129 lines
3.8 KiB
Python
129 lines
3.8 KiB
Python
from datetime import datetime, timedelta
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from typing import Optional
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from fastapi import APIRouter, Depends, HTTPException, 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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router = APIRouter()
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# Constants
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SECRET_KEY = "your-secret-key-here"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 30
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# Password hashing
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")
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# Models
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class User(BaseModel):
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username: str
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email: str
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full_name: Optional[str] = None
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disabled: Optional[bool] = False
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class UserInDB(User):
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hashed_password: str
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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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# 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 get_user(username: str):
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if username in fake_users_db:
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user_dict = fake_users_db[username]
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return UserInDB(**user_dict)
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return None
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def authenticate_user(username: str, password: str):
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user = get_user(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: 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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async def get_current_user(token: str = Depends(oauth2_scheme)):
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credentials_exception = HTTPException(
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status_code=401,
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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 = get_user(username=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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# Login endpoint
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@router.post("/login", response_model=Token)
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async def login(response: Response, form_data: OAuth2PasswordRequestForm = Depends()):
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"""Authenticate user and return JWT 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=401,
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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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# Set cookie
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response.set_cookie(
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key="access_token",
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value=f"Bearer {access_token}",
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httponly=True,
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max_age=1800,
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expires=1800,
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secure=True,
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samesite="lax"
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)
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return {
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"access_token": access_token,
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"token_type": "bearer",
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"message": "Login successful",
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"user": {
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"username": user.username,
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"email": user.email,
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"full_name": user.full_name
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}
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}
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# Protected route example
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@router.get("/me", response_model=User)
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async def read_users_me(current_user: User = Depends(get_current_user)):
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"""Get current user information"""
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return current_user |