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/*******************************************************************************
**
** smolbote: yet another qute browser
** Copyright (C) 2017 Xian Nox
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
**
******************************************************************************/
#include "blockerrule.h"
/* AdBlock filter reference
* https://adblockplus.org/en/filters
* https://adblockplus.org/en/filter-cheatsheet
*/
BlockerRule::BlockerRule(QString rule, QObject *parent) :
QObject(parent)
{
m_filter = rule;
QString pattern = rule;
// Empty rule or comment
if(pattern.trimmed().isEmpty() || pattern.startsWith("!")) {
m_valid = false;
return;
}
// Exception
if(pattern.startsWith("@@")) {
m_exception = true;
pattern.remove(0, 2);
}
// Ignore element hiding rules for now
if(pattern.contains("##") || pattern.contains("#@#")) {
m_valid = false;
return;
}
// Options
if(pattern.contains("$")) {
QString opts = pattern.mid(pattern.indexOf("$")+1);
pattern.remove(pattern.indexOf("$"), pattern.length());
for(QString opt : opts.split(',')) {
parseOption(opt);
}
}
// Regular expression
if(rule.startsWith("/") && rule.endsWith("/")) {
m_valid = true;
ruleExpression.setPattern(pattern);
return;
}
// Domain rules
if(pattern.startsWith("||")) {
pattern.remove(0, 2);
// find the end point for the domain
int end = pattern.indexOf(QRegularExpression("(?:[^\\w\\d\\_\\-\\.\\%]|$)"), 0);
domainExpression.setPattern(pattern.mid(0, end));
pattern.remove(0, end+1);
} else if(pattern.startsWith("|") && pattern.endsWith("|")) {
pattern.remove(0, 1);
pattern.chop(1);
domainExpression.setPattern(pattern);
} else {
domainExpression.setPattern(".*");
}
// Regular rule
ruleExpression.setWildcardPattern(pattern);
m_valid = true;
}
bool BlockerRule::match(const QWebEngineUrlRequestInfo &info)
{
if(!m_valid) {
return false;
}
// if both domain and rule match
if(domainExpression.match(info.requestUrl().host()) && ruleExpression.match(info.requestUrl().toString())) {
// option explicitly allows
if(matchOptions(info, m_whitelistOptions)) {
return false;
}
// option explicitly bans
if(matchOptions(info, m_blacklistOptions)) {
return true;
}
// no options, but both domain and rule match --> rule matches
return true;
}
// domain and/or rule do not match
return false;
}
bool BlockerRule::isValid()
{
return m_valid;
}
bool BlockerRule::isException()
{
return m_exception;
}
QString BlockerRule::filter() const
{
return m_filter;
}
void BlockerRule::parseOption(const QString &opt)
{
if(opt.startsWith("script")) {
m_blacklistOptions.setFlag(RuleOption::script, true);
} else if(opt.startsWith("~script")) {
m_whitelistOptions.setFlag(RuleOption::script, true);
} else if(opt.startsWith("image")) {
m_blacklistOptions.setFlag(RuleOption::image, true);
} else if(opt.startsWith("~image")) {
m_whitelistOptions.setFlag(RuleOption::image, true);
} else if(opt.startsWith("stylesheet")) {
m_blacklistOptions.setFlag(RuleOption::stylesheet, true);
} else if(opt.startsWith("~stylesheet")) {
m_whitelistOptions.setFlag(RuleOption::stylesheet, true);
} else if(opt.startsWith("object")) {
m_blacklistOptions.setFlag(RuleOption::object, true);
} else if(opt.startsWith("~object")) {
m_whitelistOptions.setFlag(RuleOption::object, true);
} else if(opt.startsWith("object-subrequest")) {
m_blacklistOptions.setFlag(RuleOption::objectsubrequest, true);
} else if(opt.startsWith("~object-subrequest")) {
m_whitelistOptions.setFlag(RuleOption::objectsubrequest, true);
} else if(opt.startsWith("subdocument")) {
m_blacklistOptions.setFlag(RuleOption::subdocument, true);
} else if(opt.startsWith("~subdocument")) {
m_whitelistOptions.setFlag(RuleOption::subdocument, true);
}
}
bool BlockerRule::matchOptions(const QWebEngineUrlRequestInfo &info, const RuleOptions &options)
{
// no options are defined
if(options == 0) {
return false;
}
bool hasOption = false;
switch (info.resourceType()) {
case QWebEngineUrlRequestInfo::ResourceTypeScript:
if(options.testFlag(RuleOption::script)) {
hasOption = true;
}
break;
case QWebEngineUrlRequestInfo::ResourceTypeImage:
if(options.testFlag(RuleOption::image)) {
hasOption = true;
}
break;
case QWebEngineUrlRequestInfo::ResourceTypeStylesheet:
if(options.testFlag(RuleOption::stylesheet)) {
hasOption = true;
}
break;
case QWebEngineUrlRequestInfo::ResourceTypeObject:
if(options.testFlag(RuleOption::object)) {
hasOption = true;
}
break;
case QWebEngineUrlRequestInfo::ResourceTypePluginResource:
if(options.testFlag(RuleOption::objectsubrequest)) {
hasOption = true;
}
break;
case QWebEngineUrlRequestInfo::ResourceTypeSubFrame:
if(options.testFlag(RuleOption::subdocument)) {
hasOption = true;
}
break;
default:
break;
}
return hasOption;
}
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