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SnapOtterandGitHub
8b3f1e6884
Conversion engines wrote their own names into PDF metadata: LibreOffice, Ghostscript, pdfcpu, WeasyPrint, and PDFKit all stamped Producer/Creator on generated files. A new doc_scrub_meta docs-profile script (PyMuPDF) rewrites both fields to SnapOtter and drops the stale XMP copy; the worker applies it to the 25 PDF-generating tools before outputs reach object storage. Best effort by design: any failure keeps the original bytes and only logs a warning. Deliberately untouched: tools that edit the user's own PDF and preserve its metadata (qpdf edits, sign, flatten), encrypted outputs (copied through), and pdfa-convert, where a metadata rewrite risks PDF/A conformance. Claude-Session: https://claude.ai/code/session_01XGB4pGvTvb7sUX4JN745U7
76 lines
2.4 KiB
TypeScript
76 lines
2.4 KiB
TypeScript
import { mkdtemp, readFile, rm, writeFile } from "node:fs/promises";
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import { tmpdir } from "node:os";
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import { join } from "node:path";
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import { pdfScrubProducerPy } from "@snapotter/doc-engine";
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/**
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* Tools whose PDF output is GENERATED by a conversion engine that stamps its
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* own name into the Producer/Creator metadata (LibreOffice, Ghostscript,
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* pdfcpu, WeasyPrint, PDFKit, the OCR pipeline). Their outputs get SnapOtter
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* stamped instead; see scrubPdfProducer.
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*
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* Deliberately excluded: tools that edit the user's own PDF and preserve its
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* metadata (merge/split/rotate/protect/unlock/repair/linearize via qpdf,
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* sign-pdf and flatten-pdf via PyMuPDF incremental edits) and pdfa-convert,
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* where rewriting metadata after conversion risks PDF/A conformance.
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*/
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export const SCRUB_PDF_PRODUCER_TOOLS: ReadonlySet<string> = new Set([
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// LibreOffice conversions
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"convert-document",
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"convert-presentation",
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"convert-spreadsheet",
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"word-to-pdf",
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"excel-to-pdf",
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"powerpoint-to-pdf",
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// WeasyPrint
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"html-to-pdf",
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"markdown-to-pdf",
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// pandoc/WeasyPrint chains
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"epub-convert",
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// Ghostscript rewrites (these clobber the user's Producer anyway)
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"compress-pdf",
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"grayscale-pdf",
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// pdfcpu layout tools (pdfcpu stamps itself on every write)
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"crop-pdf",
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"nup-pdf",
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"booklet-pdf",
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"watermark-pdf",
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"pdf-page-numbers",
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// OCR produces a new searchable PDF
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"ocr-pdf",
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// PDFKit image-to-PDF family
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"image-to-pdf",
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"jpg-to-pdf",
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"png-to-pdf",
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"heic-to-pdf",
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"tiff-to-pdf",
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"webp-to-pdf",
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"gif-to-pdf",
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"eps-to-pdf",
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]);
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/**
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* Replace the conversion engine's Producer/Creator metadata with SnapOtter.
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* Best effort by design: any failure (missing PyMuPDF, malformed PDF,
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* dispatcher down) returns the original buffer unchanged so a cosmetic
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* metadata pass can never fail a job.
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*/
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export async function scrubPdfProducer(buffer: Buffer): Promise<Buffer> {
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let dir: string | null = null;
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try {
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dir = await mkdtemp(join(tmpdir(), "pdf-scrub-"));
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const inPath = join(dir, "in.pdf");
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const outPath = join(dir, "out.pdf");
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await writeFile(inPath, buffer);
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await pdfScrubProducerPy(inPath, outPath);
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return await readFile(outPath);
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} catch (err) {
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console.warn(
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`[pdf-scrub] keeping original metadata: ${err instanceof Error ? err.message : String(err)}`,
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);
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return buffer;
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} finally {
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if (dir) await rm(dir, { recursive: true, force: true }).catch(() => {});
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}
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}
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