Deserialized a list! Restructured project!

I finally got deserializing lists working. Exposing them to QML was not
a trivial task either. Note that I didn't do it the clean way. Nested
lists are not supported. But it works!

Because I got so frustarted at one point trying to implement things the
right way, I restructured the project to seperate the Sailfish code from
the Qt code and created a new, empty desktop project. The Qt code has
been transformed into a happy little library, to which the Sailfish OS
application links.

Note that QMake doesn't seem to strip the library for some reason.

core/src/credentialmanager.cpp

@@ -0,0 +1,85 @@
+/*
+Sailfin: a Jellyfin client written using Qt
+Copyright (C) 2020 Chris Josten
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "credentialmanager.h"
+
+CredentialsManager * CredentialsManager::newInstance(QObject *parent) {
+    return new FallbackCredentialsManager(parent);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FallbackCredentialsManager                                                                     //
+////////////////////////////////////////////////////////////////////////////////////////////////////
+FallbackCredentialsManager::FallbackCredentialsManager(QObject *parent)
+    : CredentialsManager (parent) {
+    m_settings.beginGroup("Credentials");
+}
+
+QString FallbackCredentialsManager::urlToGroupName(const QString &url) const {
+    // |'s are not allowed in URLS, but are in group names.
+    return QString::number(qHash(url), 16);
+}
+
+QString FallbackCredentialsManager::groupNameToUrl(const QString &group) const {
+    QString tmp = QString(group);
+    return tmp.replace('|', "/");
+}
+
+void FallbackCredentialsManager::store(const QString &server, const QString &user, const QString &token) {
+    m_settings.setValue(urlToGroupName(server) + "/users/" + user + "/accessToken", token);
+    m_settings.setValue(urlToGroupName(server) + "/address", server);
+}
+
+void FallbackCredentialsManager::get(const QString &server, const QString &user) const {
+    QString result = m_settings.value(urlToGroupName(server) + "/users/" + user + "/accessToken").toString();
+    emit CredentialsManager::tokenRetrieved(server, user, result);
+}
+
+void FallbackCredentialsManager::remove(const QString &server, const QString &user) {
+    m_settings.remove(urlToGroupName(server) + "/users/" + user);
+
+    // Check if only the /address key is left. In this case, the server section should be removed.
+    m_settings.beginGroup(urlToGroupName(server));
+    int childGroupsCount = m_settings.childGroups().count();
+    m_settings.endGroup();
+    if (childGroupsCount == 0) {
+        m_settings.remove(urlToGroupName(server));
+    }
+}
+
+void FallbackCredentialsManager::listServers() const {
+    QList<QString> keys = m_settings.childGroups();
+    qDebug() << "Servers: " << keys;
+    for (int i = 0; i < keys.size(); i++) {
+        keys[i] = m_settings.value(keys[i] + "/address").toString();
+    }
+    qDebug() << "Servers: " << keys;
+
+    emit CredentialsManager::serversListed(keys);
+}
+
+void FallbackCredentialsManager::listUsers(const QString &server) {
+    m_settings.beginGroup(urlToGroupName(server));
+    m_settings.beginGroup("users");
+    QStringList users = m_settings.childGroups();
+    qDebug() << "Users: " << users;
+    m_settings.endGroup();
+    m_settings.endGroup();
+    emit CredentialsManager::usersListed(users);
+}

core/src/jellyfin.cpp

@@ -0,0 +1,19 @@
+#include "jellyfin.h"
+namespace Jellyfin {
+
+void registerTypes() {
+    const char* QML_NAMESPACE = "nl.netsoj.chris.Jellyfin";
+    // Singletons are perhaps bad, but they are convenient :)
+    qmlRegisterSingletonType<Jellyfin::ApiClient>(QML_NAMESPACE, 1, 0, "ApiClient", [](QQmlEngine *eng, QJSEngine *js) {
+        Q_UNUSED(eng)
+        Q_UNUSED(js)
+        return dynamic_cast<QObject*>(new Jellyfin::ApiClient());
+    });
+    qmlRegisterType<Jellyfin::ServerDiscoveryModel>(QML_NAMESPACE, 1, 0, "ServerDiscoveryModel");
+    qmlRegisterType<Jellyfin::PlaybackManager>(QML_NAMESPACE, 1, 0, "PlaybackManager");
+
+    // API models
+    Jellyfin::registerModels(QML_NAMESPACE);
+    Jellyfin::registerSerializableJsonTypes(QML_NAMESPACE);
+}
+}

