PLT-1649: add response_url support for custom slash commands (#6739)

* add response_url support for custom slash commands

* pr suggestions

* pr update / suggestion

* test fix

app/command.go

@@ -45,10 +45,9 @@ func CreateCommandPost(post *model.Post, teamId string, response *model.CommandR
 		parseSlackAttachment(post, response.Attachments)
 	}
 
-	switch response.ResponseType {
-	case model.COMMAND_RESPONSE_TYPE_IN_CHANNEL:
+	if response.ResponseType == model.COMMAND_RESPONSE_TYPE_IN_CHANNEL {
 		return CreatePost(post, teamId, true)
-	case model.COMMAND_RESPONSE_TYPE_EPHEMERAL:
+	} else if response.ResponseType == "" || response.ResponseType == model.COMMAND_RESPONSE_TYPE_EPHEMERAL {
 		if response.Text == "" {
 			return post, nil
 		}
@@ -196,7 +195,12 @@ func ExecuteCommand(args *model.CommandArgs) (*model.CommandResponse, *model.App
 
 					p.Set("command", "/"+trigger)
 					p.Set("text", message)
-					p.Set("response_url", "not supported yet")
+
+					if hook, err := CreateCommandWebhook(cmd.Id, args); err != nil {
+						return nil, model.NewAppError("command", "api.command.execute_command.failed.app_error", map[string]interface{}{"Trigger": trigger}, err.Error(), http.StatusInternalServerError)
+					} else {
+						p.Set("response_url", args.SiteURL+"/hooks/commands/"+hook.Id)
+					}
 
 					method := "POST"
 					if cmd.Method == model.COMMAND_METHOD_GET {
@@ -213,7 +217,7 @@ func ExecuteCommand(args *model.CommandArgs) (*model.CommandResponse, *model.App
 						return nil, model.NewAppError("command", "api.command.execute_command.failed.app_error", map[string]interface{}{"Trigger": trigger}, err.Error(), http.StatusInternalServerError)
 					} else {
 						if resp.StatusCode == http.StatusOK {
-							response := model.CommandResponseFromJson(resp.Body)
+							response := model.CommandResponseFromHTTPBody(resp.Header.Get("Content-Type"), resp.Body)
 							if response == nil {
 								return nil, model.NewAppError("command", "api.command.execute_command.failed_empty.app_error", map[string]interface{}{"Trigger": trigger}, "", http.StatusInternalServerError)
 							} else {

app/webhook.go

@@ -533,3 +533,54 @@ func HandleIncomingWebhook(hookId string, req *model.IncomingWebhookRequest) *mo
 
 	return nil
 }
+
+func CreateCommandWebhook(commandId string, args *model.CommandArgs) (*model.CommandWebhook, *model.AppError) {
+	hook := &model.CommandWebhook{
+		CommandId: commandId,
+		UserId:    args.UserId,
+		ChannelId: args.ChannelId,
+		RootId:    args.RootId,
+		ParentId:  args.ParentId,
+	}
+
+	if result := <-Srv.Store.CommandWebhook().Save(hook); result.Err != nil {
+		return nil, result.Err
+	} else {
+		return result.Data.(*model.CommandWebhook), nil
+	}
+}
+
+func HandleCommandWebhook(hookId string, response *model.CommandResponse) *model.AppError {
+	if response == nil {
+		return model.NewAppError("HandleCommandWebhook", "web.command_webhook.parse.app_error", nil, "", http.StatusBadRequest)
+	}
+
+	var hook *model.CommandWebhook
+	if result := <-Srv.Store.CommandWebhook().Get(hookId); result.Err != nil {
+		return model.NewAppError("HandleCommandWebhook", "web.command_webhook.invalid.app_error", nil, "err="+result.Err.Message, result.Err.StatusCode)
+	} else {
+		hook = result.Data.(*model.CommandWebhook)
+	}
+
+	var cmd *model.Command
+	if result := <-Srv.Store.Command().Get(hook.CommandId); result.Err != nil {
+		return model.NewAppError("HandleCommandWebhook", "web.command_webhook.command.app_error", nil, "err="+result.Err.Message, http.StatusBadRequest)
+	} else {
+		cmd = result.Data.(*model.Command)
+	}
+
+	args := &model.CommandArgs{
+		UserId:    hook.UserId,
+		ChannelId: hook.ChannelId,
+		TeamId:    cmd.TeamId,
+		RootId:    hook.RootId,
+		ParentId:  hook.ParentId,
+	}
+
+	if result := <-Srv.Store.CommandWebhook().TryUse(hook.Id, 5); result.Err != nil {
+		return model.NewAppError("HandleCommandWebhook", "web.command_webhook.invalid.app_error", nil, "err="+result.Err.Message, result.Err.StatusCode)
+	}
+
+	_, err := HandleCommandResponse(cmd, args, response, false)
+	return err
+}