1 files changed, 116 insertions, 0 deletions
diff --git a/src/webengine/filter.cpp b/src/webengine/filter.cpp
new file mode 100644
index 0000000..b250843
--- /dev/null
+++ b/src/webengine/filter.cpp
@@ -0,0 +1,116 @@
+/*
+ * 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 "filter.h"
+#include "urlinterceptor.h"
+#include <QDir>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QTextStream>
+#include <configuration/configuration.h>
+#include "util.h"
+
+
+QHash<QString, Filter::HostRule> parseHostlist(const QString &filename)
+{
+    QHash<QString, Filter::HostRule> rules;
+
+    if(QFile hostfile(filename); hostfile.open(QIODevice::ReadOnly | QIODevice::Text)) {
+
+        // with a QTextStream we can read lines without getting linebreaks at the end
+        QTextStream hostfile_stream(&hostfile);
+
+        while(!hostfile_stream.atEnd()) {
+
+            // read line and remove any whitespace at the end
+            const QString &line = hostfile_stream.readLine().trimmed();
+
+            // skip comments and empty lines
+            if(line.isEmpty() || line.startsWith('#'))
+                continue;
+
+            // everything else should be a rule
+            // format is <redirect> <host>
+            // 0.0.0.0 hostname
+            const QStringList &parts = line.split(' ');
+            const QString &redirect = parts.at(0);
+
+            for(auto i = parts.constBegin() + 1; i != parts.constEnd(); ++i) {
+                if(!rules.contains(*i)) {
+                    Filter::HostRule rule{};
+                    rule.isBlocking = (redirect == "0.0.0.0");
+                    rules.insert(*i, rule);
+                }
+            }
+
+            //            for(const QString &host : parts.mid(1)) {
+            //                if(!rules.contains(host)) {
+            //                    UrlRequestInterceptor::HostRule rule{};
+            //                    rule.isBlocking = redirect == "0.0.0.0";
+            //                    rules.insert(host, rule);
+            //                }
+            //            }
+        }
+
+        hostfile.close();
+    }
+
+    return rules;
+}
+/*
+inline std::vector<FilterRule> parseAdBlockList(const QString &filename)
+{
+    std::vector<FilterRule> rules;
+    QFile list(filename);
+
+    if(list.open(QIODevice::ReadOnly | QIODevice::Text), true) {
+        QTextStream l(&list);
+        QString line;
+        while(l.readLineInto(&line)) {
+            AdBlockRule rule(line);
+            if(rule.isEnabled()) {
+                rules.emplace_back(std::move(rule));
+            }
+        }
+        list.close();
+    }
+
+    return rules;
+}*/
+
+Filter::Filter::Filter(const std::unique_ptr<Configuration> &config, QObject* parent)
+    : QObject(parent)
+{
+    // parse headers
+    if(const auto headers = config->value<QStringList>("filter.header"); headers) {
+        for(const QString &header : headers.value()) {
+            const auto list = header.split(QLatin1Literal(":"));
+            if(list.length() == 2)
+                m_headers.insert(list.at(0).toLatin1(), list.at(1).toLatin1());
+        }
+    }
+
+    const QStringList hostfiles = Util::files(config->value<QString>("filter.path").value());
+    for(const QString &hostfile : hostfiles) {
+        m_hostlist.unite(parseHostlist(hostfile));
+    }
+
+    /*
+    auto filtersPath = config->value<QString>("filter.adblock");
+    if(filtersPath)
+        filters = parseAdBlockList(filtersPath.value());
+    */
+}
+
+std::optional<Filter::HostRule> Filter::hostlistRule(const QString& url) const
+{
+    if(!m_hostlist.contains(url))
+        return std::nullopt;
+
+    return std::optional<Filter::HostRule>(m_hostlist.value(url));
+}