/* * Copyright (c) 2005-2013, WSO2 Inc. (http://www.wso2.org) All Rights Reserved. * * WSO2 Inc. 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.wso2.carbon.mediation.security.vault.xpath; import java.util.List; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.synapse.SynapseConstants; import org.jaxen.Context; import org.jaxen.Function; import org.jaxen.FunctionCallException; import org.jaxen.function.StringFunction; import org.wso2.carbon.mediation.security.vault.SecureVaultLookupHandler; import org.wso2.carbon.mediation.security.vault.SecureVaultLookupHandlerImpl; /** * Implements the XPath extension function synapse:vault-lookup(scope,prop-name) */ public class VaultLookupFunction implements Function { private static final Log log = LogFactory.getLog(VaultLookupFunction.class); private static final Log trace = LogFactory.getLog(SynapseConstants.TRACE_LOGGER); public static final String NULL_STRING = ""; /** Synapse Message context */ private final org.apache.synapse.MessageContext synCtx; public VaultLookupFunction(org.apache.synapse.MessageContext synCtx) { this.synCtx = synCtx; } /** * Returns the string value of the property which is get from the * corresponding context to the provided scope . * vault-lookup('xxx') * * @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 */ @Override public Object call(Context context, List args) throws FunctionCallException { boolean traceOn = synCtx.getTracingState() == SynapseConstants.TRACING_ON; boolean traceOrDebugOn = traceOn || log.isDebugEnabled(); if (args == null || args.size() == 0) { if (traceOrDebugOn) { traceOrDebug(traceOn, "vault value for lookup is not specified"); } return NULL_STRING; } String argOne = StringFunction.evaluate(args.get(0), context.getNavigator()); SecureVaultLookupHandler mediationSecurity; try { mediationSecurity = SecureVaultLookupHandlerImpl.getDefaultSecurityService(); String val = mediationSecurity.evaluate(argOne, synCtx); return val; } catch (Exception msg) { throw new FunctionCallException(msg); } } private void traceOrDebug(boolean traceOn, String msg) { if (traceOn) { trace.info(msg); } if (log.isDebugEnabled()) { log.debug(msg); } } }