twittertimelinemodel.cpp Example File

  /****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the Qt Network Auth module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** "Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/

  #include "twittertimelinemodel.h"

  #include <QtGui>
  #include <QtCore>
  #include <QtWidgets>

  TwitterTimelineModel::TwitterTimelineModel(QObject *parent) : QAbstractTableModel(parent)
  {
      connect(&twitter, &Twitter::authenticated, this, &TwitterTimelineModel::authenticated);
      connect(&twitter, &Twitter::authenticated, this, &TwitterTimelineModel::updateTimeline);
  }

  int TwitterTimelineModel::rowCount(const QModelIndex &parent) const
  {
  #if defined(QT_DEBUG)
      Q_ASSERT(!parent.isValid());
  #else
      Q_UNUSED(parent)
  #endif
      return tweets.size();
  }

  QVariant TwitterTimelineModel::data(const QModelIndex &index, int role) const
  {
      if (role != Qt::DisplayRole)
          return QVariant();

      auto it = tweets.begin();
      std::advance(it, index.row());
      switch (index.column())
      {
      case 0:
          return QString::number(it->id);
      case 1:
          return it->createdAt.toString(Qt::SystemLocaleShortDate);
      case 2:
          return it->user;
      case 3:
          return it->text;
      }
      return QVariant();
  }

  int TwitterTimelineModel::columnCount(const QModelIndex &) const
  {
      return 4;
  }

  QVariant TwitterTimelineModel::headerData(int section, Qt::Orientation orientation, int role) const
  {
      if (role != Qt::DisplayRole)
          return QVariant();

      if (orientation == Qt::Horizontal) {
          switch (section) {
          case 0:
              return QStringLiteral("Id");
          case 1:
              return QStringLiteral("Created at");
          case 2:
              return QStringLiteral("User");
          case 3:
              return QStringLiteral("Text");
          }
      }
      return section;
  }

  void TwitterTimelineModel::authenticate(const QPair<QString, QString> &clientCredentials)
  {
      twitter.setClientCredentials(clientCredentials);
      twitter.grant();
  }

  QAbstractOAuth::Status TwitterTimelineModel::status() const
  {
      return twitter.status();
  }

  void TwitterTimelineModel::updateTimeline()
  {
      if (twitter.status() != Twitter::Status::Granted)
          QMessageBox::warning(nullptr, qApp->applicationName(), "Not authenticated");

      QUrl url("https://api.twitter.com/1.1/statuses/home_timeline.json");
      QUrlQuery query;
      if (tweets.size()) {
          // Tweets are time-ordered, newest first.  Pass the most recent
          // ID we have to request everything more recent than it:
          query.addQueryItem("since_id", QString::number(tweets.first().id));
          // From https://dev.twitter.com/rest/reference/get/search/tweets:
          // Returns results with an ID greater than (that is, more recent than)
          // the specified ID. There are limits to the number of Tweets which can
          // be accessed through the API. If the limit of Tweets has occurred
          // since the since_id, the since_id will be forced to the oldest ID
          // available.
      }
      url.setQuery(query);
      QNetworkReply *reply = twitter.get(url);
      connect(reply, &QNetworkReply::finished, this, &TwitterTimelineModel::parseJson);
  }

  void TwitterTimelineModel::parseJson()
  {
      QJsonParseError parseError;
      auto reply = qobject_cast<QNetworkReply*>(sender());
      Q_ASSERT(reply);
      const auto data = reply->readAll();
      const auto document = QJsonDocument::fromJson(data, &parseError);
      if (parseError.error) {
          qCritical() << "TwitterTimelineModel::parseJson. Error at:" << parseError.offset
                      << parseError.errorString();
          return;
      } else if (document.isObject()) {
          // Error received :(
          const auto object = document.object();
          const auto errorArray = object.value("errors").toArray();
          Q_ASSERT_X(errorArray.size(), "parse", data);
          QStringList errors;
          for (const auto error : errorArray) {
              Q_ASSERT(error.isObject());
              Q_ASSERT(error.toObject().contains("message"));
              errors.append(error.toObject().value("message").toString());
          }
          QMessageBox::warning(nullptr, qApp->applicationName(), errors.join("<br />"));
          return;
      }

      Q_ASSERT_X(document.isArray(), "parse", data);
      const auto array = document.array();
      if (array.size()) {
          beginInsertRows(QModelIndex(), 0, array.size() - 1);
          auto before = tweets.begin();
          for (const auto &value : array) {
              Q_ASSERT(value.isObject());
              const auto object = value.toObject();
              const auto createdAt = QDateTime::fromString(object.value("created_at").toString(),
                                                           "ddd MMM dd HH:mm:ss +0000 yyyy");
              before = tweets.insert(before, Tweet{
                                         object.value("id").toVariant().toULongLong(),
                                         createdAt,
                                         object.value("user").toObject().value("name").toString(),
                                         object.value("text").toString()
                                     });
              std::advance(before, 1);
          }
          endInsertRows();
      }
  }