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