/**
* 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.encrypturi.impl;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import org.apache.commons.codec.binary.Base64;
import org.apache.hadoop.gateway.encrypturi.EncryptStepContextParams;
import org.apache.hadoop.gateway.encrypturi.api.DecryptUriDescriptor;
import org.apache.hadoop.gateway.encrypturi.api.EncryptUriDescriptor;
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.services.GatewayServices;
import org.apache.hadoop.gateway.services.security.CryptoService;
import org.apache.hadoop.gateway.services.security.EncryptionResult;
import org.apache.hadoop.gateway.util.urltemplate.Expander;
import org.apache.hadoop.gateway.util.urltemplate.Parser;
import org.apache.hadoop.gateway.util.urltemplate.Template;
public class DecryptUriProcessor
implements UrlRewriteStepProcessor<DecryptUriDescriptor> {
private String clusterName;
private CryptoService cryptoService;
private String param;
@Override
public String getType() {
return DecryptUriDescriptor.STEP_NAME;
}
@Override
public void initialize( UrlRewriteEnvironment environment, DecryptUriDescriptor descriptor ) throws Exception {
clusterName = environment.getAttribute( GatewayServices.GATEWAY_CLUSTER_ATTRIBUTE );
GatewayServices services = environment.getAttribute(GatewayServices.GATEWAY_SERVICES_ATTRIBUTE);
cryptoService = (CryptoService) services.getService(GatewayServices.CRYPTO_SERVICE);
param = descriptor.getParam();
}
@Override
public UrlRewriteStepStatus process( UrlRewriteContext context ) throws Exception {
if( param != null && !param.isEmpty() ) {
Template template = Parser.parse( "{" + param + "}" );
String resolvedTemplate = Expander.expandToString( template, context.getParameters(), context.getEvaluator() );
String url = decode( resolvedTemplate );
EncryptStepContextParams params = new EncryptStepContextParams();
params.addParam( param, Arrays.asList( url ) );
context.addParameters( params );
return UrlRewriteStepStatus.SUCCESS;
}
return UrlRewriteStepStatus.FAILURE;
}
@Override
public void destroy() {
}
private String decode( String string ) throws UnsupportedEncodingException {
byte[] bytes = Base64.decodeBase64( string );
EncryptionResult result = EncryptionResult.fromByteArray(bytes);
byte[] clear = cryptoService.decryptForCluster(clusterName,
EncryptUriDescriptor.PASSWORD_ALIAS,
result.cipher,
result.iv,
result.salt);
if (clear != null) {
return new String(clear);
}
return null;
}
}