python实现jwt（django，flask）_python jwt示例

本文分别基于python及其框架django和flask框架实例实现jwt

1.python实现jwt

• 安装

pip3 install pyjwt
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• 实现

import jwt
import datetime
from jwt import exceptions
SALT = 'iv%x6xo7l7_u9bf_u!9#g#m*)*=ej@bek5)(@u3kh*72+unjv='
def create_token():
    # 构造header
    headers = {
   
        'typ': 'jwt',
        'alg': 'HS256'
    }
    # 构造payload
    payload = {
   
        'user_id': 1, # 自定义用户ID
        'username': 'yhz', # 自定义用户名
        'exp': datetime.datetime.utcnow() + datetime.timedelta(minutes=5) # 超时时间
    }
    result = jwt.encode(payload=payload, key=SALT, algorithm="HS256", headers=headers).decode('utf-8')
    return result
if __name__ == '__main__':
    token = create_token()
    print(token)
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一般在认证成功后，把jwt生成的token返回给用户，以后用户再次访问时候需要携带token，此时jwt需要对token进行超时及合法性校验。

获取token之后，会按照以下步骤进行校验：

• 将token分割成 header_segment、payload_segment、crypto_segment 三部分

jwt_token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"
signing_input, crypto_segment = jwt_token.rsplit(b'.', 1)
header_segment, payload_segment = signing_input.split(b'.', 1)
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signing_input
Out[4]: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ'
In [5]: crypto_segment
Out[5]: 'SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c'

In [6]: header_segment
Out[6]: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9'

In [7]: payload_segment
Out
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