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fix: normalize and flatten annotations

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This commit is contained in:
Mythie
2024-03-27 17:20:52 +07:00
parent 4d2228f679
commit b491bd4db9
4 changed files with 160 additions and 82 deletions
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120
packages/signing/helpers/add-signing-placeholder.ts
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@ -1,5 +1,6 @@
import {
PDFArray,
PDFDict,
PDFDocument,
PDFHexString,
PDFName,
@ -16,7 +17,7 @@ export type AddSigningPlaceholderOptions = {
export const addSigningPlaceholder = async ({ pdf }: AddSigningPlaceholderOptions) => {
const doc = await PDFDocument.load(pdf);
const pages = doc.getPages();
const [firstPage] = doc.getPages();
const byteRange = PDFArray.withContext(doc.context);
@ -25,64 +26,71 @@ export const addSigningPlaceholder = async ({ pdf }: AddSigningPlaceholderOption
byteRange.push(PDFName.of(BYTE_RANGE_PLACEHOLDER));
byteRange.push(PDFName.of(BYTE_RANGE_PLACEHOLDER));
const signature = doc.context.obj({
Type: 'Sig',
Filter: 'Adobe.PPKLite',
SubFilter: 'adbe.pkcs7.detached',
ByteRange: byteRange,
Contents: PDFHexString.fromText(' '.repeat(8192)),
Reason: PDFString.of('Signed by Documenso'),
M: PDFString.fromDate(new Date()),
});
const signatureRef = doc.context.register(signature);
const widget = doc.context.obj({
Type: 'Annot',
Subtype: 'Widget',
FT: 'Sig',
Rect: [0, 0, 0, 0],
V: signatureRef,
T: PDFString.of('Signature1'),
F: 4,
P: pages[0].ref,
});
const xobj = widget.context.formXObject([rectangle(0, 0, 0, 0)]);
const streamRef = widget.context.register(xobj);
widget.set(PDFName.of('AP'), widget.context.obj({ N: streamRef }));
const widgetRef = doc.context.register(widget);
let widgets = pages[0].node.get(PDFName.of('Annots'));
if (widgets instanceof PDFArray) {
widgets.push(widgetRef);
} else {
const newWidgets = PDFArray.withContext(doc.context);
newWidgets.push(widgetRef);
pages[0].node.set(PDFName.of('Annots'), newWidgets);
widgets = pages[0].node.get(PDFName.of('Annots'));
}
if (!widgets) {
throw new Error('No widgets');
}
pages[0].node.set(PDFName.of('Annots'), widgets);
doc.catalog.set(
PDFName.of('AcroForm'),
const signature = doc.context.register(
doc.context.obj({
SigFlags: 3,
Fields: [widgetRef],
Type: 'Sig',
Filter: 'Adobe.PPKLite',
SubFilter: 'adbe.pkcs7.detached',
ByteRange: byteRange,
Contents: PDFHexString.fromText(' '.repeat(8192)),
Reason: PDFString.of('Signed by Documenso'),
M: PDFString.fromDate(new Date()),
}),
);
const widget = doc.context.register(
doc.context.obj({
Type: 'Annot',
Subtype: 'Widget',
FT: 'Sig',
Rect: [0, 0, 0, 0],
V: signature,
T: PDFString.of('Signature1'),
F: 4,
P: firstPage.ref,
AP: doc.context.obj({
N: doc.context.register(doc.context.formXObject([rectangle(0, 0, 0, 0)])),
}),
}),
);
let widgets: PDFArray;
try {
widgets = firstPage.node.lookup(PDFName.of('Annots'), PDFArray);
} catch {
widgets = PDFArray.withContext(doc.context);
firstPage.node.set(PDFName.of('Annots'), widgets);
}
widgets.push(widget);
let arcoForm: PDFDict;
try {
arcoForm = doc.catalog.lookup(PDFName.of('AcroForm'), PDFDict);
} catch {
arcoForm = doc.context.obj({
Fields: PDFArray.withContext(doc.context),
});
doc.catalog.set(PDFName.of('AcroForm'), arcoForm);
}
let fields: PDFArray;
try {
fields = arcoForm.lookup(PDFName.of('Fields'), PDFArray);
} catch {
fields = PDFArray.withContext(doc.context);
arcoForm.set(PDFName.of('Fields'), fields);
}
fields.push(widget);
arcoForm.set(PDFName.of('SigFlags'), PDFNumber.of(3));
return Buffer.from(await doc.save({ useObjectStreams: false }));
};