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Functions.go
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package xacml
import (
"errors"
"log"
"regexp"
)
const (
functionStringEqual = "urn:oasis:names:tc:xacml:1.0:function:string-equal"
functionStringEqualIgnoreCase = "urn:oasis:names:tc:xacml:1.0:function:string-equal-ignore-case"
functionBooleanEqual = "urn:oasis:names:tc:xacml:1.0:function:boolean-equal"
functionIntegerEqual = "urn:oasis:names:tc:xacml:1.0:function:integer-equal"
functionDoubleEqual = "urn:oasis:names:tc:xacml:1.0:function:double-equal"
functionDateEqual = "urn:oasis:names:tc:xacml:1.0:function:date-equal"
functionTimeEqual = "urn:oasis:names:tc:xacml:1.0:function:time-equal"
functionDateTimeEqual = "urn:oasis:names:tc:xacml:1.0:function:dateTime-equal"
functionDayTimeDurationEqual = "urn:oasis:names:tc:xacml:1.0:function:dayTimeDuration-equal"
functionYearMonthDurationEqual = "urn:oasis:names:tc:xacml:1.0:function:yearMonthDuration-equal"
functionAnyURIEqual = "urn:oasis:names:tc:xacml:1.0:function:anyURI-equal"
functionX500NameEqual = "urn:oasis:names:tc:xacml:1.0:function:x500Name-equal"
functionRFC822NameEqual = "urn:oasis:names:tc:xacml:1.0:function:rfc822Name-equal"
functionHexBinaryEqual = "urn:oasis:names:tc:xacml:1.0:function:hexBinary-equal"
functionBase64BinaryEqual = "urn:oasis:names:tc:xacml:1.0:function:base64Binary-equal"
functionIntegerAdd = "urn:oasis:names:tc:xacml:1.0:function:integer-add"
functionDoubleAdd = "urn:oasis:names:tc:xacml:1.0:function:double-add"
functionIntegerSubtract = "urn:oasis:names:tc:xacml:1.0:function:integer-subtract"
functionDoubleSubtract = "urn:oasis:names:tc:xacml:1.0:function:double-subtract"
functionIntegerMultiply = "urn:oasis:names:tc:xacml:1.0:function:integer-multiply"
functionDoubleMultiply = "urn:oasis:names:tc:xacml:1.0:function:double-multiply"
functionIntegerDivide = "urn:oasis:names:tc:xacml:1.0:function:integer-divide"
functionDoubleDivide = "urn:oasis:names:tc:xacml:1.0:function:double-divide"
functionIntegerMod = "urn:oasis:names:tc:xacml:1.0:function:integer-mod"
functionIntegerAbs = "urn:oasis:names:tc:xacml:1.0:function:integer-abs"
functionDoubleAbs = "urn:oasis:names:tc:xacml:1.0:function:double-abs"
functionRound = "urn:oasis:names:tc:xacml:1.0:function:round"
functionFloor = "urn:oasis:names:tc:xacml:1.0:function:floor"
functionStringNormalizeSpace = "urn:oasis:names:tc:xacml:1.0:function:string-normalize-space"
functionStringNormalizeToLowerCase = "urn:oasis:names:tc:xacml:1.0:function:string-normalize-to-lower-case"
functionDoubleToInteger = "urn:oasis:names:tc:xacml:1.0:function:double-to-integer"
functionIntegerToDouble = "urn:oasis:names:tc:xacml:1.0:function:integer-to-double"
functionOr = "urn:oasis:names:tc:xacml:1.0:function:or"
functionAnd = "urn:oasis:names:tc:xacml:1.0:function:and"
functionNOf = "urn:oasis:names:tc:xacml:1.0:function:n-of"
functionNot = "urn:oasis:names:tc:xacml:1.0:function:not"
functionIntegerGreaterThan = "urn:oasis:names:tc:xacml:1.0:function:integer-greater-than"
functionIntegerGreaterThanOrEqual = "urn:oasis:names:tc:xacml:1.0:function:integer-greater-than-or-equal"
functionIntegerLessThan = "urn:oasis:names:tc:xacml:1.0:function:integer-less-than"
functionIntegerLessThanOrEqual = "urn:oasis:names:tc:xacml:1.0:function:integer-less-than-or-equal"
functionDoubleGreaterThan = "urn:oasis:names:tc:xacml:1.0:function:double-greater-than"
functionDoubleGreaterThanOrEqual = "urn:oasis:names:tc:xacml:1.0:function:double-greater-than-or-equal"
functionDoubleLessThan = "urn:oasis:names:tc:xacml:1.0:function:double-less-than"
functionDoubleLessThanOrEqual = "urn:oasis:names:tc:xacml:1.0:function:double-less-than-or-equal"
functionStringConcatenate = "urn:oasis:names:tc:xacml:2.0:function:string-concatenate"
functionBooleanFromString = "urn:oasis:names:tc:xacml:3.0:function:boolean-from-string"
functionStringFromBoolean = "urn:oasis:names:tc:xacml:3.0:function:string-from-boolean"
functionIntegerFromString = "urn:oasis:names:tc:xacml:3.0:function:integer-from-string"
functionStringFromInteger = "urn:oasis:names:tc:xacml:3.0:function:string-from-integer"
functionDoubleFromString = "urn:oasis:names:tc:xacml:3.0:function:double-from-string"
functionStringFromDouble = "urn:oasis:names:tc:xacml:3.0:function:string-from-double"
functionStringStartsWith = "urn:oasis:names:tc:xacml:3.0:function:string-starts-with"
functionStringEndsWith = "urn:oasis:names:tc:xacml:3.0:function:string-ends-with"
functionStringContains = "urn:oasis:names:tc:xacml:3.0:function:string-contains"
functionStringSubString = "urn:oasis:names:tc:xacml:3.0:function:string-substring"
