Use mattermost v5 module (#1192)

vendor/github.com/mattermost/mattermost-server/v5/model/channel_data.go

@@ -0,0 +1,34 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type ChannelData struct {
+	Channel *Channel       `json:"channel"`
+	Member  *ChannelMember `json:"member"`
+}
+
+func (o *ChannelData) Etag() string {
+	var mt int64 = 0
+	if o.Member != nil {
+		mt = o.Member.LastUpdateAt
+	}
+
+	return Etag(o.Channel.Id, o.Channel.UpdateAt, o.Channel.LastPostAt, mt)
+}
+
+func (o *ChannelData) ToJson() string {
+	b, _ := json.Marshal(o)
+	return string(b)
+}
+
+func ChannelDataFromJson(data io.Reader) *ChannelData {
+	var o *ChannelData
+	json.NewDecoder(data).Decode(&o)
+	return o
+}