core/src/jellyfinapiclient.cpp

@@ -0,0 +1,283 @@
+/*
+Sailfin: a Jellyfin client written using Qt
+Copyright (C) 2020 Chris Josten
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "jellyfinapiclient.h"
+
+namespace Jellyfin {
+
+ApiClient::ApiClient(QObject *parent)
+    : QObject(parent),
+      m_webSocket(new WebSocket(this)) {
+    m_deviceName = QHostInfo::localHostName();
+    m_deviceId = QUuid::createUuid().toString(); // TODO: make this not random?
+    m_credManager = CredentialsManager::newInstance(this);
+
+    generateDeviceProfile();
+}
+
+QString ApiClient::version() const {
+    return QString(SAILFIN_VERSION);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// BASE HTTP METHODS                                                                              //
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+
+void ApiClient::addBaseRequestHeaders(QNetworkRequest &request, const QString &path, const QUrlQuery &params) {
+    addTokenHeader(request);
+    request.setRawHeader("Accept", "application/json;"); // profile=\"CamelCase\"");
+    request.setHeader(QNetworkRequest::UserAgentHeader, QString("Sailfin/%1").arg(version()));
+    QString url = this->m_baseUrl + path;
+    if (!params.isEmpty()) url += "?" + params.toString();
+    request.setUrl(url);
+}
+
+void ApiClient::addTokenHeader(QNetworkRequest &request) {
+    QString authentication =   "MediaBrowser ";
+    authentication        +=   "Client=\"Sailfin\"";
+    authentication        += ", Device=\"" + m_deviceName + "\"";
+    authentication        += ", DeviceId=\"" + m_deviceId + "\"";
+    authentication        += ", Version=\"" + version() + "\"";
+    if (m_authenticated) {
+        authentication    += ", token=\"" + m_token + "\"";
+    }
+    request.setRawHeader("X-Emby-Authorization", authentication.toUtf8());
+}
+
+QNetworkReply *ApiClient::get(const QString &path, const QUrlQuery &params) {
+    QNetworkRequest req;
+    addBaseRequestHeaders(req, path, params);
+    qDebug() << "GET  " << req.url();
+    return m_naManager.get(req);
+}
+QNetworkReply *ApiClient::post(const QString &path, const QJsonDocument &data, const QUrlQuery &params) {
+
+    QNetworkRequest req;
+    req.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
+    addBaseRequestHeaders(req, path, params);
+    qDebug() << "POST " << req.url();
+    if (data.isEmpty())
+        return m_naManager.post(req, QByteArray());
+    else {
+        return m_naManager.post(req, data.toJson(QJsonDocument::Compact));
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// Nice to have methods                                                                           //
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void ApiClient::restoreSavedSession(){
+    QObject *ctx1 = new QObject(this);
+    connect(m_credManager, &CredentialsManager::serversListed, ctx1, [this, ctx1](const QStringList &servers) {
+        qDebug() << "Servers listed: " << servers;
+        if (servers.size() == 0) {
+            emit this->setupRequired();
+            return;
+        }
+
+        //FIXME: support multiple servers
+        QString server = servers[0];
+        this->m_baseUrl = server;
+        qDebug() << "Server: " << server;
+        QObject *ctx2 = new QObject(this);
+        connect(m_credManager, &CredentialsManager::usersListed, ctx2, [this, server, ctx2](const QStringList &users) {
+            if (users.size() == 0) {
+                emit this->setupRequired();
+                return;
+            }
+            //FIXME: support multiple users
+            QString user = users[0];
+            qDebug() << "User: " << user;
+
+            QObject *ctx3 = new QObject(this);
+            connect(m_credManager, &CredentialsManager::tokenRetrieved, ctx3, [this, ctx3]
+                    (const QString &server, const QString &user, const QString &token) {
+                Q_UNUSED(server)
+                this->m_token = token;
+                this->setUserId(user);
+                this->setAuthenticated(true);
+                this->postCapabilities();
+                disconnect(ctx3);
+            }, Qt::UniqueConnection);
+            m_credManager->get(server, user);
+            delete ctx2;
+        }, Qt::UniqueConnection);
+        m_credManager->listUsers(server);
+        qDebug() << "Listing users";
+        delete ctx1;
+    }, Qt::UniqueConnection);
+    qDebug() << "Listing servers";
+    m_credManager->listServers();
+}
+
+void ApiClient::setupConnection() {
+    // First detect redirects:
+    // Note that this is done without calling JellyfinApiClient::get since that automatically includes the base_url,
+    // which is something we want to avoid here.
+    QNetworkRequest req = QNetworkRequest(m_baseUrl);
+    req.setAttribute(QNetworkRequest::FollowRedirectsAttribute, true);
+    QNetworkReply *rep = m_naManager.get(req);
+    connect(rep, &QNetworkReply::finished, this, [rep, this](){
+        int status = statusCode(rep);
+        qDebug() << status;
+
+        QString newUrl = rep->url().toString();
+        // If the server wants to redirect us to their web interface, we have to chop the last part of the url off.
+        if (newUrl.endsWith("/web/index.html")) {
+            newUrl.chop(QString("/web/index.html").size());
+            this->setBaseUrl(newUrl);
+        }
+        this->getBrandingConfiguration();
+        rep->deleteLater();
+    });
