增加获取永久素材接口

material/material.go

@@ -13,6 +13,7 @@ const (
 	addNewsURL     = "https://api.weixin.qq.com/cgi-bin/material/add_news"
 	addMaterialURL = "https://api.weixin.qq.com/cgi-bin/material/add_material"
 	delMaterialURL = "https://api.weixin.qq.com/cgi-bin/material/del_material"
+	getMaterialURL = "https://api.weixin.qq.com/cgi-bin/material/get_material"
 )
 
 //Material 素材管理
@@ -36,6 +37,33 @@ type Article struct {
 	ShowCoverPic     int    `json:"show_cover_pic"`
 	Content          string `json:"content"`
 	ContentSourceURL string `json:"content_source_url"`
+	URL              string `json:"url"`
+	DownURL          string `json:"down_url"`
+}
+
+// GetNews 获取/下载永久素材
+func (material *Material) GetNews(id string) ([]*Article, error) {
+	accessToken, err := material.GetAccessToken()
+	if err != nil {
+		return nil, err
+	}
+	uri := fmt.Sprintf("%s?access_token=%s", getMaterialURL, accessToken)
+
+	var req struct {
+		MediaID string `json:"media_id"`
+	}
+	req.MediaID = id
+	responseBytes, err := util.PostJSON(uri, req)
+
+	var res struct {
+		NewsItem []*Article `json:"news_item"`
+	}
+	err = json.Unmarshal(responseBytes, &res)
+	if err != nil {
+		return nil, err
+	}
+
+	return res.NewsItem, nil
 }
 
 //reqArticles 永久性图文素材请求信息