228 lines
8.2 KiB
Python
228 lines
8.2 KiB
Python
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"""Application settings management service."""
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from typing import Any
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from cryptography.fernet import Fernet, InvalidToken
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.core.config import settings
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from app.core.logging import get_logger
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from app.models.setting import AppSetting
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logger = get_logger(__name__)
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EDITABLE_SETTINGS = {
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"RSSKEEPER_BASE_URL": {"description": "rssKeeper 服务地址", "sensitive": False},
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"OPENAI_API_KEY": {"description": "LLM API Key", "sensitive": True},
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"OPENAI_BASE_URL": {"description": "LLM API 基础地址", "sensitive": False},
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"OPENAI_MODEL": {"description": "LLM 模型名", "sensitive": False},
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"OPENAI_TIMEOUT": {"description": "LLM 调用超时（秒）", "sensitive": False},
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"OPENAI_MAX_RETRIES": {"description": "LLM 最大重试次数", "sensitive": False},
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"SUMMARIZE_INTERVAL_MINUTES": {"description": "摘要任务间隔（分钟）", "sensitive": False},
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"TAG_SCORE_INTERVAL_MINUTES": {"description": "分类/打分/去重任务间隔（分钟）", "sensitive": False},
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"DAILY_BRIEF_HOUR": {"description": "每日简报生成小时", "sensitive": False},
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"DAILY_BRIEF_MINUTE": {"description": "每日简报生成分钟", "sensitive": False},
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"TITLE_SIMILARITY_THRESHOLD": {"description": "标题相似度阈值", "sensitive": False},
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"CONTENT_SIMILARITY_THRESHOLD": {"description": "内容相似度阈值", "sensitive": False},
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"MAX_AI_SUMMARY_LENGTH": {"description": "AI 摘要最大长度", "sensitive": False},
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"MIN_ORIGINAL_SUMMARY_LENGTH": {"description": "原始摘要最小长度", "sensitive": False},
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"BRIEF_TOP_N_PER_CATEGORY": {"description": "简报每分类显示文章数", "sensitive": False},
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"LOG_LEVEL": {"description": "日志级别", "sensitive": False},
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"API_TOKEN": {"description": "API 鉴权 Token（为空时不启用）", "sensitive": True},
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"CORS_ALLOWED_ORIGINS": {"description": "CORS 允许来源（逗号分隔）", "sensitive": False},
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}
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# Prefix to detect encrypted values
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_ENC_PREFIX = "enc:"
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def _get_fernet() -> Fernet | None:
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"""Get Fernet instance if encryption key is configured."""
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key = settings.SETTINGS_ENCRYPTION_KEY
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if not key:
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return None
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try:
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return Fernet(key.encode() if isinstance(key, str) else key)
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except Exception as exc:
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logger.error("SETTINGS_ENCRYPTION_KEY 无效: %s", exc)
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return None
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def _encrypt(value: str) -> str:
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"""Encrypt a sensitive value if encryption is enabled."""
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if not value:
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return value
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fernet = _get_fernet()
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if fernet is None:
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return value
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return _ENC_PREFIX + fernet.encrypt(value.encode()).decode()
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def _decrypt(value: str) -> str:
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"""Decrypt a sensitive value if it was encrypted."""
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if not value or not value.startswith(_ENC_PREFIX):
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return value
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fernet = _get_fernet()
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if fernet is None:
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logger.warning("发现加密配置值但 SETTINGS_ENCRYPTION_KEY 未配置，无法解密")
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return value
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try:
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ciphertext = value[len(_ENC_PREFIX):].encode()
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return fernet.decrypt(ciphertext).decode()
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except InvalidToken:
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logger.warning("配置值解密失败（token 无效）")
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return value
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except Exception as exc:
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logger.error("配置值解密失败: %s", exc)
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return value
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def _get_env_default(key: str) -> str:
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"""Get default value from environment/settings."""
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value = getattr(settings, key, "")
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return str(value) if value is not None else ""
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def _mask_sensitive(value: str) -> str:
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"""Mask sensitive value for display."""
