Added API to return user count bands and user count (#25796)

server/channels/app/limits.go

@@ -0,0 +1,42 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package app
+
+import (
+	"net/http"
+
+	"github.com/mattermost/mattermost/server/public/model"
+)
+
+const (
+	lowerBandUsersLimit = 500
+	upperBandUsersLimit = 9000
+	maxUsersLimit       = 10000
+)
+
+func (a *App) GetUserLimits() (*model.UserLimits, *model.AppError) {
+	if !a.shouldShowUserLimits() {
+		return &model.UserLimits{}, nil
+	}
+
+	activeUserCount, appErr := a.Srv().Store().User().Count(model.UserCountOptions{})
+	if appErr != nil {
+		return nil, model.NewAppError("GetUsersLimits", "app.limits.get_user_limits.user_count.store_error", nil, "", http.StatusInternalServerError).Wrap(appErr)
+	}
+
+	return &model.UserLimits{
+		ActiveUserCount:    activeUserCount,
+		LowerBandUserLimit: lowerBandUsersLimit,
+		UpperBandUserLimit: upperBandUsersLimit,
+		MaxUsersLimit:      maxUsersLimit,
+	}, nil
+}
+
+func (a *App) shouldShowUserLimits() bool {
+	if maxUsersLimit == 0 {
+		return false
+	}
+
+	return a.License() == nil
+}