Finish preliminary offline support

* ProgressProvider now has an abort() call
* Abort button support added to the progress dialog
* YggdrasilTask and MojangAccount adapted to support abort

YggdrasilTask will time out after 10 seconds of no network activity, or when the user pushes the Play Offline button.
In offline mode, all instance update tasks are skipped! This will need further work.

8 files changed, 130 insertions, 124 deletions

diff --git a/logic/auth/MojangAccount.cpp b/logic/auth/MojangAccount.cpp
index 9ab71077..b1acfb25 100644
--- a/logic/auth/MojangAccount.cpp
+++ b/logic/auth/MojangAccount.cpp
@@ -134,22 +134,21 @@ AccountStatus MojangAccount::accountStatus() const
 	return Online;
 }
 
-bool MojangAccount::login(QString password)
+std::shared_ptr<Task> MojangAccount::login(QString password)
 {
 	if(m_currentTask)
-		return false;
+		return m_currentTask;
 	if(password.isEmpty())
 	{
-		m_currentTask.reset(new RefreshTask(this, this));
+		m_currentTask.reset(new RefreshTask(this));
 	}
 	else
 	{
-		m_currentTask.reset(new AuthenticateTask(this, password, this));
+		m_currentTask.reset(new AuthenticateTask(this, password));
 	}
 	connect(m_currentTask.get(), SIGNAL(succeeded()), SLOT(authSucceeded()));
 	connect(m_currentTask.get(), SIGNAL(failed(QString)), SLOT(authFailed(QString)));
-	m_currentTask->start();
-	return true;
+	return m_currentTask;
 }
 
 void MojangAccount::authSucceeded()
@@ -161,8 +160,13 @@ void MojangAccount::authSucceeded()
 
 void MojangAccount::authFailed(QString reason)
 {
-	m_online = false;
-	m_accessToken = QString();
+	// This is emitted when the yggdrasil tasks time out or are cancelled.
+	// -> we treat the error as no-op
+	if(reason != "Yggdrasil task cancelled.")
+	{
+		m_online = false;
+		m_accessToken = QString();
+		emit changed();
+	}
 	m_currentTask.reset();
-	emit changed();
 }
diff --git a/logic/auth/MojangAccount.h b/logic/auth/MojangAccount.h
index 751aafe5..8c44ce58 100644
--- a/logic/auth/MojangAccount.h
+++ b/logic/auth/MojangAccount.h
@@ -23,6 +23,7 @@
 
 #include <memory>
 
+class Task;
 class YggdrasilTask;
 class MojangAccount;
 
@@ -94,7 +95,7 @@ public: /* manipulation */
 	 * Attempt to login. Empty password means we use the token.
 	 * If the attempt fails because we already are performing some task, it returns false.
 	 */
-	bool login(QString password = QString());
+	std::shared_ptr<Task> login(QString password = QString());
 
 public: /* queries */
 	const QString &username() const
diff --git a/logic/auth/YggdrasilTask.cpp b/logic/auth/YggdrasilTask.cpp
index e06ae182..6b938ea7 100644
--- a/logic/auth/YggdrasilTask.cpp
+++ b/logic/auth/YggdrasilTask.cpp
@@ -30,12 +30,6 @@ YggdrasilTask::YggdrasilTask(MojangAccount *account, QObject *parent)
 {
 }
 
-YggdrasilTask::~YggdrasilTask()
-{
-	if (m_error)
-		delete m_error;
-}
-
 void YggdrasilTask::executeTask()
 {
 	setStatus(getStateMessage(STATE_SENDING_REQUEST));
@@ -44,107 +38,124 @@ void YggdrasilTask::executeTask()
 	QJsonDocument doc(getRequestContent());
 
 	auto worker = MMC->qnam();
-	connect(worker.get(), SIGNAL(finished(QNetworkReply *)), this,
-			SLOT(processReply(QNetworkReply *)));
-
 	QUrl reqUrl("https://authserver.mojang.com/" + getEndpoint());
 	QNetworkRequest netRequest(reqUrl);
 	netRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");
 
