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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
****************************************************************************/
#include <qglobal.h>
#if QT_CONFIG(topleveldomain)
#include "qplatformdefs.h"
#include "qurl.h"
#include "private/qurltlds_p.h"
#include "private/qtldurl_p.h"
#include "QtCore/qstring.h"
#include "QtCore/qvector.h"
QT_BEGIN_NAMESPACE
enum TLDMatchType {
ExactMatch,
SuffixMatch,
ExceptionMatch,
};
// Scan the auto-generated table of TLDs for an entry. For more details
// see comments in file: util/corelib/qurl-generateTLDs/main.cpp
static bool containsTLDEntry(QStringView entry, TLDMatchType match)
{
const QStringView matchSymbols[] = {
u"",
u"*",
u"!",
};
const auto symbol = matchSymbols[match];
const int index = qt_hash(entry, qt_hash(symbol)) % tldCount;
// select the right chunk from the big table
short chunk = 0;
uint chunkIndex = tldIndices[index], offset = 0;
// The offset in the big string, of the group that our entry hashes into.
const auto tldGroupOffset = tldIndices[index];
// It should always be inside all chunks' total size.
Q_ASSERT(tldGroupOffset < tldChunks[tldChunkCount - 1]);
// All offsets are stored in non-decreasing order.
// This check is within bounds as tldIndices has length tldCount+1.
Q_ASSERT(tldGroupOffset <= tldIndices[index + 1]);
// The last extra entry in tldIndices
// should be equal to the total of all chunks' lengths.
Q_ASSERT(tldIndices[tldCount] == tldChunks[tldChunkCount - 1]);
// Find which chunk contains the tldGroupOffset
while (tldGroupOffset >= tldChunks[chunk]) {
chunkIndex -= tldChunks[chunk];
offset += tldChunks[chunk];
chunk++;
// We can not go above the number of chunks we have, since all our
// indices are less than the total chunks' size (see asserts above).
Q_ASSERT(chunk < tldChunkCount);
}
// check all the entries from the given offset
while (chunkIndex < tldIndices[index+1] - offset) {
const auto utf8 = tldData[chunk] + chunkIndex;
if ((symbol.isEmpty() || QLatin1Char(*utf8) == symbol) && entry == QString::fromUtf8(utf8 + symbol.size()))
return true;
chunkIndex += qstrlen(utf8) + 1; // +1 for the ending \0
}
return false;
}
/*!
\internal
Return the top-level-domain per Qt's copy of the Mozilla public suffix list of
\a domain.
*/
Q_CORE_EXPORT QString qTopLevelDomain(const QString &domain)
{
const QString domainLower = domain.toLower();
QVector<QStringRef> sections = domainLower.splitRef(QLatin1Char('.'), Qt::SkipEmptyParts);
if (sections.isEmpty())
return QString();
QString level, tld;
for (int j = sections.count() - 1; j >= 0; --j) {
level.prepend(QLatin1Char('.') + sections.at(j));
if (qIsEffectiveTLD(level.rightRef(level.size() - 1)))
tld = level;
}
return tld;
}
/*!
\internal
Return true if \a domain is a top-level-domain per Qt's copy of the Mozilla public suffix list.
*/
Q_CORE_EXPORT bool qIsEffectiveTLD(const QStringRef &domain)
{
// for domain 'foo.bar.com':
// 1. return if TLD table contains 'foo.bar.com'
// 2. else if table contains '*.bar.com',
// 3. test that table does not contain '!foo.bar.com'
if (containsTLDEntry(domain, ExactMatch)) // 1
return true;
const int dot = domain.indexOf(QLatin1Char('.'));
if (dot < 0) // Actual TLD: may be effective if the subject of a wildcard rule:
return containsTLDEntry(QString(QLatin1Char('.') + domain), SuffixMatch);
if (containsTLDEntry(domain.mid(dot), SuffixMatch)) // 2
return !containsTLDEntry(domain, ExceptionMatch); // 3
return false;
}
QT_END_NAMESPACE
#endif
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