From 18d29a19e5ec7e4b52a79ec77bff6cc9a63cd5e9 Mon Sep 17 00:00:00 2001
From: Florian Orben <florian.orben@gmail.com>
Date: Fri, 4 Dec 2015 03:39:37 +0100
Subject: PLT-1380: Post system message when user updates channel header

---
 api/channel.go                | 34 +++++++++++++++++++++++++++++++++-
 model/post.go                 |  3 ++-
 web/react/components/post.jsx |  2 +-
 3 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/api/channel.go b/api/channel.go
index 6fa6ec295..659121bf0 100644
--- a/api/channel.go
+++ b/api/channel.go
@@ -268,19 +268,51 @@ func updateChannelHeader(c *Context, w http.ResponseWriter, r *http.Request) {
 		if !c.HasPermissionsToTeam(channel.TeamId, "updateChannelHeader") {
 			return
 		}
-
+		oldChannelHeader := channel.Header
 		channel.Header = channelHeader
 
 		if ucresult := <-Srv.Store.Channel().Update(channel); ucresult.Err != nil {
 			c.Err = ucresult.Err
 			return
 		} else {
+			PostUpdateChannelHeaderMessageAndForget(c, channel.Id, oldChannelHeader, channelHeader)
 			c.LogAudit("name=" + channel.Name)
 			w.Write([]byte(channel.ToJson()))
 		}
 	}
 }
 
+func PostUpdateChannelHeaderMessageAndForget(c *Context, channelId string, oldChannelHeader, newChannelHeader string) {
+	go func() {
+		uc := Srv.Store.User().Get(c.Session.UserId)
+
+		if uresult := <-uc; uresult.Err != nil {
+			l4g.Error("Failed to retrieve user while trying to save update channel header message %v", uresult.Err)
+			return
+		} else {
+			user := uresult.Data.(*model.User)
+
+			var message string
+			if oldChannelHeader == "" {
+				message = fmt.Sprintf("%s updated the channel header to: %s", user.Username, newChannelHeader)
+			} else if newChannelHeader == "" {
+				message = fmt.Sprintf("%s removed the channel header (was: %s)", user.Username, oldChannelHeader)
+			} else {
+				message = fmt.Sprintf("%s updated the channel header from: %s to: %s", user.Username, oldChannelHeader, newChannelHeader)
+			}
+
+			post := &model.Post{
+				ChannelId: channelId,
+				Message:   message,
+				Type:      model.POST_HEADER_CHANGE,
+			}
+			if _, err := CreatePost(c, post, false); err != nil {
+				l4g.Error("Failed to post join/leave message %v", err)
+			}
+		}
+	}()
+}
+
 func updateChannelPurpose(c *Context, w http.ResponseWriter, r *http.Request) {
 	props := model.MapFromJson(r.Body)
 	channelId := props["channel_id"]
diff --git a/model/post.go b/model/post.go
index 2c90d8b7b..5c86ce70d 100644
--- a/model/post.go
+++ b/model/post.go
@@ -14,6 +14,7 @@ const (
 	POST_DEFAULT               = ""
 	POST_SLACK_ATTACHMENT      = "slack_attachment"
 	POST_JOIN_LEAVE            = "system_join_leave"
+	POST_HEADER_CHANGE         = "system_header_change"
 )
 
 type Post struct {
@@ -105,7 +106,7 @@ func (o *Post) IsValid() *AppError {
 	}
 
 	// should be removed once more message types are supported
-	if !(o.Type == POST_DEFAULT || o.Type == POST_JOIN_LEAVE || o.Type == POST_SLACK_ATTACHMENT) {
+	if !(o.Type == POST_DEFAULT || o.Type == POST_JOIN_LEAVE || o.Type == POST_SLACK_ATTACHMENT || o.Type == POST_HEADER_CHANGE) {
 		return NewAppError("Post.IsValid", "Invalid type", "id="+o.Type)
 	}
 
diff --git a/web/react/components/post.jsx b/web/react/components/post.jsx
index 786a4a325..695d7daef 100644
--- a/web/react/components/post.jsx
+++ b/web/react/components/post.jsx
@@ -152,7 +152,7 @@ export default class Post extends React.Component {
         }
 
         let currentUserCss = '';
-        if (UserStore.getCurrentId() === post.user_id && !post.props.from_webhook) {
+        if (UserStore.getCurrentId() === post.user_id && !post.props.from_webhook && !utils.isSystemMessage(post)) {
             currentUserCss = 'current--user';
         }
 
-- 
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