oauth2,jssdk

js/js.go

@@ -0,0 +1,109 @@
+package js
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/silenceper/wechat/context"
+	"github.com/silenceper/wechat/util"
+)
+
+const getTicketURL = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=%s&type=jsapi"
+
+//Js struct
+type Js struct {
+	*context.Context
+}
+
+//Config 返回给用户jssdk配置信息
+type Config struct {
+	AppID     string
+	TimeStamp int64
+	NonceStr  string
+	Signature string
+}
+
+//resTicket 请求jsapi_tikcet返回结果
+type resTicket struct {
+	util.CommonError
+
+	Ticket    string `json:"ticket"`
+	ExpiresIn int64  `json:"expires_in"`
+}
+
+//NewJs init
+func NewJs(context *context.Context) *Js {
+	js := new(Js)
+	js.Context = context
+	return js
+}
+
+//GetConfig 获取jssdk需要的配置参数
+//uri 为当前网页地址
+func (js *Js) GetConfig(uri string) (config *Config, err error) {
+	config = new(Config)
+	var ticketStr string
+	ticketStr, err = js.getTicket()
+	if err != nil {
+		return
+	}
+
+	nonceStr := util.RandomStr(16)
+	timestamp := util.GetCurrTs()
+	str := fmt.Sprintf("jsapi_ticket=%s&noncestr=%s&timestamp=%d&url=%s", ticketStr, nonceStr, timestamp, uri)
+	sigStr := util.Signature(str)
+
+	config.AppID = js.AppID
+	config.NonceStr = nonceStr
+	config.TimeStamp = timestamp
+	config.Signature = sigStr
+	return
+}
+
+//getTicket 获取jsapi_tocket全局缓存
+func (js *Js) getTicket() (ticketStr string, err error) {
+	js.GetJsApiTicketLock().Lock()
+	defer js.GetJsApiTicketLock().Unlock()
+
+	//先从cache中取
+	jsAPITicketCacheKey := fmt.Sprintf("jsapi_ticket_%s", js.AppID)
+	val := js.Cache.Get(jsAPITicketCacheKey)
+	if val != nil {
+		ticketStr = val.(string)
+		return
+	}
+	var ticket resTicket
+	ticket, err = js.getTicketFromServer()
+	if err != nil {
+		return
+	}
+	ticketStr = ticket.Ticket
+	return
+}
+
+//getTicketFromServer 强制从服务器中获取ticket
+func (js *Js) getTicketFromServer() (ticket resTicket, err error) {
+	var accessToken string
+	accessToken, err = js.GetAccessToken()
+	if err != nil {
+		return
+	}
+
+	var response []byte
+	url := fmt.Sprintf(getTicketURL, accessToken)
+	response, err = util.HTTPGet(url)
+	err = json.Unmarshal(response, &ticket)
+	if err != nil {
+		return
+	}
+	if ticket.ErrCode != 0 {
+		err = fmt.Errorf("getTicket Error : errcode=%s , errmsg=%s", ticket.ErrCode, ticket.ErrMsg)
+		return
+	}
+
+	jsAPITicketCacheKey := fmt.Sprintf("jsapi_ticket_%s", js.AppID)
+	expires := ticket.ExpiresIn - 1500
+	err = js.Cache.Set(jsAPITicketCacheKey, ticket.Ticket, time.Duration(expires)*time.Second)
+	return
+}