implement web handler for QR code generation
This commit is contained in:
Michael Stapelberg
235
qrbill.go
235
qrbill.go
@@ -9,14 +9,12 @@
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package qrbill
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import (
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"bytes"
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"image"
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"log"
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"os"
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"strings"
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"github.com/aaronarduino/goqrsvg"
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svg "github.com/ajstarks/svgo"
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"github.com/boombuler/barcode"
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"github.com/boombuler/barcode/qr"
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// We currently read the swiss cross PNG version.
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@@ -34,17 +32,16 @@ import (
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// https://github.com/codebude/QRCoder/wiki/Advanced-usage---Payload-generators#317-swissqrcode-iso-20022
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const (
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// QRType is an unambiguous indicator for the Swiss QR Code. Fixed value
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// "SPC".
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// QRType is an unambiguous indicator for the Swiss QR Code. Fixed value.
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QRType = "SPC" // Swiss Payments Code
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// Version contains the version of the specifications (Implementation
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// Guidelines) in use on the date on which the Swiss QR Code was
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// created. The first two positions indicate the main version, the following
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// two positions the sub-version. Fixed value of "0200" for Version 2.0.
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// two positions the sub-version. Fixed value.
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Version = "0200" // Version 2.0
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// CodingType is the character set code. Fixed value "1".
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// CodingType is the character set code. Fixed value.
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CodingType = "1" // UTF-8 restricted to the Latin character set
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)
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@@ -58,7 +55,6 @@ const (
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// - fixed length: 21 alphanumeric characters
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// - only IBANs with CH or LI country code permitted
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var iban = "CH0209000000870913543"
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type Address struct {
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AdrTp AddressType
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@@ -106,176 +102,93 @@ type QRCH struct {
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RmtInf QRCHRmtInf // Payment reference
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}
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func (q *QRCH) QRContents() string {
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return strings.Join([]string{
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q.Header.QRType,
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q.Header.Version,
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q.Header.Coding,
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q.CdtrInf.IBAN,
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string(q.CdtrInf.Cdtr.AdrTp),
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q.CdtrInf.Cdtr.Name,
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q.CdtrInf.Cdtr.StrtNmOrAdrLine1,
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q.CdtrInf.Cdtr.BldgNbOrAdrLine2,
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q.CdtrInf.Cdtr.PstCd,
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q.CdtrInf.Cdtr.TwnNm,
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q.CdtrInf.Cdtr.Ctry,
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string(q.UltmtCdtr.AdrTp),
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q.UltmtCdtr.Name,
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q.UltmtCdtr.StrtNmOrAdrLine1,
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q.UltmtCdtr.BldgNbOrAdrLine2,
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q.UltmtCdtr.PstCd,
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q.UltmtCdtr.TwnNm,
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q.UltmtCdtr.Ctry,
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q.CcyAmt.Amt,
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q.CcyAmt.Ccy,
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string(q.UltmtDbtr.AdrTp),
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q.UltmtDbtr.Name,
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q.UltmtDbtr.StrtNmOrAdrLine1,
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q.UltmtDbtr.BldgNbOrAdrLine2,
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q.UltmtDbtr.PstCd,
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q.UltmtDbtr.TwnNm,
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q.UltmtDbtr.Ctry,
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q.RmtInf.Tp,
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q.RmtInf.Ref,
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q.RmtInf.AddInf.Ustrd,
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q.RmtInf.AddInf.Trailer,
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}, "\n")
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func (q *QRCH) Fill() *QRCH {
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clone := &QRCH{}
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*clone = *q
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clone.Header.QRType = QRType
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clone.Header.Version = Version
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clone.Header.Coding = CodingType
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clone.RmtInf.AddInf.Trailer = "EPD" // TODO: constant
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return clone
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}
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// https://www.paymentstandards.ch/dam/downloads/qrcodegenerator.java
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func generateSwissQrCode(content string) error {
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// generate the qr code from the payload
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code, err := qr.Encode(content, qr.M, qr.Auto)
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if err != nil {
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return err
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}
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func (q *QRCH) Encode() (*Bill, error) {
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f := q.Fill()
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//f := q.Fill()
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// TODO: data content must be no more than 997 characters
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// TODO: truncate fields where necessary
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return &Bill{
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qrcontents: strings.Join([]string{
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f.Header.QRType,
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f.Header.Version,
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f.Header.Coding,
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// overlay the qr code with a Swiss Cross
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combined, err := overlayWithSwissCross(code)
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if err != nil {
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return err
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}
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_ = combined
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f.CdtrInf.IBAN,
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return nil
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string(f.CdtrInf.Cdtr.AdrTp),
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f.CdtrInf.Cdtr.Name,
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f.CdtrInf.Cdtr.StrtNmOrAdrLine1,
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f.CdtrInf.Cdtr.BldgNbOrAdrLine2,
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f.CdtrInf.Cdtr.PstCd,
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f.CdtrInf.Cdtr.TwnNm,
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f.CdtrInf.Cdtr.Ctry,
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string(f.UltmtCdtr.AdrTp),
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f.UltmtCdtr.Name,
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f.UltmtCdtr.StrtNmOrAdrLine1,
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f.UltmtCdtr.BldgNbOrAdrLine2,
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f.UltmtCdtr.PstCd,
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f.UltmtCdtr.TwnNm,
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f.UltmtCdtr.Ctry,
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f.CcyAmt.Amt,
