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Make embedded timestamps reproducible and use SOURCE_DATE_EPOCH if available #87

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Make embedded timestamps reproducible and use SOURCE_DATE_EPOCH if available #87

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7da66ea
Use document date in file ID for reproducibility
t-8ch Jan 9, 2025
f030b50
Use document date in XML metadata for reproducibility
t-8ch Jan 9, 2025
1d29e7f
Use $SOURCE_DATE_EPOCH for document date if present
t-8ch Jan 9, 2025
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7 changes: 7 additions & 0 deletions fop-core/src/main/java/org/apache/fop/cli/CommandLineOptions.java
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@
import java.io.IOException;
import java.io.PrintStream;
import java.net.URI;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.Vector;
Expand Down Expand Up @@ -234,6 +235,12 @@ public boolean parse(String[] args)
//Make sure the prepared serializer is used
foUserAgent.setDocumentHandlerOverride(serializer);
}

String sourceDateEpoch = System.getenv("SOURCE_DATE_EPOCH");
if (sourceDateEpoch != null) {
foUserAgent.setCreationDate(new Date(1000 * Long.parseLong(sourceDateEpoch)));
}

return true;
}

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6 changes: 5 additions & 1 deletion fop-core/src/main/java/org/apache/fop/pdf/FileIDGenerator.java
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Expand Up @@ -86,7 +86,11 @@ byte[] getUpdatedFileID() {

private void generateFileID() {
DateFormat df = new SimpleDateFormat("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'SSS");
digest.update(PDFDocument.encode(df.format(new Date())));
Date date = this.document.getInfo().getCreationDate();
if (date == null) {
date = new Date();
}
digest.update(PDFDocument.encode(df.format(date)));
// Ignoring the filename here for simplicity even though it's recommended
// by the PDF spec
digest.update(PDFDocument.encode(String.valueOf(document.getCurrentFileSize())));
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6 changes: 5 additions & 1 deletion fop-core/src/main/java/org/apache/fop/render/pdf/PDFRenderingUtil.java
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Expand Up @@ -262,7 +262,11 @@ public void renderXMPMetadata(XMPMetadata metadata) {
fopXMP.mergeInto(docXMP, exclude);
XMPBasicAdapter xmpBasic = XMPBasicSchema.getAdapter(docXMP);
//Metadata was changed so update metadata date
xmpBasic.setMetadataDate(new java.util.Date());
Date date = userAgent.getCreationDate();
if (date == null) {
date = new Date();
}
xmpBasic.setMetadataDate(date);
PDFMetadata.updateInfoFromMetadata(docXMP, pdfDoc.getInfo());

PDFMetadata pdfMetadata = pdfDoc.getFactory().makeMetadata(
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