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cista-storage/cista/onlyoffice.py
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Leo Vasanko 49cb4a8255 Separate OnlyOffice async handling, add office_previews WS flag, framed worker protocol 
- Move OnlyOffice conversion out of worker subprocesses into async event loop
  using httpx.AsyncClient with shared client and clean shutdown hook
- Add OOConversionManager with in-flight deduplication (asyncio.Future) and
  configurable concurrency limit (OO_MAX_CONCURRENT=2)
- Add 10s total timeout for office previews via asyncio.wait_for
- Return 503 when OnlyOffice is unavailable, 504 on timeout
- Remove office handling from worker dispatch(); workers now only do
  images, video, and PDFs
- Replace PNG tempfile bridge with framed binary input protocol on worker
  stdin: (json_size)(data_size)(json)(raw_data)
- Add process_image_buffer() for in-memory AVIF conversion via pyvips
- Add office_previews to WS server message, cached every 30s from OO
  availability check
- Frontend gates only office document previews on office_previews flag;
  images, video, PDFs remain unconditional
- Change default OnlyOffice port from 8080 to 8988
2026-05-01 03:42:03 +00:00

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"""OnlyOffice Document Server integration for office document preview.
Provides server-side conversion of office documents to PNG via the
OnlyOffice Document Server /ConvertService.ashx API. The resulting PNG
is passed through pyvips for AVIF compression.
Environment requirements:
- OnlyOffice Document Server must be running and reachable.
- If Document Server runs in Docker, the callback host IP must be
reachable from the container (usually the docker bridge IP).
"""
import asyncio
import json
import os
import socket
import socketserver
import subprocess
import threading
import urllib.request
from functools import partial
from http.server import SimpleHTTPRequestHandler
from pathlib import Path
from time import perf_counter
from urllib.parse import quote
import httpx
import jwt
from sanic.log import logger
# ---------------------------------------------------------------------------
# Configuration helpers
# ---------------------------------------------------------------------------
_httpx_client: httpx.AsyncClient | None = None
def _get_onlyoffice_url() -> str:
return os.environ.get("ONLYOFFICE_URL", "http://localhost:8988")
def _get_jwt_secret() -> str | None:
return os.environ.get("ONLYOFFICE_JWT_SECRET") or None
def _get_callback_host() -> str:
"""Return the host IP that OnlyOffice (usually in Docker) can use to reach us."""
if host := os.environ.get("ONLYOFFICE_CALLBACK_HOST"):
return host
# Try to auto-detect docker bridge IP
try:
result = subprocess.run(
["/sbin/ip", "-4", "addr", "show", "docker0"],
capture_output=True,
text=True,
timeout=2,
check=False,
)
for line in result.stdout.splitlines():
if "inet " in line:
parts = line.strip().split()
addr_part = parts[1] # e.g. 172.17.0.1/16
return addr_part.split("/")[0]
except Exception:
logger.debug("Failed to auto-detect docker bridge IP")
return "127.0.0.1"
# ---------------------------------------------------------------------------
# Async HTTP client
# ---------------------------------------------------------------------------
def get_httpx_client() -> httpx.AsyncClient:
"""Return the shared async HTTP client for OnlyOffice requests."""
global _httpx_client
if _httpx_client is None:
_httpx_client = httpx.AsyncClient()
return _httpx_client
async def close_oo_client() -> None:
"""Close the shared async HTTP client."""
global _httpx_client
if _httpx_client is not None:
await _httpx_client.aclose()
_httpx_client = None
# ---------------------------------------------------------------------------
# Availability check
# ---------------------------------------------------------------------------
def is_available() -> bool:
"""Return True if the configured OnlyOffice Document Server is reachable."""
url = _get_onlyoffice_url().rstrip("/") + "/ConvertService.ashx"
try:
with urllib.request.urlopen(url, timeout=3) as resp: # noqa: S310
return resp.status in (200, 405) # 405 Method Not Allowed is fine, means endpoint exists
except Exception:
return False
async def is_available_async(timeout: float = 2.0) -> bool:
"""Return True if the configured OnlyOffice Document Server is reachable."""
url = _get_onlyoffice_url().rstrip("/") + "/ConvertService.ashx"
client = get_httpx_client()
try:
response = await client.get(url, timeout=timeout)
return response.status_code in (200, 405)
except Exception:
return False
_oo_available_cache: tuple[bool, float] | None = None
OO_AVAILABILITY_CACHE_TTL = 30.0
async def is_available_cached() -> bool:
"""Return cached OnlyOffice availability, refreshed every 30 seconds."""
global _oo_available_cache
now = perf_counter()
if _oo_available_cache is not None:
result, timestamp = _oo_available_cache
if now - timestamp < OO_AVAILABILITY_CACHE_TTL:
return result
result = await is_available_async()
_oo_available_cache = (result, now)
return result
# ---------------------------------------------------------------------------
# Temporary HTTP server so OnlyOffice can download the file
# ---------------------------------------------------------------------------
class _QuietHandler(SimpleHTTPRequestHandler):
def log_message(self, fmt, *args) -> None:
pass
def _get_free_port() -> int:
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind(("0.0.0.0", 0)) # noqa: S104
return s.getsockname()[1]
def _serve_file_temporarily(file_path: Path):
"""Start a temporary HTTP server for *file_path* and return (url, server)."""
