refactor: organize a little more the code in launcher/net/

This also reduces some code duplication by using some Task logic in
NetAction.

11 files changed, 403 insertions, 433 deletions

diff --git a/launcher/net/ByteArraySink.h b/launcher/net/ByteArraySink.h
index 20e6764c..75a66574 100644
--- a/launcher/net/ByteArraySink.h
+++ b/launcher/net/ByteArraySink.h
@@ -3,60 +3,59 @@
 #include "Sink.h"
 
 namespace Net {
+
 /*
  * Sink object for downloads that uses an external QByteArray it doesn't own as a target.
  */
-class ByteArraySink : public Sink
-{
-public:
-    ByteArraySink(QByteArray *output)
-        :m_output(output)
-    {
-        // nil
-    };
+class ByteArraySink : public Sink {
+   public:
+    ByteArraySink(QByteArray* output) : m_output(output){};
 
-    virtual ~ByteArraySink()
-    {
-        // nil
-    }
+    virtual ~ByteArraySink() = default;
 
-public:
-    JobStatus init(QNetworkRequest & request) override
+   public:
+    auto init(QNetworkRequest& request) -> Task::State override
     {
+        if(!m_output)
+            return Task::State::Failed;
+
         m_output->clear();
-        if(initAllValidators(request))
-            return Job_InProgress;
-        return Job_Failed;
+        if (initAllValidators(request))
+            return Task::State::Running;
+        return Task::State::Failed;
     };
 
-    JobStatus write(QByteArray & data) override
+    auto write(QByteArray& data) -> Task::State override
     {
+        if(!m_output)
+            return Task::State::Failed;
+
         m_output->append(data);
-        if(writeAllValidators(data))
-            return Job_InProgress;
-        return Job_Failed;
+        if (writeAllValidators(data))
+            return Task::State::Running;
+        return Task::State::Failed;
     }
 
-    JobStatus abort() override
+    auto abort() -> Task::State override
     {
+        if(!m_output)
+            return Task::State::Failed;
+
         m_output->clear();
         failAllValidators();
-        return Job_Failed;
+        return Task::State::Failed;
     }
 
-    JobStatus finalize(QNetworkReply &reply) override
+    auto finalize(QNetworkReply& reply) -> Task::State override
     {
-        if(finalizeAllValidators(reply))
-            return Job_Finished;
-        return Job_Failed;
+        if (finalizeAllValidators(reply))
+            return Task::State::Succeeded;
+        return Task::State::Failed;
     }
 
-    bool hasLocalData() override
-    {
-        return false;
-    }
+    auto hasLocalData() -> bool override { return false; }
 
-private:
-    QByteArray * m_output;
+   private:
+    QByteArray* m_output;
 };
-}
+}  // namespace Net
diff --git a/launcher/net/Download.cpp b/launcher/net/Download.cpp
index 65cc8f67..5b5a04db 100644
--- a/launcher/net/Download.cpp
+++ b/launcher/net/Download.cpp
@@ -30,7 +30,7 @@ namespace Net {
 
 Download::Download() : NetAction()
 {
-    m_status = Job_NotStarted;
+    m_state = State::Inactive;
 }
 
 Download::Ptr Download::makeCached(QUrl url, MetaEntryPtr entry, Options options)
@@ -68,29 +68,29 @@ void Download::addValidator(Validator* v)
     m_sink->addValidator(v);
 }
 
-void Download::startImpl()
+void Download::executeTask()
 {
-    if (m_status == Job_Aborted) {
+    if (getState() == Task::State::AbortedByUser) {
         qWarning() << "Attempt to start an aborted Download:" << m_url.toString();
         emit aborted(m_index_within_job);
         return;
     }
+
     QNetworkRequest request(m_url);
-    m_status = m_sink->init(request);
-    switch (m_status) {
-        case Job_Finished:
+    m_state = m_sink->init(request);
+    switch (m_state) {
+        case State::Succeeded:
             emit succeeded(m_index_within_job);
             qDebug() << "Download cache hit " << m_url.toString();
             return;
-        case Job_InProgress:
+        case State::Running:
             qDebug() << "Downloading " << m_url.toString();
             break;
-        case Job_Failed_Proceed:  // this is meaningless in this context. We do need a sink.
-        case Job_NotStarted:
-        case Job_Failed:
+        case State::Inactive:
+        case State::Failed:
             emit failed(m_index_within_job);
             return;
-        case Job_Aborted:
+        case State::AbortedByUser:
             return;
     }
 
