115 lines
4.3 KiB
Python
115 lines
4.3 KiB
Python
from typing import Optional
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from datetime import datetime, timedelta
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from fastapi import APIRouter, Depends, HTTPException, status, Response
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from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
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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
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from core.database import fake_users_db
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# JWT and Password Hashing Setup
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SECRET_KEY = "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 30
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
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# JWT Helper Functions
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def verify_password(plain_password, hashed_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 authenticate_user(username: str, password: str):
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user = fake_users_db.get(username)
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if not user:
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return False
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if not verify_password(password, user["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: Optional[timedelta] = None):
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + 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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# Data Models
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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: Optional[str] = None
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# Router Setup
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router = APIRouter()
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# Login Endpoint
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@router.post("/token", response_model=Token)
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async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
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"""Login endpoint to get access token"""
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user = authenticate_user(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"]}, expires_delta=access_token_expires
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)
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response = {"access_token": access_token, "token_type": "bearer"}
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# Store token in cookie
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response = Response(**response)
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response.set_cookie(key="access_token", value=access_token, httponly=True)
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return response
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# Helper function to get current user from token
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async def get_current_user(token: str = Depends(oauth2_scheme)):
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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": "Bearer"},
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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")
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if username is None:
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raise credentials_exception
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token_data = TokenData(username=username)
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except JWTError:
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raise credentials_exception
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user = fake_users_db.get(token_data.username)
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if user is None:
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raise credentials_exception
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return user
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# Authenticated user endpoint
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@router.get("/users/me/", response_model=dict)
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async def read_users_me(current_user: dict = Depends(get_current_user)):
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"""Fetch current authenticated user"""
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return {
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"message": "User found",
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"data": current_user
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}
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```
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This code provides the following functionality:
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1. **Login Endpoint**: `/token` endpoint to authenticate a user and return an access token. The token is stored in a browser cookie.
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2. **User Endpoint**: `/users/me` endpoint to fetch the current authenticated user's data using the access token.
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3. **JWT Implementation**: JSON Web Token (JWT) implementation for generating and verifying access tokens.
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4. **Password Hashing**: Password hashing and verification using the `passlib` library.
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5. **Helper Functions**: Functions for user authentication, password verification, token generation, and getting the current user from the token.
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6. **Data Models**: Pydantic models for Token and TokenData.
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Note: This code uses a fake user database (`fake_users_db`) for demonstration purposes. In a real application, you would replace it with an actual database implementation. |