+    connect(rep, &QNetworkReply::redirected, this, [req] (const QUrl &url) {
+        qDebug() << "Redirect from " << req.url() << " to " << url;
+    });
+    setDefaultErrorHandler(rep);
+}
+
+void ApiClient::getBrandingConfiguration() {
+    QNetworkReply *rep = get("/Branding/Configuration");
+    connect(rep, &QNetworkReply::finished, this, [rep, this]() {
+        qDebug() << "RESPONSE: " << statusCode(rep);
+        switch(statusCode(rep)) {
+            case 200:
+                QJsonDocument response = QJsonDocument::fromJson(rep->readAll());
+                if (response.isNull() || !response.isObject()) {
+                    emit this->connectionFailed(ApiError::JSON_ERROR);
+                } else {
+                    QJsonObject obj = response.object();
+                    if (obj.contains("LoginDisclaimer")) {
+                        qDebug() << "Login disclaimer: " << obj["LoginDisclaimer"];
+                        emit this->connectionSuccess(obj["LoginDisclaimer"].toString());
+                    } else {
+                        emit this->connectionSuccess("");
+                    }
+                }
+                break;
+        }
+        rep->deleteLater();
+    });
+    setDefaultErrorHandler(rep);
+}
+
+void ApiClient::authenticate(QString username, QString password, bool storeCredentials) {
+    QJsonObject requestData;
+
+    requestData["Username"] = username;
+    requestData["Pw"] = password;
+    QNetworkReply *rep = post("/Users/Authenticatebyname", QJsonDocument(requestData));
+    connect(rep, &QNetworkReply::finished, this, [rep, username, storeCredentials, this]() {
+        int status = rep->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
+        qDebug() << "Got reply with status code " << status;
+        if (status >= 200 && status < 300) {
+            QJsonObject authInfo = QJsonDocument::fromJson(rep->readAll()).object();
+            this->m_token = authInfo["AccessToken"].toString();
+
+            // Fool this class's addRequestheaders to add the token, without
+            // notifying QML that we're authenticated, to prevent other requests going first.
+            this->m_authenticated = true;
+            this->setUserId(authInfo["User"].toObject()["Id"].toString());
+            this->postCapabilities();
+            this->setAuthenticated(true);
+
+            if (storeCredentials) {
+                m_credManager->store(this->m_baseUrl, this->m_userId, this->m_token);
+            }
+        }
+        rep->deleteLater();
+    });
+    setDefaultErrorHandler(rep);
+}
+
+void ApiClient::deleteSession() {
+    QNetworkReply *rep = post("/Sessions/Logout");
+    connect(rep, &QNetworkReply::finished, this, [rep, this] {
+        m_credManager->remove(m_baseUrl, m_userId);
+        this->setAuthenticated(false);
+        emit this->setupRequired();
+        rep->deleteLater();
+    });
+}
+
+void ApiClient::fetchItem(const QString &id) {
+    QNetworkReply *rep = get("/Users/" + m_userId + "/Items/" + id);
+    connect(rep, &QNetworkReply::finished, this, [rep, id, this]() {
+        int status = statusCode(rep);
+        if (status >= 200 && status < 300) {
+            QJsonObject data = QJsonDocument::fromJson(rep->readAll()).object();
+            emit this->itemFetched(id, data);
+        }
+        rep->deleteLater();
+    });
+    connect(rep, static_cast<void (QNetworkReply::*)(QNetworkReply::NetworkError)>(&QNetworkReply::error),
+            this, [id, rep, this](QNetworkReply::NetworkError error) {
+        emit this->itemFetchFailed(id, error);
+        rep->deleteLater();
+    });
+}
+
+void ApiClient::postCapabilities() {
+    QJsonObject capabilities;
+    capabilities["SupportsPersistentIdentifier"] = false; // Technically untrue, but not implemented yet.
+    capabilities["SupportsMediaControl"] = false;
+    capabilities["SupportsSync"] = false;
+    capabilities["SupportsContentUploading"] = false;
+    capabilities["AppStoreUrl"] = "https://chris.netsoj.nl/projects/harbour-sailfin";
+    capabilities["IconUrl"] = "https://chris.netsoj.nl/static/img/logo.png";
+    capabilities["DeviceProfile"] = m_deviceProfile;
+    QNetworkReply *rep = post("/Sessions/Capabilities/Full", QJsonDocument(capabilities));
+    setDefaultErrorHandler(rep);
+}
+
+void ApiClient::generateDeviceProfile() {
+    QJsonObject root = DeviceProfile::generateProfile();
+    m_playbackDeviceProfile = QJsonObject(root);
+    root["Name"] = m_deviceName;
+    root["Id"] = m_deviceId;
+    root["FriendlyName"] = QSysInfo::prettyProductName();
+    QJsonArray playableMediaTypes;
+    playableMediaTypes.append("Audio");
+    playableMediaTypes.append("Video");
+    playableMediaTypes.append("Photo");
+    root["PlayableMediaTypes"] = playableMediaTypes;
+
+    m_deviceProfile = root;
+}
+
+void ApiClient::defaultNetworkErrorHandler(QNetworkReply::NetworkError error) {
+    QObject *signalSender = sender();
+    QNetworkReply *rep = dynamic_cast<QNetworkReply *>(signalSender);
+    if (rep != nullptr && statusCode(rep) == 401) {
+        this->setAuthenticated(false);
+        emit this->authenticationError(ApiError::INVALID_PASSWORD);
+    } else {
+        emit this->networkError(error);
+    }
+    rep->deleteLater();
+}
+
+void ApiClient::setAuthenticated(bool authenticated) {
+    this->m_authenticated = authenticated;
+    if (authenticated) m_webSocket->open();
+    emit authenticatedChanged(authenticated);
+}
+}

