Add adblocklist class

5 files changed, 152 insertions, 5 deletions

diff --git a/lib/urlfilter/formats/adblocklist.cpp b/lib/urlfilter/formats/adblocklist.cpp
new file mode 100644
index 0000000..772c252
--- /dev/null
+++ b/lib/urlfilter/formats/adblocklist.cpp
@@ -0,0 +1,95 @@
+#include "adblocklist.h"
+
+AdBlockList::AdBlockList()
+{
+}
+
+QString AdBlockList::metadata(const QString &key) const
+{
+    return m_metadata.value(key, QString());
+}
+
+FilterLeaf::Action AdBlockList::match(const QUrl &firstParty, const QUrl &requestUrl, QWebEngineUrlRequestInfo::ResourceType type) const
+{
+    const QString request = requestUrl.toString();
+
+    for(auto &filter : m_rules) {
+        if(filter.matcher->hasMatch(request))
+            return filter.action;
+    }
+    return FilterLeaf::NotMatched;
+}
+
+bool AdBlockList::parseLine(const QString &line)
+{
+    // remove whitespace from start/end of the line
+    QString parsedLine = line.trimmed();
+
+    // check if the line is empty
+    if(parsedLine.isEmpty())
+        return false;
+
+    // parse comment
+    if(parsedLine.startsWith(QLatin1Literal("!")))
+        return parseComment(parsedLine);
+
+    Filter filter;
+
+    // exception rules
+    if(parsedLine.startsWith(QLatin1Literal("@@"))) {
+        filter.action = FilterLeaf::Allow;
+        parsedLine.remove(0, 2);
+    }
+
+    // remove '*' at the beginning and the end
+    if(parsedLine.startsWith(QLatin1Literal("*")))
+        parsedLine = parsedLine.mid(1);
+    if(parsedLine.endsWith(QLatin1Literal("*")))
+        parsedLine.chop(1);
+
+    if(parsedLine.startsWith(QLatin1Literal("/")) && parsedLine.endsWith(QLatin1Literal("/"))) {
+        // regular expression rule
+        parsedLine = parsedLine.mid(1, parsedLine.length() - 2);
+        filter.matcher = new ContentsMatcher<QRegularExpression>(parsedLine, FilterLeaf::RegularExpressionMatch);
+
+    } else if(parsedLine.contains(QLatin1Literal("*"))) {
+        parsedLine = QRegularExpression::wildcardToRegularExpression(parsedLine);
+        filter.matcher = new ContentsMatcher<QRegularExpression>(parsedLine, FilterLeaf::RegularExpressionMatch);
+
+    } else if(parsedLine.startsWith(QLatin1Literal("||")) && parsedLine.endsWith(QLatin1Literal("^"))) {
+//        matchType = FilterLeaf::DomainMatch;
+        parsedLine = parsedLine.mid(2, parsedLine.length() - 3);
+        filter.matcher = new ContentsMatcher<QString>(parsedLine, FilterLeaf::DomainMatch);
+
+    } else if(parsedLine.startsWith(QLatin1Literal("|")) && parsedLine.endsWith(QLatin1Literal("|"))) {
+        // string equals rule
+        parsedLine = parsedLine.mid(1, parsedLine.length() - 2);
+        filter.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, FilterLeaf::StringEquals);
+
+    } else if(parsedLine.startsWith(QLatin1Literal("||"))) {
+        // string starts with rule
+        parsedLine = parsedLine.mid(2);
+        filter.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, FilterLeaf::StringStartsWith);
+
+    } else if(parsedLine.endsWith(QLatin1Literal("|"))) {
+        // string ends with rule
+        parsedLine.chop(1);
+        filter.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, FilterLeaf::StringEndsWith);
+
+    } else {
+        // generic contains rule
+        filter.matcher = new ContentsMatcher<QStringMatcher>(parsedLine, FilterLeaf::StringContains);
+    }
+
+
+    Q_CHECK_PTR(filter.matcher);
+    m_rules.emplace_back(std::move(filter));
+    return true;
+}
+
+bool AdBlockList::parseComment(const QString &commentLine)
+{
+    const QStringList comment = commentLine.mid(1).split(QLatin1Literal(": "));
+    m_metadata[comment.at(0).trimmed()] = comment.at(1).trimmed();
+    return true;
+}
diff --git a/lib/urlfilter/formats/adblocklist.h b/lib/urlfilter/formats/adblocklist.h
new file mode 100644
index 0000000..34a2120
--- /dev/null
+++ b/lib/urlfilter/formats/adblocklist.h
@@ -0,0 +1,32 @@
+#ifndef ADBLOCKLIST_H
+#define ADBLOCKLIST_H
+
+#include <QHash>
+#include "adblockrule.h"
+
+class AdBlockList
+{
+public:
+    AdBlockList();
+
+    QString metadata(const QString &key) const;
+    FilterLeaf::Action match(const QUrl &firstParty, const QUrl &requestUrl, QWebEngineUrlRequestInfo::ResourceType type = QWebEngineUrlRequestInfo::ResourceTypeUnknown) const;
+
+    bool parseLine(const QString &line);
+
+protected:
+    bool parseComment(const QString &commentLine);
+
+private:
+    struct Filter
+    {
+        FilterLeaf::Action action = FilterLeaf::Block;
+        Matcher *matcher;
+    };
+
+    QHash<QString, QString> m_metadata;
+    //QMap<QString, Filter> m_rules;
+    std::vector<Filter> m_rules;
+};
+
+#endif // ADBLOCKLIST_H
diff --git a/lib/urlfilter/formats/adblockrule.h b/lib/urlfilter/formats/adblockrule.h
index 3331cac..6be3cdf 100644
--- a/lib/urlfilter/formats/adblockrule.h
+++ b/lib/urlfilter/formats/adblockrule.h
@@ -14,24 +14,35 @@
 #include <QRegularExpression>
 #include <QStringMatcher>
 
