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Michael Stapelberg
2020-06-20 08:01:02 +02:00
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package main
import (
"log"
"github.com/stapelberg/qrbill"
)
func logic() error {
return qrbill.Generate()
//return nil
}
func main() {
if err := logic(); err != nil {
log.Fatal(err)
}
}

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module github.com/stapelberg/qrbill
go 1.14
require (
github.com/aaronarduino/goqrsvg v0.0.0-20170617203649-603647895681
github.com/ajstarks/svgo v0.0.0-20200320125537-f189e35d30ca
github.com/boombuler/barcode v1.0.0
github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
)

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github.com/aaronarduino/goqrsvg v0.0.0-20170617203649-603647895681 h1:eZrVcUgy0P6+B6Vu7SKPh3UZQS5nEuyjhbkFyfz7I2I=
github.com/aaronarduino/goqrsvg v0.0.0-20170617203649-603647895681/go.mod h1:dytw+5qs+pdi61fO/S4OmXR7AuEq/HvNCuG03KxQHT4=
github.com/ajstarks/svgo v0.0.0-20200320125537-f189e35d30ca h1:kWzLcty5V2rzOqJM7Tp/MfSX0RMSI1x4IOLApEefYxA=
github.com/ajstarks/svgo v0.0.0-20200320125537-f189e35d30ca/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
github.com/boombuler/barcode v1.0.0 h1:s1TvRnXwL2xJRaccrdcBQMZxq6X7DvsMogtmJeHDdrc=
github.com/boombuler/barcode v1.0.0/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e h1:MRM5ITcdelLK2j1vwZ3Je0FKVCfqOLp5zO6trqMLYs0=
github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e/go.mod h1:XV66xRDqSt+GTGFMVlhk3ULuV0y9ZmzeVGR4mloJI3M=