@@ -111,8 +111,7 @@ void Download::startImpl()
 
 void Download::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
 {
-    m_total_progress = bytesTotal;
-    m_progress = bytesReceived;
+    setProgress(bytesReceived, bytesTotal);
     emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
 }
 
@@ -120,17 +119,17 @@ void Download::downloadError(QNetworkReply::NetworkError error)
 {
     if (error == QNetworkReply::OperationCanceledError) {
         qCritical() << "Aborted " << m_url.toString();
-        m_status = Job_Aborted;
+        m_state = State::AbortedByUser;
     } else {
         if (m_options & Option::AcceptLocalFiles) {
             if (m_sink->hasLocalData()) {
-                m_status = Job_Failed_Proceed;
+                m_state = State::Succeeded;
                 return;
             }
         }
         // error happened during download.
         qCritical() << "Failed " << m_url.toString() << " with reason " << error;
-        m_status = Job_Failed;
+        m_state = State::Failed;
     }
 }
 
@@ -194,7 +193,8 @@ bool Download::handleRedirect()
 
     m_url = QUrl(redirect.toString());
     qDebug() << "Following redirect to " << m_url.toString();
-    start(m_network);
+    startAction(m_network);
+
     return true;
 }
 
@@ -207,19 +207,20 @@ void Download::downloadFinished()
     }
 
     // if the download failed before this point ...
-    if (m_status == Job_Failed_Proceed) {
+    if (m_state == State::Succeeded)  // pretend to succeed so we continue processing :)
+    {
         qDebug() << "Download failed but we are allowed to proceed:" << m_url.toString();
         m_sink->abort();
         m_reply.reset();
         emit succeeded(m_index_within_job);
         return;
-    } else if (m_status == Job_Failed) {
+    } else if (m_state == State::Failed) {
         qDebug() << "Download failed in previous step:" << m_url.toString();
         m_sink->abort();
         m_reply.reset();
         emit failed(m_index_within_job);
         return;
-    } else if (m_status == Job_Aborted) {
+    } else if (m_state == State::AbortedByUser) {
         qDebug() << "Download aborted in previous step:" << m_url.toString();
         m_sink->abort();
         m_reply.reset();
@@ -231,12 +232,12 @@ void Download::downloadFinished()
     auto data = m_reply->readAll();
     if (data.size()) {
         qDebug() << "Writing extra" << data.size() << "bytes to" << m_target_path;
-        m_status = m_sink->write(data);
+        m_state = m_sink->write(data);
     }
 
     // otherwise, finalize the whole graph
-    m_status = m_sink->finalize(*m_reply.get());
-    if (m_status != Job_Finished) {
+    m_state = m_sink->finalize(*m_reply.get());
+    if (m_state != State::Succeeded) {
         qDebug() << "Download failed to finalize:" << m_url.toString();
         m_sink->abort();
         m_reply.reset();
@@ -250,10 +251,10 @@ void Download::downloadFinished()
 
 void Download::downloadReadyRead()
 {
-    if (m_status == Job_InProgress) {
+    if (m_state == State::Running) {
         auto data = m_reply->readAll();
-        m_status = m_sink->write(data);
-        if (m_status == Job_Failed) {
+        m_state = m_sink->write(data);
+        if (m_state == State::Failed) {
             qCritical() << "Failed to process response chunk for " << m_target_path;
         }
         // qDebug() << "Download" << m_url.toString() << "gained" << data.size() << "bytes";
@@ -269,12 +270,7 @@ bool Net::Download::abort()
     if (m_reply) {
         m_reply->abort();
     } else {
-        m_status = Job_Aborted;
+        m_state = State::AbortedByUser;
     }
     return true;
 }
-
-bool Net::Download::canAbort()
-{
-    return true;
-}
diff --git a/launcher/net/Download.h b/launcher/net/Download.h
index 0f9bfe7f..231ad6a7 100644
--- a/launcher/net/Download.h
+++ b/launcher/net/Download.h
@@ -27,7 +27,7 @@ class Download : public NetAction
 {
     Q_OBJECT
 
