Initial commit

2022-02-27 21:23:57 +01:00
commit 1805d6fe98
46 changed files with 4453 additions and 0 deletions
@@ -0,0 +1,147 @@
+from classquiz.config import settings
+from classquiz.db.models import *
+from typing import Union
+from jose import JWTError, jwt
+from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
+from passlib.context import CryptContext
+from datetime import datetime, timedelta
+from classquiz.cache import get_cache
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2
+from fastapi.openapi.models import OAuthFlows as OAuthFlowsModel
+from fastapi import Request
+from fastapi.security.utils import get_authorization_scheme_param
+from fastapi import HTTPException
+from fastapi import status
+from typing import Optional
+from typing import Dict
+from starlette.status import HTTP_401_UNAUTHORIZED
+import pydantic
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = settings.access_token_expire_minutes
+
+
+class OAuth2PasswordBearerWithCookie(OAuth2):
+    def __init__(
+            self,
+            tokenUrl: str,
+            scheme_name: Optional[str] = None,
+            scopes: Optional[Dict[str, str]] = None,
+            auto_error: bool = True,
+    ):
+        if not scopes:
+            scopes = {}
+        flows = OAuthFlowsModel(password={"tokenUrl": tokenUrl, "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("access_token")  # changed to accept access token from httpOnly Cookie
+
+        scheme, param = get_authorization_scheme_param(authorization)
+        if not authorization or scheme.lower() != "bearer":
+            if self.auto_error:
+                raise HTTPException(
+                    status_code=status.HTTP_401_UNAUTHORIZED,
+                    detail="Not authenticated",
+                    headers={"WWW-Authenticate": "Bearer"},
+                )
+            else:
+                return None
+        return param
+
+
+oauth2_scheme = OAuth2PasswordBearerWithCookie(tokenUrl="/api/v1/users/token/cookie")
+
+
+def verify_password(plain_password, hashed_password):
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password):
+    return pwd_context.hash(password)
+
+
+async def get_user_from_mail(email: str) -> Union[User, None]:
+    return await get_cache(criteria="email", content=email)
+
+
+async def get_user_from_username(username: str) -> Union[User, None]:
+    return await get_cache(criteria="username", content=username)
+
+
+async def get_user_from_id(id: str) -> Union[User, None]:
+    return await get_cache(criteria="id", content=id)
+
+
+async def authenticate_user(email: str, password: str) -> Union[User, bool]:
+    user = await get_user_from_mail(email)
+    if not user:
+        return False
+    if not verify_password(password, user.password):
+        return False
+    return user
+
+
+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, settings.secret_key, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+async def get_current_user(token: str = Depends(oauth2_scheme)):
+    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, algorithms=[ALGORITHM])
+        email: str = payload.get("sub")
+        if email is None:
+            raise credentials_exception
+        token_data = TokenData(email=email)
+    except JWTError:
+        raise credentials_exception
+    user = await get_user_from_mail(email=token_data.email)
+    if user is None:
+        raise credentials_exception
+    return user
+
+
+async def get_current_user_optional(token: str = Depends(oauth2_scheme)) -> User | None:
+    try:
+        payload = jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])
+        email: str = payload.get("sub")
+        if email is None:
+            return None
+        token_data = TokenData(email=email)
+    except JWTError:
+        return None
+    user = await get_user_from_mail(email=token_data.email)
+    if user is None:
+        return None
+    return user
+
+
+async def check_token(token: str = Depends(oauth2_scheme)):
+    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, algorithms=[ALGORITHM])
+        email: str = payload.get("sub")
+        if email is None:
+            raise credentials_exception
+        token_data = TokenData(email=email)
+    except JWTError:
+        raise credentials_exception
+    return token_data.email