 	QByteArray requestData = doc.toJson();
 	m_netReply = worker->post(netRequest, requestData);
+	connect(m_netReply, &QNetworkReply::finished, this, &YggdrasilTask::processReply);
+	connect(m_netReply, &QNetworkReply::uploadProgress, this, &YggdrasilTask::refreshTimers);
+	connect(m_netReply, &QNetworkReply::downloadProgress, this, &YggdrasilTask::refreshTimers);
+	timeout_keeper.setSingleShot(true);
+	timeout_keeper.start(timeout_max);
+	counter.setSingleShot(false);
+	counter.start(time_step);
+	progress(0, timeout_max);
+	connect(&timeout_keeper, &QTimer::timeout, this, &YggdrasilTask::abort);
+	connect(&counter, &QTimer::timeout, this, &YggdrasilTask::heartbeat);
 }
 
-void YggdrasilTask::processReply(QNetworkReply *reply)
+void YggdrasilTask::refreshTimers(qint64, qint64)
 {
-	setStatus(getStateMessage(STATE_PROCESSING_RESPONSE));
+	timeout_keeper.stop();
+	timeout_keeper.start(timeout_max);
+	progress(count = 0, timeout_max);
+}
+void YggdrasilTask::heartbeat()
+{
+	count += time_step;
+	progress(count, timeout_max);
+}
 
-	if (m_netReply != reply)
-		// Wrong reply for some reason...
-		return;
+void YggdrasilTask::abort()
+{
+	progress(timeout_max, timeout_max);
+	m_netReply->abort();
+}
+
+void YggdrasilTask::processReply()
+{
+	setStatus(getStateMessage(STATE_PROCESSING_RESPONSE));
 
