Qt Documentation (Technology Preview) | Qt Network Authorization | Reddit Example | redditwrapper.cpp Example File

Qt 5.9.3 Reference Documentation

# redditwrapper.cpp Example File

redditclient/redditwrapper.cpp

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      #include "redditwrapper.h"

      #include <QtGui>
      #include <QtCore>
      #include <QtNetworkAuth>

      const QUrl newUrl("https://oauth.reddit.com/new");
      const QUrl hotUrl("https://oauth.reddit.com/hot");
      const QUrl liveThreadsUrl("https://oauth.reddit.com/live/XXXX/about.json");

      RedditWrapper::RedditWrapper(QObject *parent) : QObject(parent)
      {
          auto replyHandler = new QOAuthHttpServerReplyHandler(1337, this);
          oauth2.setReplyHandler(replyHandler);
          oauth2.setAuthorizationUrl(QUrl("https://www.reddit.com/api/v1/authorize"));
          oauth2.setAccessTokenUrl(QUrl("https://www.reddit.com/api/v1/access_token"));
          oauth2.setScope("identity read");

          connect(&oauth2, &QOAuth2AuthorizationCodeFlow::statusChanged, [=](
                  QAbstractOAuth::Status status) {
              if (status == QAbstractOAuth::Status::Granted)
                  emit authenticated();
          });
          oauth2.setModifyParametersFunction([&](QAbstractOAuth::Stage stage, QVariantMap *parameters) {
              if (stage == QAbstractOAuth::Stage::RequestingAuthorization && isPermanent())
                  parameters->insert("duration", "permanent");
          });
          connect(&oauth2, &QOAuth2AuthorizationCodeFlow::authorizeWithBrowser,
                  &QDesktopServices::openUrl);
      }

      RedditWrapper::RedditWrapper(const QString &clientIdentifier, QObject *parent) :
          RedditWrapper(parent)
      {
          oauth2.setClientIdentifier(clientIdentifier);
      }

      QNetworkReply *RedditWrapper::requestHotThreads()
      {
          qDebug() << "Getting hot threads...";
          return oauth2.get(hotUrl);
      }

      bool RedditWrapper::isPermanent() const
      {
          return permanent;
      }

      void RedditWrapper::setPermanent(bool value)
      {
          permanent = value;
      }

      void RedditWrapper::grant()
      {
          oauth2.grant();
      }

      void RedditWrapper::subscribeToLiveUpdates()
      {
          qDebug() << "Susbscribing...";
          QNetworkReply *reply = oauth2.get(liveThreadsUrl);
          connect(reply, &QNetworkReply::finished, [=]() {
              if (reply->error() != QNetworkReply::NoError) {
                  qCritical() << "Reddit error:" << reply->errorString();
                  return;
              }

              const auto json = reply->readAll();

              const auto document = QJsonDocument::fromJson(json);
              Q_ASSERT(document.isObject());
              const auto rootObject = document.object();
              const auto dataValue = rootObject.value("data");
              Q_ASSERT(dataValue.isObject());
              const auto dataObject = dataValue.toObject();
              const auto websocketUrlValue = dataObject.value("websocket_url");
              Q_ASSERT(websocketUrlValue.isString() && websocketUrlValue.toString().size());
              const QUrl websocketUrl(websocketUrlValue.toString());
              emit subscribed(websocketUrl);
          });
      }