Started implementing auth

routers/auth.py

@@ -0,0 +1,126 @@
+import os
+
+from fastapi import APIRouter, Depends, HTTPException, status, Response
+from database import db_dependency
+from jose import JWTError, jwt
+from datetime import datetime, timedelta, timezone
+import models
+
+import schemas.users as user_schemas
+import routers.users as user_router
+
+from pyargon2 import hash
+
+router = APIRouter(prefix="/auth", tags=["auth"])
+
+SECRET_KEY = os.getenv("SECRET_KEY", "your-secret-key-change-this-in-production")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 1440  # 24 hours
+
+def create_access_token(data: dict, expires_delta: timedelta | None = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.now(timezone.utc) + expires_delta
+    else:
+        expire = datetime.now(timezone.utc) + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    to_encode.update({"exp": expire})
+    to_encode.update({"iat": datetime.now(timezone.utc)})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+@router.post("/login")
+def login(user_data: user_schemas.UserLogin, response: Response, db: db_dependency):
+    """Login and receive JWT token in cookie"""
+    db_user = db.query(models.User).filter(models.User.email == user_data.email).first()
+    if db_user is None:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password"
+        )
+    
+    if not verify_user_password(getattr(db_user, "id"), user_data.password, db):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password"
+        )
+    
+    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        data={"sub": str(db_user.id)}, expires_delta=access_token_expires
+    
+    )
+    
+    # Set JWT in httpOnly cookie
+    response.set_cookie(
+        key="access_token",
+        value=access_token,
+        httponly=True,
+        max_age=ACCESS_TOKEN_EXPIRE_MINUTES * 60,
+        samesite="lax",
+        secure=False  # Set to True in production with HTTPS
+    )
+    
+    return {
+        "message": "Login successful",
+        "user": {
+            "id": db_user.id,
+            "name": db_user.name,
+            "email": db_user.email
+        }
+    }
+
+@router.post("/logout")
+def logout(response: Response):
+    """Logout by clearing the JWT cookie"""
+    response.delete_cookie(key="access_token")
+    return {"message": "Logout successful"}
+
+def verify_jwt_token(token: str):
+    """Verify and decode a JWT token"""
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id = payload.get("sub")
+        if user_id is None:
+            raise credentials_exception
+        return user_id
+    except JWTError:
+        raise credentials_exception
+
+def get_current_user(request, db: db_dependency):
+    """Get current authenticated user from cookie"""
+    token = request.cookies.get("access_token")
+    
+    if not token:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Not authenticated"
+        )
+    
+    user_id = verify_jwt_token(token)
+    user = db.query(models.User).filter(models.User.id == int(user_id)).first()
+    
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="User not found"
+        )
+    
+    return user
+
+
+def verify_user_password(user_id: int, password: str, db: db_dependency) -> bool:
+    """Verify user's password"""
+    db_user = db.query(models.User).filter(models.User.id == user_id).first()
+    if db_user is None:
+        return False
+    
+    hashed_password = hash(password=password, salt=str(getattr(db_user,"password_salt")), variant="id")
+    if hashed_password != db_user.password_hash:
+        return False
+
+    return True