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fix: rewrite form flattening handler

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Previously we used the form flattening method from PDF-Lib
but unfortunately when it encountered orphaned form items
or other PDF oddities it would throw an error.

Because of this certain documents would fail to seal and
be stuck in a pending state with no recourse available.
This change rewrites the form flattening handler to be
more lenient when coming across the unknown opting to skip
items it can't handle rather than abort.
This commit is contained in:
Mythie
2024-05-22 21:58:30 +10:00
parent 2f86bb523b
commit 4c0b772fc9
5 changed files with 132 additions and 6 deletions
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6
packages/lib/server-only/document/seal-document.ts
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@@ -17,6 +17,7 @@ import { getFile } from '../../universal/upload/get-file';
import { putPdfFile } from '../../universal/upload/put-file';
import { getCertificatePdf } from '../htmltopdf/get-certificate-pdf';
import { flattenAnnotations } from '../pdf/flatten-annotations';
import { flattenForm } from '../pdf/flatten-form';
import { insertFieldInPDF } from '../pdf/insert-field-in-pdf';
import { normalizeSignatureAppearances } from '../pdf/normalize-signature-appearances';
import { triggerWebhook } from '../webhooks/trigger/trigger-webhook';
@@ -101,8 +102,11 @@ export const sealDocument = async ({
// Normalize and flatten layers that could cause issues with the signature
normalizeSignatureAppearances(doc);
doc.getForm().flatten();
console.log('normalized');
flattenForm(doc);
console.log('flattened');
flattenAnnotations(doc);
console.log('annotations');
if (certificate) {
const certificatePages = await doc.copyPages(certificate, certificate.getPageIndices());