326 lines
11 KiB
C#
326 lines
11 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.Core.Notify.Senders;
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[Singletone]
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public class SmtpSender : INotifySender
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{
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protected ILogger _logger;
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private IDictionary<string, string> _initProperties;
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protected readonly IConfiguration _configuration;
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protected IServiceProvider _serviceProvider;
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private string _host;
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private int _port;
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private bool _ssl;
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private ICredentials _credentials;
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protected bool _useCoreSettings;
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const int NetworkTimeout = 30000;
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public SmtpSender(
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IConfiguration configuration,
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IServiceProvider serviceProvider,
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ILoggerProvider options)
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{
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_initProperties = new Dictionary<string, string>();
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_logger = options.CreateLogger("ASC.Notify");
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_configuration = configuration;
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_serviceProvider = serviceProvider;
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}
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public virtual void Init(IDictionary<string, string> properties)
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{
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_initProperties = properties;
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}
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public virtual NoticeSendResult Send(NotifyMessage m)
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{
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using var scope = _serviceProvider.CreateScope();
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var tenantManager = scope.ServiceProvider.GetService<TenantManager>();
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tenantManager.SetCurrentTenant(m.TenantId);
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var configuration = scope.ServiceProvider.GetService<CoreConfiguration>();
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var smtpClient = GetSmtpClient();
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var result = NoticeSendResult.TryOnceAgain;
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try
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{
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try
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{
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BuildSmtpSettings(configuration);
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var mail = BuildMailMessage(m);
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_logger.DebugSmtpSender(_host, _port, _ssl, _credentials != null);
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smtpClient.Connect(_host, _port,
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_ssl ? SecureSocketOptions.Auto : SecureSocketOptions.None);
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if (_credentials != null)
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{
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smtpClient.Authenticate(_credentials);
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}
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smtpClient.Send(mail);
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result = NoticeSendResult.OK;
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}
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catch (Exception e)
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{
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_logger.ErrorSend(m.TenantId, m.Reciever, e);
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throw;
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}
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}
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catch (ObjectDisposedException)
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{
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result = NoticeSendResult.SendingImpossible;
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}
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catch (InvalidOperationException)
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{
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result = string.IsNullOrEmpty(_host) || _port == 0
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? NoticeSendResult.SendingImpossible
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: NoticeSendResult.TryOnceAgain;
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}
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catch (IOException)
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{
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result = NoticeSendResult.TryOnceAgain;
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}
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catch (MailKit.Net.Smtp.SmtpProtocolException)
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{
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result = NoticeSendResult.SendingImpossible;
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}
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catch (MailKit.Net.Smtp.SmtpCommandException e)
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{
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switch (e.StatusCode)
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{
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case MailKit.Net.Smtp.SmtpStatusCode.MailboxBusy:
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case MailKit.Net.Smtp.SmtpStatusCode.MailboxUnavailable:
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case MailKit.Net.Smtp.SmtpStatusCode.ExceededStorageAllocation:
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result = NoticeSendResult.TryOnceAgain;
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break;
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case MailKit.Net.Smtp.SmtpStatusCode.MailboxNameNotAllowed:
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case MailKit.Net.Smtp.SmtpStatusCode.UserNotLocalWillForward:
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case MailKit.Net.Smtp.SmtpStatusCode.UserNotLocalTryAlternatePath:
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result = NoticeSendResult.MessageIncorrect;
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break;
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default:
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if (e.StatusCode != MailKit.Net.Smtp.SmtpStatusCode.Ok)
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{
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result = NoticeSendResult.TryOnceAgain;
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}
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break;
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}
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}
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catch (Exception)
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{
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result = NoticeSendResult.SendingImpossible;
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}
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finally
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{
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if (smtpClient.IsConnected)
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{
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smtpClient.Disconnect(true);
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}
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smtpClient.Dispose();
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}
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return result;
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}
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private void BuildSmtpSettings(CoreConfiguration configuration)
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{
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if (configuration.SmtpSettings.IsDefaultSettings && _initProperties.ContainsKey("host") && !string.IsNullOrEmpty(_initProperties["host"]))
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{
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_host = _initProperties["host"];
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if (_initProperties.ContainsKey("port") && !string.IsNullOrEmpty(_initProperties["port"]))
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{
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_port = int.Parse(_initProperties["port"]);
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}
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else
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{
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_port = 25;
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}
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if (_initProperties.ContainsKey("enableSsl") && !string.IsNullOrEmpty(_initProperties["enableSsl"]))
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{
