mirror of
https://github.com/silenceper/wechat.git
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98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
package credential
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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/v2/cache"
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"github.com/silenceper/wechat/v2/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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//CacheKeyOfficialAccountPrefix 微信公众号cache key前缀
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CacheKeyOfficialAccountPrefix = "gowechat_officialaccount_"
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)
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//DefaultAccessToken 默认AccessToken 获取
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type DefaultAccessToken struct {
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appID string
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appSecret string
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cacheKeyPrefix string
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cache cache.Cache
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accessTokenLock *sync.Mutex
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}
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//NewDefaultAccessToken new DefaultAccessToken
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func NewDefaultAccessToken(appID, appSecret, cacheKeyPrefix string, cache cache.Cache) AccessTokenHandle {
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if cache == nil {
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panic("cache is ineed")
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}
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return &DefaultAccessToken{
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appID: appID,
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appSecret: appSecret,
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cache: cache,
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cacheKeyPrefix: cacheKeyPrefix,
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accessTokenLock: new(sync.Mutex),
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}
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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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//GetAccessToken 获取access_token,先从cache中获取，没有则从服务端获取
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func (ak *DefaultAccessToken) GetAccessToken() (accessToken string, err error) {
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//加上lock，是为了防止在并发获取token时，cache刚好失效，导致从微信服务器上获取到不同token
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ak.accessTokenLock.Lock()
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defer ak.accessTokenLock.Unlock()
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accessTokenCacheKey := fmt.Sprintf("%s_access_token_%s", ak.cacheKeyPrefix, ak.appID)
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val := ak.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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//cache失效，从微信服务器获取
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var resAccessToken ResAccessToken
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resAccessToken, err = GetTokenFromServer(ak.appID, ak.appSecret)
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if err != nil {
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return
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}
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expires := resAccessToken.ExpiresIn - 1500
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err = ak.cache.Set(accessTokenCacheKey, resAccessToken.AccessToken, time.Duration(expires)*time.Second)
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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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//GetTokenFromServer 强制从微信服务器获取token
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func GetTokenFromServer(appID, appSecret string) (resAccessToken ResAccessToken, err error) {
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url := fmt.Sprintf("%s?grant_type=client_credential&appid=%s&secret=%s", accessTokenURL, appID, 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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return
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}
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