scale down the qrcode and insert link

dist/pdfParser.d.ts

@@ -6,5 +6,6 @@ declare class PDFparser {
     constructor(document: Buffer);
     getPDFMeta: () => Promise<IgetMetaResponse>;
     insertQrCode: (imgBytes: ArrayBuffer) => Promise<ArrayBuffer>;
+    private createPageLinkAnnotation;
 }
 export default PDFparser;

dist/pdfParser.js

@@ -13,6 +13,7 @@ var __importDefault = (this && this.__importDefault) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const verify_pdf_1 = __importDefault(require("@ninja-labs/verify-pdf"));
+const pdf_lib_1 = require("pdf-lib");
 const pdfdataextract_1 = require("pdfdataextract");
 const config_1 = require("./config");
 const { PDFDocument } = require("pdf-lib");
@@ -48,25 +49,35 @@ class PDFparser {
         this.insertQrCode = (imgBytes) => __awaiter(this, void 0, void 0, function* () {
             const pdfDoc = yield PDFDocument.load(this.document);
             const img = yield pdfDoc.embedPng(imgBytes);
-            // const imagePage = pdfDoc.insertPage(0);
+            const scaled = img.scale(0.5);
             const pages = pdfDoc.getPages();
             const firstPage = pages[0];
-            const { width, height } = firstPage.getSize();
             firstPage.drawImage(img, {
-                x: firstPage.getWidth() / 2 - img.width / 2,
-                y: firstPage.getHeight() / 2 - img.height / 2,
-                width: img.width,
-                height: img.height,
+                x: firstPage.getWidth() / 2 - scaled.width / 2,
+                y: firstPage.getHeight() / 2 - scaled.height / 2,
+                width: scaled.width,
+                height: scaled.height,
             });
-            // firstPage.drawImage(img, {
-            //   x: 0,
-            //   y: 0,
-            //   width: firstPage.getWidth(),
-            //   height: firstPage.getHeight(),
-            // });
+            const link = this.createPageLinkAnnotation(firstPage, "https://pdf-lib.js.org/", {
+                imgXPos: firstPage.getWidth() / 2 - scaled.width / 2,
+                imgYPos: firstPage.getHeight() / 2 - scaled.height / 2,
+                imgWidth: scaled.width,
+                imagHeight: scaled.height,
+            });
+            firstPage.node.set(pdf_lib_1.PDFName.of("Annots"), pdfDoc.context.obj([link]));
             const pdfBytes = yield pdfDoc.save();
             return pdfBytes;
         });
+        this.createPageLinkAnnotation = (page, uri, { imgXPos, imgYPos, imgWidth, imagHeight }) => page.doc.context.register(page.doc.context.obj({
+            Type: "Annot",
+            Subtype: "Link",
+            Rect: [imgXPos, imgYPos, imgXPos + imgWidth, imgYPos + imagHeight],
+            A: {
+                Type: "Action",
+                S: "URI",
+                URI: pdf_lib_1.PDFString.of(uri),
+            },
+        }));
         this.document = document;
         this.config = config_1.config;
     }

src/pdfParser.ts

 import verifyPDF from "@ninja-labs/verify-pdf";
+import { PDFName, PDFPage, PDFString } from "pdf-lib";
 import { PdfData } from "pdfdataextract";
 import { config } from "./config";
 import { IgetMetaResponse } from "./types";
 const { PDFDocument } = require("pdf-lib");
-
 class PDFparser {
   readonly document;
   readonly config;
@@ -44,31 +44,55 @@ class PDFparser {
   insertQrCode = async (imgBytes: ArrayBuffer): Promise<ArrayBuffer> => {
     const pdfDoc = await PDFDocument.load(this.document);
     const img = await pdfDoc.embedPng(imgBytes);
-    // const imagePage = pdfDoc.insertPage(0);
+
+    const scaled = img.scale(0.5);
 
     const pages = pdfDoc.getPages();
-    const firstPage = pages[0];
 
-    const { width, height } = firstPage.getSize();
+    const firstPage = pages[0];
 
     firstPage.drawImage(img, {
-      x: firstPage.getWidth() / 2 - img.width / 2,
-      y: firstPage.getHeight() / 2 - img.height / 2,
-      width: img.width,
-      height: img.height,
+      x: firstPage.getWidth() / 2 - scaled.width / 2,
+      y: firstPage.getHeight() / 2 - scaled.height / 2,
+      width: scaled.width,
+      height: scaled.height,
     });
 
-    // firstPage.drawImage(img, {
-    //   x: 0,
-    //   y: 0,
-    //   width: firstPage.getWidth(),
-    //   height: firstPage.getHeight(),
-    // });
+    const link = this.createPageLinkAnnotation(
+      firstPage,
+      "https://pdf-lib.js.org/",
+      {
+        imgXPos: firstPage.getWidth() / 2 - scaled.width / 2,
+        imgYPos: firstPage.getHeight() / 2 - scaled.height / 2,
+        imgWidth: scaled.width,
+        imagHeight: scaled.height,
+      }
+    );
+
+    firstPage.node.set(PDFName.of("Annots"), pdfDoc.context.obj([link]));
 
     const pdfBytes = await pdfDoc.save();
 
     return pdfBytes;
   };
+
+  private createPageLinkAnnotation = (
+    page: PDFPage,
+    uri: string,
+    { imgXPos, imgYPos, imgWidth, imagHeight }
+  ) =>
+    page.doc.context.register(
+      page.doc.context.obj({
+        Type: "Annot",
+        Subtype: "Link",
+        Rect: [imgXPos, imgYPos, imgXPos + imgWidth, imgYPos + imagHeight],
+        A: {
+          Type: "Action",
+          S: "URI",
+          URI: PDFString.of(uri),
+        },
+      })
+    );
 }
 
 export default PDFparser;