cng-validate-go

cnh_verifier_digit.go

// ATENTION - INVALID CODE
// This code is an attempt to create a valid calculation of a CNH verifier digit

package main

import (
	"fmt"
	"strconv"
)

var list = []string{
	"80255838330",
	"07964414045",
	"36363798091",
	"87583985760", // r1=6 e r2=0
	"37493111906", // r1=0 e r2=6
	"92174299000", // r1=10 e r2=2
	"58117335901", // r1=10 e r2=3
	"08530846740", // r1=4 e r2=10
	"29742991300", // r1=10 e r2=10
	"48929785301", // r1=10 e r2=1 gera erro
	"89010942604",
	"94683104108", // r1=0 e r2=8
	"96644878310", // r1=1 e r2=10
	"88853444102", // r1=10 e r2=0 gera erro
	"88853444109", // deve ser válido
	"74258825400",
	"33206482401",
	"36278875701",
	"00997215200",
	"88267431500",
	"18848472705",
	"48240927404",
	"34470769500",
}

func main() {
	for _, item := range list {
		calculate(item)
	}

}

func calculate(value string) {
	t1 := 0
	t2 := 0
	numbers, err := StringToIntArray(value[:9])
	if err != nil {
		panic(err)
	}
	dsr1 := 9
	dsr2 := 1
	for _, num := range numbers {
		t1 += num * dsr1
		t2 += num * dsr2
		dsr1--
		dsr2++

	}
	rest1 := t1 % 11
	rest2 := t2 % 11
	dv1 := rest1
	dv2 := rest2
	if rest1 > 9 {
		dv1 = 0
		// if rest2-2 < 0 {
		// 	dv2 += 9
		// }
		// if rest2-2 >= 0 {
		//	dv2 -= 2
		// }
	}

	if rest2 > 9 {
		dv2 = 0
	}
	if rest1 > 9 && dv2 >= 2 {
		dv2 -= 2
	}
	dv := strconv.Itoa(dv1) + strconv.Itoa(dv2)
	if dv != value[9:] {
		fmt.Printf("error no CNH %s, esperado %s - resultado %s\n", value, value[9:], dv)
		fmt.Println("resto 1 ->", rest1)
		fmt.Println("resto 2 ->", rest2)
		fmt.Println("===============================================")
	}

}

func StringToIntArray(s string) ([]int, error) {
	var result []int
	for _, char := range s {
		digit, _ := strconv.Atoi(string(char))
		result = append(result, digit)
	}
	return result, nil
}

/* references:
- https://asmetro.org.br/portalsn/storage/2021/12/RESOLUCAO-cONTRAN-No-886-DE-13-DE-DEZEMBRO-DE-2021-RESOLUCAO-cONTRAN-No-886-DE-13-DE-DEZEMBRO-DE-2021-DOU-Imprensa-Nacional.pdf
- https://www.gov.br/transportes/pt-br/assuntos/transito/conteudo-contran/resolucoes/resolucao59820162.pdf
- https://siga0984.wordpress.com/2019/05/01/algoritmos-validacao-de-cnh/
- https://github.com/vn-labs/BRdocs-validation/blob/main/br_docs/validators/cnh.py
- https://github.com/danielsouza/validarCNH/blob/master/ValidarCNH.java
- https://github.com/ogilvieira/validator-brasil/blob/main/src/isCNH.ts
-