added RaG

web/backend/app/services/espd/pdf_preview.py

@@ -0,0 +1,65 @@
+"""Convert DOCX bytes to PDF via LibreOffice headless."""
+
+from __future__ import annotations
+
+import shutil
+import subprocess
+import tempfile
+from pathlib import Path
+
+
+class PdfConversionError(RuntimeError):
+    pass
+
+
+def find_soffice() -> str | None:
+    for name in ("soffice", "libreoffice"):
+        path = shutil.which(name)
+        if path:
+            return path
+    # common Windows / Linux paths
+    for candidate in (
+        r"C:\Program Files\LibreOffice\program\soffice.exe",
+        "/usr/bin/soffice",
+        "/usr/bin/libreoffice",
+    ):
+        if Path(candidate).exists():
+            return candidate
+    return None
+
+
+def docx_bytes_to_pdf(docx_bytes: bytes, timeout_sec: int = 120) -> bytes:
+    soffice = find_soffice()
+    if not soffice:
+        raise PdfConversionError(
+            "LibreOffice (soffice) не найден. Установите libreoffice-writer в контейнере API."
+        )
+    with tempfile.TemporaryDirectory(prefix="espd_preview_") as tmp:
+        tmp_path = Path(tmp)
+        src = tmp_path / "document.docx"
+        src.write_bytes(docx_bytes)
+        try:
+            proc = subprocess.run(
+                [
+                    soffice,
+                    "--headless",
+                    "--nologo",
+                    "--nofirststartwizard",
+                    "--convert-to",
+                    "pdf",
+                    "--outdir",
+                    str(tmp_path),
+                    str(src),
+                ],
+                capture_output=True,
+                text=True,
+                timeout=timeout_sec,
+                check=False,
+            )
+        except subprocess.TimeoutExpired as e:
+            raise PdfConversionError("Таймаут конвертации DOCX→PDF") from e
+        pdf_path = tmp_path / "document.pdf"
+        if proc.returncode != 0 or not pdf_path.exists():
+            detail = (proc.stderr or proc.stdout or "").strip()[:500]
+            raise PdfConversionError(f"Ошибка LibreOffice: {detail or proc.returncode}")
+        return pdf_path.read_bytes()