names are considered as case insensitive. 035 */ 036public class ParamFilter implements ResourceFilter { 037 private static final ContainerRequestFilter LOWER_CASE 038 = new ContainerRequestFilter() { 039 @Override 040 public ContainerRequest filter(final ContainerRequest request) { 041 final MultivaluedMap<String, String> parameters = request.getQueryParameters(); 042 if (containsUpperCase(parameters.keySet())) { 043 //rebuild URI 044 final URI lower = rebuildQuery(request.getRequestUri(), parameters); 045 request.setUris(request.getBaseUri(), lower); 046 } 047 return request; 048 } 049 }; 050 051 @Override 052 public ContainerRequestFilter getRequestFilter() { 053 return LOWER_CASE; 054 } 055 056 @Override 057 public ContainerResponseFilter getResponseFilter() { 058 return null; 059 } 060 061 /** Do the strings contain upper case letters? */ 062 static boolean containsUpperCase(final Iterable<String> strings) { 063 for(String s : strings) { 064 for(int i = 0; i < s.length(); i++) { 065 if (Character.isUpperCase(s.charAt(i))) { 066 return true; 067 } 068 } 069 } 070 return false; 071 } 072 073 /** Rebuild the URI query with lower case parameter names. */ 074 private static URI rebuildQuery(final URI uri, 075 final MultivaluedMap<String, String> parameters) { 076 UriBuilder b = UriBuilder.fromUri(uri).replaceQuery(""); 077 for(Map.Entry<String, List<String>> e : parameters.entrySet()) { 078 final String key = e.getKey().toLowerCase(); 079 for(String v : e.getValue()) { 080 b = b.queryParam(key, v); 081 } 082 } 083 return b.build(); 084 } 085}