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XFA - Save filled data in the pdf when downloading the file (Bug 1716288)

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- when binding (after parsing) we get a map between some template nodes and some data nodes;
  - so set user data in input handlers in using data node uids in the annotation storage;
  - to save the form, just put the value we have in the storage in the correct data nodes, serialize the xml as a string and then write the string at the end of the pdf using src/core/writer.js;
  - fix few bugs around data bindings:
    - the "Off" issue in Bug 1716980.
This commit is contained in:
Calixte Denizet 2021-06-25 14:31:55 +02:00
parent d7fdb72a3f
commit 429ffdcd2f
17 changed files with 71564 additions and 113 deletions
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28
src/core/writer.js
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@ -123,12 +123,7 @@ function computeMD5(filesize, xrefInfo) {
return bytesToString(calculateMD5(array));
}
function updateXFA(datasetsRef, newRefs, xref) {
if (datasetsRef === null || xref === null) {
return;
}
const datasets = xref.fetchIfRef(datasetsRef);
const str = datasets.getString();
function writeXFADataForAcroform(str, newRefs) {
const xml = new SimpleXMLParser({ hasAttributes: true }).parseFromString(str);
for (const { xfa } of newRefs) {
@ -148,7 +143,17 @@ function updateXFA(datasetsRef, newRefs, xref) {
}
const buffer = [];
xml.documentElement.dump(buffer);
let updatedXml = buffer.join("");
return buffer.join("");
}
function updateXFA(xfaData, datasetsRef, newRefs, xref) {
if (datasetsRef === null || xref === null) {
return;
}
if (xfaData === null) {
const datasets = xref.fetchIfRef(datasetsRef);
xfaData = writeXFADataForAcroform(datasets.getString(), newRefs);
}
const encrypt = xref.encrypt;
if (encrypt) {
@ -156,12 +161,12 @@ function updateXFA(datasetsRef, newRefs, xref) {
datasetsRef.num,
datasetsRef.gen
);
updatedXml = transform.encryptString(updatedXml);
xfaData = transform.encryptString(xfaData);
}
const data =
`${datasetsRef.num} ${datasetsRef.gen} obj\n` +
`<< /Type /EmbeddedFile /Length ${updatedXml.length}>>\nstream\n` +
updatedXml +
`<< /Type /EmbeddedFile /Length ${xfaData.length}>>\nstream\n` +
xfaData +
"\nendstream\nendobj\n";
newRefs.push({ ref: datasetsRef, data });
@ -173,8 +178,9 @@ function incrementalUpdate({
newRefs,
xref = null,
datasetsRef = null,
xfaData = null,
}) {
updateXFA(datasetsRef, newRefs, xref);
updateXFA(xfaData, datasetsRef, newRefs, xref);
const newXref = new Dict(null);
const refForXrefTable = xrefInfo.newRef;