How can I implement asynchronous authentication in FastAPI?

How can I implement asynchronous authentication in FastAPI?

You can use FastAPI's built-in support for asynchronous programming along with libraries like OAuth2 and JWT for authentication.

Can you provide a code example for using JWT with FastAPI?

Sure! Here's a simple example:

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from jose import JWTError, jwt
from datetime import datetime, timedelta

app = FastAPI()

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Your secret key and algorithm
SECRET_KEY = "your_secret_key"
ALGORITHM = "HS256"

# Function to create a JWT token
def create_access_token(data: dict, expires_delta: 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

# Example route to get a token
@app.post("/token")
async def login(form_data: OAuth2PasswordRequestForm = Depends()):
    # Validate user credentials here
    access_token = create_access_token(data={"sub": form_data.username})
    return {"access_token": access_token, "token_type": "bearer"}

This code sets up a basic token endpoint.

What libraries do I need to install for this?

You will need to install FastAPI, uvicorn, and python-jose. You can do this using pip:

pip install fastapi uvicorn python-jose