添加企业微信外部联系部分的 sdk (#562)

work/externalcontact/follow_user.go

@@ -0,0 +1,39 @@
+package externalcontact
+
+import (
+	"fmt"
+
+	"github.com/silenceper/wechat/v2/util"
+)
+
+const (
+	// FetchFollowUserListURL 获取配置了客户联系功能的成员列表
+	FetchFollowUserListURL = "https://qyapi.weixin.qq.com/cgi-bin/externalcontact/get_follow_user_list"
+)
+
+// followerUserResponse 客户联系功能的成员列表响应
+type followerUserResponse struct {
+	util.CommonError
+	FollowUser []string `json:"follow_user"`
+}
+
+//GetFollowUserList 获取配置了客户联系功能的成员列表
+//@see https://developer.work.weixin.qq.com/document/path/92571
+func (r *Client) GetFollowUserList() ([]string, error) {
+	var accessToken string
+	accessToken, err := r.GetAccessToken()
+	if err != nil {
+		return nil, err
+	}
+	var response []byte
+	response, err = util.HTTPGet(fmt.Sprintf("%s?access_token=%s", FetchFollowUserListURL, accessToken))
+	if err != nil {
+		return nil, err
+	}
+	var result followerUserResponse
+	err = util.DecodeWithError(response, &result, "GetFollowUserList")
+	if err != nil {
+		return nil, err
+	}
+	return result.FollowUser, nil
+}