Generate QR Code with Poster as PDF

README.md

@@ -56,6 +56,14 @@ $ cwa-event-qr-code terminal \
   --type 1 \
   --default-check-in-length-in-minutes 30
 
+# Create poster
+$ cwa-event-qr-code poster \
+  --description hello-world \
+  --address hello \
+  --type 1 \
+  --default-check-in-length-in-minutes 30 \
+  --filepath hello-world.pdf
+
 # Alternatively, you can skip the global installation by using npx
 $ npx cwa-event-qr-code --help
 ```

THIRD-PARTY-NOTICES

@@ -10,6 +10,11 @@ corona-warn-app.opensource@sap.com
 
 Components:
 -----------
+Component: pdf-lib
+Licensor:  Andrew Dillon and other contributors
+Website:   https://github.com/Hopding/pdf-lib
+License:   MIT License
+
 Component: protobufjs
 Licensor:  Google Inc. and other contributors
 Website:   https://github.com/protobufjs/protobuf.js

bin/cli

@@ -5,5 +5,6 @@ const yargs = require('yargs')
 
 yargs
   .command(require('./../lib/yargs/commands/file')())
+  .command(require('./../lib/yargs/commands/poster')())
   .command(require('./../lib/yargs/commands/terminal')())
   .argv

lib/generate-poster.js

@@ -0,0 +1,56 @@
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const {
+  PDFDocument,
+  rgb,
+  StandardFonts
+} = require('pdf-lib')
+const { promisify } = require('util')
+
+const readFile = promisify(fs.readFile)
+
+module.exports = async ({ qrCode, locationData }) => {
+  const templateFilepath = path.resolve(__dirname, '../assets/pt-poster-1.0.0.pdf')
+  const template = await readFile(templateFilepath)
+
+  const pdfDoc = await PDFDocument.load(template)
+
+  const pngImage = await pdfDoc.embedPng(qrCode)
+  const pngDims = pngImage.scaleToFit(400, 400)
+  const page = pdfDoc.getPage(0)
+  page.drawImage(pngImage, {
+    x: page.getWidth() / 2 - pngDims.width / 2,
+    y: page.getHeight() / 2 - pngDims.height + 340,
+    width: pngDims.width,
+    height: pngDims.height
+  })
+
+  const fontSize = 10
+  const helveticaFont = await pdfDoc.embedFont(StandardFonts.Helvetica)
+  const maxTextWidth = 420
+  const truncateText = text => {
+    while (helveticaFont.widthOfTextAtSize(text, fontSize) > maxTextWidth) {
+      text = text.substr(0, text.length - 1)
+    }
+    return text
+  }
+
+  page.drawText(truncateText(locationData.description), {
+    x: 80,
+    y: 325,
+    size: fontSize,
+    font: helveticaFont,
+    color: rgb(0, 0, 0)
+  })
+  page.drawText(truncateText(locationData.address), {
+    x: 80,
+    y: 310,
+    size: fontSize,
+    font: helveticaFont,
+    color: rgb(0, 0, 0)
+  })
+
+  return pdfDoc.save()
+}

lib/index.js

@@ -1,13 +1,17 @@
 'use strict'
 
+const fs = require('fs')
 const QRCode = require('qrcode')
 const { promisify } = require('util')
 
 const generateQRCodePayload = require('./generate-qr-code-payload')
 const generateQRCodeUrl = require('./generate-qr-code-url')
+const generatePoster = require('./generate-poster')
 
 const qrCodeToFile = promisify(QRCode.toFile)
+const qrCodeToBuffer = promisify(QRCode.toBuffer)
 const qrCodeToString = promisify(QRCode.toString)
+const writeFile = promisify(fs.writeFile)
 
 const createEventQRCode = ({ locationData, vendorData }) => {
   const toQRCodePayloadBuffer = () => generateQRCodePayload({ locationData, vendorData })
@@ -20,6 +24,10 @@ const createEventQRCode = ({ locationData, vendorData }) => {
     const url = await toURL()
     return qrCodeToFile(filepath, url, options)
   }
+  const toBuffer = async (options) => {
+    const url = await toURL()
+    return qrCodeToBuffer(url, options)
+  }
   const toPNG = async (filepath, options) => {
     options.type = 'png'
     return toFile(filepath, options)
@@ -32,14 +40,20 @@ const createEventQRCode = ({ locationData, vendorData }) => {
     const url = await toURL()
     return qrCodeToString(url, { type: 'terminal' })
   }
+  const toPoster = async (filepath) => {
+    const qrCode = await toBuffer({ width: 1000, type: 'png' })
+    const pdf = await generatePoster({ qrCode, locationData })
+    await writeFile(filepath, pdf)
+  }
 
   return {
     toQRCodePayloadBuffer,
     toURL,
     toFile,
     toPNG,
     toSVG,
-    toString
+    toString,
+    toPoster
   }
 }
 

lib/yargs/commands/poster.js

@@ -0,0 +1,32 @@
+'use strict'
+
+const path = require('path')
+const { createEventQRCode } = require('../../index')
+const {
+  addOptionsForLocationData,
+  addOptionsForVendorData,
+  getLocationDataFromArgv,
+  getVendorDataFromArgv
+} = require('../yargs-util')
+
+module.exports = () => {
+  return {
+    command: ['poster'],
+    desc: 'create poster with QR code',
+    builder: yargs => {
+      addOptionsForLocationData(yargs)
+      addOptionsForVendorData(yargs)
+      yargs.option('filepath')
+    },
+    handler: async argv => {
+      const locationData = getLocationDataFromArgv(argv)
+      const vendorData = getVendorDataFromArgv(argv)
+      const eventQRCode = createEventQRCode({ locationData, vendorData })
+
+      const filepath = path.resolve(process.cwd(), argv.filepath)
+      await eventQRCode.toPoster(filepath)
+
+      console.log(`Created ${filepath}`)
+    }
+  }
+}

package.json

@@ -28,6 +28,7 @@
   },
   "homepage": "https://github.com/corona-warn-app/cwa-event-qr-code#readme",
   "dependencies": {
+    "pdf-lib": "1.16.0",
     "protobufjs": "6.10.2",
     "qrcode": "1.4.4",
     "yargs": "16.2.0"