feat: initial commit

backend/app/utils/auth.py

@@ -0,0 +1,70 @@
+"""JWT authentication utilities."""
+import uuid
+from datetime import datetime, timedelta
+from typing import Optional
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+
+from app.config import settings
+from app.database import get_db
+from app.models.user import User
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+bearer_scheme = HTTPBearer()
+
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return pwd_context.verify(plain, hashed)
+
+
+def create_access_token(user_id: str, role: str) -> str:
+    expires = datetime.utcnow() + timedelta(minutes=settings.jwt_access_token_expire_minutes)
+    payload = {"sub": user_id, "role": role, "exp": expires}
+    return jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)
+
+
+def decode_token(token: str) -> dict:
+    try:
+        return jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
+    except JWTError as exc:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token") from exc
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(bearer_scheme),
+    db: AsyncSession = Depends(get_db),
+) -> User:
+    payload = decode_token(credentials.credentials)
+    user_id = payload.get("sub")
+    if not user_id:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
+
+    result = await db.execute(select(User).where(User.id == uuid.UUID(user_id)))
+    user = result.scalar_one_or_none()
+    if not user or not user.is_active:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="User not found or inactive")
+    return user
+
+
+async def require_admin(user: User = Depends(get_current_user)) -> User:
+    if user.role.value != "admin":
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Admin access required")
+    return user
+
+
+async def require_admin_or_pm(user: User = Depends(get_current_user)) -> User:
+    if user.role.value not in ("admin", "project_manager"):
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Admin or Project Manager access required",
+        )
+    return user