Added ephemeral messages sent when a user mentions someone not in the channel

api/post.go

@@ -15,6 +15,7 @@ import (
 	"net/url"
 	"path/filepath"
 	"regexp"
+	"sort"
 	"strconv"
 	"strings"
 	"time"
@@ -249,7 +250,7 @@ func handlePostEventsAndForget(c *Context, post *model.Post, triggerWebhooks boo
 		}
 
 		sendNotificationsAndForget(c, post, team, channel)
-		go checkForOutOfChannelMentions(post, channel)
+		go checkForOutOfChannelMentions(c, post, channel)
 
 		var user *model.User
 		if result := <-uchan; result.Err != nil {
@@ -729,18 +730,52 @@ func updateMentionCountAndForget(channelId, userId string) {
 	}()
 }
 
-func checkForOutOfChannelMentions(post *model.Post, channel *model.Channel) {
+func checkForOutOfChannelMentions(c *Context, post *model.Post, channel *model.Channel) {
 	// don't check for out of channel mentions in direct channels
 	if channel.Type == model.CHANNEL_DIRECT {
 		return
 	}
 
 	mentioned := getOutOfChannelMentions(post, channel.TeamId)
-
-	// TODO come up with a way to alert the client of these
-	for _, user := range mentioned {
-		l4g.Debug("%v was mentioned and wasn't in the channel", user.Username)
+	if len(mentioned) == 0 {
+		return
 	}
+
+	usernames := make([]string, len(mentioned))
+	for i, user := range mentioned {
+		usernames[i] = user.Username
+	}
+	sort.Strings(usernames)
+
+	var messageText string
+	if len(usernames) == 1 {
+		messageText = c.T("api.post.check_for_out_of_channel_mentions.message.one", map[string]interface{}{
+			"Username": usernames[0],
+		})
+	} else {
+		messageText = c.T("api.post.check_for_out_of_channel_mentions.message.multiple", map[string]interface{}{
+			"Usernames":    strings.Join(usernames[:len(usernames)-1], ", "),
+			"LastUsername": usernames[len(usernames)-1],
+		})
+	}
+
+	// create an ephemeral post that will be sent only to the sender of this original post and not stored in the DB
+	warningPost := model.Post{
+		Id:        model.NewId(),
+		ChannelId: post.ChannelId,
+		Message:   messageText,
+		Type:      model.POST_OUT_OF_CHANNEL_MENTION,
+		CreateAt:  post.CreateAt + 1,
+		Ephemeral: true,
+		Props:     model.StringInterface{},
+		Filenames: []string{},
+	}
+
+	message := model.NewMessage(c.Session.TeamId, channel.Id, post.UserId, model.ACTION_EPHEMERAL_MESSAGE)
+	message.Add("post", warningPost.ToJson())
+	message.Add("channel_type", channel.Type)
+
+	PublishAndForget(message)
 }
 
 // Gets a list of users that were mentioned in a given post that aren't in the channel that the post was made in

api/web_team_hub.go

@@ -101,6 +101,9 @@ func ShouldSendEvent(webCon *WebConn, msg *model.Message) bool {
 			return false
 		} else if msg.Action == model.ACTION_PREFERENCE_CHANGED {
 			return false
+		} else if msg.Action == model.ACTION_EPHEMERAL_MESSAGE {
+			// For now, ephemeral messages are sent directly to individual users
+			return false
 		}
 
 		// Only report events to a user who is the subject of the event, or is in the channel of the event

i18n/en.json

@@ -655,6 +655,14 @@
     "id": "api.oauth.revoke_access_token.get.app_error",
     "translation": "Error getting access token from DB before deletion"
   },
+  {
+    "id": "api.post.check_for_out_of_channel_mentions.message.one",
+    "translation": "{{.Username}} was mentioned, but they do not belong to this channel."
+  },
+  {
+    "id": "api.post.check_for_out_of_channel_mentions.message.multiple",
+    "translation": "{{.Usernames}} and {{.LastUsername}} were mentioned, but they do not belong to this channel."
+  },
   {
     "id": "api.post.create_post.bad_filename.error",
     "translation": "Bad filename discarded, filename=%v"
@@ -3459,4 +3467,4 @@
     "id": "web.watcher_fail.error",
     "translation": "Failed to add directory to watcher %v"
   }
-]
+]

i18n/es.json

@@ -655,6 +655,14 @@
     "id": "api.oauth.revoke_access_token.get.app_error",
     "translation": "Error obteniendo el token de acceso desde la BD antes de ser eliminado"
   },
+  {
+    "id": "api.post.check_for_out_of_channel_mentions.message.one",
+    "translation": "{ .Username } was mentioned, but they do not belong to this channel."
+  },
+  {
+    "id": "api.post.check_for_out_of_channel_mentions.message.multiple",
+    "translation": "{ .Usernames } and { .LastUsername} were mentioned, but they do not belong to this channel."
+  },
   {
     "id": "api.post.create_post.bad_filename.error",
     "translation": "Nombre errado de archivo descartado, archivo=%v"
@@ -3459,4 +3467,4 @@
     "id": "web.watcher_fail.error",
     "translation": "Falla al agregar el directorio a ser vigilado %v"
   }
-]
+]

model/message.go

@@ -18,6 +18,7 @@ const (
 	ACTION_USER_ADDED         = "user_added"
 	ACTION_USER_REMOVED       = "user_removed"
 	ACTION_PREFERENCE_CHANGED = "preference_changed"
+	ACTION_EPHEMERAL_MESSAGE  = "ephemeral_message"
 )
 
 type Message struct {

model/post.go

@@ -10,11 +10,12 @@ import (
 )
 
 const (
-	POST_SYSTEM_MESSAGE_PREFIX = "system_"
-	POST_DEFAULT               = ""
-	POST_SLACK_ATTACHMENT      = "slack_attachment"
-	POST_JOIN_LEAVE            = "system_join_leave"
-	POST_HEADER_CHANGE         = "system_header_change"
+	POST_SYSTEM_MESSAGE_PREFIX  = "system_"
+	POST_DEFAULT                = ""
+	POST_SLACK_ATTACHMENT       = "slack_attachment"
+	POST_JOIN_LEAVE             = "system_join_leave"
+	POST_HEADER_CHANGE          = "system_header_change"
+	POST_OUT_OF_CHANNEL_MENTION = "system_out_of_channel_mention"
 )
 
 type Post struct {
@@ -33,6 +34,7 @@ type Post struct {
 	Hashtags      string          `json:"hashtags"`
 	Filenames     StringArray     `json:"filenames"`
 	PendingPostId string          `json:"pending_post_id" db:"-"`
+	Ephemeral     bool            `json:"ephemeral" db:"-"`
 }
 
 func (o *Post) ToJson() string {

web/react/stores/socket_store.jsx

@@ -109,6 +109,7 @@ class SocketStoreClass extends EventEmitter {
     handleMessage(msg) {
         switch (msg.action) {
         case SocketEvents.POSTED:
+        case SocketEvents.EPHEMERAL_MESSAGE:
             handleNewPostEvent(msg, this.translations);
             break;
 

web/react/utils/constants.jsx

@@ -79,7 +79,8 @@ export default {
         USER_ADDED: 'user_added',
         USER_REMOVED: 'user_removed',
         TYPING: 'typing',
-        PREFERENCE_CHANGED: 'preference_changed'
+        PREFERENCE_CHANGED: 'preference_changed',
+        EPHEMERAL_MESSAGE: 'ephemeral_message'
     },
 
     //SPECIAL_MENTIONS: ['all', 'channel'],