core/src/jellyfinapimodel.cpp

@@ -0,0 +1,223 @@
+/*
+Sailfin: a Jellyfin client written using Qt
+Copyright (C) 2020 Chris Josten
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "jellyfinapimodel.h"
+
+namespace Jellyfin {
+ApiModel::ApiModel(QString path, bool hasRecordResponse, bool addUserId, QObject *parent)
+    : QAbstractListModel (parent),
+      m_path(path),
+      m_hasRecordResponse(hasRecordResponse),
+      m_addUserId(addUserId){
+}
+
+void ApiModel::reload() {
+    this->setStatus(Loading);
+    m_startIndex = 0;
+    load(RELOAD);
+}
+
+void ApiModel::load(LoadType type) {
+    qDebug() << (type == RELOAD ? "RELOAD" : "LOAD_MORE");
+    if (m_apiClient == nullptr) {
+        qWarning() << "Please set the apiClient property before (re)loading";
+        return;
+    }
+    if (m_path.contains("{{user}}")) {
+        m_path = m_path.replace("{{user}}", m_apiClient->userId());
+    }
+    if (m_path.contains("{{show}}") && !m_show.isEmpty()) {
+        m_path = m_path.replace("{{show}}", m_show);
+    }
+    QUrlQuery query;
+    if (m_limit >= 0) {
+        query.addQueryItem("Limit", QString::number(m_limit));
+    } else {
+        query.addQueryItem("Limit", QString::number(DEFAULT_LIMIT));
+    }
+    if (m_startIndex > 0) {
+        query.addQueryItem("StartIndex", QString::number(m_startIndex));
+    }
+    if (!m_parentId.isEmpty()) {
+        query.addQueryItem("ParentId", m_parentId);
+    }
+    if (!m_sortBy.empty()) {
+        query.addQueryItem("SortBy", m_sortBy.join(","));
+    }
+    if (m_sortOrder != Unspecified) {
+        query.addQueryItem("SortOrder", m_sortOrder == Ascending ? "Ascending" : "Descending");
+    }
+    if (!m_imageTypes.empty()) {
+        query.addQueryItem("ImageTypes", m_imageTypes.join(","));
+    }
+    if (!m_fields.empty()) {
+        query.addQueryItem("Fields", m_fields.join(","));
+    }
+    if (!m_seasonId.isEmpty()) {
+        query.addQueryItem("seasonId", m_seasonId);
+    }
+    if (m_addUserId) {
+        query.addQueryItem("userId", m_apiClient->userId());
+    }
+    if (m_recursive) {
+        query.addQueryItem("Recursive", "true");
+    }
+    addQueryParameters(query);
+    QNetworkReply *rep = m_apiClient->get(m_path, query);
+    connect(rep, &QNetworkReply::finished, this, [this, type, rep]() {
+        QJsonDocument doc = QJsonDocument::fromJson(rep->readAll());
+        if (!m_hasRecordResponse) {
+            if (!doc.isArray()) {
+                qWarning() << "Object is not an array!";
+                this->setStatus(Error);
+                return;
+            }
+            this->m_array = doc.array();
+        } else {
+            if (!doc.isObject()) {
+                qWarning() << "Object is not an object!";
+                this->setStatus(Error);
+                return;
+            }
+            QJsonObject obj = doc.object();
+            if (!obj.contains("Items")) {
+                qWarning() << "Object doesn't contain items!";
+                this->setStatus(Error);
+                return;
+            }
+            if (m_limit < 0) {
+                //                                                              Javascript is beautiful
+                if (obj.contains("TotalRecordCount") && obj["TotalRecordCount"].isDouble()) {
+                    m_totalRecordCount = obj["TotalRecordCount"].toInt();
+                    m_startIndex += DEFAULT_LIMIT;
+                } else {
+                    qWarning() << "Record-response does not have a total record count";
+                    this->setStatus(Error);
+                    return;
+                }
+            }
+            if (!obj["Items"].isArray()) {
+                qWarning() << "Items is not an array!";
+                this->setStatus(Error);
+                return;
+            }
+            QJsonArray items = obj["Items"].toArray();
+            switch(type) {
+                case RELOAD:
+                    this->m_array = items;
+                    break;
+                case LOAD_MORE:
+                    this->beginInsertRows(QModelIndex(), m_array.size(), m_array.size() + items.size() - 1);
+                    // QJsonArray apparently doesn't allow concatenating lists like QList or std::vector
+                    foreach (const QJsonValue &val, items) {
+                        m_array.append(val);
+                    }
+                    this->endInsertRows();
+                    break;
+            }
+        }
+        if (type == RELOAD) {
+            generateFields();
+        }
+        this->setStatus(Ready);
+        rep->deleteLater();
+    });
+}
+
+void ApiModel::generateFields() {
+    if (m_array.size() == 0) return;
+    this->beginResetModel();
+    int i = Qt::UserRole + 1;
+    if (!m_array[0].isObject()) {
+        qWarning() << "Iterator is not an object?";
+        return;
+    }
+    // Walks over the keys in the first record and adds them to the rolenames.
+    // This assumes the back-end has the same keys for every record. I could technically
+    // go over all records to be really sure, but no-one got time for a O(n²) algorithm, so
+    // this heuristic hopefully suffices.
+    QJsonObject ob = m_array[0].toObject();
+    for (auto jt = ob.begin(); jt != ob.end(); jt++) {
+        QString keyName = jt.key();
+        keyName[0] = keyName[0].toLower();
+        QByteArray keyArr = keyName.toUtf8();
+        if (!m_roles.values().contains(keyArr)) {
+            m_roles.insert(i++, keyArr);
+            //qDebug() << m_path << " adding " << keyName << " as " << ( i - 1);
+        }
+    }
+    this->endResetModel();
+}
+
+QVariant ApiModel::data(const QModelIndex &index, int role) const {
+    // Ignore roles we don't know
+    if (role <= Qt::UserRole || role >= Qt::UserRole + m_roles.size()) return QVariant();
+    // Ignore invalid indices.
+    if (!index.isValid()) return QVariant();
+
+
+    QJsonObject obj = m_array.at(index.row()).toObject();
+
+    QString key = m_roles[role];
+    key[0] = key[0].toUpper();
+    if (obj.contains(key)) {
+        return obj[key].toVariant();
+    }
+    return QVariant();
+}
+
+bool ApiModel::canFetchMore(const QModelIndex &parent) const {
+    if (parent.isValid()) return false;
+    switch(m_status) {
+        case Uninitialised:
+        case Loading:
+            return false;
+        default:
+            break;
+    }
+
+    if (m_limit < 0) {
+        return m_startIndex <= m_totalRecordCount;
+    } else {
+        return false;
+    }
+
+}
+
+void ApiModel::fetchMore(const QModelIndex &parent) {
+    if (parent.isValid()) return;
+    this->setStatus(LoadingMore);
+    load(LOAD_MORE);
+}
+
+void ApiModel::addQueryParameters(QUrlQuery &query) { Q_UNUSED(query)}
+
+
+void registerModels(const char *URI) {
+    qmlRegisterUncreatableType<ApiModel>(URI, 1, 0, "ApiModel", "Is enum and base class");
+    qmlRegisterUncreatableType<SortOptions>(URI, 1, 0, "SortOptions", "Is enum");
+    qmlRegisterType<PublicUserModel>(URI, 1, 0, "PublicUserModel");
+    qmlRegisterType<UserViewModel>(URI, 1, 0, "UserViewModel");
+    qmlRegisterType<UserItemModel>(URI, 1, 0, "UserItemModel");
+    qmlRegisterType<UserItemLatestModel>(URI, 1, 0, "UserItemLatestModel");
+    qmlRegisterType<UserItemResumeModel>(URI, 1, 0, "UserItemResumeModel");
+    qmlRegisterType<ShowSeasonsModel>(URI, 1, 0, "ShowSeasonsModel");
+    qmlRegisterType<ShowEpisodesModel>(URI, 1, 0, "ShowEpisodesModel");
+}
+}

