DocSpace-client/common/ASC.Core.Common/Configuration/AmiPublicDnsSyncService.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
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 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
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*/

namespace ASC.Core.Configuration
{
    public class AmiPublicDnsSyncService : IServiceController
    {
        public static IServiceProvider ServiceProvider { get; set; }
        public void Start()
        {
            Synchronize();
        }

        public void Stop()
        {

        }

        public static void Synchronize()
        {
            using var scope = ServiceProvider.CreateScope();
            var scopeClass = scope.ServiceProvider.GetService<AmiPublicDnsSyncServiceScope>();
            var (tenantManager, coreBaseSettings, clientFactory) = scopeClass;
            if (coreBaseSettings.Standalone)
            {
                var tenants = tenantManager.GetTenants(false).Where(t => MappedDomainNotSettedByUser(t.MappedDomain));
                if (tenants.Any())
                {
                    var dnsname = GetAmiPublicDnsName(clientFactory);
                    foreach (var tenant in tenants.Where(t => !string.IsNullOrEmpty(dnsname) && t.MappedDomain != dnsname))
                    {
                        tenant.MappedDomain = dnsname;
                        tenantManager.SaveTenant(tenant);
                    }
                }
            }
        }

        private static bool MappedDomainNotSettedByUser(string domain)
        {
            return string.IsNullOrEmpty(domain) || Regex.IsMatch(domain, "^ec2.+\\.compute\\.amazonaws\\.com$", RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
        }

        private static string GetAmiPublicDnsName(IHttpClientFactory clientFactory)
        {
            try
            {
                var request = new HttpRequestMessage();
                request.RequestUri = new Uri("http://169.254.169.254/latest/meta-data/public-hostname");
                request.Method = HttpMethod.Get;

                var httpClient = clientFactory.CreateClient();
                httpClient.Timeout = TimeSpan.FromMilliseconds(5000);

                using var responce = httpClient.Send(request);
                using var stream = responce.Content.ReadAsStream();
                using var reader = new StreamReader(stream);
                return reader.ReadToEnd();
            }
            catch (HttpRequestException ex)
            {
                if (ex.StatusCode == HttpStatusCode.NotFound || ex.StatusCode == HttpStatusCode.Conflict)
                {
                    throw;
                }
            }
            return null;
        }
    }

    public class AmiPublicDnsSyncServiceScope
    {
        private TenantManager TenantManager { get; }
        private CoreBaseSettings CoreBaseSettings { get; }
        private IHttpClientFactory ClientFactory { get; }

        public AmiPublicDnsSyncServiceScope(TenantManager tenantManager, CoreBaseSettings coreBaseSettings, IHttpClientFactory clientFactory)
        {
            TenantManager = tenantManager;
            CoreBaseSettings = coreBaseSettings;
            ClientFactory = clientFactory;
        }

        public void Deconstruct(out TenantManager tenantManager, out CoreBaseSettings coreBaseSettings, out IHttpClientFactory clientFactory)
        {
            (tenantManager, coreBaseSettings, clientFactory) = (TenantManager, CoreBaseSettings, ClientFactory);
        }
    }
}