-	if (reply->error() == QNetworkReply::OperationCanceledError)
+	if (m_netReply->error() == QNetworkReply::OperationCanceledError)
 	{
+		// WARNING/FIXME: the value here is used in MojangAccount to detect the cancel/timeout
 		emitFailed("Yggdrasil task cancelled.");
 		return;
 	}
-	else
+
+	// Try to parse the response regardless of the response code.
+	// Sometimes the auth server will give more information and an error code.
+	QJsonParseError jsonError;
+	QByteArray replyData = m_netReply->readAll();
+	QJsonDocument doc = QJsonDocument::fromJson(replyData, &jsonError);
+	// Check the response code.
+	int responseCode = m_netReply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
+
+	if (responseCode == 200)
 	{
-		// Try to parse the response regardless of the response code.
-		// Sometimes the auth server will give more information and an error code.
-		QJsonParseError jsonError;
-		QByteArray replyData = reply->readAll();
-		QJsonDocument doc = QJsonDocument::fromJson(replyData, &jsonError);
-		// Check the response code.
-		int responseCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
-
-		if (responseCode == 200)
+		// If the response code was 200, then there shouldn't be an error. Make sure
+		// anyways.
+		// Also, sometimes an empty reply indicates success. If there was no data received,
+		// pass an empty json object to the processResponse function.
+		if (jsonError.error == QJsonParseError::NoError || replyData.size() == 0)
 		{
-			// If the response code was 200, then there shouldn't be an error. Make sure
-			// anyways.
-			// Also, sometimes an empty reply indicates success. If there was no data received,
-			// pass an empty json object to the processResponse function.
-			if (jsonError.error == QJsonParseError::NoError || replyData.size() == 0)
+			if (processResponse(replyData.size() > 0 ? doc.object() : QJsonObject()))
 			{
-				if (!processResponse(replyData.size() > 0 ? doc.object() : QJsonObject()))
-				{
-					YggdrasilTask::Error *err = getError();
-					if (err)
-						emitFailed(err->getErrorMessage());
-					else
-						emitFailed(tr("An unknown error occurred when processing the response "
-									  "from the authentication server."));
-				}
-				else
-				{
-					emitSucceeded();
-				}
-			}
-			else
-			{
-				emitFailed(tr("Failed to parse Yggdrasil JSON response: %1 at offset %2.")
-							   .arg(jsonError.errorString())
-							   .arg(jsonError.offset));
+				emitSucceeded();
+				return;
 			}
+
+			// errors happened anyway?
+			emitFailed(m_error ? m_error->m_errorMessageVerbose
+							   : tr("An unknown error occurred when processing the response "
+									"from the authentication server."));
 		}
 		else
 		{
-			// If the response code was not 200, then Yggdrasil may have given us information
-			// about the error.
-			// If we can parse the response, then get information from it. Otherwise just say
-			// there was an unknown error.
-			if (jsonError.error == QJsonParseError::NoError)
-			{
-				// We were able to parse the server's response. Woo!
-				// Call processError. If a subclass has overridden it then they'll handle their
-				// stuff there.
-				QLOG_DEBUG() << "The request failed, but the server gave us an error message. "
-								"Processing error.";
-				emitFailed(processError(doc.object()));
-			}
-			else
-			{
-				// The server didn't say anything regarding the error. Give the user an unknown
-				// error.
-				QLOG_DEBUG() << "The request failed and the server gave no error message. "
-								"Unknown error.";
-				emitFailed(tr("An unknown error occurred when trying to communicate with the "
-							  "authentication server: %1").arg(reply->errorString()));
-			}
+			emitFailed(tr("Failed to parse Yggdrasil JSON response: %1 at offset %2.")
+						   .arg(jsonError.errorString())
+						   .arg(jsonError.offset));
 		}
+		return;
+	}
+
+	// If the response code was not 200, then Yggdrasil may have given us information
+	// about the error.
+	// If we can parse the response, then get information from it. Otherwise just say
+	// there was an unknown error.
+	if (jsonError.error == QJsonParseError::NoError)
+	{
+		// We were able to parse the server's response. Woo!
+		// Call processError. If a subclass has overridden it then they'll handle their
+		// stuff there.
+		QLOG_DEBUG() << "The request failed, but the server gave us an error message. "
+						"Processing error.";
+		emitFailed(processError(doc.object()));
+	}
+	else
+	{
+		// The server didn't say anything regarding the error. Give the user an unknown
+		// error.
+		QLOG_DEBUG() << "The request failed and the server gave no error message. "
+						"Unknown error.";
+		emitFailed(tr("An unknown error occurred when trying to communicate with the "
+					  "authentication server: %1").arg(m_netReply->errorString()));
 	}
 }
 
 QString YggdrasilTask::processError(QJsonObject responseData)
 {
 	QJsonValue errorVal = responseData.value("error");
-	QJsonValue msgVal = responseData.value("errorMessage");
+	QJsonValue errorMessageValue = responseData.value("errorMessage");
 	QJsonValue causeVal = responseData.value("cause");
 
-	if (errorVal.isString() && msgVal.isString())
+	if (errorVal.isString() && errorMessageValue.isString())
 	{
-		m_error = new Error(errorVal.toString(""), msgVal.toString(""), causeVal.toString(""));
-		return m_error->getDisplayMessage();
+		m_error = std::shared_ptr<Error>(new Error{
+			errorVal.toString(""), errorMessageValue.toString(""), causeVal.toString("")});
+		return m_error->m_errorMessageVerbose;
 	}
 	else
 	{
@@ -165,8 +176,3 @@ QString YggdrasilTask::getStateMessage(const YggdrasilTask::State state) const
 		return tr("Processing. Please wait.");
 	}
 }
-
-YggdrasilTask::Error *YggdrasilTask::getError() const
-{
-	return this->m_error;
-}
diff --git a/logic/auth/YggdrasilTask.h b/logic/auth/YggdrasilTask.h
index 18d3dc61..1f81a2d0 100644
--- a/logic/auth/YggdrasilTask.h
+++ b/logic/auth/YggdrasilTask.h
@@ -19,6 +19,7 @@
 
 #include <QString>
 #include <QJsonObject>
+#include <QTimer>
 
 #include "logic/auth/MojangAccount.h"
 
