我正在嘗試從 OpenID 獲取用戶信息https://developers.google.com/identity/protocols/OpenIDConnect#exchangecode我從以下方面得到了象征性的回應：tok, err := bookshelf.OAuthConfig.Exchange(context.Background(), code)我可以檢查tok并看到有一個id_token元素：log.Printf("************ tok  contains %#v", tok)2019/05/13 15:11:24 ************ tok  contains &oauth2.Token{AccessToken:"XXXXXXXXXXX", TokenType:"Bearer", RefreshToken:"", Expiry:time.Time{wall:0xbf2f2c6b181f7b0f, ext:3608126524112, loc:(*time.Location)(0x18516e0)}, raw:map[string]interface {}{"scope":"openid https://www.googleapis.com/auth/profile.emails.read", "token_type":"Bearer", "id_token":"Base64-encodedJSONobject", "access_token":"HASH", "expires_in":3600}}我不明白如何從id_token. 在哪里可以找到從 JWT 獲取負載的示例id_token？當我試圖解碼id_tokenid_token := base64.StdEncoding.DecodeString(tok.id_token)我收到這些錯誤：multiple-value base64.StdEncoding.DecodeString() in single-value context/var/folders/mw/0y88j8_54bjc93d_lg3120qw0000gp/T/tmpbPyjTZappengine-go-bin/auth.go:133:49: tok.id_token undefined (type *oauth2.Token has no field or method id_token)如何使用 OpenID 而不是 Google+ 實現與下面的fetchProfile函數等效的功能？我能找到的唯一示例使用已棄用的 Google+ 庫：func oauthCallbackHandler(w http.ResponseWriter, r *http.Request) *appError {    oauthFlowSession, err := bookshelf.SessionStore.Get(r, r.FormValue("state"))    if err != nil {        return appErrorf(err, "invalid state parameter. try logging in again.")    }    redirectURL, ok := oauthFlowSession.Values[oauthFlowRedirectKey].(string)    // Validate this callback request came from the app.    if !ok {        return appErrorf(err, "invalid state parameter. try logging in again.")    }    code := r.FormValue("code")    tok, err := bookshelf.OAuthConfig.Exchange(context.Background(), code)    if err != nil {        return appErrorf(err, "could not get auth token: %v", err)    }Golang 文檔中有多少漏洞令人驚訝。