core/src/jellyfindeviceprofile.cpp

@@ -0,0 +1,191 @@
+/*
+Sailfin: a Jellyfin client written using Qt
+Copyright (C) 2020 Chris Josten
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "jellyfindeviceprofile.h"
+
+namespace Jellyfin {
+
+bool DeviceProfile::supportsHls() {
+    return true;
+}
+
+bool DeviceProfile::canPlayH264() {
+    return true;
+}
+
+bool DeviceProfile::canPlayAc3() {
+    return true;
+}
+
+bool DeviceProfile::supportsMp3VideoAudio() {
+    qDebug() << "Mp3VideoAudio: " << QMediaPlayer::hasSupport("video/mp4", {"avc1.640029", "mp3"}, QMediaPlayer::StreamPlayback);
+    return true;
+}
+
+int DeviceProfile::maxStreamingBitrate() {
+    return 5000000;
+}
+
+QJsonObject DeviceProfile::generateProfile() {
+    using JsonPair = QPair<QString, QJsonValue>;
+    QJsonObject profile;
+
+    QStringList videoAudioCodecs;
+    QStringList mp4VideoCodecs;
+    QStringList hlsVideoCodecs;
+    QStringList hlsVideoAudioCodecs;
+
+    if (canPlayH264()) {
+        mp4VideoCodecs.append("h264");
+        hlsVideoCodecs.append("h264");
+    }
+
+    if (canPlayAc3()) {
+        videoAudioCodecs.append("ac3");
+        hlsVideoAudioCodecs.append("ac3");
+    }
+
+    if (supportsMp3VideoAudio()) {
+        videoAudioCodecs.append("mp3");
+        hlsVideoAudioCodecs.append("mp3");
+    }
+
+    QJsonArray codecProfiles = {};
+    codecProfiles.append(QJsonObject {
+                             JsonPair("Codec", "aac"),
+                             JsonPair("Conditions", QJsonArray {
+                                 QJsonObject {
+                                     JsonPair("Property", "IsSecondaryAudio"),
+                                     JsonPair("Condition", "Equals"),
+                                     JsonPair("Value", false),
+                                     JsonPair("IsRequired", false)
+                                 }
+                             }),
+                             JsonPair("Type", "VideoAudio")
+                         });
+    codecProfiles.append(QJsonObject {
+                             JsonPair("Coded", "h264"),
+                             JsonPair("Conditions", QJsonArray {
+                                 QJsonObject {
+                                     JsonPair("Property", "IsAnamorphic"),
+                                     JsonPair("Condition", "NotEquals"),
+                                     JsonPair("Value", true),
+                                     JsonPair("IsRequired", false)
+                                 },
+                                 QJsonObject {
+                                     JsonPair("Property", "VideoProfile"),
+                                     JsonPair("Condition", "EqualsAny"),
+                                     JsonPair("Value", "baseline|constrained baseline"), //"high|main|baseline|constrained baseline"),
+                                     JsonPair("IsRequired", false),
+                                 },
+                                 QJsonObject {
+                                     JsonPair("Property", "VideoLevel"),
+                                     JsonPair("Condition", "LessThanEqual"),
+                                     JsonPair("Value", 51),
+                                     JsonPair("IsRequired", false)
+                                 },
+                                 QJsonObject {
+                                     JsonPair("Property", "IsInterlaced"),
+                                     JsonPair("Condition", "NotEquals"),
+                                     JsonPair("Value", true),
+                                     JsonPair("IsRequired", false)
+                                 }
+                             }),
+                             JsonPair("Type", "Video")
+                         });
+
+    QJsonArray transcodingProfiles = {};
+
+    // Hard coded nr 1:
+    QJsonObject transcoding1;
+    transcoding1["AudioCodec"] = "aac";
+    transcoding1["BreakOnNonKeyFrames"] =true;
+    transcoding1["Container"] = "ts";
+    transcoding1["Context"] = "Streaming";
+    transcoding1["MaxAudioChannels"] = 2;
+    transcoding1["MinSegments"] = 1;
+    transcoding1["Protocol"] = "hls";
+    transcoding1["Type"] = "Audio";
+    transcodingProfiles.append(transcoding1);
+
+    // Hard code nr 2
+    transcodingProfiles.append(QJsonObject({
+                                    JsonPair("AudioCodec", "mp3,aac"),
+                                    JsonPair("BreakOnNonKeyFrames", true),
+                                    JsonPair("Container", "ts"),
+                                    JsonPair("Context", "Streaming"),
+                                    JsonPair("MaxAudioChannels", 2),
+                                    JsonPair("MinSegments", 1),
+                                    JsonPair("Protocol", "hls"),
+                                    JsonPair("Type", "Video"),
+                                    JsonPair("VideoCodec", "h264")
+                               }));
+
+    // Fallback
+    transcodingProfiles.append(QJsonObject {
+                                    JsonPair("Container", "mp4"),
+                                    JsonPair("Type", "Video"),
+                                    JsonPair("AudioCodec", videoAudioCodecs.join(',')),
+                                    JsonPair("VideoCodec", "h264"),
+                                    JsonPair("Context", "Static"),
+                                    JsonPair("Protocol", "http")
+                                });
+
+
+    if (supportsHls() && !hlsVideoAudioCodecs.isEmpty()) {
+        transcodingProfiles.append(QJsonObject {
+                                       JsonPair("Container", "ts"),
+                                       JsonPair("Type", "Video"),
+                                       JsonPair("AudioCodec", hlsVideoAudioCodecs.join(",")),
+                                       JsonPair("VideoCodec", hlsVideoCodecs.join(",")),
+                                       JsonPair("Context", "Streaming"),
+                                       JsonPair("Protocol", "hls"),
+                                       JsonPair("MaxAudioChannels", 2),
+                                       JsonPair("MinSegments", 1),
+                                       JsonPair("BreakOnNonKeyFrames", true)
+                                   });
+    }
+
+    // Response profiles (or whatever it actually does?)
+    QJsonArray responseProfiles = {};
+    responseProfiles.append(QJsonObject({
+                                JsonPair("Type", "Video"),
+                                JsonPair("Container", "m4v"),
+                                JsonPair("MimeType", "video/mp4")
+                            }));
+
+    // Direct play profiles
+    QJsonArray directPlayProfiles;
+    directPlayProfiles.append(QJsonObject {
+                                  JsonPair("Container", "mp4,m4v"),
+                                  JsonPair("Type", "Video"),
+                                  JsonPair("VideoCodec", mp4VideoCodecs.join(',')),
+                                  JsonPair("AudioCodec", videoAudioCodecs.join(','))
+                              });
+
+    profile["CodecProfiles"] = codecProfiles;
+    profile["ContainerProfiles"] = QJsonArray();
+    profile["DirectPlayProfiles"] = directPlayProfiles;
+    profile["ResponseProfiles"] = responseProfiles;
+    profile["SubtitleProfiles"] = QJsonArray();
+    profile["TranscodingProfiles"] = transcodingProfiles;
+    profile["MaxStreamingBitrate"] = maxStreamingBitrate();
+    return profile;
+}
+}