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_ssl = bool.Parse(_initProperties["enableSsl"]);
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}
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else
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{
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_ssl = false;
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}
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if (_initProperties.ContainsKey("userName"))
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{
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_credentials = new NetworkCredential(
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_initProperties["userName"],
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_initProperties["password"]);
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}
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}
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else
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{
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var s = configuration.SmtpSettings;
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_host = s.Host;
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_port = s.Port;
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_ssl = s.EnableSSL;
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_credentials = !string.IsNullOrEmpty(s.CredentialsUserName)
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? new NetworkCredential(s.CredentialsUserName, s.CredentialsUserPassword)
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: null;
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}
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}
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private MimeMessage BuildMailMessage(NotifyMessage m)
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{
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var mimeMessage = new MimeMessage
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{
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Subject = m.Subject
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};
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var fromAddress = MailboxAddress.Parse(ParserOptions.Default, m.Sender);
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mimeMessage.From.Add(fromAddress);
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foreach (var to in m.Reciever.Split(new[] { '|' }, StringSplitOptions.RemoveEmptyEntries))
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{
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mimeMessage.To.Add(MailboxAddress.Parse(ParserOptions.Default, to));
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}
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if (m.ContentType == Pattern.HtmlContentType)
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{
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var textPart = new TextPart("plain")
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{
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Text = HtmlUtil.GetText(m.Content),
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ContentTransferEncoding = ContentEncoding.QuotedPrintable
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};
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var multipartAlternative = new MultipartAlternative { textPart };
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var htmlPart = new TextPart("html")
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{
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Text = GetHtmlView(m.Content),
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ContentTransferEncoding = ContentEncoding.QuotedPrintable
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};
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if (m.Attachments != null && m.Attachments.Length > 0)
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{
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var multipartRelated = new MultipartRelated
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{
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Root = htmlPart
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};
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foreach (var attachment in m.Attachments)
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{
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var mimeEntity = ConvertAttachmentToMimePart(attachment);
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if (mimeEntity != null)
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{
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multipartRelated.Add(mimeEntity);
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}
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}
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multipartAlternative.Add(multipartRelated);
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}
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else
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{
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multipartAlternative.Add(htmlPart);
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}
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mimeMessage.Body = multipartAlternative;
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}
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else
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{
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mimeMessage.Body = new TextPart("plain")
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{
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Text = m.Content,
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ContentTransferEncoding = ContentEncoding.QuotedPrintable
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};
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}
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if (!string.IsNullOrEmpty(m.ReplyTo))
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{
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mimeMessage.ReplyTo.Add(MailboxAddress.Parse(ParserOptions.Default, m.ReplyTo));
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}
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mimeMessage.Headers.Add("Auto-Submitted", string.IsNullOrEmpty(m.AutoSubmitted) ? "auto-generated" : m.AutoSubmitted);
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return mimeMessage;
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}
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protected string GetHtmlView(string body)
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{
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return $@"<!DOCTYPE html PUBLIC ""-//W3C//DTD HTML 4.01 Transitional//EN"">
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<html>
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<head>
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<meta content=""text/html;charset=UTF-8"" http-equiv=""Content-Type"">
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</head>
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<body>{body}</body>
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</html>";
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}
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private MailKit.Net.Smtp.SmtpClient GetSmtpClient()
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{
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var smtpClient = new MailKit.Net.Smtp.SmtpClient
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{
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Timeout = NetworkTimeout
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};
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return smtpClient;
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}
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private static MimePart ConvertAttachmentToMimePart(NotifyMessageAttachment attachment)
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{
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try
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{
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if (attachment == null || string.IsNullOrEmpty(attachment.FileName) || string.IsNullOrEmpty(attachment.ContentId) || attachment.Content == null)
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{
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return null;
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}
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var extension = Path.GetExtension(attachment.FileName);
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if (string.IsNullOrEmpty(extension))
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{
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return null;
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}
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return new MimePart("image", extension.TrimStart('.'))
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{
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ContentId = attachment.ContentId,
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Content = new MimeContent(new MemoryStream(attachment.Content)),
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ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
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ContentTransferEncoding = ContentEncoding.Base64,
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FileName = attachment.FileName
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};
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}
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catch (Exception)
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{
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return null;
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}
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}
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}
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