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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://neueland.iserlohn-fortress.net/gitea/aqua/smolbote
*
* SPDX-License-Identifier: GPL-3.0
*/
#include "adblocklist.h"
#include "parser.h"
#include <QIODevice>
#include <QTextStream>
#include <QDebug>
AdBlockList::AdBlockList(QIODevice *device)
{
Q_ASSERT(device->isOpen());
QTextStream list(device);
while (!list.atEnd()) {
parseLine(list.readLine());
}
qDebug() << m_metadata;
}
AdBlockList::~AdBlockList()
{
for(Rule &r : rules) {
delete r.matcher;
}
}
QString AdBlockList::metadata(const QString& key) const
{
return m_metadata.value(key);
}
int AdBlockList::ruleCount() const
{
return rules.size();
}
std::pair<UrlFilter::MatchResult, QString> AdBlockList::match(const QUrl& firstParty, const QUrl& requestUrl, QWebEngineUrlRequestInfo::ResourceType type) const
{
const QString domain = firstParty.host();
const QString request = requestUrl.toString();
for(const Rule &r : rules) {
// if there are options specified, but not the one we need
if(!r.options.isEmpty() && !r.options.contains(type))
continue;
if(r.disabledOn.contains(domain))
continue;
if(!r.enabledOn.isEmpty() && !r.enabledOn.contains(domain))
continue;
if(r.matcher->hasMatch(request))
return std::make_pair(r.action, QString());
}
return std::make_pair(UrlFilter::NotMatched, QString());
}
void AdBlockList::parseLine(const QString& line)
{
QString parsedLine = line.trimmed();
if(parsedLine.isEmpty())
return;
if(parsedLine.startsWith(QLatin1String("!"))) {
const auto comment = parseComment(parsedLine);
if(comment) {
const auto key = comment.value().first;
if(keys.contains(key))
m_metadata[key] = comment.value().second;
}
return;
}
// css rule -> filterleaves cannot do element blocking
if(parsedLine.contains(QLatin1String("##")) || parsedLine.contains(QLatin1String("#@#"))) {
qDebug("TODO: %s", qUtf8Printable(parsedLine));
return;
}
Rule r;
r.action = UrlFilter::Block;
// exception rules
if(parsedLine.startsWith(QLatin1String("@@"))) {
r.action = UrlFilter::Allow;
parsedLine.remove(0, 2);
}
bool matchCase = false;
// parse options
{
const int sepPos = parsedLine.indexOf(QLatin1String("$"));
if(sepPos != -1) {
const auto options = parsedLine.mid(sepPos + 1).split(QLatin1String(","));
parsedLine = parsedLine.mid(0, sepPos);
for(const QString &option : options) {
if(option.startsWith(QLatin1String("domain"))) {
const auto domainList = option.mid(7).split(QLatin1String("|"));
for(const QString &domain : domainList) {
if(domain.startsWith(QLatin1String("~"))) {
r.disabledOn.append(domain.mid(1));
} else {
r.enabledOn.append(domain);
}
}
} else if(option.endsWith(QLatin1String("match-case"))) {
matchCase = !option.startsWith(QLatin1String("~"));
} else {
const auto pair = parseResourceOption(option);
if(pair)
r.options.insert(pair.value().first, pair.value().second);
}
}
}
}
if(parsedLine.startsWith(QLatin1String("/")) && parsedLine.endsWith(QLatin1String("/"))) {
// regular expression rule
parsedLine = parsedLine.mid(1, parsedLine.length() - 2);
r.matcher = new ContentsMatcher<QRegularExpression>(parsedLine, UrlFilter::RegularExpressionMatch);
} else if(parsedLine.startsWith(QLatin1String("||")) && parsedLine.endsWith(QLatin1String("^"))) {
parsedLine = parsedLine.mid(2, parsedLine.length() - 3);
r.matcher = new ContentsMatcher<QString>(parsedLine, UrlFilter::DomainMatch);
} else if(parsedLine.startsWith(QLatin1String("|")) && parsedLine.endsWith(QLatin1String("|"))) {
// string equals rule
parsedLine = parsedLine.mid(1, parsedLine.length() - 2);
r.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, UrlFilter::StringEquals);
} else if(parsedLine.startsWith(QLatin1String("||"))) {
// string starts with rule
parsedLine = parsedLine.mid(2);
r.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, UrlFilter::StringStartsWith);
} else if(parsedLine.endsWith(QLatin1String("|"))) {
// string ends with rule
parsedLine.chop(1);
r.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, UrlFilter::StringEndsWith);
} else {
// generic contains rule
// remove beginning and ending wildcards
if(parsedLine.startsWith(QLatin1String("*")))
parsedLine = parsedLine.mid(1);
if(parsedLine.endsWith(QLatin1String("*")))
parsedLine.chop(1);
if(parsedLine.contains(QLatin1String("*")) || parsedLine.contains(QLatin1String("^"))) {
// check for wildcards and translate to regexp
// wildcard "*" - any number of characters
// separator "^" - end, ? or /
parsedLine.replace(QLatin1String("||"), QLatin1String("^\\w+://"));
parsedLine.replace(QLatin1String("|"), QLatin1String("\\|"));
parsedLine.replace(QLatin1String("*"), QLatin1String(".*"));
parsedLine.replace(QLatin1String("^"), QLatin1String("($|\\?|\\/)"));
r.matcher = new ContentsMatcher<QRegularExpression>(parsedLine, UrlFilter::RegularExpressionMatch);
} else {
r.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, UrlFilter::StringContains);
}
}
r.matcher->setCaseSensitive(matchCase);
Q_CHECK_PTR(r.matcher);
rules.emplace_back(std::move(r));
}
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