jwt認證

jwt工做原理

　　1) jwt = base64(頭部).base(載荷).hash256(base64(頭部).base(載荷).密鑰)

　　2) base64是可逆的算法、hash256是不可逆的算法

　　3) 密鑰是固定的字符串，保存在服務器


drf-jwt

官網連接：http://getblimp.github.io/django-rest-framework-jwt/

安裝子虛擬環境：pip install djangorestframework-jwt

使用：user/urls.py

from django.urls import path
from rest_framework_jwt.views import obtain_jwt_token
urlpatterns = [
    path('login/', obtain_jwt_token),
]

 測試接口：post請求

"""
postman發生post請求
接口：http://api.luffy.cn:8000/user/login/

數據：
{
    "username":"admin",
    "password":"admin"
}
"""

三、drf-jwt開發

配置信息：JWT_AUTH到dev.py中

import datetime
JWT_AUTH = {
    # 過時時間
    'JWT_EXPIRATION_DELTA': datetime.timedelta(days=1),
    # 自定義認證結果：見下方序列化user和自定義response
    'JWT_RESPONSE_PAYLOAD_HANDLER': 'user.utils.jwt_response_payload_handler',  
}

 序列化user：user/serializers.py(要本身建立)

from rest_framework import serializers
from . import models
class UserModelSerializers(serializers.ModelSerializer):
    class Meta:
        model = models.User
        fields = ['username']

自定義response：user/utils.py

from .serializers import UserModelSerializers
def jwt_response_payload_handler(token, user=None, request=None):
    return {
        'status': 0,
        'msg': 'ok',
        'data': {
            'token': token,
            'user': UserModelSerializers(user).data
        }
    }

基於drf-jwt的全局認證：user/authentications.py(本身建立)

import jwt
from rest_framework.exceptions import AuthenticationFailed
from rest_framework_jwt.authentication import jwt_decode_handler
from rest_framework_jwt.authentication import get_authorization_header
from rest_framework_jwt.authentication import BaseJSONWebTokenAuthentication

class JSONWebTokenAuthentication(BaseJSONWebTokenAuthentication):
    def authenticate(self, request):
        jwt_value = get_authorization_header(request)

        if not jwt_value:
            raise AuthenticationFailed('Authorization 字段是必須的')
        try:
            payload = jwt_decode_handler(jwt_value)
        except jwt.ExpiredSignature:
            raise AuthenticationFailed('簽名過時')
        except jwt.InvalidTokenError:
            raise AuthenticationFailed('非法用戶')
        user = self.authenticate_credentials(payload)

        return user, jwt_value

 全局啓用：settings/dev.py

REST_FRAMEWORK = {
    # 認證模塊
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'user.authentications.JSONWebTokenAuthentication',
    ),
}

 局部啓用禁用：任何一個cbv類首行

# 局部禁用
authentication_classes = []

# 局部啓用
from user.authentications import JSONWebTokenAuthentication
authentication_classes = [JSONWebTokenAuthentication]

 多方式登陸：user/utils.py

import re
from .models import User
from django.contrib.auth.backends import ModelBackend
class JWTModelBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        try:
            if re.match(r'^1[3-9]\d{9}$', username):
                user = User.objects.get(mobile=username)
            else:
                user = User.objects.get(username=username)
        except User.DoesNotExist:
            return None
        if user.check_password(password) and self.user_can_authenticate(user):
            return user

 配置多方式登陸：settings/dev.py

AUTHENTICATION_BACKENDS = ['user.utils.JWTModelBackend']

 手動簽發JWT：瞭解 - 能夠擁有原生登陸基於Model類user對象簽發JWT

from rest_framework_jwt.settings import api_settings

jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

payload = jwt_payload_handler(user)
token = jwt_encode_handler(payload)