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Shared utilities: logging, IDs, safe paths.
"""
import hashlib
import json
import logging
import os
from pathlib import Path
from typing import Any, Dict, List, Optional
from uuid import uuid4
from backend.config import DATA_ROOT, LOGS_DIR, MOCK_USER
# Logging: write to file and console
_log_file = LOGS_DIR / "app.log"
logging.basicConfig(
level=logging.INFO,
format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
handlers=[
logging.FileHandler(_log_file, encoding="utf-8"),
logging.StreamHandler(),
],
)
logger = logging.getLogger("notebooklm")
def get_username_from_request(request: Any) -> str:
"""
Derive username from Gradio request (HF OAuth) or MOCK_USER.
request may be None in local dev or when Gradio doesn't pass it.
"""
if MOCK_USER:
return MOCK_USER
if request is not None:
# Gradio 4.x: request can have .username from HF OAuth
if hasattr(request, "username") and request.username:
return str(request.username).strip()
if hasattr(request, "user") and request.user:
u = request.user
if isinstance(u, dict) and u.get("username"):
return str(u["username"]).strip()
if hasattr(u, "username"):
return str(u.username).strip()
# Some setups pass username in headers
if hasattr(request, "headers"):
h = getattr(request, "headers", {}) or {}
if isinstance(h, dict) and h.get("x-username"):
return str(h["x-username"]).strip()
return "anonymous"
def user_data_dir(username: str) -> Path:
"""Path to /data/users/<username>. Validates no path escape."""
username = (username or "").strip() or "anonymous"
if ".." in username or "/" in username or "\\" in username:
username = "anonymous"
root = DATA_ROOT.resolve()
path = (root / "users" / username).resolve()
if not str(path).startswith(str(root)):
path = root / "users" / "anonymous"
return path
def ensure_dir(path: Path) -> Path:
path.mkdir(parents=True, exist_ok=True)
return path
def new_uuid() -> str:
return str(uuid4())
def file_hash(path: Path) -> str:
"""SHA256 hash of file for dedupe."""
h = hashlib.sha256()
with open(path, "rb") as f:
for chunk in iter(lambda: f.read(8192), b""):
h.update(chunk)
return h.hexdigest()
def read_json(path: Path, default: Any = None) -> Any:
if default is None:
default = {}
if not path.exists():
return default
try:
with open(path, "r", encoding="utf-8") as f:
return json.load(f)
except (json.JSONDecodeError, OSError) as e:
logger.warning("read_json %s: %s", path, e)
return default
def write_json(path: Path, data: Any) -> None:
ensure_dir(path.parent)
with open(path, "w", encoding="utf-8") as f:
json.dump(data, f, indent=2, ensure_ascii=False)
def read_jsonl(path: Path) -> List[Dict[str, Any]]:
if not path.exists():
return []
out: List[Dict[str, Any]] = []
with open(path, "r", encoding="utf-8") as f:
for line in f:
line = line.strip()
if not line:
continue
try:
out.append(json.loads(line))
except json.JSONDecodeError:
continue
return out
def append_jsonl(path: Path, record: Dict[str, Any]) -> None:
ensure_dir(path.parent)
with open(path, "a", encoding="utf-8") as f:
f.write(json.dumps(record, ensure_ascii=False) + "\n")
def normalize_text(text: str) -> str:
"""Normalize whitespace and strip."""
if not text:
return ""
return " ".join(text.split()).strip()
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