functionStringOneAndOnly = "urn:oasis:names:tc:xacml:3.0:function:string-one-and-only"
functionStringBagSize = "urn:oasis:names:tc:xacml:3.0:function:string-bag-size"
functionStringIsIn = "urn:oasis:names:tc:xacml:3.0:function:string-is-in"
functionStringBag = "urn:oasis:names:tc:xacml:3.0:function:string-bag"
functionStringIntersection = "urn:oasis:names:tc:xacml:3.0:function:string-intersection"
functionStringAtLeastOneMemberOf = "urn:oasis:names:tc:xacml:3.0:function:string-at-least-one-member-of"
functionStringUnion = "urn:oasis:names:tc:xacml:3.0:function:string-union"
functionStringSubset = "urn:oasis:names:tc:xacml:3.0:function:string-subset"
functionStringSetEquals = "urn:oasis:names:tc:xacml:3.0:function:string-set-equals"
functionStringRegExpMatch = "urn:oasis:names:tc:xacml:1.0:function:string-regexp-match"
functionAnyURIRegExpMatch = "urn:oasis:names:tc:xacml:1.0:function:anyURI-regexp-match"
functionIpAddressRegExpMatch = "urn:oasis:names:tc:xacml:1.0:function:ipAddress-regexp-match"
functionDNSNameRegExpMatch = "urn:oasis:names:tc:xacml:1.0:function:dnsName-regexp-match"
)
func applyFunction(functionId string, args ...interface{}) (interface{}, error) {
switch functionId {
case functionStringEqual:
return stringEqual(args[0], args[1])
case functionBooleanEqual:
return booleanEqual(args[0], args[1])
case functionIntegerEqual:
return integerEqual(args[0], args[1])
case functionStringOneAndOnly:
return stringOneAndOnly(args[0])
case functionStringBagSize:
return stringBagSize(args[0])
case functionStringIsIn:
return stringIsIn(args[0], args[1])
case functionStringBag:
return stringBag(args...)
case functionStringRegExpMatch:
return stringRegExpMatch(args[0], args[1])
default:
log.Println("Unknown or Unsupported Function: ", functionId)
return false, errors.New("Unknown or Unsupported Function")
}
}
func applyMatchFunction(functionId string, attributeOne, attributeTwo interface{}) (bool, error) {
ret, err := applyFunction(functionId, attributeOne, attributeTwo)
if err != nil {
return false, err
}
retb, _ := ret.(bool)
return retb, err
}
func stringEqual(attributeOne, attributeTwo interface{}) (bool, error) {
a1, ok := attributeOne.(string)
if !ok {
return false, errors.New("Invalid attributeOne type")
}
a2, ok := attributeTwo.(string)
if !ok {
return false, errors.New("Invalid attributeTwo type")
}
return a1 == a2, nil
}
func stringOneAndOnly(attributeOne interface{}) (string, error) {
attributeArray, ok := attributeOne.([]interface{})
if !ok {
return "", errors.New("Argument must be an array")
}
if len(attributeArray) > 1 {
return "", errors.New("Argument must be an array with only one value")
}
stringVal, ok := attributeArray[0].(string)
if !ok {
return "", errors.New("Each member of the array must be a string")
}
return stringVal, nil
}
func stringBagSize(attributeOne interface{}) (int64, error) {
attributeArray, ok := attributeOne.([]interface{})
if !ok {
return 0, errors.New("Argument must be an array")
}
return int64(len(attributeArray)), nil
}
func stringIsIn(attributeOne, attributeTwo interface{}) (bool, error) {
//log.Println(attributeOne)
//log.Println(attributeTwo)
a1, ok := attributeOne.(string)
if !ok {
return false, errors.New("First argument must be a string")
}
attributeArray, ok := attributeTwo.([]interface{})
if !ok {
attributeValue, ok := attributeTwo.(string)
if !ok {
return false, errors.New("Second argument must be an array, or a string")
}
attributeArray = append(attributeArray, attributeValue)
}
for _, s := range attributeArray {
ret, err := stringEqual(a1, s)
if err != nil {
continue
}
if ret {
return true, nil
}
}
return false, nil
}
func stringBag(attributes ...interface{}) ([]interface{}, error) {
ret := make([]interface{}, 0)
for _, attr := range attributes {
if str, ok := attr.(string); ok {
ret = append(ret, str)
}
}
return ret, nil
}
func stringRegExpMatch(attributeOne, attributeTwo interface{}) (bool, error) {
a1, ok := attributeOne.(string)
if !ok {
return false, errors.New("Invalid attributeOne type")
}
a2, ok := attributeTwo.(string)
if !ok {
return false, errors.New("Invalid attributeTwo type")
}
return regexp.MatchString(a1, a2)
}
func booleanEqual(attributeOne, attributeTwo interface{}) (bool, error) {
a1, ok := attributeOne.(bool)
if !ok {
return false, errors.New("Invalid attributeOne type")
}
a2, ok := attributeTwo.(bool)
if !ok {
return false, errors.New("Invalid attributeTwo type")
}
return a1 == a2, nil
}
func integerEqual(attributeOne, attributeTwo interface{}) (bool, error) {
a1, ok := attributeOne.(int64)
if !ok {
return false, errors.New("Invalid attributeOne type")
}
a2, ok := attributeTwo.(int64)
if !ok {
return false, errors.New("Invalid attributeTwo type")
}
return a1 == a2, nil
}