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/******************************************************************************
* Copyright (C) 2018 Kitsune Ral <kitsune-ral@users.sf.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "util.h"
#include <QtCore/QCryptographicHash>
#include <QtCore/QDataStream>
#include <QtCore/QDir>
#include <QtCore/QRegularExpression>
#include <QtCore/QStandardPaths>
#include <QtCore/QStringBuilder>
#include <QtCore/QtEndian>
static const auto RegExpOptions =
QRegularExpression::CaseInsensitiveOption
#if QT_VERSION < QT_VERSION_CHECK(5, 12, 0)
| QRegularExpression::OptimizeOnFirstUsageOption // Default since 5.12
#endif
| QRegularExpression::UseUnicodePropertiesOption;
// Converts all that looks like a URL into HTML links
void Quotient::linkifyUrls(QString& htmlEscapedText)
{
// Note: outer parentheses are a part of C++ raw string delimiters, not of
// the regex (see http://en.cppreference.com/w/cpp/language/string_literal).
// Note2: the next-outer parentheses are \N in the replacement.
// generic url:
// regexp is originally taken from Konsole (https://github.com/KDE/konsole)
// protocolname:// or www. followed by anything other than whitespaces,
// <, >, ' or ", and ends before whitespaces, <, >, ', ", ], !, ), :,
// comma or dot
static const QRegularExpression FullUrlRegExp(
QStringLiteral(
R"(\b((www\.(?!\.)(?!(\w|\.|-)+@)|(https?|ftp|magnet|matrix):(//)?)(&(?![lg]t;)|[^&\s<>'"])+(&(?![lg]t;)|[^&!,.\s<>'"\]):])))"),
RegExpOptions);
// email address:
// [word chars, dots or dashes]@[word chars, dots or dashes].[word chars]
static const QRegularExpression EmailAddressRegExp(
QStringLiteral(R"(\b(mailto:)?((\w|\.|-)+@(\w|\.|-)+\.\w+\b))"),
RegExpOptions);
// An interim liberal implementation of
// https://matrix.org/docs/spec/appendices.html#identifier-grammar
static const QRegularExpression MxIdRegExp(
QStringLiteral(
R"((^|[^<>/])([!#@][-a-z0-9_=#/.]{1,252}:(?:\w|\.|-)+\.\w+(?::\d{1,5})?))"),
RegExpOptions);
Q_ASSERT(FullUrlRegExp.isValid() && EmailAddressRegExp.isValid()
&& MxIdRegExp.isValid());
// NOTE: htmlEscapedText is already HTML-escaped! No literal <,>,&,"
htmlEscapedText.replace(EmailAddressRegExp,
QStringLiteral(R"(<a href="mailto:\2">\1\2</a>)"));
htmlEscapedText.replace(FullUrlRegExp,
QStringLiteral(R"(<a href="\1">\1</a>)"));
htmlEscapedText.replace(
MxIdRegExp,
QStringLiteral(R"(\1<a href="https://matrix.to/#/\2">\2</a>)"));
}
QString Quotient::sanitized(const QString& plainText)
{
auto text = plainText;
text.remove(QChar(0x202e)); // RLO
text.remove(QChar(0x202d)); // LRO
text.remove(QChar(0xfffc)); // Object replacement character
return text;
}
QString Quotient::prettyPrint(const QString& plainText)
{
auto pt = plainText.toHtmlEscaped();
linkifyUrls(pt);
pt.replace('\n', QStringLiteral("<br/>"));
return QStringLiteral("<span style='white-space:pre-wrap'>") + pt
+ QStringLiteral("</span>");
}
QString Quotient::cacheLocation(const QString& dirName)
{
const QString cachePath =
QStandardPaths::writableLocation(QStandardPaths::CacheLocation) % '/'
% dirName % '/';
QDir dir;
if (!dir.exists(cachePath))
dir.mkpath(cachePath);
return cachePath;
}
qreal Quotient::stringToHueF(const QString& s)
{
Q_ASSERT(!s.isEmpty());
QByteArray hash = QCryptographicHash::hash(s.toUtf8(),
QCryptographicHash::Sha1);
QDataStream dataStream(hash.left(2));
dataStream.setByteOrder(QDataStream::LittleEndian);
quint16 hashValue;
dataStream >> hashValue;
const auto hueF = qreal(hashValue) / std::numeric_limits<quint16>::max();
Q_ASSERT((0 <= hueF) && (hueF <= 1));
return hueF;
}
static const auto ServerPartRegEx = QStringLiteral(
"(\\[[^][:blank:]]+\\]|[-[:alnum:].]+)" // Either IPv6 address or hostname/IPv4 address
"(?::(\\d{1,5}))?" // Optional port
);
QString Quotient::serverPart(const QString& mxId)
{
static QString re = "^[@!#$+].*?:(" // Localpart and colon
% ServerPartRegEx % ")$";
static QRegularExpression parser(
re,
QRegularExpression::UseUnicodePropertiesOption); // Because Asian digits
Q_ASSERT(parser.isValid());
return parser.match(mxId).captured(1);
}
// Tests for function_traits<>
using namespace Quotient;
int f_();
static_assert(std::is_same<fn_return_t<decltype(f_)>, int>::value,
"Test fn_return_t<>");
void f1_(int, QString);
static_assert(std::is_same<fn_arg_t<decltype(f1_), 1>, QString>::value,
"Test fn_arg_t<>");
struct Fo {
int operator()();
static constexpr auto l = [] { return 0.0f; };
};
static_assert(std::is_same<fn_return_t<Fo>, int>::value,
"Test return type of function object");
static_assert(std::is_same<fn_return_t<decltype(Fo::l)>, float>::value,
"Test return type of lambda");
struct Fo1 {
void operator()(int);
};
static_assert(std::is_same<fn_arg_t<Fo1>, int>(),
"Test fn_arg_t defaulting to first argument");
template <typename T>
static QString ft(T&&);
static_assert(std::is_same<fn_arg_t<decltype(ft<QString>)>, QString&&>(),
"Test function templates");
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