193 lines
7.5 KiB
C#
193 lines
7.5 KiB
C#
/*
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*
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* (c) Copyright Ascensio System Limited 2010-2018
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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using System;
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using System.Configuration;
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using System.IO;
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using System.Linq;
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using System.Net.Mail;
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using System.Text;
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using System.Threading;
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using ASC.Common.Utils;
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using Amazon.SimpleEmail;
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using Amazon.SimpleEmail.Model;
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using log4net;
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namespace ASC.Common.Notify
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{
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public class AWSEmail
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{
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public enum SendStatus
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{
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Ok,
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Failed,
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QuotaLimit
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}
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private readonly AmazonSimpleEmailServiceClient _emailService;
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private readonly ILog _log = LogHolder.Log("ASC.Notify.AmazonSES");
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//Static fields
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private static readonly TimeSpan RefreshTimeout;
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private static DateTime _lastRefresh;
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private static DateTime _lastSend;
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private static TimeSpan _sendWindow = TimeSpan.MinValue;
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private static GetSendQuotaResult _quota;
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private static readonly object SynchRoot = new object();
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static AWSEmail()
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{
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RefreshTimeout = TimeSpan.FromMinutes(30);
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if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["ses.refreshTimeout"]))
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{
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TimeSpan.TryParse(ConfigurationManager.AppSettings["ses.refreshTimeout"], out RefreshTimeout);
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}
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_lastRefresh = DateTime.UtcNow - RefreshTimeout;//Set to refresh on first send
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}
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public AWSEmail()
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{
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var accessKey = ConfigurationManager.AppSettings["ses.accessKey"];
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var secretKey = ConfigurationManager.AppSettings["ses.secretKey"];
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_emailService = new AmazonSimpleEmailServiceClient(accessKey, secretKey);
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}
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public SendStatus SendEmail(MailMessage mailMessage)
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{
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//Check if we need to query stats
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RefreshQuotaIfNeeded();
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if (_quota != null)
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{
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lock (SynchRoot)
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{
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if (_quota.Max24HourSend <= _quota.SentLast24Hours)
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{
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//Quota exceeded
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//Queu next refresh to +24 hours
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_lastRefresh = DateTime.UtcNow.AddHours(24);
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_log.WarnFormat("quota limit reached. setting next check to: {0}", _lastRefresh);
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return SendStatus.QuotaLimit;
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}
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}
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}
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var destination = new Destination
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{
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ToAddresses = mailMessage.To.Select(adresses => adresses.Address).ToList(),
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BccAddresses = mailMessage.Bcc.Select(adresses => adresses.Address).ToList(),
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CcAddresses = mailMessage.CC.Select(adresses => adresses.Address).ToList(),
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};
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var body = new Body(new Content(mailMessage.Body) { Charset = Encoding.UTF8.WebName });
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if (mailMessage.AlternateViews.Count > 0)
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{
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//Get html body
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foreach (var alternateView in mailMessage.AlternateViews)
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{
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if ("text/html".Equals(alternateView.ContentType.MediaType, StringComparison.OrdinalIgnoreCase))
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{
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var stream = alternateView.ContentStream;
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var buf = new byte[stream.Length];
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stream.Read(buf, 0, buf.Length);
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stream.Seek(0, SeekOrigin.Begin);//NOTE:seek to begin to keep HTML body
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body.Html = new Content(Encoding.UTF8.GetString(buf)) { Charset = Encoding.UTF8.WebName };
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break;
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}
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}
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}
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var message = new Message(new Content(mailMessage.Subject), body);
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var seRequest = new SendEmailRequest(mailMessage.From.ToEncodedStringEx(), destination, message);
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if (mailMessage.ReplyTo != null)
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seRequest.ReplyToAddresses.Add(mailMessage.ReplyTo.Address);
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ThrottleIfNeeded();
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var response = _emailService.SendEmail(seRequest);
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_lastSend = DateTime.UtcNow;
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return response != null ? SendStatus.Ok : SendStatus.Failed;
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}
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private void ThrottleIfNeeded()
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{
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//Check last send and throttle if needed
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if (_sendWindow != TimeSpan.MinValue)
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{
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if (DateTime.UtcNow - _lastSend <= _sendWindow)
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//Possible BUG: at high frequncies maybe bug with to little differences
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{
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//This means that time passed from last send is less then message per second
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_log.DebugFormat("send rate doesn't fit in send window. sleeping for:{0}", _sendWindow);
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Thread.Sleep(_sendWindow);
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}
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}
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}
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private void RefreshQuotaIfNeeded()
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{
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if (!IsRefreshNeeded()) return;
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lock (SynchRoot)
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{
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if (IsRefreshNeeded())//Double check
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{
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_log.DebugFormat("refreshing qouta. interval: {0} Last refresh was at: {1}", RefreshTimeout,
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_lastRefresh);
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//Do quota refresh
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_lastRefresh = DateTime.UtcNow.AddMinutes(1);
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try
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{
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var quotaRequest = new GetSendQuotaRequest();
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_quota = _emailService.GetSendQuota(quotaRequest).GetSendQuotaResult;
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_sendWindow = TimeSpan.FromSeconds(1.0 / _quota.MaxSendRate);
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_log.DebugFormat("quota: {0}/{1} at {2} mps. send window:{3}", _quota.SentLast24Hours,
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_quota.Max24HourSend, _quota.MaxSendRate, _sendWindow);
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}
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catch (Exception e)
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{
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_log.Error("error refreshing quota", e);
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}
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}
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}
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}
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private static bool IsRefreshNeeded()
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{
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return (DateTime.UtcNow - _lastRefresh) > RefreshTimeout || _quota == null;
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}
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}
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}
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