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ATT reference implementation of XACML PDP engine
/*
*
* Copyright (c) 2013,2019 AT&T Knowledge Ventures
* SPDX-License-Identifier: MIT
*/
package com.att.research.xacmlatt.pdp.std.functions;
import java.util.ArrayList;
import java.util.List;
import com.att.research.xacml.api.DataType;
import com.att.research.xacml.api.Identifier;
import com.att.research.xacml.api.Status;
import com.att.research.xacml.std.StdAttributeValue;
import com.att.research.xacml.std.StdStatus;
import com.att.research.xacml.std.StdStatusCode;
import com.att.research.xacml.std.datatypes.DataTypes;
import com.att.research.xacmlatt.pdp.eval.EvaluationContext;
import com.att.research.xacmlatt.pdp.policy.ExpressionResult;
import com.att.research.xacmlatt.pdp.policy.FunctionArgument;
/**
* FunctionDefinitionNumberTypeConversion extends {@link com.att.research.xacmlatt.pdp.std.functions.FunctionDefinitionHomogeneousSimple} to
* implement the XACML predicates for converting String to DataType and vice versa.
*
* In the first implementation of XACML we had separate files for each XACML Function.
* This release combines multiple Functions in fewer files to minimize code duplication.
* This file supports the following XACML codes:
* boolean-from-string
* string-from-boolean
* integer-from-string
* string-from-integer
* double-from-string
* string-from-double
* time-from-string
* string-from-time
* date-from-string
* string-from-date
* dateTime-from-string
* string-from-dateTime
* anyURI-from-string
* string-from-anyURI
* dayTimeDuration-from-string
* string-from-dayTimeDuration
* yearMonthDuration-from-string
* string-from-yearMonthDuration
* x500Name-from-string
* string-from-x500Name
* rfc822Name-from-string
* string-from-rfc822Name
* ipAddress-from-string
* string-from-ipAddress
* dnsName-from-string
* string-from-dnsName
*
* @author glenngriffin
* @version $Revision: 1.1 $
*
* @param the java class for the data type of the function Output
* @param the java class for the data type of the function Input argument
*/
public class FunctionDefinitionStringConversion extends FunctionDefinitionHomogeneousSimple {
public FunctionDefinitionStringConversion(Identifier idIn, DataType outputType, DataType argType) {
super(idIn, outputType, argType, 1);
}
@Override
public ExpressionResult evaluate(EvaluationContext evaluationContext, List arguments) {
List convertedArguments = new ArrayList();
Status status = this.validateArguments(arguments, convertedArguments);
/*
* If the function arguments are not correct, just return an error status immediately
*/
if (!status.getStatusCode().equals(StdStatusCode.STATUS_CODE_OK)) {
return ExpressionResult.newError(getFunctionStatus(status));
}
/*
* Do different conversion depending on which way we are going (to/from String)
*/
if (this.getDataTypeId().equals(DataTypes.DT_STRING.getId())) {
// converting TO String
try {
String output = this.getDataTypeArgs().toStringValue(convertedArguments.get(0));
return ExpressionResult.newSingle(new StdAttributeValue(this.getDataTypeId(), output));
} catch (Exception e) {
String message = e.getMessage();
if (e.getCause() != null) {
message = e.getCause().getMessage();
}
// untested - not clear how this could happen
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, this.getShortFunctionId() + " " + message));
}
} else {
// converting FROM String to object of DataType
try {
O output = this.getDataType().convert(convertedArguments.get(0));
return ExpressionResult.newSingle(new StdAttributeValue(this.getDataTypeId(), output));
} catch (Exception e) {
String message = e.getMessage();
if (e.getCause() != null) {
message = e.getCause().getMessage();
}
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_SYNTAX_ERROR, this.getShortFunctionId() + " " + message ));
}
}
}
}