forked from golang/hotime
110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
package js
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import (
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"encoding/json"
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"fmt"
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"time"
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"github.com/silenceper/wechat/context"
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"github.com/silenceper/wechat/util"
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)
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const getTicketURL = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=%s&type=jsapi"
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// Js struct
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type Js struct {
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*context.Context
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}
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// Config 返回给用户jssdk配置信息
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type Config struct {
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AppID string `json:"app_id"`
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Timestamp int64 `json:"timestamp"`
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NonceStr string `json:"nonce_str"`
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Signature string `json:"signature"`
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}
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// resTicket 请求jsapi_tikcet返回结果
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type resTicket struct {
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util.CommonError
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Ticket string `json:"ticket"`
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ExpiresIn int64 `json:"expires_in"`
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}
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//NewJs init
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func NewJs(context *context.Context) *Js {
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js := new(Js)
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js.Context = context
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return js
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}
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//GetConfig 获取jssdk需要的配置参数
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//uri 为当前网页地址
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func (js *Js) GetConfig(uri string) (config *Config, err error) {
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config = new(Config)
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var ticketStr string
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ticketStr, err = js.GetTicket()
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if err != nil {
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return
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}
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nonceStr := util.RandomStr(16)
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timestamp := util.GetCurrTs()
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str := fmt.Sprintf("jsapi_ticket=%s&noncestr=%s×tamp=%d&url=%s", ticketStr, nonceStr, timestamp, uri)
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sigStr := util.Signature(str)
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config.AppID = js.AppID
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config.NonceStr = nonceStr
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config.Timestamp = timestamp
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config.Signature = sigStr
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return
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}
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//GetTicket 获取jsapi_ticket
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func (js *Js) GetTicket() (ticketStr string, err error) {
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js.GetJsAPITicketLock().Lock()
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defer js.GetJsAPITicketLock().Unlock()
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//先从cache中取
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jsAPITicketCacheKey := fmt.Sprintf("jsapi_ticket_%s", js.AppID)
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val := js.Cache.Get(jsAPITicketCacheKey)
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if val != nil {
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ticketStr = val.(string)
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return
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}
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var ticket resTicket
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ticket, err = js.getTicketFromServer()
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if err != nil {
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return
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}
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ticketStr = ticket.Ticket
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return
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}
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//getTicketFromServer 强制从服务器中获取ticket
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func (js *Js) getTicketFromServer() (ticket resTicket, err error) {
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var accessToken string
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accessToken, err = js.GetAccessToken()
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if err != nil {
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return
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}
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var response []byte
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url := fmt.Sprintf(getTicketURL, accessToken)
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response, err = util.HTTPGet(url)
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err = json.Unmarshal(response, &ticket)
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if err != nil {
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return
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}
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if ticket.ErrCode != 0 {
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err = fmt.Errorf("getTicket Error : errcode=%d , errmsg=%s", ticket.ErrCode, ticket.ErrMsg)
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return
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}
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jsAPITicketCacheKey := fmt.Sprintf("jsapi_ticket_%s", js.AppID)
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expires := ticket.ExpiresIn - 1500
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err = js.Cache.Set(jsAPITicketCacheKey, ticket.Ticket, time.Duration(expires)*time.Second)
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return
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}
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