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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.List;
import com.att.research.xacml.api.DataType;
import com.att.research.xacml.api.DataTypeException;
import com.att.research.xacml.api.Identifier;
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;
/**
* FunctionDefinitionRegexMatch implements {@link com.att.research.xacmlatt.pdp.policy.FunctionDefinition} to
* implement the XACML 'type'-regex-match predicates as functions taking two arguments, the first of String,
* representing a regular expression, and the second of the type for that specific predicate,
* and returning a Boolean for whether the regular expression matches the string representation of the second argument.
*
* 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:
* string-regexp-match
* anyURI-regexp-match
* x500Name-regexp-match
* rfc822Name-regexp-match (in sub-class {@link com.att.research.xacmlatt.pdp.std.functions.FunctionDefinitionRFC822NameMatch} )
* ipAddress-regexp-match
* dnsName-regexp-match
*
*
* @author glenngriffin
* @version $Revision: 1.1 $
*
* @param the java class for the data type of the function Input arguments
*/
public class FunctionDefinitionRegexpMatch extends FunctionDefinitionBase {
/**
* Constructor - need dataTypeArgs input because of java Generic type-erasure during compilation.
*
* @param idIn
* @param dataTypeArgsIn
*/
public FunctionDefinitionRegexpMatch(Identifier idIn, DataType dataTypeArgsIn) {
super(idIn, DataTypes.DT_BOOLEAN, dataTypeArgsIn, false);
}
@Override
public ExpressionResult evaluate(EvaluationContext evaluationContext, List arguments) {
if (arguments == null || arguments.size() != 2) {
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, this.getShortFunctionId() + " Expected 2 arguments, got " +
((arguments == null) ? "null" : arguments.size()) ));
}
// get the regular expression
FunctionArgument regexpArgument = arguments.get(0);
ConvertedArgument convertedArgument = new ConvertedArgument(regexpArgument, DataTypes.DT_STRING, false);
if ( ! convertedArgument.isOk()) {
return ExpressionResult.newError(getFunctionStatus(convertedArgument.getStatus()));
}
// String regexpValue = (String)regexpArgument.getValue().getValue();
String regexpValue = convertedArgument.getValue();
// now get the element to match
FunctionArgument elementArgument = arguments.get(1);
ConvertedArgument convertedElement = new ConvertedArgument(elementArgument, this.getDataTypeArgs(), false);
if ( ! convertedElement.isOk()) {
return ExpressionResult.newError(getFunctionStatus(convertedElement.getStatus()));
}
I elementValueObject = convertedElement.getValue();
String elementValueString;
try {
elementValueString = this.getDataTypeArgs().toStringValue(elementValueObject);
} catch (DataTypeException e) {
String message = e.getMessage();
if (e.getCause() != null) {
message = e.getCause().getMessage();
}
return ExpressionResult.newError(new StdStatus(StdStatusCode.STATUS_CODE_PROCESSING_ERROR, this.getShortFunctionId() + " " + message));
}
// ConvertedArgument checks for null value, so do not need to do again here
if (elementValueString.matches(regexpValue)) {
return ER_TRUE;
} else {
return ER_FALSE;
}
}
}