+class Matcher
+{
+public:
+    virtual bool hasMatch(const QString &where) const = 0;
+};
+
 template <typename T>
-class ContentsMatcher
+class ContentsMatcher : public Matcher
 {
 public:
     ContentsMatcher(const QString &pattern, FilterLeaf::UrlMatchType matchType)
     {
         this->matchType = matchType;
         patternLength = pattern.length();
-        matcher.setPattern(pattern);
+
 
         if constexpr(std::is_same_v<T, QRegularExpression>) {
             matcher.setPatternOptions(matcher.patternOptions() | QRegularExpression::CaseInsensitiveOption);
+            matcher.setPattern(pattern);
         } else if constexpr(std::is_same_v<T, QStringMatcher>) {
             matcher.setCaseSensitivity(Qt::CaseInsensitive);
+            matcher.setPattern(pattern);
+        } else if constexpr(std::is_same_v<T, QString>) {
+            matcher = QUrl::fromUserInput(pattern).host();
+//            qDebug("matcher: %s", qUtf8Printable(matcher));
         }
     }
 
-    bool hasMatch(const QString &where) const
+    bool hasMatch(const QString &where) const override
     {
         if constexpr(std::is_same_v<T, QStringMatcher>) {
             switch (matchType) {
@@ -58,6 +69,13 @@ public:
             if(matchType != FilterLeaf::RegularExpressionMatch)
                 qWarning("ContentsMatcher is a regular expression, but not doing a regular expression match!");
             return matcher.match(where).hasMatch();
+        } else if constexpr(std::is_same_v<T, QString>) {
+            // TODO: fix
+            if(matchType == FilterLeaf::DomainMatch) {
+//                qDebug("matching %s", qUtf8Printable(QUrl(where).host()));
+                return QUrl(where).host().endsWith(matcher);
+            } else
+                return matcher == where;
         } else {
             qWarning("Matcher has no backend, returning false");
             return false;
@@ -65,7 +83,7 @@ public:
     }
 
 private:
-                int patternLength;
+    int patternLength;
     T matcher;
     FilterLeaf::UrlMatchType matchType;
 };
diff --git a/lib/urlfilter/formats/adblockrule_parse.cpp b/lib/urlfilter/formats/adblockrule_parse.cpp
index 927a6a3..c01ddfd 100644
--- a/lib/urlfilter/formats/adblockrule_parse.cpp
+++ b/lib/urlfilter/formats/adblockrule_parse.cpp
@@ -15,6 +15,7 @@
 // QString::mid(pos, len) const - Returns a string starting at the specified position index.
 // QString::chop(len) - Removes n characters from the end of the string.
 // QString::remove(pos, len) - Removes n characters from the string, starting at the given position index.
+// QString::trimmed() const - Remove whitespace from start and end
 
 AdBlockRule *parseRule_adblock(const QString &filter)
 {
diff --git a/lib/urlfilter/meson.build b/lib/urlfilter/meson.build
index 5d0a970..1f4f47c 100644
--- a/lib/urlfilter/meson.build
+++ b/lib/urlfilter/meson.build
@@ -8,7 +8,8 @@ urlfilter_moc = qt5.preprocess(
 urlfilter_lib = static_library('urlfilter',
     ['filtertree.cpp', 'filterleaf.cpp', urlfilter_moc,
     'domain.cpp', 'domain.h',
-    'formats/adblockrule.cpp', 'formats/adblockrule_parse.cpp', 'formats/hostlistrule.cpp', ],
+    'formats/adblockrule.cpp', 'formats/adblockrule_parse.cpp', 'formats/hostlistrule.cpp', 
+    'formats/adblocklist.cpp'],
     dependencies: dep_qt5
 )