将获取AccessToken和jsTicket单独抽象为interface

openplatform/officialaccount/officialaccount.go

@@ -1,9 +1,9 @@
 package officialaccount
 
 import (
+	"github.com/silenceper/wechat/v2/credential"
 	"github.com/silenceper/wechat/v2/officialaccount"
 	offConfig "github.com/silenceper/wechat/v2/officialaccount/config"
-	offContext "github.com/silenceper/wechat/v2/officialaccount/context"
 	opContext "github.com/silenceper/wechat/v2/openplatform/context"
 )
 
@@ -25,9 +25,25 @@ func NewOfficialAccount(opCtx *opContext.Context, appID string) *OfficialAccount
 		Cache:          opCtx.Cache,
 	})
 	//设置获取access_token的函数
-	officialAccount.GetContext().SetGetAccessTokenFunc(func(offCtx *offContext.Context) (accessToken string, err error) {
-		// 获取授权方的access_token
-		return opCtx.GetAuthrAccessToken(appID)
-	})
+	officialAccount.SetAccessTokenHandle(NewDefaultAuthrAccessToken(opCtx, appID))
 	return &OfficialAccount{appID: appID, OfficialAccount: officialAccount}
 }
+
+//DefaultAuthrAccessToken 默认获取授权ak的方法
+type DefaultAuthrAccessToken struct {
+	opCtx *opContext.Context
+	appID string
+}
+
+//NewDefaultAuthrAccessToken New
+func NewDefaultAuthrAccessToken(opCtx *opContext.Context, appID string) credential.AccessTokenHandle {
+	return &DefaultAuthrAccessToken{
+		opCtx: opCtx,
+		appID: appID,
+	}
+}
+
+//GetAccessToken 获取ak
+func (ak *DefaultAuthrAccessToken) GetAccessToken() (string, error) {
+	return ak.opCtx.GetAuthrAccessToken(ak.appID)
+}