core/src/jellyfinitem.cpp

@@ -0,0 +1,263 @@
+#include "jellyfinitem.h"
+
+namespace Jellyfin {
+const QRegularExpression JsonSerializable::m_listExpression = QRegularExpression("^QList<\\s*([a-zA-Z0-9]*)\\s*\\*?\\s*>$");
+JsonSerializable::JsonSerializable(QObject *parent) : QObject(parent) {
+}
+
+void JsonSerializable::deserialize(const QJsonObject &jObj) {
+    const QMetaObject *obj = this->metaObject();
+
+    // Loop over each property,
+    for (int i = 0; i < obj->propertyCount(); i++) {
+        QMetaProperty prop = obj->property(i);
+        // Skip properties which are not stored (usually derrived of other properties)
+        if (!prop.isStored()) continue;
+        if (!prop.isWritable()) continue;
+
+        qDebug() << toPascalCase(prop.name());
+        // Hardcoded exception for the property id, since its special inside QML
+        if (QString(prop.name()) == "jellyfinId" && jObj.contains("Id")) {
+            QJsonValue val = jObj["Id"];
+            prop.write(this, jsonToVariant(prop, val, jObj));
+        } else if (jObj.contains(toPascalCase(prop.name()))) {
+            QJsonValue val = jObj[toPascalCase(prop.name())];
+            prop.write(this, jsonToVariant(prop, val, jObj));
+        } else if (QString(prop.name()).startsWith("__list__")) {
+            // QML doesn't like it if we expose properties of type QList<SubclassOfQobject *>
+            // we need to explicitly cast them to QList<QObject *> or QQmlListProperty, which sucks.
+            // That's why we have a special case for properties starting with __list__. This contains
+            // the actual QList<SubclassOfQobject *>, so that qml can access the object with its real name.
+            QString realName = toPascalCase(prop.name() + 8);
+            if (!jObj.contains(realName)) {
+                qDebug() << "Ignoring " << realName << " - " << prop.name();
+                continue;
+            }
+            QJsonValue val = jObj[realName];
+            qDebug() << realName << " - " << prop.name() << ": " << val;
+            QMetaProperty realProp = obj->property(obj->indexOfProperty(prop.name() + 8));
+            if (!realProp.write(this, jsonToVariant(prop, val, jObj))) {
+                qDebug() << "Write to " << prop.name() << "failed";
+            };
+        } else {
+            qDebug() << "Ignored " << prop.name() << " while deserializing";
+        }
+    }
+}
+
+QVariant JsonSerializable::jsonToVariant(QMetaProperty prop, const QJsonValue &val, const QJsonObject &root) {
+    switch(val.type()) {
+    case QJsonValue::Null:
+    case QJsonValue::Undefined:
+        return QVariant();
+    case QJsonValue::Bool:
+    case QJsonValue::Double:
+    case QJsonValue::String:
+        return val.toVariant();
+    case QJsonValue::Array:
+        {
+            QJsonArray arr = val.toArray();
+            QVariantList varArr;
+            for (auto it = arr.constBegin(); it < arr.constEnd(); it++) {
+                QVariant variant = jsonToVariant(prop, *it, root);
+                qDebug() << variant;
+                varArr.append(variant);
+            }
+            qDebug() << prop.name() << ": " << varArr.count();
+            return QVariant(varArr);
+        }
+    case QJsonValue::Object:
+        QJsonObject innerObj = val.toObject();
+        int typeNo = prop.userType();
+        const QMetaObject *metaType = QMetaType::metaObjectForType(prop.userType());
+        if (metaType == nullptr) {
+            // Try to determine if the type is a qlist
+            QRegularExpressionMatch match = m_listExpression.match(prop.typeName());
+            if (match.hasMatch()) {
+                // It is a qList! Now extract the inner type
+                // There should be an easier way, shouldn't there?
+                QString listType = match.captured(1).prepend("Jellyfin::").append("*");
+                // UGLY CODE HERE WE COME
+                typeNo = QMetaType::type(listType.toUtf8());
+                if (typeNo == QMetaType::UnknownType) {
+                    qDebug() << "Unknown type: " << listType;
+                    return QVariant();
+                }
+                metaType = QMetaType::metaObjectForType(typeNo);
+            } else {
+                qDebug() << "No metaObject for " << prop.typeName() << ", " << prop.type() << ", " << prop.userType();
+                return QVariant();
+            }
+        }
+        QObject *deserializedInnerObj = metaType->newInstance();
+        deserializedInnerObj->setParent(this);
+        if (JsonSerializable *ser = dynamic_cast<JsonSerializable *>(deserializedInnerObj)) {
+            qDebug() << "Deserializing user type " << deserializedInnerObj->metaObject()->className();
+            ser->deserialize(innerObj);
+            return QVariant(typeNo, &ser);
+        } else {
+            deserializedInnerObj->deleteLater();
+            qDebug() << "Object is not a serializable one!";
+            return QVariant();
+        }
+    }
+    return QVariant();
+}
+
+QJsonObject JsonSerializable::serialize() const {
+    QJsonObject result;
+    const QMetaObject *obj = this->metaObject();
+    for (int i = 0; i < obj->propertyCount(); i++) {
+        QMetaProperty prop = obj->property(i);
+        if (QString(prop.name()) == "jellyfinId") {
+            result["Id"] = variantToJson(prop.read(this));
+        } else {
+            result[toPascalCase(prop.name())] = variantToJson(prop.read(this));
+        }
+    }
+    return result;
+}
+
+QJsonValue JsonSerializable::variantToJson(const QVariant var) const {
+    switch(var.type()) {
+    case QVariant::Invalid:
+        return QJsonValue();
+    case QVariant::UserType:
+        if (var.canConvert<JsonSerializable *>()) {
+             JsonSerializable * obj = var.value<JsonSerializable *>();
+             return obj->serialize();
+        } else {
+            qWarning() << "Not serializable: " << var.typeName();
+            return QJsonValue();
+        }
+    case QVariant::Bool:
+        return var.toBool();
+    case QVariant::List:
+    {
+        QVariantList list = var.toList();
+        QJsonArray arr;
+        for (auto it = list.begin(); it < list.end(); it++) {
+            arr << variantToJson(*it);
+        }
+        return arr;
+    }
+    default:
+        if (var.canConvert(QVariant::Double)) {
+            return var.toDouble();
+        } if (var.canConvert(QVariant::String)) {
+            return var.toString();
+        } else {
+            return QJsonValue();
+        }
+    }
+}
+
+QString JsonSerializable::toPascalCase(QString str) {
+    str[0] = str[0].toUpper();
+    return str;
+}
+
+QString JsonSerializable::fromPascalCase(QString str) {
+    str[0] = str[0].toLower();
+    return str;
+}
+
+
+// RemoteData
+RemoteData::RemoteData(QObject *parent) : JsonSerializable (parent) {}
+
+void RemoteData::setStatus(Status newStatus) {
+    m_status = newStatus;
+    emit statusChanged(newStatus);
+}
+
+void RemoteData::setError(QNetworkReply::NetworkError error) {
+    m_error = error;
+    emit errorChanged(error);
+}
+
+void RemoteData::setErrorString(const QString &newErrorString) {
+    m_errorString = newErrorString;
+    emit errorStringChanged(newErrorString);
+}
+
+void RemoteData::setApiClient(ApiClient *newApiClient) {
+    m_apiClient = newApiClient;
+    emit apiClientChanged(newApiClient);
+    reload();
+}
+
+// MediaStream
+MediaStream::MediaStream(QObject *parent) : JsonSerializable (parent) {}
+MediaStream::MediaStream(const MediaStream &other)
+    : JsonSerializable (other.parent()),
+      m_codec(other.m_codec),
+      m_codecTag(other.m_codecTag),
+      m_language(other.m_language),
+      m_displayTitle(other.m_displayTitle),
+      m_type(other.m_type),
+      m_index(other.m_index){
+}
+bool MediaStream::operator==(const MediaStream &other) {
+    // displayTitle is explicitly left out, since it's generated based on other properties
+    // in the Jellyfin source code.
+    return m_codec == other.m_codec && m_codecTag == other.m_codecTag
+            && m_language == other.m_language && m_type == other.m_type
+            && m_index == other.m_index;
+}
+
+// Item
+
+Item::Item(QObject *parent) : RemoteData(parent) {}
+
+
+void Item::setJellyfinId(QString newId) {
+    m_id = newId.trimmed();
+    if (m_id != newId) {
+        emit jellyfinIdChanged(m_id);
+        reload();
+    }
+}
+
+void Item::reload() {
+    if (m_id.isEmpty() || m_apiClient == nullptr) {
+        setStatus(Uninitialised);
+        return;
+    } else {
+        setStatus(Loading);
+    }
+    QNetworkReply *rep = m_apiClient->get("/Users/" + m_apiClient->userId() + "/Items/" + m_id);
+    connect(rep, &QNetworkReply::finished, this, [this, rep]() {
+        rep->deleteLater();
+
+        QJsonParseError error;
+        QString data(rep->readAll());
+        data = data.normalized(QString::NormalizationForm_D);
+        QJsonDocument doc = QJsonDocument::fromJson(data.toUtf8(), &error);
+        if (doc.isNull()) {
+            this->setError(QNetworkReply::ProtocolFailure);
+            this->setErrorString(error.errorString());
+            return;
+        }
+        if (!doc.isObject()) {
+            this->setError(QNetworkReply::ProtocolFailure);
+            this->setErrorString(tr("Invalid response from the server: root element is not an object."));
+            return;
+        }
+        this->deserialize(doc.object());
+        this->setStatus(Ready);
+    });
+    connect(rep, static_cast<void (QNetworkReply::*)(QNetworkReply::NetworkError)>(&QNetworkReply::error),
+            this, [this, rep](QNetworkReply::NetworkError error) {
+        rep->deleteLater();
+        this->setError(error);
+        this->setErrorString(rep->errorString());
+        this->setStatus(Error);
+    });
+}
+
+void registerSerializableJsonTypes(const char* URI) {
+    qmlRegisterType<MediaStream>(URI, 1, 0, "MediaStream");
+    qmlRegisterType<Item>(URI, 1, 0, "JellyfinItem");
+}
+}

