| /* |
| * 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. |
| */ |
| package org.apache.knox.gateway.securequery; |
| |
| import org.apache.commons.codec.binary.Base64; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteEnvironment; |
| import org.apache.knox.gateway.filter.rewrite.spi.UrlRewriteContext; |
| import org.apache.knox.gateway.filter.rewrite.spi.UrlRewriteStepProcessor; |
| import org.apache.knox.gateway.filter.rewrite.spi.UrlRewriteStepStatus; |
| import org.apache.knox.gateway.util.urltemplate.Builder; |
| import org.apache.knox.gateway.util.urltemplate.Query; |
| import org.apache.knox.gateway.util.urltemplate.Template; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Map; |
| import java.util.StringTokenizer; |
| |
| public class SecureQueryDecodeProcessor implements |
| UrlRewriteStepProcessor<SecureQueryDecodeDescriptor> { |
| |
| private static final String ENCODED_PARAMETER_NAME = "_"; |
| |
| @Override |
| public String getType() { |
| return SecureQueryDecodeDescriptor.STEP_NAME; |
| } |
| |
| @Override |
| public void initialize( UrlRewriteEnvironment environment, SecureQueryDecodeDescriptor descriptor ) throws Exception { |
| } |
| |
| @Override |
| public UrlRewriteStepStatus process( UrlRewriteContext context ) throws Exception { |
| //TODO: Need some way to get a reference to the keystore service and the encryption key in particular. |
| Template currUrl = context.getCurrentUrl(); |
| Builder newUrl = new Builder( currUrl ); |
| Map<String,Query> map = newUrl.getQuery(); |
| Query query = map.remove( ENCODED_PARAMETER_NAME ); |
| if( query != null ) { |
| String value = query.getFirstValue().getPattern(); |
| value = decode( value ); |
| StringTokenizer outerParser = new StringTokenizer( value, "&" ); |
| while( outerParser.hasMoreTokens() ) { |
| String pair = outerParser.nextToken(); |
| StringTokenizer innerParser = new StringTokenizer( pair, "=" ); |
| if( innerParser.hasMoreTokens() ) { |
| String paramName = innerParser.nextToken(); |
| if( innerParser.hasMoreTokens() ) { |
| String paramValue = innerParser.nextToken(); |
| // Need to take out any existing query param. |
| // If we don't then someone could override something in the encoded param. |
| map.remove( paramName ); |
| newUrl.addQuery( paramName, "", paramValue, true ); |
| } else { |
| newUrl.addQuery( paramName, "", null, true ); |
| } |
| } |
| } |
| context.setCurrentUrl( newUrl.build() ); |
| } |
| return UrlRewriteStepStatus.SUCCESS; |
| } |
| |
| @Override |
| public void destroy() { |
| } |
| |
| private static String decode( String string ) throws UnsupportedEncodingException { |
| return new String( Base64.decodeBase64( string ), StandardCharsets.UTF_8 ); |
| } |
| |
| } |