✨ [examples] placeholder-pdf-lib

packages/examples/src/pdf-lib.js

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+var fs = require('fs');
+var path = require('path');
+var PDFDocument = require('pdf-lib').PDFDocument;
+var pdflibAddPlaceholder = require('@signpdf/placeholder-pdf-lib').pdflibAddPlaceholder;
+var signpdf = require('@signpdf/signpdf').default;
+var P12Signer = require('@signpdf/signer-p12').P12Signer;
+
+function work() {
+    // contributing.pdf is the file that is going to be signed
+    var sourcePath = path.join(__dirname, '/../../../resources/contributing.pdf');
+    var pdfBuffer = fs.readFileSync(sourcePath);
+
+    // certificate.p12 is the certificate that is going to be used to sign
+    var certificatePath = path.join(__dirname, '/../../../resources/certificate.p12');
+    var certificateBuffer = fs.readFileSync(certificatePath);
+    var signer = new P12Signer(certificateBuffer);
+
+    // Load the document into PDF-LIB
+    PDFDocument.load(pdfBuffer).then(function (pdfDoc) {
+        // Add a placeholder for a signature.
+        pdflibAddPlaceholder({
+            pdfDoc: pdfDoc,
+            reason: 'The user is decalaring consent through JavaScript.',
+            contactInfo: 'signpdf@example.com',
+            name: 'John Doe',
+            location: 'Free Text Str., Free World',
+        });
+
+        // Convert the PDF-LIB PDFDocument to Buffer
+        pdfDoc.save({useObjectStreams: false}).then(function (pdfBytes) {
+            var pdfWithPlaceholder = Buffer.from(pdfBytes);
+
+            // And finally sign the document.
+            signpdf
+                .sign(pdfWithPlaceholder, signer)
+                .then(function (signedPdf) {
+                    // signedPdf is a Buffer of an electronically signed PDF. Store it.
+                    var targetPath = path.join(__dirname, '/../output/pdf-lib.pdf');
+                    fs.writeFileSync(targetPath, signedPdf);
+                })
+        })
+    })
+}
+
+work();