display traffic volume since last visit

src/socketrunnable.cpp

@@ -26,6 +26,8 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 constexpr const int getValueBeforeSpaceLIMIT = 200;
 constexpr const int getValueBeforeBodyLIMIT = 1000;
 
+constexpr const char* lastTrafficVolumeCookie = "trafficvolume";
+
 SocketRunnable::SocketRunnable(qintptr socketDescriptor, QObject *parent) :
     SocketRunnableBase(socketDescriptor, parent)
 {
@@ -35,7 +37,17 @@ void SocketRunnable::get()
 {
     if (urlPath() == "/index.html")
     {
-        httpDocument().setBody(WebPage::document());
+        quint64 lastTrafficVolume = 0;
+        const QString cookieString = g::getValue(m_headers, "Cookie", g::GetValueType::HttpHeader);
+        if (not cookieString.isEmpty())
+        {
+            lastTrafficVolume = g::getValue(m_headers, lastTrafficVolumeCookie).toULongLong();
+        }
+
+        quint64 currentTrafficVolume = 0;
+        httpDocument().setBody( WebPage::document(lastTrafficVolume, &currentTrafficVolume) );
+        httpDocument().setHeader(HttpDocument::CommonHeader::SetCookie,
+                                 QString(lastTrafficVolumeCookie)+"="+QString::number(currentTrafficVolume)+"; max-age=31536000;");
         return;
     }
 
@@ -79,7 +91,7 @@ void SocketRunnable::reader()
     }
     else if (reqType != "HEAD")
     {
-        httpDocument().setCode(HttpDocument::Code::_400); // default code is 200
+        httpDocument().setCode(HttpDocument::Code::_400);
     }
 
     setDataToWrite(httpDocument().document());