-public: /* types */
+public:
     typedef shared_qobject_ptr<class Download> Ptr;
     enum class Option
     {
@@ -36,7 +36,7 @@ public: /* types */
     };
     Q_DECLARE_FLAGS(Options, Option)
 
-protected: /* con/des */
+protected:
     explicit Download();
 public:
     virtual ~Download(){};
@@ -44,16 +44,16 @@ public:
     static Download::Ptr makeByteArray(QUrl url, QByteArray *output, Options options = Option::NoOptions);
     static Download::Ptr makeFile(QUrl url, QString path, Options options = Option::NoOptions);
 
-public: /* methods */
+public:
     QString getTargetFilepath()
     {
         return m_target_path;
     }
     void addValidator(Validator * v);
     bool abort() override;
-    bool canAbort() override;
+    bool canAbort() const override { return true; };
 
-private: /* methods */
+private:
     bool handleRedirect();
 
 protected slots:
@@ -64,9 +64,9 @@ protected slots:
     void downloadReadyRead() override;
 
 public slots:
-    void startImpl() override;
+    void executeTask() override;
 
-private: /* data */
+private:
     // FIXME: remove this, it has no business being here.
     QString m_target_path;
     std::unique_ptr<Sink> m_sink;
diff --git a/launcher/net/FileSink.cpp b/launcher/net/FileSink.cpp
index 7e9b8929..0d8b09bb 100644
--- a/launcher/net/FileSink.cpp
+++ b/launcher/net/FileSink.cpp
@@ -1,25 +1,15 @@
 #include "FileSink.h"
+
 #include <QFile>
-#include <QFileInfo>
+
 #include "FileSystem.h"
 
 namespace Net {
 
-FileSink::FileSink(QString filename)
-    :m_filename(filename)
-{
-    // nil
-}
-
-FileSink::~FileSink()
-{
-    // nil
-}
-
-JobStatus FileSink::init(QNetworkRequest& request)
+Task::State FileSink::init(QNetworkRequest& request)
 {
     auto result = initCache(request);
-    if(result != Job_InProgress)
+    if(result != Task::State::Running)
     {
         return result;
     }
@@ -27,27 +17,27 @@ JobStatus FileSink::init(QNetworkRequest& request)
     if (!FS::ensureFilePathExists(m_filename))
     {
         qCritical() << "Could not create folder for " + m_filename;
-        return Job_Failed;
+        return Task::State::Failed;
     }
     wroteAnyData = false;
     m_output_file.reset(new QSaveFile(m_filename));
     if (!m_output_file->open(QIODevice::WriteOnly))
     {
         qCritical() << "Could not open " + m_filename + " for writing";
-        return Job_Failed;
+        return Task::State::Failed;
     }
 
     if(initAllValidators(request))
-        return Job_InProgress;
-    return Job_Failed;
+        return Task::State::Running;
+    return Task::State::Failed;
 }
 
-JobStatus FileSink::initCache(QNetworkRequest &)
+Task::State FileSink::initCache(QNetworkRequest &)
 {
-    return Job_InProgress;
+    return Task::State::Running;
 }
 
-JobStatus FileSink::write(QByteArray& data)
+Task::State FileSink::write(QByteArray& data)
 {
     if (!writeAllValidators(data) || m_output_file->write(data) != data.size())
     {
@@ -55,20 +45,20 @@ JobStatus FileSink::write(QByteArray& data)
         m_output_file->cancelWriting();
         m_output_file.reset();
         wroteAnyData = false;
-        return Job_Failed;
+        return Task::State::Failed;
     }
     wroteAnyData = true;
-    return Job_InProgress;
+    return Task::State::Running;
 }
 
