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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
*/
#include "filterlist.h"
#include <QByteArray>
#include <QIODevice>
/**
* Documentation:
*
* https://adblockplus.org/filter-cheatsheet
* https://help.eyeo.com/adblockplus/how-to-write-filters
*
* https://github.com/gorhill/uBlock/wiki/Introduction-to-basic-filtering-syntax
* https://github.com/gorhill/uBlock/wiki/Static-filter-syntax
*
*/
const QLatin1String comment_lastModified("! Last modified: ");
const QLatin1String comment_expires("! Expires: ");
using namespace AdblockPlus;
Filterlist::Filterlist(QIODevice &from)
{
if(from.isReadable() && from.isTextModeEnabled()) {
while(from.bytesAvailable() > 0) {
const auto line = from.readLine(512);
if(line[0] == '!') {
parseComment(line);
} else if(line.contains("##") || line.contains("#@#")) {
// ## is element hiding rule
// #@# is element hiding exception rule
} else {
parseRule(line);
}
}
}
}
void Filterlist::parseComment(const QString &line)
{
if(line.startsWith(comment_lastModified)) {
lastModified = QDateTime::fromString(line.mid(comment_lastModified.size()), "dd MMM yyyy HH:mm 'UTC'");
expires = lastModified;
} else if(line.startsWith(comment_expires)) {
const QRegularExpression time_re("(?:(\\d+) days)|(?:(\\d+) hours)");
const auto match = time_re.match(line);
if(match.hasMatch()) {
expires = expires.addDays(match.captured(1).toInt());
expires = expires.addSecs(match.captured(2).toInt() * 60 * 60);
}
}
}
Rule *Filterlist::parseRule(const QByteArray &line)
{
QString pattern = line;
Options opt;
if(pattern.startsWith(QLatin1String("@@"))) {
pattern.remove(0, 2);
opt.exception = true;
}
// parse options
if(pattern.contains('$')) {
const auto list = pattern.split('$');
pattern = list.at(0);
const auto options = list.at(1);
if(!opt.parseAbp(&options)) {
return nullptr;
}
}
if(pattern.startsWith("||") && pattern.endsWith("^")) {
// domain match
pattern = pattern.mid(2, pattern.length() - 3);
return new MatcherRule(pattern, opt, MatcherRule::DomainMatch);
} else if(pattern.startsWith("|") && pattern.endsWith("|")) {
// string equals
pattern = pattern.mid(1, pattern.length() - 2);
return new MatcherRule(pattern, opt, MatcherRule::UrlEquals);
} else if(pattern.startsWith("|")) {
// string starts with
pattern = pattern.mid(1, pattern.length() - 1);
return new MatcherRule(pattern, opt, MatcherRule::UrlStartsWith);
} else if(pattern.endsWith("|")) {
// string ends with
pattern = pattern.mid(0, pattern.length() - 1);
return new MatcherRule(pattern, opt, MatcherRule::UrlEndsWith);
} else if(pattern.startsWith("/") && pattern.endsWith("/")) {
// regular expression
pattern = pattern.mid(1, pattern.length() - 2);
return new RegexRule(pattern, opt);
} else if(!pattern.isEmpty()) {
if(pattern.contains('*')) {
// wildcard pattern
pattern = QRegularExpression::wildcardToRegularExpression(pattern);
return new RegexRule(pattern, opt);
} else {
// contains pattern
return new MatcherRule(pattern, opt);
}
}
return nullptr;
}
bool Filterlist::filter(QWebEngineUrlRequestInfo &info) const
{
return false;
}
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