core/src/jellyfinplaybackmanager.cpp

@@ -0,0 +1,163 @@
+/*
+Sailfin: a Jellyfin client written using Qt
+Copyright (C) 2020 Chris Josten
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "jellyfinplaybackmanager.h"
+
+namespace Jellyfin {
+
+PlaybackManager::PlaybackManager(QObject *parent)
+    : QObject(parent) {
+    m_updateTimer.setInterval(10000); // 10 seconds
+    m_updateTimer.setSingleShot(false);
+    connect(&m_updateTimer, &QTimer::timeout, this, &PlaybackManager::updatePlaybackInfo);
+}
+
+void PlaybackManager::fetchStreamUrl() {
+    QUrlQuery params;
+    params.addQueryItem("UserId", m_apiClient->userId());
+    params.addQueryItem("StartTimeTicks", QString::number(m_position));
+    params.addQueryItem("IsPlayback", "true");
+    params.addQueryItem("AutoOpenLiveStream", this->m_autoOpen ? "true" : "false");
+    params.addQueryItem("MediaSourceId", this->m_itemId);
+    params.addQueryItem("SubtitleStreamIndex", QString::number(m_subtitleIndex));
+    params.addQueryItem("AudioStreamIndex", QString::number(m_audioIndex));
+
+    QJsonObject root;
+    root["DeviceProfile"] = m_apiClient->playbackDeviceProfile();
+
+    QNetworkReply *rep = m_apiClient->post("/Items/" + this->m_itemId + "/PlaybackInfo", QJsonDocument(root), params);
+    connect(rep, &QNetworkReply::finished, this, [this, rep]() {
+        QJsonObject root = QJsonDocument::fromJson(rep->readAll()).object();
+        this->m_playSessionId = root["PlaySessionId"].toString();
+        qDebug() << "Session id: " << this->m_playSessionId;
+
+        if (this->m_autoOpen) {
+            QJsonArray mediaSources = root["MediaSources"].toArray();
+            //FIXME: relies on the fact that the returned transcode url always has a query!
+            this->m_streamUrl = this->m_apiClient->baseUrl()
+                    + mediaSources[0].toObject()["TranscodingUrl"].toString();
+
+            this->m_playMethod = Transcode;
+            emit this->streamUrlChanged(this->m_streamUrl);
+            qDebug() << "Found stream url: " << this->m_streamUrl;
+        }
+
+        rep->deleteLater();
+    });
+}
+
+void PlaybackManager::setItemId(const QString &newItemId) {
+    if (m_apiClient == nullptr) {
+        qWarning() << "apiClient is not set on this MediaSource instance! Aborting.";
+        return;
+    }
+
+    this->m_itemId = newItemId;
+    // Deinitialize the streamUrl
+    setStreamUrl("");
+    if (!newItemId.isEmpty()) {
+        fetchStreamUrl();
+    }
+}
+
+void PlaybackManager::setStreamUrl(const QString &streamUrl) {
+    this->m_streamUrl = streamUrl;
+    emit streamUrlChanged(streamUrl);
+}
+
+void PlaybackManager::setPosition(qint64 position) {
+    if (position == 0 && m_position != 0) {
+        // Save the old position when stop gets called. The QMediaPlayer will try to set
+        // position to 0 when stopped, but we don't want to report that to Jellyfin. We
+        // want the old position.
+        m_stopPosition = m_position;
+    }
+    m_position = position;
+    emit positionChanged(position);
+}
+
+void PlaybackManager::setState(QMediaPlayer::State newState) {
+    if (m_state == newState) return;
+    if (m_state == QMediaPlayer::StoppedState) {
+        // We're transitioning from stopped to either playing or paused.
+        // Set up the recurring timer
+        m_updateTimer.start();
+        postPlaybackInfo(Started);
+    } else if (newState == QMediaPlayer::StoppedState) {
+        // We've stopped playing the media. Post a stop signal.
+        m_updateTimer.stop();
+        postPlaybackInfo(Stopped);
+    } else {
+        postPlaybackInfo(Progress);
+    }
+
+
+    m_state = newState;
+    emit this->stateChanged(newState);
+}
+
+void PlaybackManager::updatePlaybackInfo() {
+    postPlaybackInfo(Progress);
+}
+
+void PlaybackManager::postPlaybackInfo(PlaybackInfoType type) {
+    QJsonObject root;
+
+    root["ItemId"] = m_itemId;
+    root["SessionId"] = m_playSessionId;
+
+    switch(type) {
+    case Started: // FALLTHROUGH
+    case Progress:
+
+        root["IsPaused"] = m_state != QMediaPlayer::PlayingState;
+        root["IsMuted"] = false;
+
+        root["AudioStreamIndex"] = m_audioIndex;
+        root["SubtitleStreamIndex"] = m_subtitleIndex;
+
+        root["PlayMethod"] = QVariant::fromValue(m_playMethod).toString();
+        root["PositionTicks"] = m_position;
+        break;
+    case Stopped:
+        root["PositionTicks"] = m_stopPosition;
+        break;
+    }
+
+    QString path;
+    switch (type) {
+    case Started:
+        path = "/Sessions/Playing";
+        break;
+    case Progress:
+        path = "/Sessions/Playing/Progress";
+        break;
+    case Stopped:
+        path = "/Sessions/Playing/Stopped";
+        break;
+    }
+
+    QNetworkReply *rep = m_apiClient->post(path, QJsonDocument(root));
+    connect(rep, &QNetworkReply::finished, this, [rep](){
+        rep->deleteLater();
+    });
+    m_apiClient->setDefaultErrorHandler(rep);
+}
+
+}