-JobStatus FileSink::abort()
+Task::State FileSink::abort()
 {
     m_output_file->cancelWriting();
     failAllValidators();
-    return Job_Failed;
+    return Task::State::Failed;
 }
 
-JobStatus FileSink::finalize(QNetworkReply& reply)
+Task::State FileSink::finalize(QNetworkReply& reply)
 {
     bool gotFile = false;
     QVariant statusCodeV = reply.attribute(QNetworkRequest::HttpStatusCodeAttribute);
@@ -86,13 +76,13 @@ JobStatus FileSink::finalize(QNetworkReply& reply)
         // ask validators for data consistency
         // we only do this for actual downloads, not 'your data is still the same' cache hits
         if(!finalizeAllValidators(reply))
-            return Job_Failed;
+            return Task::State::Failed;
         // nothing went wrong...
         if (!m_output_file->commit())
         {
             qCritical() << "Failed to commit changes to " << m_filename;
             m_output_file->cancelWriting();
-            return Job_Failed;
+            return Task::State::Failed;
         }
     }
     // then get rid of the save file
@@ -101,9 +91,9 @@ JobStatus FileSink::finalize(QNetworkReply& reply)
     return finalizeCache(reply);
 }
 
-JobStatus FileSink::finalizeCache(QNetworkReply &)
+Task::State FileSink::finalizeCache(QNetworkReply &)
 {
-    return Job_Finished;
+    return Task::State::Succeeded;
 }
 
 bool FileSink::hasLocalData()
diff --git a/launcher/net/FileSink.h b/launcher/net/FileSink.h
index 875fe511..9d77b3d0 100644
--- a/launcher/net/FileSink.h
+++ b/launcher/net/FileSink.h
@@ -1,28 +1,30 @@
 #pragma once
-#include "Sink.h"
+
 #include <QSaveFile>
 
+#include "Sink.h"
+
 namespace Net {
-class FileSink : public Sink
-{
-public: /* con/des */
-    FileSink(QString filename);
-    virtual ~FileSink();
+class FileSink : public Sink {
+   public:
+    FileSink(QString filename) : m_filename(filename){};
+    virtual ~FileSink() = default;
+
+   public:
+    auto init(QNetworkRequest& request) -> Task::State override;
+    auto write(QByteArray& data) -> Task::State override;
+    auto abort() -> Task::State override;
+    auto finalize(QNetworkReply& reply) -> Task::State override;
 
-public: /* methods */
-    JobStatus init(QNetworkRequest & request) override;
-    JobStatus write(QByteArray & data) override;
-    JobStatus abort() override;
-    JobStatus finalize(QNetworkReply & reply) override;
-    bool hasLocalData() override;
+    auto hasLocalData() -> bool override;
 
-protected: /* methods */
-    virtual JobStatus initCache(QNetworkRequest &);
-    virtual JobStatus finalizeCache(QNetworkReply &reply);
+   protected:
+    virtual auto initCache(QNetworkRequest&) -> Task::State;
+    virtual auto finalizeCache(QNetworkReply& reply) -> Task::State;
 
-protected: /* data */
+   protected:
     QString m_filename;
     bool wroteAnyData = false;
     std::unique_ptr<QSaveFile> m_output_file;
 };
-}
+}  // namespace Net
diff --git a/launcher/net/MetaCacheSink.cpp b/launcher/net/MetaCacheSink.cpp
index 5cdf0460..34ba9f56 100644
--- a/launcher/net/MetaCacheSink.cpp
+++ b/launcher/net/MetaCacheSink.cpp
@@ -12,17 +12,13 @@ MetaCacheSink::MetaCacheSink(MetaEntryPtr entry, ChecksumValidator * md5sum)
     addValidator(md5sum);
 }
 
