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reference.go
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reference.go
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/**
* Copyright © 2022, Staufi Tech - Switzerland
* All rights reserved.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package utils
import (
"errors"
"fmt"
"math"
"strconv"
"strings"
"github.com/ChrIgiSta/swiss-qr-bill/qr"
)
var QR_MATRIX = [10][10]int{
{0, 9, 4, 6, 8, 2, 7, 1, 3, 5},
{9, 4, 6, 8, 2, 7, 1, 3, 5, 0},
{4, 6, 8, 2, 7, 1, 3, 5, 0, 9},
{6, 8, 2, 7, 1, 3, 5, 0, 9, 4},
{8, 2, 7, 1, 3, 5, 0, 9, 4, 6},
{2, 7, 1, 3, 5, 0, 9, 4, 6, 8},
{7, 1, 3, 5, 0, 9, 4, 6, 8, 2},
{1, 3, 5, 0, 9, 4, 6, 8, 2, 7},
{3, 5, 0, 9, 4, 6, 8, 2, 7, 1},
{5, 0, 9, 4, 6, 8, 2, 7, 1, 3},
}
func ValidateReference(referenceType string, reference string) error {
reference = strings.ReplaceAll(reference, " ", "")
switch referenceType {
case qr.REFERENCE_TYPE_NO_REF:
if reference == "" {
return nil
}
return errors.New("reference set for non ref type")
case qr.REFERENCE_TYPE_QR:
// 26 characters, 1 checksum mod 10 recursive
if len(reference) != 27 {
return errors.New("QR ref should be a 27 dig long string")
}
pShould, err := GetQrReferenceCheckNum(reference[:26])
if err != nil {
return err
}
pIs := string(reference[26])
if pShould != pIs {
errorMsg := fmt.Sprintf("checksum of qr ref isn't valid (is: %s, should: %s)", pIs, pShould)
return errors.New(errorMsg)
}
case qr.REFERENCE_TYPE_CREDITOR:
// ISO-11649, mod 97-10
return errors.New("ref credo not implemented")
default:
return errors.New("unknown ref type")
}
return nil
}
func GetQrReferenceCheckNum(qrReference string) (string, error) {
z := 0
if len(qrReference) != 26 {
fmt.Println(len(qrReference))
return "", errors.New("QR ref should be a 26 dig long string (without checknum)")
}
for i := 0; i < 26; i++ {
num, err := strconv.Atoi(string(qrReference[i]))
if err != nil {
return "", errors.New("QR ref contains characters.")
}
z = QR_MATRIX[z][num]
}
chkNum := math.Mod(float64(10-z), 10)
return strconv.Itoa(int(chkNum)), nil
}