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// Package qrbill implements the Swiss QR-bill standard.
//
// More specifically, the most recent standard version at the time of writing
// was the Swiss Payment Standards 2019 Swiss Implementation Guidelines QR-bill
// Version 2.1, to be found at:
//
// https://www.paymentstandards.ch/dam/downloads/ig-qr-bill-en.pdf (English)
// https://www.paymentstandards.ch/dam/downloads/ig-qr-bill-de.pdf (German)
package qrbill
import (
"image"
"log"
"os"
"strings"
"github.com/aaronarduino/goqrsvg"
svg "github.com/ajstarks/svgo"
"github.com/boombuler/barcode"
"github.com/boombuler/barcode/qr"
// We currently read the swiss cross PNG version.
_ "image/png"
)
// As per section 4.1: In general:
// Oriented upon the Swiss Implementation Guidelines for Credit Transfers for
// the ISO 20022 Customer Credit Transfer Initiation message (pain.001).
// Section 4.2.1: Character set:
// UTF-8 should be used for encoding
// see also:
// https://github.com/codebude/QRCoder/wiki/Advanced-usage---Payload-generators#317-swissqrcode-iso-20022
const (
// QRType is an unambiguous indicator for the Swiss QR Code. Fixed value
// "SPC".
QRType = "SPC" // Swiss Payments Code
// Version contains the version of the specifications (Implementation
// Guidelines) in use on the date on which the Swiss QR Code was
// created. The first two positions indicate the main version, the following
// two positions the sub-version. Fixed value of "0200" for Version 2.0.
Version = "0200" // Version 2.0
// CodingType is the character set code. Fixed value "1".
CodingType = "1" // UTF-8 restricted to the Latin character set
)
// AddressType corresponds to AdrTp in ISO20022.
type AddressType string
const (
AddressTypeStructured AddressType = "S"
AddressTypeCombined = "K"
)
// - fixed length: 21 alphanumeric characters
// - only IBANs with CH or LI country code permitted
var iban = "CH0209000000870913543"
type Address struct {
AdrTp AddressType
Name string // Name, max 70. chars, first name + last name, or company name
StrtNmOrAdrLine1 string // Street or address line 1
BldgNbOrAdrLine2 string // Building number or address line 2
PstCd string // Postal code, max 16 chars, must be provided without a country code prefix
TwnNm string // Town, max. 35 chars
Ctry string // Country, two-digit country code according to ISO 3166-1
}
type QRCHHeader struct {
QRType string
Version string
Coding string
}
type QRCHCdtrInf struct {
IBAN string
Cdtr Address // Creditor
}
type QRCHCcyAmt struct {
Amt string // Amount
Ccy string // Currency
}
type QRCHRmtInfAddInf struct {
Ustrd string // Unstructured message
Trailer string // Trailer
}
type QRCHRmtInf struct {
Tp string // Reference type
Ref string // Reference
AddInf QRCHRmtInfAddInf // Additional information
}
type QRCH struct {
Header QRCHHeader // Header
CdtrInf QRCHCdtrInf // Creditor information (Account / Payable to)
UltmtCdtr Address // (must not be filled in, for Future Use)
CcyAmt QRCHCcyAmt // Paymount amount information
UltmtDbtr Address // Ultimate Debtor
RmtInf QRCHRmtInf // Payment reference
}
func (q *QRCH) QRContents() string {
return strings.Join([]string{
q.Header.QRType,
q.Header.Version,
q.Header.Coding,
q.CdtrInf.IBAN,
string(q.CdtrInf.Cdtr.AdrTp),
q.CdtrInf.Cdtr.Name,
q.CdtrInf.Cdtr.StrtNmOrAdrLine1,
q.CdtrInf.Cdtr.BldgNbOrAdrLine2,
q.CdtrInf.Cdtr.PstCd,
q.CdtrInf.Cdtr.TwnNm,
q.CdtrInf.Cdtr.Ctry,
string(q.UltmtCdtr.AdrTp),
q.UltmtCdtr.Name,
q.UltmtCdtr.StrtNmOrAdrLine1,
q.UltmtCdtr.BldgNbOrAdrLine2,
q.UltmtCdtr.PstCd,
q.UltmtCdtr.TwnNm,
q.UltmtCdtr.Ctry,
q.CcyAmt.Amt,
q.CcyAmt.Ccy,
string(q.UltmtDbtr.AdrTp),
q.UltmtDbtr.Name,
q.UltmtDbtr.StrtNmOrAdrLine1,
q.UltmtDbtr.BldgNbOrAdrLine2,
q.UltmtDbtr.PstCd,
q.UltmtDbtr.TwnNm,
q.UltmtDbtr.Ctry,
q.RmtInf.Tp,
q.RmtInf.Ref,
q.RmtInf.AddInf.Ustrd,
q.RmtInf.AddInf.Trailer,
}, "\n")
}
// https://www.paymentstandards.ch/dam/downloads/qrcodegenerator.java
func generateSwissQrCode(content string) error {
// generate the qr code from the payload
code, err := qr.Encode(content, qr.M, qr.Auto)
if err != nil {
return err
}
// overlay the qr code with a Swiss Cross
combined, err := overlayWithSwissCross(code)
if err != nil {
return err
}
_ = combined
return nil
}
func overlayWithSwissCross(code barcode.Barcode) (image.Image, error) {
// TODO: bundle a swiss cross image
const swissCrossPath = "/home/michael/go/src/github.com/stapelberg/qrbill/third_party/swiss-cross/CH-Kreuz_7mm/CH-Kreuz_7mm.png"
// TODO: read swiss cross image
f, err := os.Open(swissCrossPath)
if err != nil {
return nil, err
}
defer f.Close()
m, _, err := image.Decode(f)
if err != nil {
return nil, err
}
log.Printf("bounds: %+v", m.Bounds())
return nil, nil
}
func Generate() error {
log.Printf("hey!")
content := (&QRCH{
Header: QRCHHeader{
QRType: QRType,
Version: Version,
Coding: CodingType,
},
CdtrInf: QRCHCdtrInf{
IBAN: iban,
Cdtr: Address{
AdrTp: AddressTypeStructured, // CR AddressTyp
Name: "Legalize it!", // CR Name
StrtNmOrAdrLine1: "Quellenstrasse 25", // CR Street or address line 1
BldgNbOrAdrLine2: "", // CR Building number or address line 2
PstCd: "8005", // CR Postal code
TwnNm: "Zürich", // CR City
Ctry: "CH", // CR Country
},
},
CcyAmt: QRCHCcyAmt{
Amt: "",
Ccy: "CHF",
},
UltmtDbtr: Address{
"S", // UD AddressTyp
"Michael Stapelberg", // UD Name
"Brahmsstrasse 21", // UD Street or address line 1
"", // UD Building number or address line 2
"8003", // Postal code
"Zürich", // City
"CH", // Country
},
RmtInf: QRCHRmtInf{
Tp: "NON", // Reference type
Ref: "", // Reference
AddInf: QRCHRmtInfAddInf{
Ustrd: "Spende 6141",
Trailer: "EPD",
},
},
}).QRContents()
// as per https://www.paymentstandards.ch/dam/downloads/ig-qr-bill-en.pdf, section 5.1:
// Error correction level M (redundancy of around 15%)
// TODO: data content must be no more than 997 characters
// https://www.PaymentStandards.CH/FAQ)
// TODO: auf version 24 (46mm x 46mm) skalieren
// version 25 with 117 x 117 modules
// minimum module size of 0.4mm (recommended for printing)
// TODO: overlay the swiss cross logo!
// TODO: verify dimensions when printed
// TODO: ensure UTF-8
code, err := qr.Encode(content, qr.M, qr.Auto)
if err != nil {
return err
}
f, err := os.Create("/tmp/code.svg")
if err != nil {
return err
}
defer f.Close()
s := svg.New(f)
qrsvg := goqrsvg.NewQrSVG(code, 5)
qrsvg.StartQrSVG(s)
if err := qrsvg.WriteQrSVG(s); err != nil {
return err
}
s.End()
if err := f.Close(); err != nil {
return err
}
if err := generateSwissQrCode(content); err != nil {
return err
}
/*
code, err := qrcode.NewWithForcedVersion(content, 25, qrcode.Medium)
if err != nil {
return err
}
log.Printf("code: %v", code)
const pixelsPerMillimeter = 10
return code.WriteFile(-2, "/tmp/code.png")
*/
return nil
}

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<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 20.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<svg version="1.1" id="Ebene_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
viewBox="0 0 19.8 19.8" style="enable-background:new 0 0 19.8 19.8;" xml:space="preserve">
<style type="text/css">
.st0{fill:#FFFFFF;}
.st1{fill:none;stroke:#FFFFFF;stroke-width:1.4357;stroke-miterlimit:10;}
</style>
<polygon points="18.3,0.7 1.6,0.7 0.7,0.7 0.7,1.6 0.7,18.3 0.7,19.1 1.6,19.1 18.3,19.1 19.1,19.1 19.1,18.3 19.1,1.6 19.1,0.7 "/>
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</svg>
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