PLT-1598 Slash command works in RHS (#4367)

* PLT-1598 Slash command works in RHS

* fix UserProfile in the reply for Slash Command

* fix some problem about the system messages in RHS
* system message in RHS isn't displayed as comment for root message

* remove status indicator for system message in RHS

* system message in RHS is colored to grey

* system messages don't count as commented post

* fix bug about cleaning draft in RHS

* remove unnecessary function

* implement new model for executing command

api/command.go

@@ -20,7 +20,7 @@ import (
 type CommandProvider interface {
 	GetTrigger() string
 	GetCommand(c *Context) *model.Command
-	DoCommand(c *Context, channelId string, message string) *model.CommandResponse
+	DoCommand(c *Context, args *model.CommandArgs, message string) *model.CommandResponse
 }
 
 var commandProviders = make(map[string]CommandProvider)
@@ -88,30 +88,28 @@ func listCommands(c *Context, w http.ResponseWriter, r *http.Request) {
 }
 
 func executeCommand(c *Context, w http.ResponseWriter, r *http.Request) {
-	props := model.MapFromJson(r.Body)
-	command := strings.TrimSpace(props["command"])
-	channelId := strings.TrimSpace(props["channelId"])
+	commandArgs := model.CommandArgsFromJson(r.Body)
 
-	if len(command) <= 1 || strings.Index(command, "/") != 0 {
+	if len(commandArgs.Command) <= 1 || strings.Index(commandArgs.Command, "/") != 0 {
 		c.Err = model.NewLocAppError("executeCommand", "api.command.execute_command.start.app_error", nil, "")
 		return
 	}
 
-	if len(channelId) > 0 {
-		if !HasPermissionToChannelContext(c, channelId, model.PERMISSION_USE_SLASH_COMMANDS) {
+	if len(commandArgs.ChannelId) > 0 {
+		if !HasPermissionToChannelContext(c, commandArgs.ChannelId, model.PERMISSION_USE_SLASH_COMMANDS) {
 			return
 		}
 	}
 
-	parts := strings.Split(command, " ")
+	parts := strings.Split(commandArgs.Command, " ")
 	trigger := parts[0][1:]
 	trigger = strings.ToLower(trigger)
 	message := strings.Join(parts[1:], " ")
 	provider := GetCommandProvider(trigger)
 
 	if provider != nil {
-		response := provider.DoCommand(c, channelId, message)
-		handleResponse(c, w, response, channelId, provider.GetCommand(c), true)
+		response := provider.DoCommand(c, commandArgs, message)
+		handleResponse(c, w, response, commandArgs, provider.GetCommand(c), true)
 		return
 	} else {
 
@@ -121,7 +119,7 @@ func executeCommand(c *Context, w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		chanChan := Srv.Store.Channel().Get(channelId)
+		chanChan := Srv.Store.Channel().Get(commandArgs.ChannelId)
 		teamChan := Srv.Store.Team().Get(c.TeamId)
 		userChan := Srv.Store.User().Get(c.Session.UserId)
 
@@ -166,7 +164,7 @@ func executeCommand(c *Context, w http.ResponseWriter, r *http.Request) {
 					p.Set("team_id", cmd.TeamId)
 					p.Set("team_domain", team.Name)
 
-					p.Set("channel_id", channelId)
+					p.Set("channel_id", commandArgs.ChannelId)
 					p.Set("channel_name", channel.Name)
 
 					p.Set("user_id", c.Session.UserId)
@@ -200,7 +198,7 @@ func executeCommand(c *Context, w http.ResponseWriter, r *http.Request) {
 							if response == nil {
 								c.Err = model.NewLocAppError("command", "api.command.execute_command.failed_empty.app_error", map[string]interface{}{"Trigger": trigger}, "")
 							} else {
-								handleResponse(c, w, response, channelId, cmd, false)
+								handleResponse(c, w, response, commandArgs, cmd, false)
 							}
 						} else {
 							defer resp.Body.Close()
@@ -219,10 +217,11 @@ func executeCommand(c *Context, w http.ResponseWriter, r *http.Request) {
 	c.Err = model.NewLocAppError("command", "api.command.execute_command.not_found.app_error", map[string]interface{}{"Trigger": trigger}, "")
 }
 
-func handleResponse(c *Context, w http.ResponseWriter, response *model.CommandResponse, channelId string, cmd *model.Command, builtIn bool) {
-
+func handleResponse(c *Context, w http.ResponseWriter, response *model.CommandResponse, commandArgs *model.CommandArgs, cmd *model.Command, builtIn bool) {
 	post := &model.Post{}
-	post.ChannelId = channelId
+	post.ChannelId = commandArgs.ChannelId
+	post.RootId = commandArgs.RootId
+	post.ParentId = commandArgs.ParentId
 
 	if !builtIn {
 		post.AddProp("from_webhook", "true")
@@ -258,6 +257,7 @@ func handleResponse(c *Context, w http.ResponseWriter, response *model.CommandRe
 		post.Message = response.Text
 		post.CreateAt = model.GetMillis()
 		post.UserId = c.Session.UserId
+		post.ParentId = ""
 		SendEphemeralPost(
 			c.TeamId,
 			c.Session.UserId,