File indexing completed on 2024-06-23 05:21:16

 /* Copyright (C) 2006 - 2014 Jan Kundrát <jkt@flaska.net>
 
    This file is part of the Trojita Qt IMAP e-mail client,
    http://trojita.flaska.net/
 
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of
    the License or (at your option) version 3 or any later version
    accepted by the membership of KDE e.V. (or its successor approved
    by the membership of KDE e.V.), which shall act as a proxy
    defined in Section 14 of version 3 of the license.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 
 #include "UnSelectTask.h"
 #include <QUuid>
 #include "Imap/Model/Model.h"
 #include "Imap/Model/MailboxTree.h"
 #include "KeepMailboxOpenTask.h"
 
 namespace Imap
 {
 namespace Mailbox
 {
 
 UnSelectTask::UnSelectTask(Model *model, ImapTask *parentTask) :
     ImapTask(model)
 {
     conn = parentTask;
     parser = conn->parser;
     Q_ASSERT(parser);
     connect(this, &ImapTask::completed, this, &UnSelectTask::resetConnectionState);
 }
 
 void UnSelectTask::perform()
 {
     markAsActiveTask(TASK_PREPEND);
 
     if (_dead) {
         _failed(tr("Asked to die"));
         return;
     }
     // We really should ignore abort() -- we're a very important task
 
     if (model->accessParser(parser).maintainingTask) {
         model->accessParser(parser).maintainingTask->breakOrCancelPossibleIdle();
     }
     if (model->accessParser(parser).capabilities.contains(QStringLiteral("UNSELECT"))) {
         unSelectTag = parser->unSelect();
     } else {
         doFakeSelect();
     }
 }
 
 void UnSelectTask::doFakeSelect()
 {
     if (_dead) {
         _failed(tr("Asked to die"));
         return;
     }
     // Again, ignoring abort()
 
     if (model->accessParser(parser).maintainingTask) {
         model->accessParser(parser).maintainingTask->breakOrCancelPossibleIdle();
     }
     // The server does not support UNSELECT. Let's construct an unlikely-to-exist mailbox, then.
     selectMissingTag = parser->examine(QLatin1String("trojita non existing ") + QUuid::createUuid().toString());
 }
 
 bool UnSelectTask::handleStateHelper(const Imap::Responses::State *const resp)
 {
     if (resp->tag.isEmpty()) {
         switch (resp->respCode) {
         case Responses::UNSEEN:
         case Responses::PERMANENTFLAGS:
         case Responses::UIDNEXT:
         case Responses::UIDVALIDITY:
         case Responses::NOMODSEQ:
         case Responses::HIGHESTMODSEQ:
         case Responses::CLOSED:
             return true;
         default:
             break;
         }
     }
     if (!resp->tag.isEmpty()) {
         if (resp->tag == unSelectTag) {
             if (resp->kind == Responses::OK) {
                 // nothing should be needed here
                 _completed();
             } else {
                 // This is really bad.
                 throw MailboxException("Attempted to unselect current mailbox, but the server denied our request. "
                                        "Can't continue, to avoid possible data corruption.", *resp);
             }
             return true;
         } else if (resp->tag == selectMissingTag) {
             if (resp->kind == Responses::OK) {
                 QTimer::singleShot(0, this, SLOT(doFakeSelect()));
                 log(QStringLiteral("The emergency EXAMINE command has unexpectedly succeeded, trying to get out of here..."), Common::LOG_MAILBOX_SYNC);
             } else {
                 // This is very good :)
                 _completed();
             }
             return true;
         }
     }
     return false;
 }
 
 bool UnSelectTask::handleNumberResponse(const Imap::Responses::NumberResponse *const resp)
 {
     Q_UNUSED(resp);
     log(QStringLiteral("UnSelectTask: ignoring numeric response"), Common::LOG_MAILBOX_SYNC);
     return true;
 }
 
 bool UnSelectTask::handleFlags(const Imap::Responses::Flags *const resp)
 {
     Q_UNUSED(resp);
     log(QStringLiteral("UnSelectTask: ignoring FLAGS response"), Common::LOG_MAILBOX_SYNC);
     return true;
 }
 
 bool UnSelectTask::handleSearch(const Imap::Responses::Search *const resp)
 {
     Q_UNUSED(resp);
     log(QStringLiteral("UnSelectTask: ignoring SEARCH response"), Common::LOG_MAILBOX_SYNC);
     return true;
 }
 
 bool UnSelectTask::handleFetch(const Imap::Responses::Fetch *const resp)
 {
     Q_UNUSED(resp);
     log(QStringLiteral("UnSelectTask: ignoring FETCH response"), Common::LOG_MAILBOX_SYNC);
     return true;
 }
 
 /** @short Internal task */
 QVariant UnSelectTask::taskData(const int role) const
 {
     Q_UNUSED(role);
     return QVariant();
 }
 
 /** @short Reset the "waiting for [CLOSED]" state */
 void UnSelectTask::resetConnectionState()
 {
     auto const state = model->accessParser(parser).connState;
     if (state > CONN_STATE_AUTHENTICATED && state < CONN_STATE_LOGOUT) {
         model->changeConnectionState(parser, CONN_STATE_AUTHENTICATED);
     }
 }
 
 }
 }