org.apache.hadoop.gateway.encrypturi.impl.EncryptUriProcessor.java Source code

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/**
 * 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.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 EncryptUriProcessor implements UrlRewriteStepProcessor<EncryptUriDescriptor> {

    private String clusterName;
    private CryptoService cryptoService;
    private String template;
    private String param;

    @Override
    public String getType() {
        return EncryptUriDescriptor.STEP_NAME;
    }

    @Override
    public void initialize(UrlRewriteEnvironment environment, EncryptUriDescriptor 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);
        template = descriptor.getTemplate();
        param = descriptor.getParam();
    }

    @Override
    public UrlRewriteStepStatus process(UrlRewriteContext context) throws Exception {
        if (param != null && !param.isEmpty() && template != null && !template.isEmpty()) {
            Template uri = Parser.parseTemplate(template);
            String resolvedTemplate = Expander.expandToString(uri, context.getParameters(), context.getEvaluator());
            if (resolvedTemplate != null && !resolvedTemplate.isEmpty()) {
                String endcoedUrl = encode(resolvedTemplate);
                EncryptStepContextParams params = new EncryptStepContextParams();
                params.addParam(param, Arrays.asList(endcoedUrl));
                context.addParameters(params);
                return UrlRewriteStepStatus.SUCCESS;
            }
        }
        return UrlRewriteStepStatus.FAILURE;
    }

    @Override
    public void destroy() {
    }

    private String encode(String string) throws UnsupportedEncodingException {
        EncryptionResult result = cryptoService.encryptForCluster(clusterName, EncryptUriDescriptor.PASSWORD_ALIAS,
                string.getBytes("UTF-8"));
        string = Base64.encodeBase64URLSafeString(result.toByteAray());
        return string;
    }

}