backend/env.py

from __future__ import annotations

import os
from pathlib import Path


ROOT_DIR = Path(__file__).resolve().parents[1]
DOTENV_PATH = ROOT_DIR / ".env"


def _parse_env_value(raw_value: str) -> str:
    value = raw_value.strip()
    if not value:
        return ""
    if value[:1] == value[-1:] and value[:1] in {"'", '"'} and len(value) >= 2:
        value = value[1:-1]
    return value


def load_project_env() -> None:
    if not DOTENV_PATH.exists():
        return

    try:
        content = DOTENV_PATH.read_text(encoding="utf-8")
    except Exception:
        return

    for raw_line in content.splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#"):
            continue
        if line.startswith("export "):
            line = line[len("export ") :].lstrip()
        if "=" not in line:
            continue
        key, value = line.split("=", 1)
        key = key.strip()
        if not key or key in os.environ:
            continue
        comment_index = value.find(" #")
        if comment_index != -1 and value[:1] not in {"'", '"'}:
            value = value[:comment_index]
        os.environ[key] = _parse_env_value(value)


load_project_env()