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f.CcyAmt.Ccy,
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string(f.UltmtDbtr.AdrTp),
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f.UltmtDbtr.Name,
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f.UltmtDbtr.StrtNmOrAdrLine1,
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f.UltmtDbtr.BldgNbOrAdrLine2,
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f.UltmtDbtr.PstCd,
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f.UltmtDbtr.TwnNm,
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f.UltmtDbtr.Ctry,
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f.RmtInf.Tp,
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f.RmtInf.Ref,
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f.RmtInf.AddInf.Ustrd,
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"EPD", // TODO: constant
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}, "\n"),
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}, nil
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}
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func overlayWithSwissCross(code barcode.Barcode) (image.Image, error) {
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// TODO: bundle a swiss cross image
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const swissCrossPath = "/home/michael/go/src/github.com/stapelberg/qrbill/third_party/swiss-cross/CH-Kreuz_7mm/CH-Kreuz_7mm.png"
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// TODO: read swiss cross image
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f, err := os.Open(swissCrossPath)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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m, _, err := image.Decode(f)
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if err != nil {
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return nil, err
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}
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log.Printf("bounds: %+v", m.Bounds())
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return nil, nil
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type Bill struct {
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qrcontents string
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}
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func Generate() error {
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log.Printf("hey!")
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content := (&QRCH{
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Header: QRCHHeader{
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QRType: QRType,
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Version: Version,
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Coding: CodingType,
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},
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CdtrInf: QRCHCdtrInf{
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IBAN: iban,
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Cdtr: Address{
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AdrTp: AddressTypeStructured, // CR AddressTyp
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Name: "Legalize it!", // CR Name
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StrtNmOrAdrLine1: "Quellenstrasse 25", // CR Street or address line 1
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BldgNbOrAdrLine2: "", // CR Building number or address line 2
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PstCd: "8005", // CR Postal code
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TwnNm: "Zürich", // CR City
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Ctry: "CH", // CR Country
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},
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},
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CcyAmt: QRCHCcyAmt{
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Amt: "",
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Ccy: "CHF",
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},
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UltmtDbtr: Address{
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"S", // UD AddressTyp
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"Michael Stapelberg", // UD Name
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"Brahmsstrasse 21", // UD Street or address line 1
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"", // UD Building number or address line 2
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"8003", // Postal code
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"Zürich", // City
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"CH", // Country
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},
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RmtInf: QRCHRmtInf{
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Tp: "NON", // Reference type
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Ref: "", // Reference
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AddInf: QRCHRmtInfAddInf{
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Ustrd: "Spende 6141",
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Trailer: "EPD",
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},
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},
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}).QRContents()
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func (b *Bill) EncodeToSVG() ([]byte, error) {
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// as per https://www.paymentstandards.ch/dam/downloads/ig-qr-bill-en.pdf, section 5.1:
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// Error correction level M (redundancy of around 15%)
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// TODO: data content must be no more than 997 characters
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// Section 4.2.1: Character set:
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// UTF-8 should be used for encoding
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// https://www.PaymentStandards.CH/FAQ)
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// TODO: auf version 24 (46mm x 46mm) skalieren
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// version 25 with 117 x 117 modules
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// minimum module size of 0.4mm (recommended for printing)
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// TODO: overlay the swiss cross logo!
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// TODO: verify dimensions when printed
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// TODO: ensure UTF-8
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code, err := qr.Encode(content, qr.M, qr.Auto)
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code, err := qr.Encode(b.qrcontents, qr.M, qr.Unicode)
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if err != nil {
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return err
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return nil, err
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}
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f, err := os.Create("/tmp/code.svg")
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if err != nil {
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return err
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}
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defer f.Close()
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s := svg.New(f)
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var buf bytes.Buffer
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s := svg.New(&buf)
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qrsvg := goqrsvg.NewQrSVG(code, 5)
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qrsvg.StartQrSVG(s)
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if err := qrsvg.WriteQrSVG(s); err != nil {
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return err
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return nil, err
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}
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// TODO: overlay the swiss cross logo!
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s.End()
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if err := f.Close(); err != nil {
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return err
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}
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if err := generateSwissQrCode(content); err != nil {
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return err
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}
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/*
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code, err := qrcode.NewWithForcedVersion(content, 25, qrcode.Medium)
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if err != nil {
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return err
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}
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log.Printf("code: %v", code)
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const pixelsPerMillimeter = 10
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return code.WriteFile(-2, "/tmp/code.png")
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*/
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return nil
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return buf.Bytes(), nil
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}
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func (b *Bill) EncodeToImage() (image.Image, error) {
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return generateSwissQrCode(b.qrcontents)
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}
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