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diff --git a/logic/auth/YggdrasilTask.h b/logic/auth/YggdrasilTask.h
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+/* Copyright 2013 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 <logic/tasks/Task.h>
+
+#include <QString>
+#include <QJsonObject>
+
+#include "logic/auth/MojangAccount.h"
+
+class QNetworkReply;
+
+
+/**
+ * A Yggdrasil task is a task that performs an operation on a given mojang account.
+ */
+class YggdrasilTask : public Task
+{
+Q_OBJECT
+public:
+	explicit YggdrasilTask(MojangAccountPtr account, QObject* parent=0);
+	~YggdrasilTask();
+
+	/**
+	 * Class describing a Yggdrasil error response.
+	 */
+	class 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_cause;
+	};
+
+	/**
+	 * Gets the Mojang account that this task is operating on.
+	 */
+	virtual MojangAccountPtr getMojangAccount() const;
+
+	/**
+	 * 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.
+	 * Used by the getStateMessage function to determine what the status message should be.
+	 */
+	enum State
+	{
+		STATE_SENDING_REQUEST,
+		STATE_PROCESSING_RESPONSE,
+		STATE_OTHER,
+	};
+
+	virtual void executeTask();
+
+	/**
+	 * Gets the JSON object that will be sent to the authentication server.
+	 * Should be overridden by subclasses.
+	 */
+	virtual QJsonObject getRequestContent() const = 0;
+
+	/**
+	 * Gets the endpoint to POST to.
+	 * No leading slash.
+	 */
+	virtual QString getEndpoint() const = 0;
+
+	/**
+	 * Processes the response received from the server.
+	 * If an error occurred, this should emit a failed signal and return false.
+	 * If Yggdrasil gave an error response, it should call setError() first, and then return false.
+	 * Otherwise, it should return true.
+	 */
+	virtual bool processResponse(QJsonObject responseData) = 0;
+
+	/**
+	 * Processes an error response received from the server.
+	 * The default implementation will read data from Yggdrasil's standard error response format and set it as this task's Error.
+	 * \returns a QString error message that will be passed to emitFailed.
+	 */
+	virtual QString processError(QJsonObject responseData);
+
+	/**
+	 * Returns the state message for the given state.
+	 * Used to set the status message for the task.
+	 * Should be overridden by subclasses that want to change messages for a given state.
+	 */
+	virtual QString getStateMessage(const State state) const;
+
+	MojangAccountPtr m_account;
+
+	QNetworkReply* m_netReply;
+
+	Error* m_error;
+
+protected slots:
+	void processReply(QNetworkReply* reply);
+};
+