-MetaCacheSink::~MetaCacheSink()
-{
-    // nil
-}
-
-JobStatus MetaCacheSink::initCache(QNetworkRequest& request)
+Task::State MetaCacheSink::initCache(QNetworkRequest& request)
 {
     if (!m_entry->isStale())
     {
-        return Job_Finished;
+        return Task::State::Succeeded;
     }
+
     // check if file exists, if it does, use its information for the request
     QFile current(m_filename);
     if(current.exists() && current.size() != 0)
@@ -36,25 +32,31 @@ JobStatus MetaCacheSink::initCache(QNetworkRequest& request)
             request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->getETag().toLatin1());
         }
     }
-    return Job_InProgress;
+
+    return Task::State::Running;
 }
 
-JobStatus MetaCacheSink::finalizeCache(QNetworkReply & reply)
+Task::State MetaCacheSink::finalizeCache(QNetworkReply & reply)
 {
     QFileInfo output_file_info(m_filename);
+
     if(wroteAnyData)
     {
         m_entry->setMD5Sum(m_md5Node->hash().toHex().constData());
     }
+
     m_entry->setETag(reply.rawHeader("ETag").constData());
+
     if (reply.hasRawHeader("Last-Modified"))
     {
         m_entry->setRemoteChangedTimestamp(reply.rawHeader("Last-Modified").constData());
     }
+
     m_entry->setLocalChangedTimestamp(output_file_info.lastModified().toUTC().toMSecsSinceEpoch());
     m_entry->setStale(false);
     APPLICATION->metacache()->updateEntry(m_entry);
-    return Job_Finished;
+
+    return Task::State::Succeeded;
 }
 
 bool MetaCacheSink::hasLocalData()
diff --git a/launcher/net/MetaCacheSink.h b/launcher/net/MetaCacheSink.h
index edcf7ad1..431e10a8 100644
--- a/launcher/net/MetaCacheSink.h
+++ b/launcher/net/MetaCacheSink.h
@@ -1,22 +1,23 @@
 #pragma once
-#include "FileSink.h"
+
 #include "ChecksumValidator.h"
+#include "FileSink.h"
 #include "net/HttpMetaCache.h"
 
 namespace Net {
-class MetaCacheSink : public FileSink
-{
-public: /* con/des */
-    MetaCacheSink(MetaEntryPtr entry, ChecksumValidator * md5sum);
-    virtual ~MetaCacheSink();
-    bool hasLocalData() override;
+class MetaCacheSink : public FileSink {
+   public:
+    MetaCacheSink(MetaEntryPtr entry, ChecksumValidator* md5sum);
+    virtual ~MetaCacheSink() = default;
+
+    auto hasLocalData() -> bool override;
 
-protected: /* methods */
-    JobStatus initCache(QNetworkRequest & request) override;
-    JobStatus finalizeCache(QNetworkReply & reply) override;
+   protected:
+    auto initCache(QNetworkRequest& request) -> Task::State override;
+    auto finalizeCache(QNetworkReply& reply) -> Task::State override;
 
-private: /* data */
+   private:
     MetaEntryPtr m_entry;
-    ChecksumValidator * m_md5Node;
+    ChecksumValidator* m_md5Node;
 };
-}
+}  // namespace Net
diff --git a/launcher/net/NetAction.h b/launcher/net/NetAction.h
index efb20953..e15716f6 100644
--- a/launcher/net/NetAction.h
+++ b/launcher/net/NetAction.h
@@ -1,108 +1,81 @@
-/* Copyright 2013-2021 MultiMC Contributors
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
  *
- * 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
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *  This program 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 General Public License for more details.
  *
- * 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.
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ *      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 <QObject>
-#include <QUrl>
-#include <memory>
 #include <QNetworkReply>
-#include <QObjectPtr.h>
+#include <QUrl>
 
-enum JobStatus
-{
-    Job_NotStarted,
-    Job_InProgress,
-    Job_Finished,
-    Job_Failed,
-    Job_Aborted,
-    /*
-     * FIXME: @NUKE this confuses the task failing with us having a fallback in the form of local data. Clear up the confusion.
-     * Same could be true for aborted task - the presence of pre-existing result is a separate concern
-     */
-    Job_Failed_Proceed
-};
+#include "QObjectPtr.h"
+#include "tasks/Task.h"
 
