GH-3392 dirty initial MSA support that shares logic with Mojang flows

Both act as the first step of AuthContext.

launcher/minecraft/auth/AccountTask.h

@@ -0,0 +1,103 @@
+/* Copyright 2013-2021 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 <tasks/Task.h>
+
+#include <QString>
+#include <QJsonObject>
+#include <QTimer>
+#include <qsslerror.h>
+
+#include "MinecraftAccount.h"
+
+class QNetworkReply;
+
+class AccountTask : public Task
+{
+    friend class AuthContext;
+    Q_OBJECT
+public:
+    explicit AccountTask(AccountData * data, QObject *parent = 0);
+    virtual ~AccountTask() {};
+
+    /**
+     * assign a session to this task. the session will be filled with required infomration
+     * upon completion
+     */
+    void assignSession(AuthSessionPtr session)
+    {
+        m_session = session;
+    }
+
+    /// get the assigned session for filling with information.
+    AuthSessionPtr getAssignedSession()
+    {
+        return m_session;
+    }
+
+    /**
+     * Class describing a Account error response.
+     */
+    struct Error
+    {
+        QString m_errorMessageShort;
+        QString m_errorMessageVerbose;
+        QString m_cause;
+    };
+
+    enum AbortedBy
+    {
+        BY_NOTHING,
+        BY_USER,
+        BY_TIMEOUT
+    } m_aborted = BY_NOTHING;
+
+    /**
+     * 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_CREATED,
+        STATE_WORKING,
+        STATE_FAILED_SOFT, //!< soft failure. this generally means the user auth details haven't been invalidated
+        STATE_FAILED_HARD, //!< hard failure. auth is invalid
+        STATE_SUCCEEDED
+    } m_accountState = STATE_CREATED;
+
+    State accountState() {
+        return m_accountState;
+    }
+
+protected:
+
+    /**
+     * 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;
+
+protected slots:
+    void changeState(State newState, QString reason=QString());
+
+protected:
+    // FIXME: segfault disaster waiting to happen
+    AccountData *m_data = nullptr;
+    std::shared_ptr<Error> m_error;
+    AuthSessionPtr m_session;
+};