微信公众号-接口凭据

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access_token是公众号的全局唯一票据，公众号调用各接口时都需使用 access_token。开发者需要进行妥善保存。access_token 的存储至少要保留 512 个字符空间。access_token的有效期目前为 2 个小时，需定时刷新，重复获取将导致上次获取的 access_token 失效

原理：

对 https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET 发起 GET 请求

微信公众号 - 接口凭据

正确的返回值

{"access_token":"ACCESS_TOKEN",
    "expires_in":7200
}

微信公众号 - 接口凭据

错误的返回值

{"errcode":40013,
    "errmsg":"invalid appid"
}

DJango 服务代码实现

myApp/accessToken.py

import time
import requests
import json

class AccessToken:
    _access_token = {"token":"",
        "updatatime":time.time()}
    @classmethod
    def updateAccessToken(cls, grant_type, appid, secret):
        url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=%s&appid=%s&secret=%s"%(grant_type, appid, secret)
        res = requests.get(url)
        resDit = json.loads(res.content)
        if resDit["access_token"]:
            cls._access_token["token"] = resDit["access_token"]
            cls._access_token["updatatime"] = time.time()

    @classmethod
    def getAccessToken(cls, grant_type, appid, secret):
        if not cls._access_token["token"] or (time.time() - cls._access_token["updatatime"]) >= 6500:
            # 更新 token
            cls.updateAccessToken(grant_type, appid, secret)
        return cls._access_token["token"]

myApp/urls.py

from django.urls import path, re_path
from myApp import views

urlpatterns = [path(r'index/', views.index),
    path(r'weixin/', views.weixin),
    path(r'access/', views.access),
]

myApp/views.py

from django.shortcuts import render, HttpResponse
from django.views.decorators.csrf import csrf_exempt
import hashlib
from myApp.accessToken import AccessToken

def index(request):
    return HttpResponse("sunck is a good man")

@csrf_exempt
def weixin(request):
    pass
            
def access(request):
    access_token = AccessToken.getAccessToken("client_credential", "wxffde55b11cc79754", "84e86527f090d6238ea1c0b96f5fc753")
    return HttpResponse(access_token)