88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
package credential
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import (
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"encoding/json"
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"fmt"
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"sync"
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"time"
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"github.com/silenceper/wechat/v2/cache"
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"github.com/silenceper/wechat/v2/util"
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)
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// getTicketURL 获取ticket的url
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const getTicketURL = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=%s&type=jsapi"
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// DefaultJsTicket 默认获取js ticket方法
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type DefaultJsTicket struct {
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appID string
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cacheKeyPrefix string
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cache cache.Cache
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// jsAPITicket 读写锁 同一个AppID一个
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jsAPITicketLock *sync.Mutex
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}
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// NewDefaultJsTicket new
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func NewDefaultJsTicket(appID string, cacheKeyPrefix string, cache cache.Cache) JsTicketHandle {
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return &DefaultJsTicket{
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appID: appID,
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cache: cache,
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cacheKeyPrefix: cacheKeyPrefix,
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jsAPITicketLock: new(sync.Mutex),
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}
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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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// GetTicket 获取jsapi_ticket
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func (js *DefaultJsTicket) GetTicket(accessToken string) (ticketStr string, err error) {
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// 先从cache中取
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jsAPITicketCacheKey := fmt.Sprintf("%s_jsapi_ticket_%s", js.cacheKeyPrefix, js.appID)
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if val := js.cache.Get(jsAPITicketCacheKey); val != nil {
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return val.(string), nil
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}
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js.jsAPITicketLock.Lock()
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defer js.jsAPITicketLock.Unlock()
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// 双检，防止重复从微信服务器获取
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if val := js.cache.Get(jsAPITicketCacheKey); val != nil {
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return val.(string), nil
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}
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var ticket ResTicket
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ticket, err = GetTicketFromServer(accessToken)
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if err != nil {
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return
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}
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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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ticketStr = ticket.Ticket
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return
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}
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// GetTicketFromServer 从服务器中获取ticket
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func GetTicketFromServer(accessToken string) (ticket ResTicket, err error) {
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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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if err != nil {
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return
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}
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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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return
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}
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