Day 87 - jwt

main.py

from fastapi import FastAPI, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, EmailStr
from datetime import datetime, timedelta
from jose import JWTError, jwt
from passlib.context import CryptContext
 
# JWT 설정
SECRET_KEY = "your-secret-key"  # 실제 환경에서는 안전한 방식으로 관리해야 합니다
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30
 
app = FastAPI()
 
# 비밀번호 암호화 설정
# 아래 코드는 비밀번호를 해싱하는 방법을 정의합니다.
# pwd_context는 비밀번호를 검증하고 해싱하는 데 사용됩니다.
pwd_context = CryptContext(schemes=["pbkdf2_sha256"], deprecated="auto")
# OAuth2 설정
# OAuth2PasswordBearer는 토큰을 받아서 사용자를 인증하는 방법을 정의합니다.
# 아래 코드는 OAuth2PasswordBearer를 사용하여 토큰을 받아서 사용자를 인증합니다.
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")
 
fake_users_db = {}
 
 
class UserCreate(BaseModel):
    username: str
    email: EmailStr | None = None
    full_name: str | None = None
    password: str
 
 
class User(BaseModel):
    username: str
    email: EmailStr | None = None
    full_name: str | None = None
 
 
class UserInDB(User):
    hashed_password: str
 
 
class Token(BaseModel):
    access_token: str
    token_type: str
 
 
class TokenData(BaseModel):
    username: str | None = None
 
 
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)
 
 
def get_user(db, username: str):
    if username in db:
        user_dict = db[username]
        return UserInDB(**user_dict)
 
 
def authenticate_user(fake_db, username: str, password: str):
    user = get_user(fake_db, username)
    if not user:
        return False
    if not verify_password(password, user.hashed_password):
        return False
    return user
 
 
def create_access_token(data: dict, expires_delta: timedelta | None = None):
    to_encode = data.copy()
    expire = datetime.utcnow() + (expires_delta or timedelta(minutes=15))
    to_encode.update({"exp": expire})
    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
 
 
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, SECRET_KEY, algorithms=[ALGORITHM])
        username: str = payload.get("sub")
        if username is None:
            raise credentials_exception
        token_data = TokenData(username=username)
    except JWTError:
        raise credentials_exception
    user = get_user(fake_users_db, username=token_data.username)
    if user is None:
        raise credentials_exception
    return user
 
 
@app.post("/token", response_model=Token)
async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
    user = authenticate_user(fake_users_db, form_data.username, form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": user.username}, expires_delta=access_token_expires
    )
    return {"access_token": access_token, "token_type": "bearer"}
 
 
@app.get("/users/me/", response_model=User)
async def read_users_me(current_user: User = Depends(get_current_user)):
    return current_user
 
 
@app.post("/users/", response_model=User)
async def create_user(user: UserCreate):
    if user.username in fake_users_db:
        raise HTTPException(status_code=400, detail="Username already registered")
    hashed_password = get_password_hash(user.password)
    user_dict = user.model_dump()
    del user_dict["password"]
    user_dict["hashed_password"] = hashed_password
    fake_users_db[user.username] = user_dict
    return User(**user_dict)
 
@app.get("/")
async def read_db():
    return fake_users_db

from datetime import datetime, timedelta

import fastapi
from fastapi import HTTPException
from jose import jwt
from starlette.requests import Request

app=fastapi.FastAPI()

dummy_data=[]

@app.get('/')
def index():
    return {}
@app.get('/join')
def join(id:str,pw:str):
    dummy_data.append({'id':id,'pw':pw})
    return {'id':id,'pw':pw}
@app.get('/login')
def login(id:str,pw:str):
    token=None
    for row in dummy_data:
        if row.get('id')==id and row.get('pw')==pw:
            expire = datetime.utcnow() + timedelta(minutes=1)
            token = jwt.encode({'sub': id,"exp": expire}, 'secret', algorithm='HS256')
    return {'token':token}
@app.get('/info')
def index(req:Request):
    if req.headers.get('authorization') is not None:
        auth=req.headers.get('authorization')
        if auth.startswith('Bearer '):
            token=auth.split(" ")[1]
            PAYLOAD=jwt.decode(token, 'secret', algorithms=['HS256'])
            # time=PAYLOAD.get('exp')
            # exp=datetime.fromtimestamp(time)
            # if exp>=datetime.utcnow():
            for row in dummy_data:
                if row.get('id')==PAYLOAD.get('sub'):
                    return {'payload':PAYLOAD}
            raise HTTPException(403, '존재하지 않는 사용자')
            # else :
            #     raise HTTPException(403, '타임아웃')
        else:
            raise HTTPException(403, '토큰 오류')
    else:
        raise HTTPException(403,'불허')