🚚 ➕ add node-signpdf copy to signing packgage until npm includes fix

packages/signing/node-signpdf/dist/helpers/pdfkitAddPlaceholder.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _const = require("./const");
+
+var _pdfkitReferenceMock = _interopRequireDefault(require("./pdfkitReferenceMock"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+// eslint-disable-next-line import/no-unresolved
+
+/**
+ * Adds the objects that are needed for Adobe.PPKLite to read the signature.
+ * Also includes a placeholder for the actual signature.
+ * Returns an Object with all the added PDFReferences.
+ * @param {PDFDocument} pdf
+ * @param {string} reason
+ * @returns {object}
+ */
+const pdfkitAddPlaceholder = ({
+  pdf,
+  pdfBuffer,
+  reason,
+  contactInfo = 'emailfromp1289@gmail.com',
+  name = 'Name from p12',
+  location = 'Location from p12',
+  signatureLength = _const.DEFAULT_SIGNATURE_LENGTH,
+  byteRangePlaceholder = _const.DEFAULT_BYTE_RANGE_PLACEHOLDER,
+  subFilter = _const.SUBFILTER_ADOBE_PKCS7_DETACHED
+}) => {
+  /* eslint-disable no-underscore-dangle,no-param-reassign */
+  // Generate the signature placeholder
+  const signature = pdf.ref({
+    Type: 'Sig',
+    Filter: 'Adobe.PPKLite',
+    SubFilter: subFilter,
+    ByteRange: [0, byteRangePlaceholder, byteRangePlaceholder, byteRangePlaceholder],
+    Contents: Buffer.from(String.fromCharCode(0).repeat(signatureLength)),
+    Reason: new String(reason),
+    // eslint-disable-line no-new-wrappers
+    M: new Date(),
+    ContactInfo: new String(contactInfo),
+    // eslint-disable-line no-new-wrappers
+    Name: new String(name),
+    // eslint-disable-line no-new-wrappers
+    Location: new String(location) // eslint-disable-line no-new-wrappers
+
+  }); // Check if pdf already contains acroform field
+
+  const acroFormPosition = pdfBuffer.lastIndexOf('/Type /AcroForm');
+  const isAcroFormExists = acroFormPosition !== -1;
+  let fieldIds = [];
+  let acroFormId;
+
+  if (isAcroFormExists) {
+    let acroFormStart = acroFormPosition; // 10 is the distance between "/Type /AcroForm" and AcroFrom ID
+
+    const charsUntilIdEnd = 10;
+    const acroFormIdEnd = acroFormPosition - charsUntilIdEnd; // Let's find AcroForm ID by trying to find the "\n" before the ID
+    // 12 is a enough space to find the "\n"
+    // (generally it's 2 or 3, but I'm giving a big space though)
+
+    const maxAcroFormIdLength = 12;
+    let foundAcroFormId = '';
+    let index = charsUntilIdEnd + 1;
+
+    for (index; index < charsUntilIdEnd + maxAcroFormIdLength; index += 1) {
+      const acroFormIdString = pdfBuffer.slice(acroFormPosition - index, acroFormIdEnd).toString();
+
+      if (acroFormIdString[0] === '\n') {
+        break;
+      }
+
+      foundAcroFormId = acroFormIdString;
+      acroFormStart = acroFormPosition - index;
+    }
+
+    const pdfSlice = pdfBuffer.slice(acroFormStart);
+    const acroForm = pdfSlice.slice(0, pdfSlice.indexOf('endobj')).toString();
+    acroFormId = parseInt(foundAcroFormId);
+    const acroFormFields = acroForm.slice(acroForm.indexOf('/Fields [') + 9, acroForm.indexOf(']'));
+    fieldIds = acroFormFields.split(' ').filter((element, i) => i % 3 === 0).map(fieldId => new _pdfkitReferenceMock.default(fieldId));
+  }
+
+  const signatureName = 'Signature'; // Generate signature annotation widget
+
+  const widget = pdf.ref({
+    Type: 'Annot',
+    Subtype: 'Widget',
+    FT: 'Sig',
+    Rect: [0, 0, 0, 0],
+    V: signature,
+    T: new String(signatureName + (fieldIds.length + 1)),
+    // eslint-disable-line no-new-wrappers
+    F: 4,
+    P: pdf.page.dictionary // eslint-disable-line no-underscore-dangle
+
+  });
+  pdf.page.dictionary.data.Annots = [widget]; // Include the widget in a page
+
+  let form;
+
+  if (!isAcroFormExists) {
+    // Create a form (with the widget) and link in the _root
+    form = pdf.ref({
+      Type: 'AcroForm',
+      SigFlags: 3,
+      Fields: [...fieldIds, widget]
+    });
+  } else {
+    // Use existing acroform and extend the fields with newly created widgets
+    form = pdf.ref({
+      Type: 'AcroForm',
+      SigFlags: 3,
+      Fields: [...fieldIds, widget]
+    }, acroFormId);
+  }
+
+  pdf._root.data.AcroForm = form;
+  return {
+    signature,
+    form,
+    widget
+  };
+  /* eslint-enable no-underscore-dangle,no-param-reassign */
+};
+
+var _default = pdfkitAddPlaceholder;
+exports.default = _default;