needs to generate and update missing DocumentID and instanceID of the links of .indd Indesign files through extend script - adobe

Question

I am using Mac with InDesign CC 219, and in my .indd file, some of the links are missing DocumentID and InstanceID, the below is the code I am using to get those details. If for any of the links, DocumentID and InstanceID are missing then I need to generate random DocumentID and InstanceID, and update the relevant links meta data. Is it possible through scripting, any directions please...
var doc = app.activeDocument;
for (var i = 0, len = doc.links.length; i < len; i++) {
var linkFilepath = File(doc.links[i].filePath).fsName;
var linkFileName = doc.links[i].name;
var xmpFile = new XMPFile(linkFilepath, XMPConst.FILE_INDESIGN, XMPConst.OPEN_FOR_READ);
var allXMP = xmpFile.getXMP();
// Retrieve values from external links XMP.
var documentID = allXMP.getProperty(XMPConst.NS_XMP_MM, 'DocumentID', XMPConst.STRING);
var instanceID = allXMP.getProperty(XMPConst.NS_XMP_MM, 'InstanceID', XMPConst.STRING);
}

Answer 1

$.level=0;
// Warn if there are no documents open.
if (!app.documents.length) {
alert('Open a document and try again.', 'Missing Document', false);
exit();
}
var doc = app.activeDocument;
// load XMP Library
function loadXMPLibrary() {
if (!ExternalObject.AdobeXMPScript) {
try {
ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
} catch (e) {
alert('Failed loading AdobeXMPScript library\n' + e.message, 'Error', true);
return false;
}
}
return true;
}
// Check all link statuses are be ok.
function linksStatusCheck(doc) {
for (var i = 0, len = doc.links.length; i < len; i++) {
if (doc.links[i].status !== LinkStatus.NORMAL) {
alert('The status of all links must be OK \nPlease update link status ' +
'via the Links panel and try again', 'Link Status', true);
exit();
}
}
return true;
}
function randomString(length, chars) {
var randomGenStr = '';
for (var i = length; i > 0; --i) {
randomGenStr += chars[Math.floor(Math.random() * chars.length)];
}
return randomGenStr;
}
function randomString(length) {
var text = "";
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for(var k = 0; k < length; k++) {
text += possible.charAt(Math.floor(Math.random() * possible.length));
}
return text;
}
function checkLinksXMP(doc) {
for (var i = 0, len = doc.links.length; i < len; i++) {
var linkFilepath = File(doc.links[i].filePath).fsName;
var linkFileName = doc.links[i].name;
var xmpFile = new XMPFile(linkFilepath, XMPConst.FILE_INDESIGN, XMPConst.OPEN_FOR_UPDATE);
var allXMP = xmpFile.getXMP();
// Retrieve values from external links XMP.
var documentID = allXMP.getProperty(XMPConst.NS_XMP_MM, 'DocumentID', XMPConst.STRING);
var instanceID = allXMP.getProperty(XMPConst.NS_XMP_MM, 'InstanceID', XMPConst.STRING);
// Useful for testing purposes....
// Log properties for each link to the console.
// Notify user when XMP is missing...
var docMissingCnt = 0;
var insMissingCnt = 0;
if (!documentID && !instanceID) {
alert('Link missing DocumentID and InstanceID\n' +
'Name: ' + linkFileName + '\n\n' +
'Path: ' + linkFilepath, 'Missing XMP', true);
docMissingCnt++;
insMissingCnt++;
} else if (!documentID) {
alert('Link missing DocumentID\n' +
'Name: ' + linkFileName + '\n\n' +
'Path: ' + linkFilepath, 'Missing XMP', true);
docMissingCnt++;
} else if (!instanceID) {
alert('Link missing InstanceID\n' +
'Name: ' + linkFileName + '\n\n' +
'Path: ' + linkFilepath, 'Missing XMP', true);
insMissingCnt++;
}
if(docMissingCnt > 0) {
documentID = randomString(32);
allXMP.setProperty(XMPConst.NS_XMP_MM, 'DocumentID', documentID);
var documentIDNew = allXMP.getProperty(XMPConst.NS_XMP_MM, 'DocumentID', XMPConst.STRING);
$.writeln('DocumentID - New : ' + documentIDNew);
docMissingCnt = 0;
}
if(insMissingCnt > 0) {
instanceID = randomString(32);
allXMP.setProperty(XMPConst.NS_XMP_MM, 'InstanceID', instanceID);
var instanceIDNew = allXMP.getProperty(XMPConst.NS_XMP_MM, 'InstanceID', XMPConst.STRING);
$.writeln('InstanceID - New : ' + instanceIDNew);
insMissingCnt = 0;
}
}
}
if (loadXMPLibrary() && linksStatusCheck(doc)) {
checkLinksXMP(doc);
}