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main.py
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main.py
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import jwt
from fastapi import FastAPI, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from passlib.hash import bcrypt
from tortoise import fields
from tortoise.models import Model
from tortoise.contrib.fastapi import register_tortoise
from tortoise.contrib.pydantic import pydantic_model_creator
app = FastAPI()
JWT_SECRET = 'MyJWTSecret'
class User(Model):
id = fields.IntField(pk=True)
username = fields.CharField(50, unique=True)
password_hash = fields.CharField(128)
def verify_password(self, password):
return bcrypt.verify(password, self.password_hash)
User_Pydantic = pydantic_model_creator(User, name='User')
UserIn_Pydantic = pydantic_model_creator(
User,
name='UserIn',
exclude_readonly=True
)
oauth2_scheme = OAuth2PasswordBearer(tokenUrl='token')
async def authenticate_user(username: str, password: str):
user = await User.get(username=username)
if not user:
return False
if not user.verify_password(password):
return False
return user
@app.post('/token')
async def generate_token(form_data: OAuth2PasswordRequestForm = Depends()):
user = await authenticate_user(form_data.username, form_data.password)
if not user:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail='Invalid username or password'
)
user_obj = await User_Pydantic.from_tortoise_orm(user)
token = jwt.encode(user_obj.dict(), JWT_SECRET)
return {'access_token': token, 'token_type': 'bearer' }
async def get_user_current(token: str = Depends(oauth2_scheme)):
try:
payload = jwt.decode(token, JWT_SECRET, algorithms=['HS256'])
user = await User.get(id=payload.get('id'))
except:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail='Invalid username or password'
)
return await User_Pydantic.from_tortoise_orm(user)
@app.post('/users', response_model=User_Pydantic)
async def create_user(user: UserIn_Pydantic):
user_obj = User(
username=user.username,
password_hash=bcrypt.hash(user.password_hash)
)
await user_obj.save()
return await User_Pydantic.from_tortoise_orm(user_obj)
@app.get('/users/me', response_model=User_Pydantic)
async def get_user(user: User_Pydantic = Depends(get_user_current)):
return user
register_tortoise(
app,
db_url='sqlite://db.sqlite3',
modules={'models': ['main']},
generate_schemas=True,
add_exception_handlers=True
)