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/*
* This file is part of smolbote. It's copyrighted by the contributors recorded
* in the version control history of the file, available from its original
* location: https://library.iserlohn-fortress.net/aqua/smolbote.git
*
* SPDX-License-Identifier: GPL-3.0
*/
#ifndef SMOLBOTE_ADBLOCK_RULE_H
#define SMOLBOTE_ADBLOCK_RULE_H
#include "options.h"
#include <QObject>
#include <QRegularExpression>
#include <QString>
#include <QStringMatcher>
namespace AdblockPlus
{
class Rule
{
public:
virtual ~Rule() = default;
/**
* requestUrl: requested URL
* initiatorUrl: URL of document that initiated navigation
* firstPartyUrl: URL of the page that issued the request
*/
virtual bool hasMatch(const QStringRef &requestUrl,
const QStringRef &initiatorUrl,
const QStringRef &firstPartyUrl,
QWebEngineUrlRequestInfo::ResourceType resourceType = QWebEngineUrlRequestInfo::ResourceTypeMainFrame) const = 0;
bool shouldRedirect() const
{
return options.redirect;
}
bool shouldBlock() const
{
return !options.exception;
}
protected:
Rule(const Options &opt)
: options(opt)
{
}
const Options options;
};
// The separator character can be anything but
// a letter, a digit, or one of the following: _, -, ., %.
// The end of the address is also accepted as a separator.
inline bool isSeparator(const QChar &c)
{
return !c.isLetter() && !c.isDigit() && c != '_' && c != '-' && c != '.' && c != '%';
}
class MatcherRule : public Rule
{
public:
enum MatchPosition {
DomainMatch,
UrlStartsWith,
UrlEndsWith,
UrlContains,
UrlEquals
};
MatcherRule(const QString &pattern, const Options &opt, const MatchPosition pos = UrlContains)
: Rule(opt)
, position(pos)
, matcher(pattern, opt.matchcase ? Qt::CaseSensitive : Qt::CaseInsensitive)
, patternLength(pattern.length())
{
}
explicit MatcherRule(const MatcherRule &) = delete;
MatcherRule &operator=(const MatcherRule &) = delete;
explicit MatcherRule(MatcherRule &&) = delete;
MatcherRule &operator=(MatcherRule &&) = delete;
~MatcherRule() = default;
bool hasMatch(const QStringRef &url,
const QStringRef &initiatorUrl,
const QStringRef &firstPartyUrl,
QWebEngineUrlRequestInfo::ResourceType resourceType = QWebEngineUrlRequestInfo::ResourceTypeMainFrame) const override
{
const auto index = matcher.indexIn(url);
if(index == -1) {
return false;
}
switch(position) {
case DomainMatch:
// match if
// there is only one : left of the index
// and
// character after pattern is separator or end of string
return (url.left(index).count(':') <= 1 && (index + patternLength == url.length() || isSeparator(url[index + patternLength])));
case UrlStartsWith:
return (index == 0);
case UrlEndsWith:
return (index == url.length() - patternLength);
case UrlContains:
return (index != -1);
case UrlEquals:
return (index == 0 && patternLength == url.length());
}
return false;
}
private:
const MatchPosition position;
const QStringMatcher matcher;
const int patternLength;
};
class RegexRule : public Rule
{
public:
RegexRule(const QString &rule, const Options &opt)
: Rule(opt)
, regex(rule)
{
if(!opt.matchcase) {
regex.setPatternOptions(QRegularExpression::CaseInsensitiveOption);
}
}
explicit RegexRule(const RegexRule &) = delete;
RegexRule &operator=(const RegexRule &) = delete;
explicit RegexRule(RegexRule &&) = delete;
RegexRule &operator=(RegexRule &&) = delete;
~RegexRule() = default;
bool hasMatch(const QStringRef &url,
const QStringRef &initiatorUrl,
const QStringRef &firstPartyUrl,
QWebEngineUrlRequestInfo::ResourceType resourceType = QWebEngineUrlRequestInfo::ResourceTypeMainFrame) const override
{
const auto match = regex.match(url);
return match.hasMatch();
}
private:
QRegularExpression regex;
};
} // namespace AdblockPlus
#endif // SMOLBOTE_ADBLOCK_RULE_H
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