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diff --git a/libraries/logic/minecraft/auth/MojangAccount.h b/libraries/logic/minecraft/auth/MojangAccount.h
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+++ b/libraries/logic/minecraft/auth/MojangAccount.h
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+/* Copyright 2013-2015 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QObject>
+#include <QString>
+#include <QList>
+#include <QJsonObject>
+#include <QPair>
+#include <QMap>
+
+#include <memory>
+#include "AuthSession.h"
+
+#include "multimc_logic_export.h"
+
+class Task;
+class YggdrasilTask;
+class MojangAccount;
+
+typedef std::shared_ptr<MojangAccount> MojangAccountPtr;
+Q_DECLARE_METATYPE(MojangAccountPtr)
+
+/**
+ * A profile within someone's Mojang account.
+ *
+ * Currently, the profile system has not been implemented by Mojang yet,
+ * but we might as well add some things for it in MultiMC right now so
+ * we don't have to rip the code to pieces to add it later.
+ */
+struct AccountProfile
+{
+	QString id;
+	QString name;
+	bool legacy;
+};
+
+enum AccountStatus
+{
+	NotVerified,
+	Verified
+};
+
+/**
+ * Object that stores information about a certain Mojang account.
+ *
+ * Said information may include things such as that account's username, client token, and access
+ * token if the user chose to stay logged in.
+ */
+class MULTIMC_LOGIC_EXPORT MojangAccount : public QObject
+{
+	Q_OBJECT
+public: /* construction */
+	//! Do not copy accounts. ever.
+	explicit MojangAccount(const MojangAccount &other, QObject *parent) = delete;
+
+	//! Default constructor
+	explicit MojangAccount(QObject *parent = 0) : QObject(parent) {};
+
+	//! Creates an empty account for the specified user name.
+	static MojangAccountPtr createFromUsername(const QString &username);
+
+	//! Loads a MojangAccount from the given JSON object.
+	static MojangAccountPtr loadFromJson(const QJsonObject &json);
+
+	//! Saves a MojangAccount to a JSON object and returns it.
+	QJsonObject saveToJson() const;
+
+public: /* manipulation */
+		/**
+	 * Sets the currently selected profile to the profile with the given ID string.
+	 * If profileId is not in the list of available profiles, the function will simply return
+	 * false.
+	 */
+	bool setCurrentProfile(const QString &profileId);
+
+	/**
+	 * Attempt to login. Empty password means we use the token.
+	 * If the attempt fails because we already are performing some task, it returns false.
+	 */
+	std::shared_ptr<YggdrasilTask> login(AuthSessionPtr session,
+										 QString password = QString());
+
+public: /* queries */
+	const QString &username() const
+	{
+		return m_username;
+	}
+
+	const QString &clientToken() const
+	{
+		return m_clientToken;
+	}
+
+	const QString &accessToken() const
+	{
+		return m_accessToken;
+	}
+
+	const QList<AccountProfile> &profiles() const
+	{
+		return m_profiles;
+	}
+
+	const User &user()
+	{
+		return m_user;
+	}
+
+	//! Returns the currently selected profile (if none, returns nullptr)
+	const AccountProfile *currentProfile() const;
+
+	//! Returns whether the account is NotVerified, Verified or Online
+	AccountStatus accountStatus() const;
+
+signals:
+	/**
+	 * This signal is emitted when the account changes
+	 */
+	void changed();
+
+	// TODO: better signalling for the various possible state changes - especially errors
+
+protected: /* variables */
+	QString m_username;
+
+	// Used to identify the client - the user can have multiple clients for the same account
+	// Think: different launchers, all connecting to the same account/profile
+	QString m_clientToken;
+
+	// Blank if not logged in.
+	QString m_accessToken;
+
+	// Index of the selected profile within the list of available
+	// profiles. -1 if nothing is selected.
+	int m_currentProfile = -1;
+
+	// List of available profiles.
+	QList<AccountProfile> m_profiles;
+
+	// the user structure, whatever it is.
+	User m_user;
+
+	// current task we are executing here
+	std::shared_ptr<YggdrasilTask> m_currentTask;
+
+private
+slots:
+	void authSucceeded();
+	void authFailed(QString reason);
+
+private:
+	void fillSession(AuthSessionPtr session);
+
+public:
+	friend class YggdrasilTask;
+	friend class AuthenticateTask;
+	friend class ValidateTask;
+	friend class RefreshTask;
+};