structure auth

server/src/app/auth/dependancies.py

@@ -0,0 +1,48 @@
+from src.app.config import settings
+
+from typing import Annotated
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from argon2 import PasswordHasher
+from argon2 import PasswordHasher
+import jwt
+from jwt.exceptions import InvalidTokenError
+
+from src.app.models.user import User
+from src.app.data.user import get_user
+from .schemas import TokenData
+from .security import verify_password
+
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/token")
+password_hasher = PasswordHasher()
+
+def authenticate_user(username: str, password: str):
+    user: User = get_user(username)
+    if not user:
+        # Add timing to prevent attack
+        password_hasher.hash(password)
+        return False
+    if not verify_password(password, user.hashed_password):
+        return False
+    return user
+
+async def get_current_user(token: Annotated[str, Depends(oauth2_scheme)]) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try: 
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+        username = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+        token_data = TokenData(username=username)
+    except InvalidTokenError:
+        raise credentials_exception
+    user = get_user(username=token_data.username)
+    if user is None:
+        raise credentials_exception
+    return user
+
+

server/src/app/auth/schemas.py

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+from pydantic import BaseModel
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+class TokenData(BaseModel):
+    username: str | None = None

server/src/app/auth/security.py

@@ -0,0 +1,33 @@
+from src.app.config import settings
+from datetime import timedelta, datetime, timezone
+from argon2 import PasswordHasher
+from argon2.exceptions import (
+    VerifyMismatchError,
+    VerificationError,
+    InvalidHashError,
+)
+import jwt
+from jwt.exceptions import InvalidTokenError
+
+
+password_hasher = PasswordHasher()
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    try:
+        return password_hasher.verify(hashed_password, plain_password)
+    except (VerifyMismatchError, VerificationError, InvalidHashError):
+        return False
+    
+def hash_password(password: str) -> str:
+    return password_hasher.hash(password)
+
+def create_access_token(data: dict):
+        expire = datetime.now(timezone.utc) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+        to_encode = data.copy()
+        to_encode.update({"exp": expire})
+        encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+        return encoded_jwt
+
+#def create_refresh_token(data: dict) -> str:
+
+#def verify_token(token: str, token_type: str = "access") -> Optional[dict]: