PLT-4403 Add server-based channel autocomplete, search and paging (#4585)

* Add more channel paging API

* Add channel paging support to client

* Add DB channel search functions

* Add API for searching more channels

* Add more channel search functionality to client

* Add API for autocompleting channels

* Add channel autocomplete functionality to the client

* Move to be deprecated APIs to their own file

* Final clean-up

* Fixes related to feedback

* Localization changes

* Add unit as suffix to timeout constants

api/command_join.go

@@ -33,25 +33,22 @@ func (me *JoinProvider) GetCommand(c *Context) *model.Command {
 }
 
 func (me *JoinProvider) DoCommand(c *Context, channelId string, message string) *model.CommandResponse {
-	if result := <-Srv.Store.Channel().GetMoreChannels(c.TeamId, c.Session.UserId); result.Err != nil {
+	if result := <-Srv.Store.Channel().GetByName(c.TeamId, message); result.Err != nil {
 		return &model.CommandResponse{Text: c.T("api.command_join.list.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
 	} else {
-		channels := result.Data.(*model.ChannelList)
+		channel := result.Data.(*model.Channel)
 
-		for _, v := range *channels {
+		if channel.Name == message {
 
-			if v.Name == message {
-
-				if v.Type != model.CHANNEL_OPEN {
-					return &model.CommandResponse{Text: c.T("api.command_join.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
-				}
-
-				if err, _ := JoinChannelById(c, c.Session.UserId, v.Id); err != nil {
-					return &model.CommandResponse{Text: c.T("api.command_join.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
-				}
-
-				return &model.CommandResponse{GotoLocation: c.GetTeamURL() + "/channels/" + v.Name, Text: c.T("api.command_join.success"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+			if channel.Type != model.CHANNEL_OPEN {
+				return &model.CommandResponse{Text: c.T("api.command_join.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
 			}
+
+			if err, _ := JoinChannelById(c, c.Session.UserId, channel.Id); err != nil {
+				return &model.CommandResponse{Text: c.T("api.command_join.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+			}
+
+			return &model.CommandResponse{GotoLocation: c.GetTeamURL() + "/channels/" + channel.Name, Text: c.T("api.command_join.success"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
 		}
 	}