-class NetAction : public QObject
-{
+class NetAction : public Task {
     Q_OBJECT
-protected:
-    explicit NetAction() : QObject(nullptr) {};
+   protected:
+    explicit NetAction() : Task(nullptr) {};
 
-public:
+   public:
     using Ptr = shared_qobject_ptr<NetAction>;
 
-    virtual ~NetAction() {};
-
-    bool isRunning() const
-    {
-        return m_status == Job_InProgress;
-    }
-    bool isFinished() const
-    {
-        return m_status >= Job_Finished;
-    }
-    bool wasSuccessful() const
-    {
-        return m_status == Job_Finished || m_status == Job_Failed_Proceed;
-    }
+    virtual ~NetAction() = default;
 
-    qint64 totalProgress() const
-    {
-        return m_total_progress;
-    }
-    qint64 currentProgress() const
-    {
-        return m_progress;
-    }
-    virtual bool abort()
-    {
-        return false;
-    }
-    virtual bool canAbort()
-    {
-        return false;
-    }
-    QUrl url()
-    {
-        return m_url;
-    }
+    QUrl url() { return m_url; }
 
-signals:
+   signals:
     void started(int index);
     void netActionProgress(int index, qint64 current, qint64 total);
     void succeeded(int index);
     void failed(int index);
     void aborted(int index);
 
-protected slots:
+   protected slots:
     virtual void downloadProgress(qint64 bytesReceived, qint64 bytesTotal) = 0;
     virtual void downloadError(QNetworkReply::NetworkError error) = 0;
     virtual void downloadFinished() = 0;
     virtual void downloadReadyRead() = 0;
 
-public slots:
-    void start(shared_qobject_ptr<QNetworkAccessManager> network) {
+   public slots:
+    void startAction(shared_qobject_ptr<QNetworkAccessManager> network)
+    {
         m_network = network;
-        startImpl();
+        executeTask();
     }
 
-protected:
-    virtual void startImpl() = 0;
+   protected:
+    void executeTask() override {};
 
-public:
+   public:
     shared_qobject_ptr<QNetworkAccessManager> m_network;
 
     /// index within the parent job, FIXME: nuke
@@ -113,10 +86,4 @@ public:
 
     /// source URL
     QUrl m_url;
-
-    qint64 m_progress = 0;
-    qint64 m_total_progress = 1;
-
-protected:
-    JobStatus m_status = Job_NotStarted;
 };
diff --git a/launcher/net/NetJob.cpp b/launcher/net/NetJob.cpp
index 9bad89ed..d08d6c4d 100644
--- a/launcher/net/NetJob.cpp
+++ b/launcher/net/NetJob.cpp
@@ -1,79 +1,170 @@
-/* Copyright 2013-2021 MultiMC Contributors
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
  *
- * 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
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *  This program 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 General Public License for more details.
  *
- * 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.
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ *      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.
  */
 
 #include "NetJob.h"
 #include "Download.h"
 
