Added serverside check for a post that @mentions someone who isn't in the channel

api/post.go

@@ -249,6 +249,7 @@ func handlePostEventsAndForget(c *Context, post *model.Post, triggerWebhooks boo
 		}
 
 		sendNotificationsAndForget(c, post, team, channel)
+		go checkForOutOfChannelMentions(post, channel)
 
 		var user *model.User
 		if result := <-uchan; result.Err != nil {
@@ -728,6 +729,58 @@ func updateMentionCountAndForget(channelId, userId string) {
 	}()
 }
 
+func checkForOutOfChannelMentions(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)
+	}
+}
+
+// Gets a list of users that were mentioned in a given post that aren't in the channel that the post was made in
+func getOutOfChannelMentions(post *model.Post, teamId string) []*model.User {
+	pchan := Srv.Store.User().GetProfiles(teamId)
+	mchan := Srv.Store.Channel().GetMembers(post.ChannelId)
+
+	var profiles map[string]*model.User
+	if result := <-pchan; result.Err != nil {
+		l4g.Error(utils.T("api.post.get_out_of_channel_mentions.retrieve_profiles.error"), teamId, result.Err)
+		return []*model.User{}
+	} else {
+		profiles = result.Data.(map[string]*model.User)
+	}
+
+	// only keep profiles which aren't in the current channel
+	if result := <-mchan; result.Err != nil {
+		l4g.Error(utils.T("api.post.get_out_of_channel_mentions.retrieve_members.error"), post.ChannelId, result.Err)
+		return []*model.User{}
+	} else {
+		members := result.Data.([]model.ChannelMember)
+
+		for _, member := range members {
+			delete(profiles, member.UserId)
+		}
+	}
+
+	var mentioned []*model.User
+
+	for _, profile := range profiles {
+		if pattern, err := regexp.Compile(`(\W|^)@` + regexp.QuoteMeta(profile.Username) + `(\W|$)`); err != nil {
+			l4g.Error(utils.T("api.post.get_out_of_channel_mentions.regex.error"), profile.Id, err)
+		} else if pattern.MatchString(post.Message) {
+			mentioned = append(mentioned, profile)
+		}
+	}
+
+	return mentioned
+}
+
 func updatePost(c *Context, w http.ResponseWriter, r *http.Request) {
 	post := model.PostFromJson(r.Body)
 

api/post_test.go

@@ -857,3 +857,71 @@ func TestMakeDirectChannelVisible(t *testing.T) {
 		t.Fatal("Failed to set direct channel to be visible for user2")
 	}
 }
+
+func TestGetOutOfChannelMentions(t *testing.T) {
+	Setup()
+
+	team1 := &model.Team{DisplayName: "Name", Name: "z-z-" + model.NewId() + "a", Email: "test@nowhere.com", Type: model.TEAM_OPEN}
+	team1 = Client.Must(Client.CreateTeam(team1)).Data.(*model.Team)
+
+	user1 := &model.User{TeamId: team1.Id, Email: model.NewId() + "corey+test@test.com", Nickname: "Corey Hulen", Password: "pwd", Username: "user1"}
+	user1 = Client.Must(Client.CreateUser(user1, "")).Data.(*model.User)
+	store.Must(Srv.Store.User().VerifyEmail(user1.Id))
+
+	user2 := &model.User{TeamId: team1.Id, Email: model.NewId() + "corey+test@test.com", Nickname: "Corey Hulen", Password: "pwd", Username: "user2"}
+	user2 = Client.Must(Client.CreateUser(user2, "")).Data.(*model.User)
+	store.Must(Srv.Store.User().VerifyEmail(user2.Id))
+
+	user3 := &model.User{TeamId: team1.Id, Email: model.NewId() + "corey+test@test.com", Nickname: "Corey Hulen", Password: "pwd", Username: "user3"}
+	user3 = Client.Must(Client.CreateUser(user3, "")).Data.(*model.User)
+	store.Must(Srv.Store.User().VerifyEmail(user3.Id))
+
+	Client.Must(Client.LoginByEmail(team1.Name, user1.Email, "pwd"))
+
+	channel1 := &model.Channel{DisplayName: "Test API Name", Name: "a" + model.NewId() + "a", Type: model.CHANNEL_OPEN, TeamId: team1.Id}
+	channel1 = Client.Must(Client.CreateChannel(channel1)).Data.(*model.Channel)
+
+	// test a post that doesn't @mention anybody
+	post1 := &model.Post{ChannelId: channel1.Id, Message: "user1 user2 user3"}
+	if mentioned := getOutOfChannelMentions(post1, team1.Id); len(mentioned) != 0 {
+		t.Fatalf("getOutOfChannelMentions returned %v when no users were mentioned", mentioned)
+	}
+
+	// test a post that @mentions someone in the channel
+	post2 := &model.Post{ChannelId: channel1.Id, Message: "@user1 is user1"}
+	if mentioned := getOutOfChannelMentions(post2, team1.Id); len(mentioned) != 0 {
+		t.Fatalf("getOutOfChannelMentions returned %v when only users in the channel were mentioned", mentioned)
+	}
+
+	// test a post that @mentions someone not in the channel
+	post3 := &model.Post{ChannelId: channel1.Id, Message: "@user2 and @user3 aren't in the channel"}
+	if mentioned := getOutOfChannelMentions(post3, team1.Id); len(mentioned) != 2 || (mentioned[0].Id != user2.Id && mentioned[0].Id != user3.Id) || (mentioned[1].Id != user2.Id && mentioned[1].Id != user3.Id) {
+		t.Fatalf("getOutOfChannelMentions returned %v when two users outside the channel were mentioned", mentioned)
+	}
+
+	// test a post that @mentions someone not in the channel as well as someone in the channel
+	post4 := &model.Post{ChannelId: channel1.Id, Message: "@user2 and @user1 might be in the channel"}
+	if mentioned := getOutOfChannelMentions(post4, team1.Id); len(mentioned) != 1 || mentioned[0].Id != user2.Id {
+		t.Fatalf("getOutOfChannelMentions returned %v when someone in the channel and someone  outside the channel were mentioned", mentioned)
+	}
+
+	Client.Must(Client.Logout())
+
+	team2 := &model.Team{DisplayName: "Name", Name: "z-z-" + model.NewId() + "a", Email: "test@nowhere.com", Type: model.TEAM_OPEN}
+	team2 = Client.Must(Client.CreateTeam(team2)).Data.(*model.Team)
+
+	user4 := &model.User{TeamId: team2.Id, Email: model.NewId() + "corey+test@test.com", Nickname: "Corey Hulen", Password: "pwd", Username: "user4"}
+	user4 = Client.Must(Client.CreateUser(user4, "")).Data.(*model.User)
+	store.Must(Srv.Store.User().VerifyEmail(user4.Id))
+
+	Client.Must(Client.LoginByEmail(team2.Name, user4.Email, "pwd"))
+
+	channel2 := &model.Channel{DisplayName: "Test API Name", Name: "a" + model.NewId() + "a", Type: model.CHANNEL_OPEN, TeamId: team2.Id}
+	channel2 = Client.Must(Client.CreateChannel(channel2)).Data.(*model.Channel)
+
+	// test a post that @mentions someone on a different team
+	post5 := &model.Post{ChannelId: channel2.Id, Message: "@user2 and @user3 might be in the channel"}
+	if mentioned := getOutOfChannelMentions(post5, team2.Id); len(mentioned) != 0 {
+		t.Fatalf("getOutOfChannelMentions returned %v when two users on a different team were mentioned", mentioned)
+	}
+}