89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package cuit
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import (
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"regexp"
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"strconv"
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"strings"
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"github.com/gabdlr/api-cuit-go/utils"
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)
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const CUIT_REGEX = `^([\d]{2}-[\d]{8}-[\d]{1}|[\d]{11})$`
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var CUIT_TYPES = map[uint8]bool{
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30: true,
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33: true,
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34: true,
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}
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func IsValid(cuit string) (isValidCuit bool) {
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if validateFormat(cuit) {
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cuit = standardizeCuit(cuit)
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if validateCuitType(cuit) {
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isValidCuit = validateWithVerifierDigit(cuit)
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}
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}
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return isValidCuit
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}
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func standardizeCuit(cuit string) string {
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if len(cuit) > 11 {
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cuit = strings.ReplaceAll(cuit, "-", "")
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}
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return cuit
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}
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func validateWithVerifierDigit(cuit string) bool {
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verificationResult := false
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toVerify := utils.ReverseStringWithBuffer(cuit[:10])
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weightUpResult := 0
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weightUpFactorCounter := -1
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weightUpCheckFactor := []int{2, 3, 4, 5, 6, 7}
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verifierDigit, err := strconv.Atoi(cuit[len(cuit)-1:])
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if err != nil {
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return false
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}
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for i := range 10 {
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if i%6 == 0 {
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weightUpFactorCounter += 1
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}
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weightUp, err := strconv.Atoi(string(toVerify[i]))
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if err != nil {
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return verificationResult
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}
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weightUpResult += weightUp * weightUpCheckFactor[i-6*weightUpFactorCounter]
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}
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mod11WeightupResult := weightUpResult % 11
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switch mod11WeightupResult {
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case 11:
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verificationResult = verifierDigit == 0
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case 10:
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verificationResult = verifierDigit == 9
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default:
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verificationResult = verifierDigit == 11-mod11WeightupResult
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}
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return verificationResult
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}
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func validateCuitType(cuit string) bool {
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validationResult := false
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cuitType, err := strconv.Atoi(cuit[:2])
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if err == nil {
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validationResult = CUIT_TYPES[uint8(cuitType)]
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}
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return validationResult
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}
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func validateFormat(cuit string) bool {
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regexExp, err := regexp.Compile(CUIT_REGEX)
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if err == nil {
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return regexExp.MatchString(cuit)
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}
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return false
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}
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