169 lines
5.0 KiB
Python
169 lines
5.0 KiB
Python
from datetime import datetime, timedelta, timezone
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from typing import Annotated
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from fastapi import Depends, APIRouter, HTTPException, Security, status
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from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm, SecurityScopes
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from pydantic import BaseModel, ValidationError
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import os
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#from app.secrets import SECRET_KEY, fake_users_db
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# to get a string like this run:
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# openssl rand -hex 32
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 * 31
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SECRET_KEY = os.environ['SECRET_KEY']
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fake_users_db = {
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"admin": {
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"username": "admin",
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"email": "admin@example.com",
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"hashed_password": os.environ["ADMIN_PWD"],
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"disabled": False,
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"scopes" : ["admin", "public"]
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}
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}
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class Token(BaseModel):
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access_token: str
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token_type: str
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class TokenData(BaseModel):
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username: str | None = None
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scopes: list[str] = []
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class User(BaseModel):
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username: str
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email: str | None = None
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#full_name: str | None = None
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disabled: bool | None = None
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class UserInDB(User):
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hashed_password: str
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scopes: list[str] = []
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(
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tokenUrl="user/token",
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scopes={
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"admin": "Perform admin actions.",
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"public": "Perform public actions."
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}
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)
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router = APIRouter(
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prefix="/user"
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)
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def verify_password(plain_password, hashed_password):
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print(get_password_hash(plain_password))
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password):
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return pwd_context.hash(password)
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def get_user(db, username: str):
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if username in db:
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user_dict = db[username]
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return UserInDB(**user_dict)
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def authenticate_user(fake_db, username: str, password: str):
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user = get_user(fake_db, username)
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if not user:
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return False
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if not verify_password(password, user.hashed_password):
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return False
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return user
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def create_access_token(data: dict, expires_delta: timedelta | None = None):
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.now(timezone.utc) + expires_delta
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else:
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expire = datetime.now(timezone.utc) + timedelta(minutes=15)
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to_encode.update({"exp": expire})
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encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded_jwt
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async def get_current_user(
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security_scopes: SecurityScopes, token: Annotated[str, Depends(oauth2_scheme)]
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):
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if security_scopes.scopes:
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authenticate_value = f'Bearer scope="{security_scopes.scope_str}"'
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else:
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authenticate_value = "Bearer"
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": authenticate_value},
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)
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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username: str = payload.get("sub") # type: ignore
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if username is None:
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raise credentials_exception
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token_scopes = payload.get("scopes", [])
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token_data = TokenData(scopes=token_scopes, username=username)
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except (JWTError, ValidationError):
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raise credentials_exception
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user = get_user(fake_users_db, username=token_data.username or "")
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if user is None:
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raise credentials_exception
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for scope in security_scopes.scopes:
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if scope not in token_data.scopes:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Not enough permissions",
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headers={"WWW-Authenticate": authenticate_value},
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)
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return user
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async def get_current_active_user(
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current_user: Annotated[User, Security(get_current_user, scopes=["me"])],
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):
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if current_user.disabled:
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raise HTTPException(status_code=400, detail="Inactive user")
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return current_user
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@router.post("/token")
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async def login_for_access_token(
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form_data: Annotated[OAuth2PasswordRequestForm, Depends()],
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) -> Token:
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user = authenticate_user(
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fake_users_db, form_data.username, form_data.password)
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if not user:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Incorrect username or password",
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headers={"WWW-Authenticate": "Bearer"},
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)
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access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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access_token = create_access_token(
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data={"sub": user.username, "scopes": user.scopes}, expires_delta=access_token_expires
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)
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return Token(access_token=access_token, token_type="bearer")
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# @router.get("/public_token")
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# async def get_public_access_token(secret_identity : str) -> Token:
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# access_token_expires = timedelta(minutes=60*24*365)
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# access_token = create_access_token(
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# data={"sub": "public", "secret_identity" : secret_identity, "scopes": ["public"]}, expires_delta=access_token_expires
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# )
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# return Token(access_token=access_token, token_type="bearer") |