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| import { promisify } from "util"; | |
| import JSZip from "jszip"; | |
| let _convert: | |
| | ((buf: Buffer, ext: string, filter: undefined) => Promise<Buffer>) | |
| | null = null; | |
| async function getConvert() { | |
| if (!_convert) { | |
| const libre = await import("libreoffice-convert"); | |
| _convert = promisify(libre.default.convert.bind(libre.default)); | |
| } | |
| return _convert; | |
| } | |
| /** | |
| * Some older Windows/Word archives store .docx entries with backslash | |
| * separators (e.g. `word\document.xml`). Mammoth and LibreOffice both look | |
| * up entries by exact string and miss those files, producing empty output | |
| * or conversion failures. Rewrite any such entries to the canonical | |
| * forward-slash form before handing the buffer off. | |
| */ | |
| export async function normalizeDocxZipPaths(buffer: Buffer): Promise<Buffer> { | |
| let zip: JSZip; | |
| try { | |
| zip = await JSZip.loadAsync(buffer); | |
| } catch { | |
| return buffer; | |
| } | |
| const renames: [string, string][] = []; | |
| zip.forEach((relativePath) => { | |
| if (relativePath.includes("\\")) { | |
| renames.push([relativePath, relativePath.replace(/\\/g, "/")]); | |
| } | |
| }); | |
| if (renames.length === 0) return buffer; | |
| for (const [oldPath, newPath] of renames) { | |
| const entry = zip.file(oldPath); | |
| if (!entry) continue; | |
| const content = await entry.async("nodebuffer"); | |
| zip.remove(oldPath); | |
| zip.file(newPath, content); | |
| } | |
| return zip.generateAsync({ type: "nodebuffer" }); | |
| } | |
| /** | |
| * Convert a DOCX/DOC buffer to PDF using LibreOffice. | |
| * Throws if LibreOffice is not installed or conversion fails. | |
| */ | |
| export async function docxToPdf(buffer: Buffer): Promise<Buffer> { | |
| const convert = await getConvert(); | |
| const normalized = await normalizeDocxZipPaths(buffer); | |
| return convert(normalized, ".pdf", undefined); | |
| } | |
| export function convertedPdfKey(userId: string, docId: string): string { | |
| return `converted-pdfs/${userId}/${docId}.pdf`; | |
| } | |