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token.go
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token.go
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package mpwx
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"time"
)
// fix: getAccessToken老接口
// res={ errcode: 40001, errmsg: 'invalid credential, access_token is invalid or not latest rid: xxx' }
// 接口调用凭证 /获取稳定版接口调用凭据
// https://developers.weixin.qq.com/miniprogram/dev/OpenApiDoc/mp-access-token/getStableAccessToken.html
const tokenUrl = "https://api.weixin.qq.com/cgi-bin/stable_token"
type tokenReq struct {
GrantType string `json:"grant_type"`
Appid string `json:"appid"`
Secret string `json:"secret"`
ForceRefresh bool `json:"force_refresh"`
}
type tokenRes struct {
AccessToken string `json:"access_token"`
ExpiresIn int `json:"expires_in"`
}
type tokenState struct {
accessToken string
expiresAt time.Time
}
var stateMap = make(map[string]tokenState)
func (c *MpwxClient) accessToken(ak *string) error {
if c.appid == "" || c.secret == "" { // assert
return fmt.Errorf("appid and secret are both required")
}
if cache, ok := stateMap[c.appid]; ok {
if cache.accessToken != "" && cache.expiresAt.After(time.Now()) {
*ak = cache.accessToken // cache hit
return nil
}
}
startTime := time.Now()
// 设置请求体
var reqBody bytes.Buffer
req := tokenReq{
GrantType: "client_credential",
Appid: c.appid,
Secret: c.secret,
// access_token无效或不是最新的,可以通过getStableAccessToken?
// https://developers.weixin.qq.com/community/develop/doc/0004208ab608983e5610dfa3c66400?jumpto=comment
ForceRefresh: false,
}
if err := json.NewEncoder(&reqBody).Encode(&req); err != nil {
return err
}
// 创建一个请求
r, err := http.NewRequest("POST", tokenUrl, &reqBody)
if err != nil {
return fmt.Errorf("Error creating request: %w", err)
}
// 设置请求头
r.Header.Set("Content-Type", "application/json")
// 发送请求
client := &http.Client{}
resp, err := client.Do(r)
if err != nil {
return fmt.Errorf("Error sending request: %w", err)
}
defer resp.Body.Close()
// 读取响应
var res tokenRes
if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
return fmt.Errorf("Error reading response: %w", err)
}
*ak = res.AccessToken
expiresAt := startTime.Add(time.Duration(res.ExpiresIn) * time.Second)
stateMap[c.appid] = tokenState{res.AccessToken, expiresAt}
return nil
}