MM-10699 Add channel renaming to CLI (#9094)

app/channel.go

@@ -159,6 +159,21 @@ func (a *App) CreateChannelWithUser(channel *model.Channel, userId string) (*mod
 	return rchannel, nil
 }
 
+// RenameChannel is used to rename the channel Name and the DisplayName fields
+func (a *App) RenameChannel(channel *model.Channel, newChannelName string, newDisplayName string) (*model.Channel, *model.AppError) {
+	channel.Name = newChannelName
+	if newDisplayName != "" {
+		channel.DisplayName = newDisplayName
+	}
+
+	newChannel, err := a.UpdateChannel(channel)
+	if err != nil {
+		return nil, err
+	}
+
+	return newChannel, nil
+}
+
 func (a *App) CreateChannel(channel *model.Channel, addMember bool) (*model.Channel, *model.AppError) {
 	if result := <-a.Srv.Store.Channel().Save(channel, *a.Config().TeamSettings.MaxChannelsPerTeam); result.Err != nil {
 		return nil, result.Err

app/channel_test.go

@@ -605,3 +605,17 @@ func TestFillInChannelProps(t *testing.T) {
 		}
 	})
 }
+
+func TestRenameChannel(t *testing.T) {
+	th := Setup().InitBasic()
+	defer th.TearDown()
+
+	channel := th.createChannel(th.BasicTeam, model.CHANNEL_OPEN)
+
+	channel, err := th.App.RenameChannel(channel, "newchannelname", "New Display Name")
+	if err != nil {
+		t.Fatal("Failed to update channel name. Error: " + err.Error())
+	}
+	assert.Equal(t, "newchannelname", channel.Name)
+	assert.Equal(t, "New Display Name", channel.DisplayName)
+}