Initial commit

auth.py

@@ -0,0 +1,111 @@
+from datetime import datetime, timedelta
+
+from fastapi import HTTPException, Depends, Request, status
+from fastapi.openapi.models import OAuthFlows
+from fastapi.security import OAuth2, OAuth2PasswordRequestForm
+from fastapi.security.utils import get_authorization_scheme_param
+from jose import jwt, JWTError
+from typing import Optional
+from passlib.context import CryptContext
+from schemas.user_schemas import UserInfo, UserDatabase
+from db.models.user import User
+from tortoise.exceptions import DoesNotExist
+from schemas.token_schemas import TokenData
+
+SECRET_KEY = "test"  # TODO: Ну типа да
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 30  # TODO: Конфиг
+
+
+pass_context = CryptContext(schemes=["bcrypt"])
+
+
+class OAuth2PasswordBearerCookie(OAuth2):
+    def __init__(self, token_url: str, scheme_name: str = None, scopes: dict = None, auto_error: bool = True):
+        if not scopes:
+            scopes = {}
+        flows = OAuthFlows(password={"tokenUrl": token_url, "scopes": scopes})
+        super().__init__(flows=flows, scheme_name=scheme_name, auto_error=auto_error)
+
+    async def __call__(self, request: Request) -> Optional[str]:
+        authorization: str = request.cookies.get("Authorization")
+        scheme, param = get_authorization_scheme_param(authorization)
+
+        if not authorization or scheme.lower() != "bearer":
+            if self.auto_error:
+                raise HTTPException(
+                    status_code=401,
+                    detail="Not authenticated",
+                    headers={"WWW-Authenticate": "Bearer"},
+                )
+            else:
+                return None
+        return param
+
+
+security = OAuth2PasswordBearerCookie(token_url="/login")
+
+
+async def get_current_user(token: str = Depends(security)):
+    credentials_exception = HTTPException(
+        status_code=401,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        username: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+        token_data = TokenData(username=username)
+    except JWTError:
+        raise credentials_exception
+
+    try:
+        user = await UserInfo.from_queryset_single(
+            User.get(username=token_data.username)
+        )
+    except DoesNotExist:
+        raise credentials_exception
+
+    return user
+
+
+async def get_user(username: str):
+    return await UserDatabase.from_queryset_single(User.get(username=username))
+
+
+def verify_password(plain_password, hashed_password):
+    return pass_context.verify(plain_password, hashed_password)
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=15)
+
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+
+    return encoded_jwt
+
+
+async def validate_user(user: OAuth2PasswordRequestForm = Depends()):
+    try:
+        db_user = await get_user(user.username)
+    except DoesNotExist:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+        )
+
+    if not verify_password(user.password, db_user.password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+        )
+
+    return db_user