/*
* 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);
}
}
}