Custom status feature (#16835)

* Create the system console setting and send to webapp

* MI-1145: Add custom status APIs

* MI-1145 Add slash commands to set and clear status

* Add validation for custom status API

* Trim custom status message

* Code refactoring

- Run gofmt

- Rename constants

* Remove sendUserUpdated webhook event

* Fix recent custom status length

* Update error conditions

* Disable /status slash command when config setting is off

* MI-1155: Create the feature flag for custom status APIs and slash commands

* Move recent custom statuses to user preferences (#7)

* Move recent custom statuses to user preferences

* Code refactoring and feedback changes

* Update slash command text and emoji regex

* Make the custom status feature flag off by default

* Update SetCustomStatus, handle recents not set better

* Update status codes

* Update slash command handling

* Add telementry settings

* Fix i18n order

* Revert "Fix i18n order"

This reverts commit 499f7eaca8180336f5bcca360cc0133365899e08.

* Update i18n strings

app/slashcommands/command_custom_status.go

@@ -0,0 +1,85 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"strings"
+
+	goi18n "github.com/mattermost/go-i18n/i18n"
+
+	"github.com/mattermost/mattermost-server/v5/app"
+	"github.com/mattermost/mattermost-server/v5/mlog"
+	"github.com/mattermost/mattermost-server/v5/model"
+)
+
+type CustomStatusProvider struct {
+}
+
+const (
+	CmdCustomStatus      = app.CmdCustomStatusTrigger
+	CmdCustomStatusClear = "clear"
+
+	DefaultCustomStatusEmoji = "speech_balloon"
+)
+
+func init() {
+	app.RegisterCommandProvider(&CustomStatusProvider{})
+}
+
+func (*CustomStatusProvider) GetTrigger() string {
+	return CmdCustomStatus
+}
+
+func (*CustomStatusProvider) GetCommand(a *app.App, T goi18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CmdCustomStatus,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_custom_status.desc"),
+		AutoCompleteHint: T("api.command_custom_status.hint"),
+		DisplayName:      T("api.command_custom_status.name"),
+	}
+}
+
+func (*CustomStatusProvider) DoCommand(a *app.App, args *model.CommandArgs, message string) *model.CommandResponse {
+	if !a.Config().FeatureFlags.CustomUserStatuses || !*a.Config().TeamSettings.EnableCustomUserStatuses {
+		return nil
+	}
+
+	if message == CmdCustomStatusClear {
+		if err := a.RemoveCustomStatus(args.UserId); err != nil {
+			mlog.Error(err.Error())
+			return &model.CommandResponse{Text: args.T("api.command_custom_status.clear.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+		}
+
+		return &model.CommandResponse{
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+			Text:         args.T("api.command_custom_status.clear.success"),
+		}
+	}
+
+	customStatus := &model.CustomStatus{
+		Emoji: DefaultCustomStatusEmoji,
+		Text:  message,
+	}
+	firstEmojiLocations := model.ALL_EMOJI_PATTERN.FindIndex([]byte(message))
+	if len(firstEmojiLocations) > 0 && firstEmojiLocations[0] == 0 {
+		// emoji found at starting index
+		customStatus.Emoji = message[firstEmojiLocations[0]+1 : firstEmojiLocations[1]-1]
+		customStatus.Text = strings.TrimSpace(message[firstEmojiLocations[1]:])
+	}
+
+	customStatus.TrimMessage()
+	if err := a.SetCustomStatus(args.UserId, customStatus); err != nil {
+		mlog.Error(err.Error())
+		return &model.CommandResponse{Text: args.T("api.command_custom_status.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	return &model.CommandResponse{
+		ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		Text: args.T("api.command_custom_status.success", map[string]interface{}{
+			"EmojiName":     ":" + customStatus.Emoji + ":",
+			"StatusMessage": customStatus.Text,
+		}),
+	}
+}