-#include <QDebug>
+auto NetJob::addNetAction(NetAction::Ptr action) -> bool
+{
+    action->m_index_within_job = m_downloads.size();
+    m_downloads.append(action);
+    part_info pi;
+    m_parts_progress.append(pi);
+
+    partProgress(m_parts_progress.count() - 1, action->getProgress(), action->getTotalProgress());
+
+    if (action->isRunning()) {
+        connect(action.get(), &NetAction::succeeded, this, &NetJob::partSucceeded);
+        connect(action.get(), &NetAction::failed, this, &NetJob::partFailed);
+        connect(action.get(), &NetAction::netActionProgress, this, &NetJob::partProgress);
+    } else {
+        m_todo.append(m_parts_progress.size() - 1);
+    }
+
+    return true;
+}
+
+auto NetJob::canAbort() const -> bool
+{
+    bool canFullyAbort = true;
+
+    // can abort the downloads on the queue?
+    for (auto index : m_todo) {
+        auto part = m_downloads[index];
+        canFullyAbort &= part->canAbort();
+    }
+    // can abort the active downloads?
+    for (auto index : m_doing) {
+        auto part = m_downloads[index];
+        canFullyAbort &= part->canAbort();
+    }
+
+    return canFullyAbort;
+}
+
+void NetJob::executeTask()
+{
+    // hack that delays early failures so they can be caught easier
+    QMetaObject::invokeMethod(this, "startMoreParts", Qt::QueuedConnection);
+}
+
+auto NetJob::getFailedFiles() -> QStringList
+{
+    QStringList failed;
+    for (auto index : m_failed) {
+        failed.push_back(m_downloads[index]->url().toString());
+    }
+    failed.sort();
+    return failed;
+}
+
+auto NetJob::abort() -> bool
+{
+    bool fullyAborted = true;
+
+    // fail all downloads on the queue
+    m_failed.unite(m_todo.toSet());
+    m_todo.clear();
+
+    // abort active downloads
+    auto toKill = m_doing.toList();
+    for (auto index : toKill) {
+        auto part = m_downloads[index];
+        fullyAborted &= part->abort();
+    }
+
+    return fullyAborted;
+}
 
 void NetJob::partSucceeded(int index)
 {
     // do progress. all slots are 1 in size at least
-    auto &slot = parts_progress[index];
+    auto& slot = m_parts_progress[index];
     partProgress(index, slot.total_progress, slot.total_progress);
 
     m_doing.remove(index);
     m_done.insert(index);
-    downloads[index].get()->disconnect(this);
+    m_downloads[index].get()->disconnect(this);
+
     startMoreParts();
 }
 
 void NetJob::partFailed(int index)
 {
     m_doing.remove(index);
-    auto &slot = parts_progress[index];
-    if (slot.failures == 3)
-    {
+
+    auto& slot = m_parts_progress[index];
+    // Can try 3 times before failing by definitive
+    if (slot.failures == 3) {
         m_failed.insert(index);
-    }
-    else
-    {
+    } else {
         slot.failures++;
         m_todo.enqueue(index);
     }
-    downloads[index].get()->disconnect(this);
+
+    m_downloads[index].get()->disconnect(this);
+
     startMoreParts();
 }
 
 void NetJob::partAborted(int index)
 {
     m_aborted = true;
+
     m_doing.remove(index);
     m_failed.insert(index);
-    downloads[index].get()->disconnect(this);
+    m_downloads[index].get()->disconnect(this);
+
     startMoreParts();
 }
 
 void NetJob::partProgress(int index, qint64 bytesReceived, qint64 bytesTotal)
 {
-    auto &slot = parts_progress[index];
+    auto& slot = m_parts_progress[index];
     slot.current_progress = bytesReceived;
     slot.total_progress = bytesTotal;
 
     int done = m_done.size();
     int doing = m_doing.size();
-    int all = parts_progress.size();
+    int all = m_parts_progress.size();
 
     qint64 bytesAll = 0;
     qint64 bytesTotalAll = 0;
-    for(auto & partIdx: m_doing)
-    {
-        auto part = parts_progress[partIdx];
+    for (auto& partIdx : m_doing) {
+        auto part = m_parts_progress[partIdx];
         // do not count parts with unknown/nonsensical total size
-        if(part.total_progress <= 0)
-        {
+        if (part.total_progress <= 0) {
             continue;
         }
         bytesAll += part.current_progress;
@@ -85,134 +176,53 @@ void NetJob::partProgress(int index, qint64 bytesReceived, qint64 bytesTotal)
     auto current_total = all * 1000;
     // HACK: make sure it never jumps backwards.
     // FAIL: This breaks if the size is not known (or is it something else?) and jumps to 1000, so if it is 1000 reset it to inprogress
-    if(m_current_progress == 1000) {
+    if (m_current_progress == 1000) {
         m_current_progress = inprogress;
     }
-    if(m_current_progress > current)
-    {
+    if (m_current_progress > current) {
         current = m_current_progress;
     }
     m_current_progress = current;
     setProgress(current, current_total);
 }
 
