📦 [placeholder-pdf-lib]

packages/placeholder-pdf-lib/dist/pdflibAddPlaceholder.d.ts

@@ -1,16 +1,20 @@
 export function pdflibAddPlaceholder({ pdfDoc, reason, contactInfo, name, location, signatureLength, byteRangePlaceholder, subFilter, widgetRect, }: InputType): void;
-export type PDFDocumentFactory = import('pdf-lib').PDFDocumentFactory;
+export type PDFDocument = import('pdf-lib').PDFDocument;
 export type InputType = {
-    pdfDoc: any;
+    pdfDoc: PDFDocument;
     reason: string;
     contactInfo: string;
     name: string;
     location: string;
     signatureLength?: number;
     byteRangePlaceholder?: string;
     /**
-     * One of SUBFILTER_* from
+     * One of SUBFILTER_* from \@signpdf/utils
      */
     subFilter?: string;
+    /**
+     * [x1, y1, x2, y2] widget rectangle
+     */
+    widgetRect?: number[];
 };
 //# sourceMappingURL=pdflibAddPlaceholder.d.ts.map

packages/placeholder-pdf-lib/dist/pdflibAddPlaceholder.js

@@ -7,19 +7,19 @@ exports.pdflibAddPlaceholder = void 0;
 var _utils = require("@signpdf/utils");
 var _pdfLib = require("pdf-lib");
 /**
- * @typedef {import('pdf-lib').PDFDocumentFactory} PDFDocumentFactory
+ * @typedef {import('pdf-lib').PDFDocument} PDFDocument
  */
 
 /**
 * @typedef {object} InputType
-* @property {PDFDocumentFactory} pdfDoc
+* @property {PDFDocument} pdfDoc
 * @property {string} reason
 * @property {string} contactInfo
 * @property {string} name
 * @property {string} location
 * @property {number} [signatureLength]
 * @property {string} [byteRangePlaceholder]
-* @property {string} [subFilter] One of SUBFILTER_* from @signpdf/utils
+* @property {string} [subFilter] One of SUBFILTER_* from \@signpdf/utils
 * @property {number[]} [widgetRect] [x1, y1, x2, y2] widget rectangle
 */
 
@@ -42,7 +42,7 @@ const pdflibAddPlaceholder = ({
   subFilter = _utils.SUBFILTER_ADOBE_PKCS7_DETACHED,
   widgetRect = [0, 0, 0, 0]
 }) => {
-  const pages = pdfDoc.getPages();
+  const page = pdfDoc.getPage(0);
 
   // Create a placeholder where the the last 3 parameters of the
   // actual range will be replaced when signing is done.
@@ -53,8 +53,7 @@ const pdflibAddPlaceholder = ({
   byteRange.push(_pdfLib.PDFName.of(byteRangePlaceholder));
 
   // Fill the contents of the placeholder with 00s.
-  const hexNull = (0, _pdfLib.toHexStringOfMinLength)(0, 4);
-  const placeholder = _pdfLib.PDFHexString.of(hexNull.repeat(signatureLength));
+  const placeholder = _pdfLib.PDFHexString.of(String.fromCharCode(0).repeat(signatureLength));
 
   // Create a signature dictionary to be referenced in the signature widget.
   const signatureDict = pdfDoc.context.obj({
@@ -69,6 +68,7 @@ const pdflibAddPlaceholder = ({
     Name: _pdfLib.PDFString.of(name),
     Location: _pdfLib.PDFString.of(location)
   }, pdfDoc.index);
+  const signatureDictRef = pdfDoc.context.register(signatureDict);
 
   // Create the signature widget
   const rect = _pdfLib.PDFArray.withContext(pdfDoc.context);
@@ -78,20 +78,46 @@ const pdflibAddPlaceholder = ({
     Subtype: 'Widget',
     FT: 'Sig',
     Rect: rect,
-    V: signatureDict,
+    V: signatureDictRef,
     T: _pdfLib.PDFString.of('Signature1'),
-    F: 4,
-    P: pages[0].ref
+    F: _utils.ANNOTATION_FLAGS.PRINT,
+    P: page.ref
   }, pdfDoc.index);
   const widgetDictRef = pdfDoc.context.register(widgetDict);
 
-  // Annotate the widget
-  pages[0].node.set(_pdfLib.PDFName.of('Annots'), pdfDoc.context.obj([widgetDictRef]));
+  // Annotate the widget on the first page
+  let annotations = page.node.lookupMaybe(_pdfLib.PDFName.of('Annots'), _pdfLib.PDFArray);
+  if (typeof annotations === 'undefined') {
+    annotations = pdfDoc.context.obj([]);
+  }
+  annotations.push(widgetDictRef);
+  page.node.set(_pdfLib.PDFName.of('Annots'), annotations);
 
-  // Reference the widget in the AcroForm
-  pdfDoc.catalog.set(_pdfLib.PDFName.of('AcroForm'), pdfDoc.context.obj({
-    SigFlags: 3,
-    Fields: [widgetDictRef]
-  }));
+  // Add an AcroForm or update the existing one
+  let acroForm = pdfDoc.catalog.lookupMaybe(_pdfLib.PDFName.of('AcroForm'), _pdfLib.PDFDict);
+  if (typeof acroForm === 'undefined') {
+    // Need to create a new AcroForm
+    acroForm = pdfDoc.context.obj({
+      Fields: []
+    });
+    const acroFormRef = pdfDoc.context.register(acroForm);
+    pdfDoc.catalog.set(_pdfLib.PDFName.of('AcroForm'), acroFormRef);
+  }
+
+  /**
+   * @type {PDFNumber}
+   */
+  let sigFlags;
+  if (acroForm.has(_pdfLib.PDFName.of('SigFlags'))) {
+    // Already has some flags, will merge
+    sigFlags = acroForm.get(_pdfLib.PDFName.of('SigFlags'));
+  } else {
+    // Create blank flags
+    sigFlags = _pdfLib.PDFNumber.of(0);
+  }
+  const updatedFlags = _pdfLib.PDFNumber.of(sigFlags.asNumber() | _utils.SIG_FLAGS.SIGNATURES_EXIST | _utils.SIG_FLAGS.APPEND_ONLY);
+  acroForm.set(_pdfLib.PDFName.of('SigFlags'), updatedFlags);
+  const fields = acroForm.get(_pdfLib.PDFName.of('Fields'));
+  fields.push(widgetDictRef);
 };
 exports.pdflibAddPlaceholder = pdflibAddPlaceholder;