core/src/jellyfinwebsocket.cpp

@@ -0,0 +1,114 @@
+/*
+Sailfin: a Jellyfin client written using Qt
+Copyright (C) 2020 Chris Josten
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#include "jellyfinwebsocket.h"
+
+namespace Jellyfin {
+WebSocket::WebSocket(ApiClient *client)
+    : QObject (client), m_apiClient(client){
+    connect(&m_webSocket, &QWebSocket::connected, this, &WebSocket::onConnected);
+    connect(&m_webSocket, &QWebSocket::disconnected, this, &WebSocket::onDisconnected);
+    connect(&m_webSocket, static_cast<void (QWebSocket::*)(QAbstractSocket::SocketError)>(&QWebSocket::error),
+            this, [this](QAbstractSocket::SocketError error) {
+        Q_UNUSED(error)
+        qDebug() << "Connection error: " <<  m_webSocket.errorString();
+    });
+}
+
+void WebSocket::open() {
+    QUrlQuery query;
+    query.addQueryItem("api_key", m_apiClient->token());
+    query.addQueryItem("deviceId", m_apiClient->m_deviceId);
+    QUrl connectionUrl(m_apiClient->baseUrl());
+    connectionUrl.setScheme(connectionUrl.scheme() == "http" ? "ws" : "wss");
+    connectionUrl.setPath("/socket");
+    connectionUrl.setQuery(query);
+    m_webSocket.open(connectionUrl);
+    qDebug() << "Opening WebSocket connection to " << m_webSocket.requestUrl();
+}
+
+void WebSocket::onConnected() {
+    connect(&m_webSocket, &QWebSocket::textMessageReceived, this, &WebSocket::textMessageReceived);
+}
+
+void WebSocket::onDisconnected() {
+    disconnect(&m_webSocket, &QWebSocket::textMessageReceived, this, &WebSocket::textMessageReceived);
+    m_keepAliveTimer.stop();
+}
+
+void WebSocket::textMessageReceived(const QString &message) {
+    QJsonDocument doc = QJsonDocument::fromJson(message.toUtf8());
+    if (doc.isNull() || !doc.isObject()) {
+        qWarning() << "Malformed message received over WebSocket: parse error or root not an object.";
+        return;
+    }
+    QJsonObject messageRoot = doc.object();
+    if (!messageRoot.contains("MessageType") || !messageRoot.contains("Data")) {
+        qWarning() << "Malformed message received over WebSocket: no MessageType and Data set.";
+        return;
+    }
+
+    // Convert the type so we can use it in our enums.
+    QString messageTypeStr = messageRoot["MessageType"].toString();
+    bool ok;
+    MessageType messageType = static_cast<MessageType>(QMetaEnum::fromType<WebSocket::MessageType>().keyToValue(messageTypeStr.toLatin1(), &ok));
+    if (!ok) {
+        qWarning() << "Unknown message arrived: " << messageTypeStr;
+        return;
+    }
+
+    QJsonValue data = messageRoot["Data"];
+    qDebug() << "Received message: " << messageTypeStr;
+
+    switch (messageType) {
+    case ForceKeepAlive:
+        setupKeepAlive(data.toInt(-1));
+        break;
+    case KeepAlive:
+        //TODO: do something?
+        break;
+    }
+
+}
+
+void WebSocket::sendKeepAlive() {
+    sendMessage(KeepAlive);
+}
+
+void WebSocket::setupKeepAlive(int data) {
+    // Data is timeout in seconds, we want to send a keepalive at half the timeout
+    m_keepAliveTimer.setInterval(data * 500);
+    m_keepAliveTimer.setSingleShot(false);
+    connect(&m_keepAliveTimer, &QTimer::timeout, this, &WebSocket::sendKeepAlive);
+    m_keepAliveTimer.start();
+    sendKeepAlive();
+}
+
+QString WebSocket::generateMessageId() {
+    return QUuid::createUuid().toString();
+}
+
+void WebSocket::sendMessage(MessageType type, QJsonValue data) {
+    QJsonObject root;
+    root["MessageType"] = QVariant::fromValue(type).toString();
+    root["Data"] = data;
+    QString message = QJsonDocument(root).toJson(QJsonDocument::Compact);
+    m_webSocket.sendTextMessage(message);
+    qDebug() << "Sent message: " << message;
+}
+}

core/src/serverdiscoverymodel.cpp

@@ -0,0 +1,93 @@
+/*
+Sailfin: a Jellyfin client written using Qt
+Copyright (C) 2020 Chris Josten
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+#include "serverdiscoverymodel.h"
+
+namespace Jellyfin {
+ServerDiscoveryModel::ServerDiscoveryModel(QObject *parent)
+    : QAbstractListModel (parent) {
+    connect(&m_socket, &QUdpSocket::readyRead, this, &ServerDiscoveryModel::on_datagramsAvailable);
+    m_socket.bind(BROADCAST_PORT);
+}
+
+QVariant ServerDiscoveryModel::data(const QModelIndex &index, int role) const {
+    if (index.row() < 0 || index.row() >= rowCount()) return QVariant();
+    size_t row = static_cast<size_t>(index.row());
+
+    switch(role) {
+    case ROLE_ADDRESS:
+        return m_discoveredServers[row].address;
+    case ROLE_ID:
+        return m_discoveredServers[row].id;
+    case ROLE_NAME:
+        return m_discoveredServers[row].name;
+    default:
+        return QVariant();
+    }
+}
+
+void ServerDiscoveryModel::refresh() {
+    this->beginResetModel();
+    this->m_discoveredServers.clear();
+    this->endResetModel();
+
+    m_socket.writeDatagram(MAGIC_PACKET, QHostAddress::Broadcast, BROADCAST_PORT);
+}
+
+void ServerDiscoveryModel::on_datagramsAvailable() {
+    int beginIndex = static_cast<int>(m_discoveredServers.size());
+
+    QByteArray datagram;
+    QJsonDocument jsonDocument;
+    QJsonParseError jsonParseError;
+    QHostAddress replyAddress;
+    std::vector<ServerDiscovery> discoveredServers;
+
+    while (m_socket.hasPendingDatagrams()) {
+        datagram.resize(static_cast<int>(m_socket.pendingDatagramSize()));
+        m_socket.readDatagram(datagram.data(), datagram.size(), &replyAddress);
+
+        jsonDocument = QJsonDocument::fromJson(datagram, &jsonParseError);
+        // Check if parsing failed
+        if (jsonDocument.isNull()) {
+            qDebug() << "Invalid response from " << replyAddress.toString() << ": " << jsonParseError.errorString();
+            continue;
+        }
+
+        if (jsonDocument.isObject()) {
+            QJsonObject rootObject = jsonDocument.object();
+            if (rootObject.contains("Name") && rootObject.contains("Address") && rootObject.contains("Id")) {
+                // We (assume) we have a correct response! Add it to the back of our temporary vector with discovered servers
+                discoveredServers.push_back(ServerDiscovery {
+                                                  rootObject["Name"].toString(),
+                                                  rootObject["Address"].toString(),
+                                                  rootObject["Id"].toString()
+                                              });
+            } else {
+                qDebug() << "Invalid response from " << replyAddress.toString() << ": does not contain Name, Address, or Id field";
+            }
+        } else {
+            qDebug() << "Invalid response from " << replyAddress.toString() << ": root is not an object";
+        }
+    }
+
+    beginInsertRows(QModelIndex(), beginIndex, beginIndex + static_cast<int>(discoveredServers.size()) - 1);
+    m_discoveredServers.insert(m_discoveredServers.end(), discoveredServers.begin(), discoveredServers.end());
+    endInsertRows();
+};
+}