func (clt *Client) updateToken(tk *Token, url string) (err error) {
api.DebugPrintGetRequest(url)
httpResp, err := clt.httpClient().Get(url)
if err != nil {
return
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
return fmt.Errorf("http.Status: %s", httpResp.Status)
}
var result struct {
Error
Token
}
if err = api.DecodeJSONHttpResponse(httpResp.Body, &result); err != nil {
return
}
if result.ErrCode != ErrCodeOK {
return &result.Error
}
// 由于网络的延时 和 分布式服务器之间的时间可能不是绝对同步, access_token 过期时间留了一个缓冲区
switch {
case result.ExpiresIn > 31556952: // 60*60*24*365.2425
return errors.New("expires_in too large: " + strconv.FormatInt(result.ExpiresIn, 10))
case result.ExpiresIn > 60*60:
result.ExpiresIn -= 60 * 20
case result.ExpiresIn > 60*30:
result.ExpiresIn -= 60 * 10
case result.ExpiresIn > 60*15:
result.ExpiresIn -= 60 * 5
case result.ExpiresIn > 60*5:
result.ExpiresIn -= 60
case result.ExpiresIn > 60:
result.ExpiresIn -= 20
default:
return errors.New("expires_in too small: " + strconv.FormatInt(result.ExpiresIn, 10))
}
tk.AccessToken = result.AccessToken
tk.CreatedAt = time.Now().Unix()
tk.ExpiresIn = result.ExpiresIn
if result.RefreshToken != "" {
tk.RefreshToken = result.RefreshToken
}
if result.OpenId != "" {
tk.OpenId = result.OpenId
}
if result.UnionId != "" {
tk.UnionId = result.UnionId
}
if result.Scope != "" {
tk.Scope = result.Scope
}
return
}
func httpGetJSON(clt *http.Client, url string, response interface{}) error {
api.DebugPrintGetRequest(url)
httpResp, err := clt.Get(url)
if err != nil {
return err
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
return fmt.Errorf("http.Status: %s", httpResp.Status)
}
return api.DecodeJSONHttpResponse(httpResp.Body, response)
}
// GetUserInfo 获取用户信息.
// accessToken: 网页授权接口调用凭证
// openId: 用户的唯一标识
// lang: 返回国家地区语言版本，zh_CN 简体，zh_TW 繁体，en 英语, 如果留空 "" 则默认为 zh_CN
// httpClient: 如果不指定则默认为 http.DefaultClient
func GetUserInfo(accessToken, openId, lang string, httpClient *http.Client) (info *UserInfo, err error) {
switch lang {
case "":
lang = LanguageZhCN
case LanguageZhCN, LanguageZhTW, LanguageEN:
default:
lang = LanguageZhCN
}
if httpClient == nil {
httpClient = http.DefaultClient
}
_url := "https://api.weixin.qq.com/sns/userinfo?access_token=" + url.QueryEscape(accessToken) +
"&openid=" + url.QueryEscape(openId) +
"&lang=" + lang
api.DebugPrintGetRequest(_url)
httpResp, err := httpClient.Get(_url)
if err != nil {
return
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
err = fmt.Errorf("http.Status: %s", httpResp.Status)
return
}
var result struct {
oauth2.Error
UserInfo
}
if err = api.DecodeJSONHttpResponse(httpResp.Body, &result); err != nil {
return
}
if result.ErrCode != oauth2.ErrCodeOK {
err = &result.Error
return
}
info = &result.UserInfo
return
}
// DownloadToWriter 通过ticket换取二维码, 写入到 writer.