@@ -32,39 +33,17 @@ class YggdrasilTask : public Task
 	Q_OBJECT
 public:
 	explicit YggdrasilTask(MojangAccount * account, QObject *parent = 0);
-	~YggdrasilTask();
 
 	/**
 	 * Class describing a Yggdrasil error response.
 	 */
-	class Error
+	struct Error
 	{
-	public:
-		Error(const QString& shortError, const QString& errorMessage, const QString& cause) : 
-			m_shortError(shortError), m_errorMessage(errorMessage), m_cause(cause) {}
-
-		QString getShortError() const { return m_shortError; }
-		QString getErrorMessage() const { return m_errorMessage; }
-		QString getCause() const { return m_cause; }
-
-		/// Gets the string to display in the GUI for describing this error.
-		QString getDisplayMessage()
-		{
-			return getErrorMessage();
-		}
-
-	protected:
-		QString m_shortError;
-		QString m_errorMessage;
+		QString m_errorMessageShort;
+		QString m_errorMessageVerbose;
 		QString m_cause;
 	};
 
-	/**
-	 * Returns a pointer to a YggdrasilTask::Error object if an error has occurred.
-	 * If no error has occurred, returns a null pointer.
-	 */
-	virtual Error *getError() const;
-
 protected:
 	/**
 	 * Enum for describing the state of the current task.
@@ -115,13 +94,25 @@ protected:
 	 */
 	virtual QString getStateMessage(const State state) const;
 
-	MojangAccount *m_account = nullptr;
-
-	QNetworkReply *m_netReply;
-
-	Error *m_error = nullptr;
-
 protected
 slots:
-	void processReply(QNetworkReply *reply);
+	void processReply();
+	void refreshTimers(qint64, qint64);
+	void heartbeat();
+
+public
+slots:
+	virtual void abort() override;
+
+protected:
+	// FIXME: segfault disaster waiting to happen
+	MojangAccount *m_account = nullptr;
+	QNetworkReply *m_netReply = nullptr;
+	std::shared_ptr<Error> m_error;
+	QTimer timeout_keeper;
+	QTimer counter;
+	int count = 0; // num msec since time reset
+
+	const int timeout_max = 10000;
+	const int time_step = 50;
 };
diff --git a/logic/auth/flows/InvalidateTask.cpp b/logic/auth/flows/InvalidateTask.cpp
deleted file mode 100644
index e69de29b..00000000
--- a/logic/auth/flows/InvalidateTask.cpp
+++ /dev/null
diff --git a/logic/auth/flows/InvalidateTask.h b/logic/auth/flows/InvalidateTask.h
deleted file mode 100644
index e69de29b..00000000
--- a/logic/auth/flows/InvalidateTask.h
+++ /dev/null
diff --git a/logic/auth/flows/RefreshTask.cpp b/logic/auth/flows/RefreshTask.cpp
index 39fb493f..bd38eb10 100644
--- a/logic/auth/flows/RefreshTask.cpp
+++ b/logic/auth/flows/RefreshTask.cpp
@@ -143,9 +143,9 @@ QString RefreshTask::getStateMessage(const YggdrasilTask::State state) const
 	switch (state)
 	{
 	case STATE_SENDING_REQUEST:
-		return tr("Refreshing: Sending request.");
+		return tr("Refreshing login token.");
 	case STATE_PROCESSING_RESPONSE:
-		return tr("Refreshing: Processing response.");
+		return tr("Refreshing login token: Processing response.");
 	default:
 		return YggdrasilTask::getStateMessage(state);
 	}
diff --git a/logic/auth/flows/ValidateTask.h b/logic/auth/flows/ValidateTask.h
index 9788f20b..0e34f0c3 100644
--- a/logic/auth/flows/ValidateTask.h
+++ b/logic/auth/flows/ValidateTask.h
@@ -13,6 +13,10 @@
  * limitations under the License.
  */
 
+/*
+ * :FIXME: DEAD CODE, DEAD CODE, DEAD CODE! :FIXME:
+ */
+
 #pragma once
 
 #include <logic/auth/YggdrasilTask.h>