initial commit

2026-09-08 10:47:39 +02:00 · 2023-10-22 01:37:25 +05:30
parent 80327652c3
commit 97fd28697a
182 changed files with 55033 additions and 122 deletions
@@ -0,0 +1,138 @@
+import PDFObject from "./pdfObject.js";
+import PDFKitReferenceMock from "./PDFKitReferenceMock.js";
+import removeTrailingNewLine from "./removeTrailingNewLine.js";
+import {
+  DEFAULT_SIGNATURE_LENGTH,
+  SUBFILTER_ADOBE_PKCS7_DETACHED,
+} from "./const.js";
+import pdfkitAddPlaceholder from "./pdfkitAddPlaceholder.js";
+
+import getIndexFromRef from "./getIndexFromRef.js";
+import readPdf from "./readPdf.js";
+import getPageRef from "./getPageRef.js";
+import createBufferRootWithAcroform from "./createBufferRootWithAcroform.js";
+import createBufferPageWithAnnotation from "./createBufferPageWithAnnotation.js";
+import createBufferTrailer from "./createBufferTrailer.js";
+
+const isContainBufferRootWithAcroform = (pdf) => {
+  const bufferRootWithAcroformRefRegex = /\/AcroForm\s+(\d+\s\d+\sR)/g;
+  const match = bufferRootWithAcroformRefRegex.exec(pdf.toString());
+
+  return match != null && match[1] != null && match[1] !== "";
+};
+
+// testing
+
+const getAssembledPdf = (pdf, index, input, stream) => {
+  let finalPdf = pdf;
+
+  finalPdf = Buffer.concat([
+    finalPdf,
+    Buffer.from("\n"),
+    Buffer.from(`${index} 0 obj\n`),
+    Buffer.from(PDFObject.convert(input)),
+  ]);
+
+  if (stream) {
+    finalPdf = Buffer.concat([
+      finalPdf,
+      Buffer.from("\nstream\n"),
+      Buffer.from(stream),
+      Buffer.from("\nendstream"),
+    ]);
+  }
+
+  finalPdf = Buffer.concat([finalPdf, Buffer.from("\nendobj\n")]);
+
+  return finalPdf;
+};
+
+//
+/**
+ * Adds a signature placeholder to a PDF Buffer.
+ *
+ * This contrasts with the default pdfkit-based implementation.
+ * Parsing is done using simple string operations.
+ * Adding is done with `Buffer.concat`.
+ * This allows node-signpdf to be used on any PDF and
+ * not only on a freshly created through PDFKit one.
+ */
+const plainAddPlaceholder = ({
+  pdfBuffer,
+  reason,
+  contactInfo = "emailfromp1289@gmail.com",
+  name = "Name from p12",
+  location = "Location from p12",
+  signatureLength = DEFAULT_SIGNATURE_LENGTH,
+  subFilter = SUBFILTER_ADOBE_PKCS7_DETACHED,
+  sign,
+}) => {
+  let pdf = removeTrailingNewLine(pdfBuffer);
+  const info = readPdf(pdf);
+  const pageRef = getPageRef(pdf, info, sign.Page);
+  const pageIndex = getIndexFromRef(info.xref, pageRef);
+  const addedReferences = new Map();
+
+  const pdfKitMock = {
+    ref: (input, additionalIndex, stream) => {
+      info.xref.maxIndex += 1;
+
+      const index =
+        additionalIndex != null ? additionalIndex : info.xref.maxIndex;
+
+      addedReferences.set(index, pdf.length + 1); // + 1 new line
+
+      pdf = getAssembledPdf(pdf, index, input, stream);
+
+      return new PDFKitReferenceMock(info.xref.maxIndex);
+    },
+    page: {
+      dictionary: new PDFKitReferenceMock(pageIndex, {
+        data: {
+          Annots: [],
+        },
+      }),
+    },
+    _root: {
+      data: {},
+    },
+  };
+
+  const { form, widget } = pdfkitAddPlaceholder({
+    pdf: pdfKitMock,
+    pdfBuffer,
+    reason,
+    contactInfo,
+    name,
+    location,
+    signatureLength,
+    subFilter,
+    sign,
+  });
+
+  if (!isContainBufferRootWithAcroform(pdf)) {
+    const rootIndex = getIndexFromRef(info.xref, info.rootRef);
+    addedReferences.set(rootIndex, pdf.length + 1);
+    pdf = Buffer.concat([
+      pdf,
+      Buffer.from("\n"),
+      createBufferRootWithAcroform(pdf, info, form),
+    ]);
+  }
+  addedReferences.set(pageIndex, pdf.length + 1);
+  pdf = Buffer.concat([
+    pdf,
+    Buffer.from("\n"),
+    createBufferPageWithAnnotation(pdf, info, pageRef, widget),
+  ]);
+
+  pdf = Buffer.concat([
+    pdf,
+    Buffer.from("\n"),
+    createBufferTrailer(pdf, info, addedReferences),
+  ]);
+
+  return pdf;
+};
+
+export default plainAddPlaceholder;