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/
access_token.go
97 lines (82 loc) · 2.61 KB
/
access_token.go
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package context
import (
"context"
"encoding/json"
"errors"
"fmt"
"sync"
"time"
"github.com/go-redis/redis/v8"
"github.com/gotomicro/ego-component/ewechat/util"
)
const (
// AccessTokenURL 获取access_token的接口
AccessTokenURL = "https://api.weixin.qq.com/cgi-bin/token"
)
// ResAccessToken struct
type ResAccessToken struct {
util.CommonError
AccessToken string `json:"access_token"`
ExpiresIn int64 `json:"expires_in"`
}
// GetAccessTokenFunc 获取 access token 的函数签名
type GetAccessTokenFunc func(ctx *Context) (accessToken string, err error)
// SetAccessTokenLock 设置读写锁(一个appID一个读写锁)
func (ctx *Context) SetAccessTokenLock(l *sync.RWMutex) {
ctx.accessTokenLock = l
}
// SetGetAccessTokenFunc 设置自定义获取accessToken的方式, 需要自己实现缓存
func (ctx *Context) SetGetAccessTokenFunc(f GetAccessTokenFunc) {
ctx.accessTokenFunc = f
}
// GetAccessToken 获取access_token
func (ctx *Context) GetAccessToken() (accessToken string, err error) {
ctx.accessTokenLock.Lock()
defer ctx.accessTokenLock.Unlock()
if ctx.accessTokenFunc != nil {
return ctx.accessTokenFunc(ctx)
}
accessTokenCacheKey := fmt.Sprintf("access_token_%s", ctx.AppID)
accessToken, err = ctx.Cache.Get(context.Background(), accessTokenCacheKey)
if err != nil && !errors.Is(err, redis.Nil) {
return "", err
}
if accessToken != "" {
return accessToken, nil
}
// 从微信服务器获取
var resAccessToken ResAccessToken
resAccessToken, err = ctx.GetAccessTokenFromServer()
if err != nil {
err = fmt.Errorf("get access token err %w", err)
return
}
accessToken = resAccessToken.AccessToken
return
}
// GetAccessTokenFromServer 强制从微信服务器获取token
func (ctx *Context) GetAccessTokenFromServer() (resAccessToken ResAccessToken, err error) {
url := fmt.Sprintf("%s?grant_type=client_credential&appid=%s&secret=%s", AccessTokenURL, ctx.AppID, ctx.AppSecret)
var body []byte
body, err = ctx.HTTPGet(url)
if err != nil {
return
}
err = json.Unmarshal(body, &resAccessToken)
if err != nil {
err = fmt.Errorf("access token from server parse json err %w", err)
return
}
if resAccessToken.ErrMsg != "" {
err = fmt.Errorf("get access_token error : errcode=%v , errormsg=%v", resAccessToken.ErrCode, resAccessToken.ErrMsg)
return
}
accessTokenCacheKey := fmt.Sprintf("access_token_%s", ctx.AppID)
expires := resAccessToken.ExpiresIn - 1500
err = ctx.Cache.Set(context.Background(), accessTokenCacheKey, resAccessToken.AccessToken, time.Duration(expires)*time.Second)
if err != nil {
err = fmt.Errorf("set token error %w", err)
return
}
return
}