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/*
* qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "threadcidmap.h"
#include "cidschemehandler.h"
namespace {
/// Removes '!' from a prefix without ever mapping two distinct prefixes onto
/// one another.
///
/// A plain replace of '!' with '_' is NOT safe here: "m0!x" and "m0_x" would
/// both become "m0_x", merging two messages into one key space, which is
/// precisely the collision the namespacing exists to prevent. Escaping the
/// escape character first keeps the transform injective: '_' doubles, and '!'
/// becomes "_x", so no output is reachable from two different inputs.
QString sanitizePrefix(const QString &prefix)
{
if (!prefix.contains(QLatin1Char('!')) && !prefix.contains(QLatin1Char('_')))
return prefix;
QString result;
result.reserve(prefix.size() + 4);
for (const QChar c : prefix) {
if (c == QLatin1Char('_'))
result += QLatin1String("__");
else if (c == QLatin1Char('!'))
result += QLatin1String("_x");
else
result += c;
}
return result;
}
} // namespace
ThreadCidMap buildThreadCidMap(const QList<ThreadRenderItem> &items)
{
ThreadCidMap map;
for (const ThreadRenderItem &item : items) {
const QString prefix = sanitizePrefix(item.cidPrefix);
for (auto it = item.message.inlineParts.cbegin();
it != item.message.inlineParts.cend(); ++it) {
const QString key = CidSchemeHandler::namespacedKey(prefix, it.key());
map.parts.insert(key, it.value());
map.allowedCids.insert(key);
}
}
return map;
}
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