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8968709642
* [SMTP] Add reliable email delivery with retry and database-backed queue Rework the SMTP client from fire-and-forget sending into a persistent queue with exponential backoff and per-message retry budget, backed by the existing database rows as the durable source of truth. - Keep pending emails in an in-memory queue with attempts/backoff tracking; enqueue without deleting database rows, and only remove the row once delivery is confirmed via the mailDelivered signal. - Add exponential backoff (doubling, capped at 30 min) between delivery attempts, bounded by new smtp/maxretries and smtp/retrydelay settings. - Track connection-layer failures (connect/auth/encrypt) with their own backoff; route failures to recordFailed/recordConnectionFailure so undeliverable mail eventually drops from the queue instead of retrying forever. - Treat rejected recipients/senders as permanent failures. - Rebuild the SMTP buffer from the authoritative queue before each send via a new QxtSmtp::reset() so reconnects never duplicate deliveries. - Start the idle timeout after authentication, not on TCP connect, so slow SSL/STARTTLS handshakes are not cut short. * [SMTP] Fix retry accounting, backoff reset, and token dedupe --------- Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
113 lines
3.5 KiB
C++
113 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) Qxt Foundation. Some rights reserved.
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**
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** This file is part of the QxtWeb module of the Qxt library.
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**
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** This library is free software; you can redistribute it and/or modify it
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** under the terms of the Common Public License, version 1.0, as published
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** by IBM, and/or under the terms of the GNU Lesser General Public License,
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** version 2.1, as published by the Free Software Foundation.
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**
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** This file is provided "AS IS", without WARRANTIES OR CONDITIONS OF ANY
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** KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY
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** WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR
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** FITNESS FOR A PARTICULAR PURPOSE.
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**
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** You should have received a copy of the CPL and the LGPL along with this
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** file. See the LICENSE file and the cpl1.0.txt/lgpl-2.1.txt files
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** included with the source distribution for more information.
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** If you did not receive a copy of the licenses, contact the Qxt Foundation.
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**
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** <http://libqxt.org> <foundation@libqxt.org>
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**
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****************************************************************************/
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#ifndef QXTSMTP_H
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#define QXTSMTP_H
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#include <QObject>
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#include <QHostAddress>
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#include <QString>
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#include "qxtglobal.h"
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#include "qxtmailmessage.h"
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class QTcpSocket;
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class QSslSocket;
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class QxtSmtpPrivate;
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class QXT_NETWORK_EXPORT QxtSmtp : public QObject
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{
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Q_OBJECT
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public:
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enum SmtpError
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{
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NoError,
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NoRecipients,
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CommandUnrecognized = 500,
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SyntaxError,
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CommandNotImplemented,
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BadSequence,
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ParameterNotImplemented,
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MailboxUnavailable = 550,
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UserNotLocal,
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MessageTooLarge,
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InvalidMailboxName,
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TransactionFailed
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};
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QxtSmtp(QObject* parent = 0);
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QByteArray username() const;
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void setUsername(const QByteArray& name);
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QByteArray password() const;
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void setPassword(const QByteArray& password);
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int send(const QxtMailMessage& message);
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int pendingMessages() const;
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void clearPending();
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void reset();
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QTcpSocket* socket() const;
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void connectToHost(const QString& hostName, quint16 port = 25);
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void connectToHost(const QHostAddress& address, quint16 port = 25);
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void disconnectFromHost();
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bool startTlsDisabled() const;
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void setStartTlsDisabled(bool disable);
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QSslSocket* sslSocket() const;
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void connectToSecureHost(const QString& hostName, quint16 port = 465);
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void connectToSecureHost(const QHostAddress& address, quint16 port = 465);
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bool hasExtension(const QString& extension);
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QString extensionData(const QString& extension);
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Q_SIGNALS:
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void connected();
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void connectionFailed();
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void connectionFailed( const QByteArray & msg );
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void encrypted();
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void encryptionFailed();
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void encryptionFailed( const QByteArray & msg );
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void authenticated();
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void authenticationFailed();
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void authenticationFailed( const QByteArray & msg );
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void senderRejected(int mailID, const QString& address );
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void senderRejected(int mailID, const QString& address, const QByteArray & msg );
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void recipientRejected(int mailID, const QString& address );
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void recipientRejected(int mailID, const QString& address, const QByteArray & msg );
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void mailFailed(int mailID, int errorCode);
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void mailFailed(int mailID, int errorCode, const QByteArray & msg);
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void mailSent(int mailID);
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void finished();
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void disconnected();
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private:
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QXT_DECLARE_PRIVATE(QxtSmtp)
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};
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#endif // QXTSMTP_H
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