counterweight
6c218130e9
- Add ruff as dev dependency - Configure ruff in pyproject.toml with strict 88-char line limit - Ignore B008 (FastAPI Depends pattern is standard) - Allow longer lines in tests for readability - Fix all lint issues in source files - Add Makefile targets: lint-backend, format-backend, fix-backend
127 lines
3.8 KiB
Python
127 lines
3.8 KiB
Python
import os
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from datetime import UTC, datetime, timedelta
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import bcrypt
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from fastapi import Depends, HTTPException, Request, status
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from jose import JWTError, jwt
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from database import get_db
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from models import Permission, User
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from schemas import UserResponse
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SECRET_KEY = os.environ["SECRET_KEY"] # Required - see .env.example
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 7 # 7 days
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COOKIE_NAME = "auth_token"
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COOKIE_SECURE = os.environ.get("COOKIE_SECURE", "false").lower() == "true"
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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return bcrypt.checkpw(
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plain_password.encode("utf-8"),
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hashed_password.encode("utf-8"),
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)
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def get_password_hash(password: str) -> str:
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return bcrypt.hashpw(
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password.encode("utf-8"),
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bcrypt.gensalt(),
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).decode("utf-8")
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def create_access_token(
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data: dict[str, str],
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expires_delta: timedelta | None = None,
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) -> str:
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to_encode: dict[str, str | datetime] = dict(data)
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delta = expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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expire = datetime.now(UTC) + delta
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to_encode["exp"] = expire
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encoded: str = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded
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async def get_user_by_email(db: AsyncSession, email: str) -> User | None:
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result = await db.execute(select(User).where(User.email == email))
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return result.scalar_one_or_none()
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async def authenticate_user(db: AsyncSession, email: str, password: str) -> User | None:
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user = await get_user_by_email(db, email)
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if not user or not verify_password(password, user.hashed_password):
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return None
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return user
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async def get_current_user(
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request: Request,
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db: AsyncSession = Depends(get_db),
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) -> User:
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid authentication credentials",
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)
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token = request.cookies.get(COOKIE_NAME)
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if not token:
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raise credentials_exception
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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user_id_str = payload.get("sub")
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if user_id_str is None:
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raise credentials_exception
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user_id = int(user_id_str)
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except (JWTError, ValueError):
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raise credentials_exception from None
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result = await db.execute(select(User).where(User.id == user_id))
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user = result.scalar_one_or_none()
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if user is None:
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raise credentials_exception
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return user
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def require_permission(*required_permissions: Permission):
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"""
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Dependency factory that checks if user has ALL required permissions.
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Usage:
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@app.get("/api/counter")
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async def get_counter(
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user: User = Depends(require_permission(Permission.VIEW_COUNTER))
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):
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...
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"""
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async def permission_checker(
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request: Request,
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db: AsyncSession = Depends(get_db),
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) -> User:
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user = await get_current_user(request, db)
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user_permissions = await user.get_permissions(db)
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missing = [p for p in required_permissions if p not in user_permissions]
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if missing:
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missing_str = ", ".join(p.value for p in missing)
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail=f"Missing required permissions: {missing_str}",
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)
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return user
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return permission_checker
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async def build_user_response(user: User, db: AsyncSession) -> UserResponse:
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"""Build a UserResponse with roles and permissions."""
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permissions = await user.get_permissions(db)
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return UserResponse(
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id=user.id,
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email=user.email,
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roles=user.role_names,
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permissions=[p.value for p in permissions],
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)
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