Add payment QR code to invoice PDFs

backend/src/utils/pdf.ts

@@ -5,6 +5,7 @@ import {FastifyInstance} from "fastify";
 import { GetObjectCommand } from "@aws-sdk/client-s3";
 import { s3 } from "./s3";
 import { secrets } from "./secrets";
+import bwipjs from "bwip-js"
 
 const getCoordinatesForPDFLib = (x:number ,y:number, page:any) => {
     /*
@@ -29,6 +30,61 @@ const getRightAlignedX = (rightEdgeMm: number, text: string, size: number, font:
     return getCoordinatesForPDFLib(rightEdgeMm, 0, page).x - font.widthOfTextAtSize(text, size)
 }
 
+const normalizePaymentQrText = (value: any, maxLength: number) => {
+    return String(value || "")
+        .replace(/\r?\n/g, " ")
+        .replace(/[^\x20-\x7EÄÖÜäöüß]/g, "")
+        .trim()
+        .slice(0, maxLength)
+}
+
+const normalizeIban = (value: any) => String(value || "").replace(/\s+/g, "").toUpperCase()
+
+const getPaymentQrAmount = (value: any) => {
+    if (typeof value === "number" && Number.isFinite(value)) return value
+
+    const normalized = String(value || "")
+        .replace(/[^\d,.-]/g, "")
+        .replace(/\./g, "")
+        .replace(",", ".")
+
+    const amount = Number(normalized)
+
+    return Number.isFinite(amount) ? amount : 0
+}
+
+const getPaymentQrCodeBuffer = async (invoiceData: any) => {
+    if (invoiceData?.payment_type && invoiceData.payment_type !== "transfer") return null
+
+    const paymentQr = invoiceData?.paymentQr || {}
+    const iban = normalizeIban(paymentQr.iban)
+    const recipientName = normalizePaymentQrText(paymentQr.recipientName || paymentQr.name, 70)
+    const amount = getPaymentQrAmount(paymentQr.amount ?? invoiceData?.total?.totalSumToPay)
+
+    if (!iban || !recipientName || amount <= 0) return null
+
+    const epcPayload = [
+        "BCD",
+        "002",
+        "1",
+        "SCT",
+        normalizePaymentQrText(paymentQr.bic, 11),
+        recipientName,
+        iban,
+        `EUR${amount.toFixed(2)}`,
+        "",
+        normalizePaymentQrText(paymentQr.remittance || invoiceData?.documentNumber || invoiceData?.title, 140),
+        "",
+    ].join("\n")
+
+    return bwipjs.toBuffer({
+        bcid: "qrcode",
+        text: epcPayload,
+        scale: 4,
+        includetext: false,
+    })
+}
+
 
 const getBackgroundSourceBuffer = async (server:FastifyInstance, path:string) => {
 
@@ -70,6 +126,8 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
 
         const font = await pdfDoc.embedFont(StandardFonts.Helvetica)
         const fontBold = await pdfDoc.embedFont(StandardFonts.HelveticaBold)
+        const paymentQrCodeBuffer = await getPaymentQrCodeBuffer(invoiceData)
+        const paymentQrCode = paymentQrCodeBuffer ? await pdfDoc.embedPng(paymentQrCodeBuffer) : null
 
         let pages = []
         let pageCounter = 1
@@ -923,8 +981,31 @@ export const createInvoicePDF = async (server:FastifyInstance, returnMode, invoi
                 color: rgb(0, 0, 0),
                 lineHeight: 10,
                 opacity: 1,
-                maxWidth: 500
+                maxWidth: paymentQrCode ? 360 : 500
             })
+
+            if (paymentQrCode) {
+                const qrSize = 32 * 2.83
+                const qrPosition = getCoordinatesForPDFLib(166, rowHeight + endTextDiff + (invoiceData.totalArray.length - 3) * 8 - 1, page1)
+
+                pages[pageCounter - 1].drawText("Überweisung per QR-Code", {
+                    y: qrPosition.y + qrSize + 7,
+                    x: getCoordinatesForPDFLib(166, 0, page1).x,
+                    size: 8,
+                    color: rgb(0, 0, 0),
+                    lineHeight: 8,
+                    opacity: 1,
+                    maxWidth: 120,
+                    font: fontBold,
+                })
+
+                pages[pageCounter - 1].drawImage(paymentQrCode, {
+                    x: qrPosition.x,
+                    y: qrPosition.y,
+                    width: qrSize,
+                    height: qrSize,
+                })
+            }
         }
 
         return await pdfDoc.saveAsBase64()