init

app/auth/dependencies.py

@@ -0,0 +1,36 @@
+import uuid
+
+import jwt
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlmodel import Session, select
+
+from app.database import get_session
+from app.models.user import User
+from app.auth.jwt import decode_token
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/login")
+
+
+async def get_current_user(
+    token: str = Depends(oauth2_scheme),
+    session: Session = Depends(get_session),
+) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = decode_token(token)
+        user_id_str: str | None = payload.get("sub")
+        if user_id_str is None:
+            raise credentials_exception
+        user_id = uuid.UUID(user_id_str)
+    except (jwt.PyJWTError, ValueError):
+        raise credentials_exception
+
+    user = session.get(User, user_id)
+    if user is None:
+        raise credentials_exception
+    return user

app/auth/jwt.py

@@ -0,0 +1,43 @@
+from datetime import datetime, timedelta, timezone
+
+import jwt
+from pwdlib import PasswordHash
+
+from app.config import (
+    SECRET_KEY,
+    ALGORITHM,
+    ACCESS_TOKEN_EXPIRE_MINUTES,
+    REFRESH_TOKEN_EXPIRE_DAYS,
+)
+
+password_hash = PasswordHash.recommended()
+
+
+def hash_password(password: str) -> str:
+    return password_hash.hash(password)
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return password_hash.verify(plain, hashed)
+
+
+def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + (
+        expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    )
+    to_encode["exp"] = expire
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def create_refresh_token(data: dict) -> str:
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + timedelta(days=REFRESH_TOKEN_EXPIRE_DAYS)
+    to_encode["exp"] = expire
+    to_encode["type"] = "refresh"
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+
+def decode_token(token: str) -> dict:
+    """Decode and verify a JWT token. Raises jwt.PyJWTError on failure."""
+    return jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])