Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/app/slashcommands/command_marketplace.go

@@ -0,0 +1,49 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app/request"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/i18n"
+)
+
+type MarketplaceProvider struct {
+}
+
+const (
+	CmdMarketplace = "marketplace"
+)
+
+func init() {
+	app.RegisterCommandProvider(&MarketplaceProvider{})
+}
+
+func (h *MarketplaceProvider) GetTrigger() string {
+	return CmdMarketplace
+}
+
+func (h *MarketplaceProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Command {
+	enabled := false
+	pluginSettings := a.Config().PluginSettings
+	if *pluginSettings.Enable && *pluginSettings.EnableMarketplace {
+		enabled = true
+	}
+
+	return &model.Command{
+		Trigger:          CmdMarketplace,
+		AutoComplete:     enabled,
+		AutoCompleteDesc: T("api.command_marketplace.desc"),
+		DisplayName:      T("api.command_marketplace.name"),
+	}
+}
+
+func (h *MarketplaceProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
+	// This command is handled client-side and shouldn't hit the server.
+	return &model.CommandResponse{
+		Text:         args.T("api.command_marketplace.unsupported.app_error"),
+		ResponseType: model.CommandResponseTypeEphemeral,
+	}
+}