// 如果 clt == nil 则默认用 http.DefaultClient.
func DownloadToWriter(ticket string, writer io.Writer, clt *http.Client) (written int64, err error) {
if clt == nil {
clt = http.DefaultClient
}
url := QrcodePicURL(ticket)
api.DebugPrintGetRequest(url)
httpResp, err := clt.Get(url)
if err != nil {
return
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
err = fmt.Errorf("http.Status: %s", httpResp.Status)
return
}
return io.Copy(writer, httpResp.Body)
}
func httpDownloadToWriter(clt *http.Client, url string, writer io.Writer, errorResult *core.Error) (written int64, err error) {
api.DebugPrintGetRequest(url)
httpResp, err := clt.Get(url)
if err != nil {
return 0, err
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
return 0, fmt.Errorf("http.Status: %s", httpResp.Status)
}
ContentDisposition := httpResp.Header.Get("Content-Disposition")
ContentType, _, _ := mime.ParseMediaType(httpResp.Header.Get("Content-Type"))
if ContentDisposition != "" && ContentType != "text/plain" && ContentType != "application/json" {
// 返回的是媒体流
return io.Copy(writer, httpResp.Body)
} else {
// 返回的是错误信息
return 0, api.DecodeJSONHttpResponse(httpResp.Body, errorResult)
}
}
// Auth 检验授权凭证 access_token 是否有效.
// accessToken: 网页授权接口调用凭证
// openId: 用户的唯一标识
// httpClient: 如果不指定则默认为 http.DefaultClient
func Auth(accessToken, openId string, httpClient *http.Client) (valid bool, err error) {
if httpClient == nil {
httpClient = http.DefaultClient
}
_url := "https://api.weixin.qq.com/sns/auth?access_token=" + url.QueryEscape(accessToken) +
"&openid=" + url.QueryEscape(openId)
api.DebugPrintGetRequest(_url)
httpResp, err := httpClient.Get(_url)
if err != nil {
return
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
err = fmt.Errorf("http.Status: %s", httpResp.Status)
return
}
var result oauth2.Error
if err = api.DecodeJSONHttpResponse(httpResp.Body, &result); err != nil {
return
}
switch result.ErrCode {
case oauth2.ErrCodeOK:
valid = true
return
case 42001, 40001, 40014, 40003:
valid = false
return
default:
err = &result
return
}
}
// updateToken 从微信服务器获取新的 access_token 并存入缓存, 同时返回该 access_token.
func (srv *DefaultAccessTokenServer) updateToken(currentToken string) (token *accessToken, cached bool, err error) {
if currentToken != "" {
if p := (*accessToken)(atomic.LoadPointer(&srv.tokenCache)); p != nil && currentToken != p.Token {
return p, true, nil // 无需更改 p.ExpiresIn 参数值, cached == true 时用不到
}
}
url := "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + srv.appId +
"&secret=" + srv.appSecret
api.DebugPrintGetRequest(url)
httpResp, err := srv.httpClient.Get(url)
if err != nil {
atomic.StorePointer(&srv.tokenCache, nil)
return
}
defer httpResp.Body.Close()
if httpResp.StatusCode != http.StatusOK {
atomic.StorePointer(&srv.tokenCache, nil)
err = fmt.Errorf("http.Status: %s", httpResp.Status)
return
}
var result struct {
Error
accessToken
}
if err = api.DecodeJSONHttpResponse(httpResp.Body, &result); err != nil {
atomic.StorePointer(&srv.tokenCache, nil)
return
}
if result.ErrCode != ErrCodeOK {
atomic.StorePointer(&srv.tokenCache, nil)
err = &result.Error
return
}
// 由于网络的延时, access_token 过期时间留有一个缓冲区
switch {
case result.ExpiresIn > 31556952: // 60*60*24*365.2425
atomic.StorePointer(&srv.tokenCache, nil)
err = errors.New("expires_in too large: " + strconv.FormatInt(result.ExpiresIn, 10))
return
case result.ExpiresIn > 60*60:
result.ExpiresIn -= 60 * 10
case result.ExpiresIn > 60*30:
result.ExpiresIn -= 60 * 5
case result.ExpiresIn > 60*5:
result.ExpiresIn -= 60
case result.ExpiresIn > 60:
result.ExpiresIn -= 10
default:
atomic.StorePointer(&srv.tokenCache, nil)
err = errors.New("expires_in too small: " + strconv.FormatInt(result.ExpiresIn, 10))
return
}
tokenCopy := result.accessToken
atomic.StorePointer(&srv.tokenCache, unsafe.Pointer(&tokenCopy))
token = &tokenCopy
return
}