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Fix xml metadata #1534

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Fix xml metadata #1534

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b586af0
fix(metadata): correct PDF metadata key from `Creator` to `Producer`
xTCry Jul 6, 2024
427119d
chore(metadata): make field `Producer` optional
xTCry Jul 6, 2024
9b3cee4
chore(metadata): make field `Creator` as `CreatorTool` optional
xTCry Jul 6, 2024
8dc3ed6
chore(metadata): improve tabulating for drawing xml tree
xTCry Jul 6, 2024
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25 changes: 14 additions & 11 deletions lib/metadata.js
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Original file line number Diff line number Diff line change
@@ -1,25 +1,28 @@
import { sfix } from "./string"

class PDFMetadata {
constructor() {
this._metadata = `
this._metadata = sfix`
<?xpacket begin="\ufeff" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<x:xmpmeta xmlns:x="adobe:ns:meta/">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">

`;
}

_closeTags() {
this._metadata = this._metadata.concat(`
</rdf:RDF>
this._metadata = this._metadata.concat(
' </rdf:RDF>\n' +
sfix`
</x:xmpmeta>
<?xpacket end="w"?>
`);
<?xpacket end="w"?>`,
);
}

append(xml, newline=true) {
this._metadata = this._metadata.concat(xml);
append(xml, newline = true) {
this._metadata = this._metadata.concat(xml);
if (newline)
this._metadata = this._metadata.concat('\n');
this._metadata = this._metadata.concat('\n');
}

getXML() { return this._metadata; }
Expand Down
103 changes: 63 additions & 40 deletions lib/mixins/metadata.js
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Original file line number Diff line number Diff line change
@@ -1,78 +1,101 @@
import PDFMetadata from "../metadata"
import { sfix } from "../string"

export default {
initMetadata() {
this.metadata = new PDFMetadata();
},

appendXML(xml, newline=true) { this.metadata.append(xml,newline); },
appendXML(xml, tabs = 0, newline = true) {
tabs += 2
xml = xml.split('\n').map(x => ' '.repeat(4).repeat(tabs) + x).join('\n');
this.metadata.append(xml, newline);
},

_addInfo() {
this.appendXML(`
<rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/">
<xmp:CreateDate>${this.info.CreationDate.toISOString().split('.')[0]+"Z"}</xmp:CreateDate>
<xmp:CreatorTool>${this.info.Creator}</xmp:CreatorTool>
</rdf:Description>
`
this.appendXML(
sfix`
<rdf:Description rdf:about=""
xmlns:xmp="http://ns.adobe.com/xap/1.0/"
xmlns:pdf="http://ns.adobe.com/pdf/1.3/"
xmlns:dc="http://purl.org/dc/elements/1.1/">`,
0,
);
this.appendXML(
sfix`
<xmp:CreateDate>${this.info.CreationDate.toISOString().split('.')[0] + 'Z'}</xmp:CreateDate>`,
1,
);
if (this.info.Creator) {
this.appendXML(
sfix`
<xmp:CreatorTool>${this.info.Creator}</xmp:CreatorTool>`,
1,
);
}

if (this.info.Title || this.info.Author || this.info.Subject) {
this.appendXML(`
<rdf:Description rdf:about="" xmlns:dc="http://purl.org/dc/elements/1.1/">
`);

if (this.info.Title) {
this.appendXML(`
if (this.info.Title) {
this.appendXML(
sfix`
<dc:title>
<rdf:Alt>
<rdf:li xml:lang="x-default">${this.info.Title}</rdf:li>
</rdf:Alt>
</dc:title>
`);
}
</dc:title>`,
1,
);
}

if (this.info.Author) {
this.appendXML(`
if (this.info.Author) {
this.appendXML(
sfix`
<dc:creator>
<rdf:Seq>
<rdf:li>${this.info.Author}</rdf:li>
</rdf:Seq>
</dc:creator>
`);
}
</dc:creator>`,
1,
);
}

if (this.info.Subject) {
this.appendXML(`
if (this.info.Subject) {
this.appendXML(
sfix`
<dc:description>
<rdf:Alt>
<rdf:li xml:lang="x-default">${this.info.Subject}</rdf:li>
</rdf:Alt>
</dc:description>
`);
}

this.appendXML(`
</rdf:Description>
`);
</dc:description>`,
1,
);
}

this.appendXML(`
<rdf:Description rdf:about="" xmlns:pdf="http://ns.adobe.com/pdf/1.3/">
<pdf:Producer>${this.info.Creator}</pdf:Producer>`, false);
if (this.info.Producer) {
this.appendXML(
sfix`
<pdf:Producer>${this.info.Producer}</pdf:Producer>`,
1,
);
}

if (this.info.Keywords) {
this.appendXML(`
<pdf:Keywords>${this.info.Keywords}</pdf:Keywords>`, false);
this.appendXML(
sfix`
<pdf:Keywords>${this.info.Keywords}</pdf:Keywords>`,
1,
);
}

this.appendXML(`
</rdf:Description>
`);
this.appendXML(
sfix`
</rdf:Description>`,
0,
);
},

endMetadata() {
this._addInfo();

this.metadata.end();

/*
Expand Down
12 changes: 6 additions & 6 deletions lib/mixins/pdfa.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import fs from 'fs';
import { sfix } from "../string"

export default {
initPDFA(pSubset) {
Expand Down Expand Up @@ -42,12 +43,11 @@ export default {
},

_getPdfaid() {
return `
<rdf:Description xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/" rdf:about="">
<pdfaid:part>${this.subset}</pdfaid:part>
<pdfaid:conformance>${this.subset_conformance}</pdfaid:conformance>
</rdf:Description>
`;
return sfix`
<rdf:Description xmlns:pdfaid="http://www.aiim.org/pdfa/ns/id/" rdf:about="">
<pdfaid:part>${this.subset}</pdfaid:part>
<pdfaid:conformance>${this.subset_conformance}</pdfaid:conformance>
</rdf:Description>`;
},

_addPdfaMetadata() {
Expand Down
6 changes: 3 additions & 3 deletions lib/mixins/pdfua.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import { sfix } from "../string"

export default {

Expand All @@ -14,11 +15,10 @@ export default {
},

_getPdfuaid() {
return `
return sfix`
<rdf:Description xmlns:pdfuaid="http://www.aiim.org/pdfua/ns/id/" rdf:about="">
<pdfuaid:part>${this.subset}</pdfuaid:part>
</rdf:Description>
`;
</rdf:Description>`;
},

}
12 changes: 12 additions & 0 deletions lib/string.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@

export const sfix = (strings, ...expressions) => {
const indent = !strings[0].startsWith('\n')
? null
: new RegExp(`\n {${strings[0].match(/\n+( *)/)[1].length}}`, 'g');
return expressions
.reduce(
(acc, expr, i) => `${acc}${expr}${strings[i + 1].replace(indent, '\n')}`,
strings[0].replace(indent, '\n'),
)
.replace(/^\n|\n$/g, '');
};