直接上代码，早上会加点解释说明。

目录结构如下：

image.png

入口函数

# -*- coding: UTF-8 -*-
from fastapi import FastAPI, HTTPException, Depends
from fastapi.security import OAuth2PasswordBearer
from datamodel import User

from jiami import mytools

app = FastAPI()

_user = User(**{
    'username': 'test',
    'password': 'test'
})

# 通过token进行鉴权认证
@app.get('/add')
def add(a: int, b: int, user: User = Depends(mytools.get_user)):
    return {'c': a + b}


@app.post('/login')
def login(user: User):
    print(user)
    if user == _user or user.username == '-1':
        return {'token': mytools.create_token(user.username)}
    raise HTTPException(status_code=403, detail='access denied')
    return {'msg': 'hello world'}

工具类 jiami.mytools

# -*- coding: UTF-8 -*-
from datetime import datetime
from datetime import timedelta
from jose import jwt
from fastapi import HTTPException, Depends
from fastapi.security import OAuth2PasswordBearer

KEY = "KSDHDBQWUHDWBXUBCAUBSU@3#$@(*COszcasawdwada"

TOKEN_EXPIRED = 60 * 60 * 24 * 7  # 一周有效期

#通过jwt生成token  第三方包 python-jose
def create_token(username: str):
    data = {
        'username': username,
        'exp': datetime.utcnow() + timedelta(seconds=TOKEN_EXPIRED)
    }
    token = jwt.encode(data, KEY, algorithm='HS256')
    return token

#鉴权接口
def get_user(token: str = Depends(OAuth2PasswordBearer(tokenUrl='/login'))):
    try:
        token_plain = jwt.decode(token, KEY, algorithms='HS256')
        username = token_plain.get('username', "-1")
        print(username)
    except Exception as e:
        raise HTTPException(status_code=403, detail="access denied")
    if username == '-1':
        raise HTTPException(status_code=400, detail="user access denied")
    else:
        return username

工具类 datamodel

# -*- coding: UTF-8 -*-
from pydantic import BaseModel, Depen


class User(BaseModel):
    username: str
    password: str

    def __eq__(self, other):
        if self.username == other.username and self.password == other.password:
            return True
        else:
            return False

运行命令如下：

# 其中myapi为主函数文件名
uvicorn myapi:app --reload