| /* |
| * 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.synapse.util.xpath; |
| |
| import org.jaxen.Function; |
| import org.jaxen.Context; |
| import org.jaxen.FunctionCallException; |
| import org.jaxen.function.StringFunction; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.commons.codec.binary.Base64; |
| |
| import java.util.List; |
| import java.io.UnsupportedEncodingException; |
| |
| /** |
| * Implements the XPath extension function synapse:base64Encode(string) |
| */ |
| public class Base64EncodeFunction implements Function { |
| |
| private static final Log log = LogFactory.getLog(Base64EncodeFunction.class); |
| |
| /** |
| * Returns the base64 encoded string value of the first argument. |
| * |
| * @param context the context at the point in the expression when the function is called |
| * @param args arguments of the functions |
| * @return The string value of a property |
| * @throws FunctionCallException |
| */ |
| public Object call(Context context, List args) throws FunctionCallException { |
| boolean debugOn = log.isDebugEnabled(); |
| |
| if (args == null || args.size() == 0) { |
| if (debugOn) { |
| log.debug("Property key value for lookup is not specified"); |
| } |
| return SynapseXPathConstants.NULL_STRING; |
| } |
| |
| int size = args.size(); |
| if (size == 1) { |
| // get the first argument, it can be a function returning a string as well |
| String value = StringFunction.evaluate(args.get(0), context.getNavigator()); |
| |
| // use the default UTF-8 encoding |
| return encode(debugOn, SynapseXPathConstants.DEFAULT_CHARSET, value); |
| } else if (size == 2) { |
| // get the first argument, it can be a function returning a string as well |
| String value = StringFunction.evaluate(args.get(0), context.getNavigator()); |
| |
| // encoding is in the second argument |
| String encoding = StringFunction.evaluate(args.get(1), context.getNavigator()); |
| |
| return encode(debugOn, encoding, value); |
| } else { |
| if (debugOn) { |
| log.debug("base64Encode function expects only one argument, returning empty string"); |
| } |
| } |
| // return empty string if the arguments are wrong |
| return SynapseXPathConstants.NULL_STRING; |
| } |
| |
| private Object encode(boolean debugOn, String encoding, String value) |
| throws FunctionCallException { |
| if (value == null || "".equals(value)) { |
| if (debugOn) { |
| log.debug("Non emprty string value should be provided for encoding"); |
| } |
| |
| return SynapseXPathConstants.NULL_STRING; |
| } |
| |
| byte[] encodedValue; |
| try { |
| encodedValue = new Base64().encode(value.getBytes(encoding)); |
| } catch (UnsupportedEncodingException e) { |
| String msg = "Unsupported Encoding"; |
| log.error(msg, e); |
| throw new FunctionCallException(msg, e); |
| } |
| |
| String encodedString; |
| try { |
| encodedString = new String(encodedValue, encoding); |
| } catch (UnsupportedEncodingException e) { |
| String msg = "Unsupported Encoding"; |
| log.error(msg, e); |
| throw new FunctionCallException(msg, e); |
| } |
| |
| if (debugOn) { |
| log.debug("Converted string: " + value + " with encoding: " + encoding + |
| " to base64 encoded value: " + encodedString); |
| } |
| |
| return encodedString; |
| } |
| } |