tests passing

backend/auth.py

@@ -0,0 +1,100 @@
+import os
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+import bcrypt
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from jose import JWTError, jwt
+from pydantic import BaseModel, EmailStr
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from database import get_db
+from models import User
+
+SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-key-change-in-production")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 7  # 7 days
+security = HTTPBearer()
+
+
+class UserCreate(BaseModel):
+    email: EmailStr
+    password: str
+
+
+class UserLogin(BaseModel):
+    email: EmailStr
+    password: str
+
+
+class UserResponse(BaseModel):
+    id: int
+    email: str
+
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str
+    user: UserResponse
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return bcrypt.checkpw(
+        plain_password.encode("utf-8"),
+        hashed_password.encode("utf-8"),
+    )
+
+
+def get_password_hash(password: str) -> str:
+    return bcrypt.hashpw(
+        password.encode("utf-8"),
+        bcrypt.gensalt(),
+    ).decode("utf-8")
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    to_encode = data.copy()
+    expire = datetime.now(timezone.utc) + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
+    to_encode.update({"exp": expire})
+    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+
+async def get_user_by_email(db: AsyncSession, email: str) -> Optional[User]:
+    result = await db.execute(select(User).where(User.email == email))
+    return result.scalar_one_or_none()
+
+
+async def authenticate_user(db: AsyncSession, email: str, password: str) -> Optional[User]:
+    user = await get_user_by_email(db, email)
+    if not user or not verify_password(password, user.hashed_password):
+        return None
+    return user
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: AsyncSession = Depends(get_db),
+) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Invalid authentication credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        token = credentials.credentials
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id_str = payload.get("sub")
+        if user_id_str is None:
+            raise credentials_exception
+        user_id = int(user_id_str)
+    except (JWTError, ValueError):
+        raise credentials_exception
+
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+    if user is None:
+        raise credentials_exception
+    return user
+