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if not value:
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return ""
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if len(value) <= 8:
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return "*" * len(value)
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return f"{value[:4]}...{value[-4:]}"
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async def init_default_settings(db: AsyncSession) -> None:
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"""Initialize default settings from environment if table is empty."""
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result = await db.execute(select(AppSetting))
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existing = result.scalars().first()
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if existing:
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return
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for key, meta in EDITABLE_SETTINGS.items():
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default_value = _get_env_default(key)
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stored_value = _encrypt(default_value) if meta["sensitive"] else default_value
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db.add(
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AppSetting(
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key=key,
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value=stored_value,
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description=meta["description"],
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is_sensitive=meta["sensitive"],
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)
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)
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await db.commit()
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logger.info("已初始化默认配置项: %d 条", len(EDITABLE_SETTINGS))
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async def _get_raw_setting(db: AsyncSession, key: str) -> AppSetting | None:
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"""Get setting row from DB."""
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result = await db.execute(select(AppSetting).where(AppSetting.key == key))
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return result.scalar_one_or_none()
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async def get_setting(db: AsyncSession, key: str, default: Any = None) -> Any:
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"""Get decrypted setting value from DB or env default."""
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setting = await _get_raw_setting(db, key)
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if setting:
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return _decrypt(setting.value) if setting.is_sensitive else setting.value
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return _get_env_default(key) if default is None else default
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async def set_setting(db: AsyncSession, key: str, value: str) -> bool:
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"""Update a setting (encrypt sensitive values)."""
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if key not in EDITABLE_SETTINGS:
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return False
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meta = EDITABLE_SETTINGS[key]
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stored_value = _encrypt(str(value)) if meta["sensitive"] else str(value)
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setting = await _get_raw_setting(db, key)
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if setting:
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setting.value = stored_value
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else:
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setting = AppSetting(
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key=key,
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value=stored_value,
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description=meta["description"],
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is_sensitive=meta["sensitive"],
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)
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db.add(setting)
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await db.commit()
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logger.info("配置已更新: %s", key)
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return True
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async def list_settings(db: AsyncSession, mask_sensitive: bool = True) -> list[dict[str, Any]]:
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"""List all settings."""
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result = await db.execute(select(AppSetting))
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db_settings = {s.key: s for s in result.scalars().all()}
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output = []
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for key, meta in EDITABLE_SETTINGS.items():
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setting = db_settings.get(key)
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is_sensitive = meta["sensitive"]
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if setting:
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raw_value = setting.value
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updated_at = setting.updated_at.isoformat() if setting.updated_at else None
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else:
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raw_value = _get_env_default(key)
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updated_at = None
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decrypted_value = _decrypt(raw_value) if is_sensitive else raw_value
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if is_sensitive and mask_sensitive:
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display_value = _mask_sensitive(decrypted_value)
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is_masked = True
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else:
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display_value = decrypted_value
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is_masked = False
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output.append({
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"key": key,
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"value": display_value,
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"real_value": decrypted_value if not mask_sensitive else None,
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"description": meta["description"],
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"is_sensitive": is_sensitive,
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"is_masked": is_masked,
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"updated_at": updated_at,
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})
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return output
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async def apply_db_settings_to_config(db: AsyncSession) -> None:
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"""Apply DB settings to runtime config."""
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for key in EDITABLE_SETTINGS:
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db_value = await get_setting(db, key)
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if db_value is None or db_value == "":
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continue
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field_info = settings.model_fields.get(key)
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if field_info is None:
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continue
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target_type = field_info.annotation
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try:
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if target_type is int:
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converted = int(db_value)
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elif target_type is float:
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converted = float(db_value)
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elif target_type is bool:
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converted = db_value.lower() in ("true", "1", "yes")
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else:
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converted = db_value
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setattr(settings, key, converted)
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except Exception as exc:
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logger.error("应用配置 %s=%s 失败: %s", key, db_value, exc)
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raise ValueError(f"配置项 {key} 的值无效: {db_value}") from exc
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async def reset_settings(db: AsyncSession) -> None:
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"""Reset all settings to env defaults."""
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for key in EDITABLE_SETTINGS:
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await set_setting(db, key, _get_env_default(key))
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logger.info("配置已重置为环境变量默认值")
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