gcalendar.cpp

#include "gcalendar.h"

using namespace std;
QString client_id="_client_id_";
QString client_secret="_client_secret_";
QString device_code;
QString user_code;
QString grant_type = "http://oauth.net/grant_type/device/1.0";
QString access_token;

GCalendar::GCalendar()
{

}

QString GCalendar::gLogin()
{
    // Just to ignore the logged ssl warnings
    QLoggingCategory::setFilterRules("qt.network.ssl.w arning=false");

    // Create custom temporary event loop on stack
    QEventLoop eventLoop;

    // "quit()" the event-loop, when the network request "finished()"
    QNetworkAccessManager mgr;
    QObject::connect(&mgr, SIGNAL(finished(QNetworkReply*)), &eventLoop, SLOT(quit()));

    // The HTTP request
    QUrl device_url = QString("https://accounts.google.com/o/oauth2/device/code");
    //QUrl device_url = QUrl::fromPercentEncoding(":set -u https://accounts.google.com/o/oauth2/device/code content.headers.user_agent 'Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0'");
    QNetworkRequest networkRequest(device_url);
    networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");

    QString scope_url =  "https://www.googleapis.com/auth/calendar.readonly";
    QString content = QString("client_id=%1&scope=%2")
            .arg(client_id)
            .arg(scope_url);

    QNetworkReply *addr_reply = mgr.post(networkRequest, content.toUtf8());
    eventLoop.exec(); // blocks stack until "finished()" has been called

    if (addr_reply->error() == QNetworkReply::NoError) {

        QByteArray jsonData = addr_reply->readAll();

        QJsonDocument document = QJsonDocument::fromJson(jsonData);

        device_code = document.object().value("device_code").toString();
        user_code = document.object().value("user_code").toString();
    }
    else {
        //failure
        qDebug() << "Failure: " <<addr_reply->errorString();

        QByteArray jsonData = addr_reply->readAll();

        QJsonDocument document = QJsonDocument::fromJson(jsonData);
        qDebug() << "document: " << document;
    }
    eventLoop.quit();
    return user_code;
}

void GCalendar::getAccessToken()
{
    // Just to ignore the logged ssl warnings
    QLoggingCategory::setFilterRules("qt.network.ssl.w arning=false");

    // Create custom temporary event loop on stack
    QEventLoop eventLoop;

    // "quit()" the event-loop, when the network request "finished()"
    QNetworkAccessManager mgr;
    QObject::connect(&mgr, SIGNAL(finished(QNetworkReply*)), &eventLoop, SLOT(quit()));

    // The HTTP request
    QUrl token_url = QString("https://www.googleapis.com/oauth2/v4/token");
    QNetworkRequest networkRequest(token_url);
    networkRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");

    QString content = QString("client_id=%1&client_secret=%2&code=%3&grant_type=%4")
            .arg(client_id)
            .arg(client_secret)
            .arg(device_code)
            .arg(grant_type);

    QNetworkReply *addr_reply = mgr.post(networkRequest, content.toUtf8());
    // Blocks stack until "finished()" has been called
    eventLoop.exec();

    if (addr_reply->error() == QNetworkReply::NoError) {

        QByteArray jsonData = addr_reply->readAll();

        QJsonDocument document = QJsonDocument::fromJson(jsonData);

        access_token = document.object().value("access_token").toString();
    }
    else {
        //failure
        qDebug() << "Failure" <<addr_reply->errorString();
    }
    eventLoop.quit();
}

QString GCalendar::getEvent(QString date)
{
    if(date == "N/A" || date.isEmpty())
    {
        return "N/A";
    }

    QString event_name;
    // Just to ignore the logged ssl warnings
    QLoggingCategory::setFilterRules("qt.network.ssl.w arning=false");

    // Create custom temporary event loop on stack
    QEventLoop eventLoop;

    // "quit()" the event-loop, when the network request "finished()"
    QNetworkAccessManager mgr;
    QObject::connect(&mgr, SIGNAL(finished(QNetworkReply*)), &eventLoop, SLOT(quit()));

    // The HTTP request
    QUrl api_endpoint = QString("https://www.googleapis.com/calendar/v3/calendars/primary/events?"
                                    "timeMax=" + date + "T23%3A59%3A59%2B06%3A00&timeMin=" + date + "T00%3A00%3A00%2B06%3A00&fields=items%2Fsummary");
    QNetworkRequest networkRequest(api_endpoint);

    QString prepared_access_token = "Bearer " + access_token;
    networkRequest.setRawHeader("Authorization", prepared_access_token.toUtf8());

    QNetworkReply *addr_reply = mgr.get(networkRequest);
    eventLoop.exec(); // blocks stack until "finished()" has been called

    if (addr_reply->error() == QNetworkReply::NoError) {
        QByteArray jsonData = addr_reply->readAll();

        QJsonDocument document = QJsonDocument::fromJson(jsonData);
        QJsonObject items_object = document.object();
        QJsonValue items_value = items_object.value("items");
        QJsonArray items_array = items_value.toArray();

        if(!items_array.isEmpty()){
            event_name = items_array[0].toObject().value("summary").toString();
        }
        else {
            event_name = "N/A";
        }
    }
    else {
        //failure
        qDebug() << "getEvent Failure = " <<addr_reply->errorString();

        event_name = "N/A";
    }
    eventLoop.quit();
    return event_name;
}