SaveToPath moved to global config

accessToken.go

 	"time"
 )
 
-//SaveToPath : where the authtoken json file is stored
-const SaveToPath = "/tmp/wechat_hitxy_token"
+//SaveToPath : where the AuthToken json file is stored
+//const SaveToPath = "/tmp/wechat_hitxy_token"
 
-type authToken struct {
+//AuthToken Access Token, for temporary access WechatAPI
+type AuthToken struct {
 	AccessToken string    `json:"access_token"`
 	ExpireIn    int64     `json:"expires_in"`
 	Time        time.Time `json:"created_at"`
 }
 
+//WechatAccessToken Global AccessToken
+var WechatAccessToken AuthToken
+
 //GetAccessToken returns a valid access_token for wechat_api
 //    the token is auomatically renewed if it's about to expire
 //    if error happens, return empty string and error
 //    if success, return token string and nil
 func GetAccessToken() (string, error) {
-	t, err := readTokenFromFile("/tmp/wechat_hitxy_token")
+	t, err := readTokenFromFile(APIConfig.AuthTokenSaveTo)
 	if isAuthTokenExpired(t) {
-		t, err = renewAuthtoken()
+		t, err = renewAuthToken()
 		if err != nil {
 			return "", err // cannot get token
 		}
 	}
+	WechatAccessToken = t
 	return t.AccessToken, nil
 }
 
-func isAuthTokenExpired(t authToken) bool {
+func isAuthTokenExpired(t AuthToken) bool {
 	seconds := fmt.Sprintf("%ds", t.ExpireIn) //7200s
 	duration, _ := time.ParseDuration(seconds)
 	expire := t.Time.Add(duration)
 
 //save token to perminant storage
 func writeTokenToFile(body []byte, path string) {
-	log.Printf("writing authtoke to %s\r\n", path)
+	log.Printf("writing authtoken to %s\r\n", path)
 	ioutil.WriteFile(path, body, 0600)
 }
 
 //read token from permenant storage
-func readTokenFromFile(path string) (authToken, error) {
-	var m authToken
+func readTokenFromFile(path string) (AuthToken, error) {
+	var m AuthToken
 	log.Printf("read authtoke from %s\r\n", path)
 	body, err := ioutil.ReadFile(path)
 	json.Unmarshal(body, &m)
 }
 
 //issue web request to get token from wechat
-func renewAuthtoken() (authToken, error) {
+func renewAuthToken() (AuthToken, error) {
 	//url := "http://vimeo.com/api/v2/brad/info.json"
 	url := fmt.Sprintf("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s", APIConfig.Appid, APIConfig.AppSecret)
 	var myClient = &http.Client{Timeout: 20 * time.Second}
 	r, err := myClient.Get(url)
 	if err != nil {
-		return authToken{}, err
+		return AuthToken{}, err
 	}
 	defer r.Body.Close()
 
-	var t authToken
+	var t AuthToken
 	err = json.NewDecoder(r.Body).Decode(&t)
 
 	if err != nil {
-		return authToken{}, err
+		return AuthToken{}, err
 	}
 
 	t.Time = time.Now()
 	b, _ := json.Marshal(&t)
-	writeTokenToFile(b, SaveToPath)
+	writeTokenToFile(b, APIConfig.AuthTokenSaveTo)
 	return t, nil
 }