use context when getting access token (#815)

* use context

Signed-off-by: mqf20 <mingqingfoo@gmail.com>

* added docs

Signed-off-by: mqf20 <mingqingfoo@gmail.com>

* improved docs

Signed-off-by: mqf20 <mingqingfoo@gmail.com>

* added SetAccessTokenContextHandle

Signed-off-by: mqf20 <mingqingfoo@gmail.com>

---------

Signed-off-by: mqf20 <mingqingfoo@gmail.com>

openplatform/miniprogram/miniprogram.go

@@ -1,6 +1,7 @@
 package miniprogram
 
 import (
+	originalContext "context"
 	"fmt"
 
 	"github.com/silenceper/wechat/v2/credential"
@@ -37,6 +38,22 @@ func (miniProgram *MiniProgram) GetAccessToken() (string, error) {
 	return akRes.AccessToken, nil
 }
 
+// GetAccessTokenContext 利用ctx获取ak
+func (miniProgram *MiniProgram) GetAccessTokenContext(ctx originalContext.Context) (string, error) {
+	ak, akErr := miniProgram.openContext.GetAuthrAccessTokenContext(ctx, miniProgram.AppID)
+	if akErr == nil {
+		return ak, nil
+	}
+	if miniProgram.authorizerRefreshToken == "" {
+		return "", fmt.Errorf("please set the authorizer_refresh_token first")
+	}
+	akRes, akResErr := miniProgram.GetComponent().RefreshAuthrTokenContext(ctx, miniProgram.AppID, miniProgram.authorizerRefreshToken)
+	if akResErr != nil {
+		return "", akResErr
+	}
+	return akRes.AccessToken, nil
+}
+
 // SetAuthorizerRefreshToken 设置代执操作业务授权账号authorizer_refresh_token
 func (miniProgram *MiniProgram) SetAuthorizerRefreshToken(authorizerRefreshToken string) *MiniProgram {
 	miniProgram.authorizerRefreshToken = authorizerRefreshToken
@@ -68,7 +85,7 @@ func (miniProgram *MiniProgram) GetBasic() *basic.Basic {
 // GetURLLink 小程序URL Link接口 调用前需确认已调用 SetAuthorizerRefreshToken 避免由于缓存中 authorizer_access_token 过期执行中断
 func (miniProgram *MiniProgram) GetURLLink() *urllink.URLLink {
 	return urllink.NewURLLink(&miniContext.Context{
-		AccessTokenHandle: miniProgram,
+		AccessTokenContextHandle: miniProgram,
 	})
 }