/**
* 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.hadoop.gateway.securequery;
import org.apache.commons.codec.binary.Base64;
import org.apache.hadoop.gateway.filter.rewrite.api.UrlRewriteEnvironment;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteContext;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteStepProcessor;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteStepStatus;
import org.apache.hadoop.gateway.util.urltemplate.Parser;
import org.apache.hadoop.gateway.util.urltemplate.Template;
import java.io.UnsupportedEncodingException;
import java.util.List;
public class SecureQueryEncryptProcessor
implements UrlRewriteStepProcessor<SecureQueryEncryptDescriptor> {
private static final String ENCRYPTED_PARAMETER_NAME = "_";
private String clusterName;
@Override
public String getType() {
return SecureQueryEncryptDescriptor.STEP_NAME;
}
@Override
public void initialize( UrlRewriteEnvironment environment, SecureQueryEncryptDescriptor descriptor ) throws Exception {
List<String> values = environment.resolve( "cluster.name" );
if( values != null && values.size() > 0 ) {
this.clusterName = environment.resolve( "cluster.name" ).get( 0 );
}
}
@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 url = context.getCurrentUrl();
String str = url.toString();
String path = str;
String query = null;
int index = str.indexOf( '?' );
if( index >= 0 ) {
path = str.substring( 0, index );
if( index < str.length() ) {
query = str.substring( index + 1 );
}
}
if( query != null ) {
query = encode( query );
url = Parser.parse( path + "?" + ENCRYPTED_PARAMETER_NAME +"=" + query );
context.setCurrentUrl( url );
}
return UrlRewriteStepStatus.SUCCESS;
}
@Override
public void destroy() {
}
private String encode( String string ) throws UnsupportedEncodingException {
string = Base64.encodeBase64String( string.getBytes( "UTF-8" ) );
string = removeTrailingEquals( string );
return string;
}
private static String removeTrailingEquals( String s ) {
int i = s.length()-1;
while( i > 0 && s.charAt( i ) == '=' ) {
i--;
}
return s.substring( 0, i+1 );
}
}