directory = str(file_path.parent)
filename = file_path.name
port = _get_free_port()
handler = partial(_QuietHandler, directory=directory)
httpd = socketserver.TCPServer(("0.0.0.0", port), handler) # noqa: S104
thread = threading.Thread(target=httpd.serve_forever, daemon=True)
thread.start()
host = _get_callback_host()
url = f"http://{host}:{port}/{quote(filename)}"
return url, httpd
# ---------------------------------------------------------------------------
# OnlyOffice conversion client
# ---------------------------------------------------------------------------
def _build_jwt_token(payload: dict) -> str | None:
secret = _get_jwt_secret()
if not secret:
return None
return jwt.encode(payload, secret, algorithm="HS256")
def convert_to_png(file_path: Path, timeout: float = 5.0) -> bytes:
"""Convert *file_path* to PNG using OnlyOffice Document Server.
Returns the PNG bytes. Raises RuntimeError on failure.
"""
oo_url = _get_onlyoffice_url().rstrip("/")
convert_url = f"{oo_url}/ConvertService.ashx"
# Start temporary HTTP server so OnlyOffice can fetch the file
doc_url, httpd = _serve_file_temporarily(file_path)
try:
suffix = file_path.suffix.lstrip(".").lower()
payload = {
"async": False,
"filetype": suffix,
"key": f"cista_{file_path.stat().st_mtime_ns}",
"outputtype": "png",
"title": file_path.name,
"url": doc_url,
}
headers = {"Content-Type": "application/json"}
token = _build_jwt_token(payload)
if token:
# Conversion API expects JWT in request body when token checks are enabled.
payload["token"] = token
headers["Authorization"] = token
req = urllib.request.Request( # noqa: S310
convert_url,
data=json.dumps(payload).encode(),
headers=headers,
method="POST",
)
t_start = perf_counter()
with urllib.request.urlopen(req, timeout=timeout) as resp: # noqa: S310
body = resp.read()
t_end = perf_counter()
# Parse XML response
text = body.decode("utf-8", errors="replace")
if "<Error>" in text:
code = "unknown"
if "<Error>" in text and "</Error>" in text:
code = text.split("<Error>")[1].split("</Error>")[0]
raise RuntimeError(f"OnlyOffice conversion error: {code}")
if "<FileUrl>" not in text:
raise RuntimeError("OnlyOffice response did not contain FileUrl")
file_url = text.split("<FileUrl>")[1].split("</FileUrl>")[0]
file_url = file_url.replace("&amp;", "&")
logger.debug("OnlyOffice converted in %.2fs: %s", t_end - t_start, file_url)
# Download converted PNG
with urllib.request.urlopen(file_url, timeout=timeout) as png_resp: # noqa: S310
return png_resp.read()
finally:
httpd.shutdown()
async def convert_to_png_async(file_path: Path, timeout: float = 5.0) -> bytes:
"""Convert *file_path* to PNG using OnlyOffice Document Server (async).
Returns the PNG bytes. Raises RuntimeError on failure.
"""
oo_url = _get_onlyoffice_url().rstrip("/")
convert_url = f"{oo_url}/ConvertService.ashx"
client = get_httpx_client()
# Start temporary HTTP server so OnlyOffice can fetch the file
doc_url, httpd = await asyncio.to_thread(_serve_file_temporarily, file_path)
try:
suffix = file_path.suffix.lstrip(".").lower()
payload = {
"async": False,
"filetype": suffix,
"key": f"cista_{file_path.stat().st_mtime_ns}",
"outputtype": "png",
"title": file_path.name,
"url": doc_url,
}
headers = {"Content-Type": "application/json"}
token = _build_jwt_token(payload)
if token:
# Conversion API expects JWT in request body when token checks are enabled.
payload["token"] = token
headers["Authorization"] = token
t_start = perf_counter()
response = await client.post(
convert_url,
content=json.dumps(payload).encode(),
headers=headers,
timeout=timeout,
)
response.raise_for_status()
body = response.content
t_end = perf_counter()
# Parse XML response
text = body.decode("utf-8", errors="replace")
if "<Error>" in text:
code = "unknown"
if "<Error>" in text and "</Error>" in text:
code = text.split("<Error>")[1].split("</Error>")[0]
raise RuntimeError(f"OnlyOffice conversion error: {code}")
if "<FileUrl>" not in text:
raise RuntimeError("OnlyOffice response did not contain FileUrl")
file_url = text.split("<FileUrl>")[1].split("</FileUrl>")[0]
file_url = file_url.replace("&amp;", "&")
logger.debug("OnlyOffice converted in %.2fs: %s", t_end - t_start, file_url)
# Download converted PNG
png_response = await client.get(file_url, timeout=timeout)
png_response.raise_for_status()
return png_response.content
finally:
await asyncio.to_thread(httpd.shutdown)
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