[MM-23264] Get channel member counts by group (#14068)

* MM-23264 Add api endpoint for get groups with members in channel

Add store tests

Add tests for api func

Gofmt

Apply changes from code review

* MM-23264 Make store layers

* MM-23264 Check read permission on channel member counts

* Trigger CI

model/channel.go

@@ -128,6 +128,12 @@ type ChannelSearchOpts struct {
 	PerPage                *int
 }
 
+type ChannelMemberCountByGroup struct {
+	GroupId                     string `db:"-" json:"group_id"`
+	ChannelMemberCount          int64  `db:"-" json:"channel_member_count"`
+	ChannelMemberTimezonesCount int64  `db:"-" json:"channel_member_timezones_count"`
+}
+
 func (o *Channel) DeepCopy() *Channel {
 	copy := *o
 	if copy.SchemeId != nil {
@@ -181,6 +187,12 @@ func ChannelModerationsPatchFromJson(data io.Reader) []*ChannelModerationPatch {
 	return o
 }
 
+func ChannelMemberCountsByGroupFromJson(data io.Reader) []*ChannelMemberCountByGroup {
+	var o []*ChannelMemberCountByGroup
+	json.NewDecoder(data).Decode(&o)
+	return o
+}
+
 func (o *Channel) Etag() string {
 	return Etag(o.Id, o.UpdateAt)
 }

model/client4.go

@@ -5004,3 +5004,12 @@ func (c *Client4) PatchChannelModerations(channelID string, patch []*ChannelMode
 	defer closeBody(r)
 	return ChannelModerationsFromJson(r.Body), BuildResponse(r)
 }
+
+func (c *Client4) GetChannelMemberCountsByGroup(channelID string, includeTimezones bool, etag string) ([]*ChannelMemberCountByGroup, *Response) {
+	r, err := c.DoApiGet(c.GetChannelRoute(channelID)+"/member_counts_by_group?include_timezones="+strconv.FormatBool(includeTimezones), etag)
+	if err != nil {
+		return nil, BuildErrorResponse(r, err)
+	}
+	defer closeBody(r)
+	return ChannelMemberCountsByGroupFromJson(r.Body), BuildResponse(r)
+}