-void NetJob::executeTask()
-{
-    // hack that delays early failures so they can be caught easier
-    QMetaObject::invokeMethod(this, "startMoreParts", Qt::QueuedConnection);
-}
-
 void NetJob::startMoreParts()
 {
-    if(!isRunning())
-    {
-        // this actually makes sense. You can put running downloads into a NetJob and then not start it until much later.
+    if (!isRunning()) {
+        // this actually makes sense. You can put running m_downloads into a NetJob and then not start it until much later.
         return;
     }
+
     // OK. We are actively processing tasks, proceed.
     // Check for final conditions if there's nothing in the queue.
-    if(!m_todo.size())
-    {
-        if(!m_doing.size())
-        {
-            if(!m_failed.size())
-            {
+    if (!m_todo.size()) {
+        if (!m_doing.size()) {
+            if (!m_failed.size()) {
                 emitSucceeded();
-            }
-            else if(m_aborted)
-            {
+            } else if (m_aborted) {
                 emitAborted();
-            }
-            else
-            {
+            } else {
                 emitFailed(tr("Job '%1' failed to process:\n%2").arg(objectName()).arg(getFailedFiles().join("\n")));
             }
         }
         return;
     }
-    // There's work to do, try to start more parts.
-    while (m_doing.size() < 6)
-    {
-        if(!m_todo.size())
+
+    // There's work to do, try to start more parts, to a maximum of 6 concurrent ones.
+    while (m_doing.size() < 6) {
+        if (m_todo.size() == 0)
             return;
         int doThis = m_todo.dequeue();
         m_doing.insert(doThis);
-        auto part = downloads[doThis];
-        // connect signals :D
-        connect(part.get(), SIGNAL(succeeded(int)), SLOT(partSucceeded(int)));
-        connect(part.get(), SIGNAL(failed(int)), SLOT(partFailed(int)));
-        connect(part.get(), SIGNAL(aborted(int)), SLOT(partAborted(int)));
-        connect(part.get(), SIGNAL(netActionProgress(int, qint64, qint64)),
-                SLOT(partProgress(int, qint64, qint64)));
-        part->start(m_network);
-    }
-}
-
-
-QStringList NetJob::getFailedFiles()
-{
-    QStringList failed;
-    for (auto index: m_failed)
-    {
-        failed.push_back(downloads[index]->url().toString());
-    }
-    failed.sort();
-    return failed;
-}
 
-bool NetJob::canAbort() const
-{
-    bool canFullyAbort = true;
-    // can abort the waiting?
-    for(auto index: m_todo)
-    {
-        auto part = downloads[index];
-        canFullyAbort &= part->canAbort();
-    }
-    // can abort the active?
-    for(auto index: m_doing)
-    {
-        auto part = downloads[index];
-        canFullyAbort &= part->canAbort();
-    }
-    return canFullyAbort;
-}
+        auto part = m_downloads[doThis];
 
-bool NetJob::abort()
-{
-    bool fullyAborted = true;
-    // fail all waiting
-    m_failed.unite(m_todo.toSet());
-    m_todo.clear();
-    // abort active
-    auto toKill = m_doing.toList();
-    for(auto index: toKill)
-    {
-        auto part = downloads[index];
-        fullyAborted &= part->abort();
-    }
-    return fullyAborted;
-}
+        // connect signals :D
+        connect(part.get(), &NetAction::succeeded, this, &NetJob::partSucceeded);
+        connect(part.get(), &NetAction::failed, this, &NetJob::partFailed);
+        connect(part.get(), &NetAction::aborted, this, &NetJob::partAborted);
+        connect(part.get(), &NetAction::netActionProgress, this, &NetJob::partProgress);
 
-bool NetJob::addNetAction(NetAction::Ptr action)
-{
-    action->m_index_within_job = downloads.size();
-    downloads.append(action);
-    part_info pi;
-    parts_progress.append(pi);
-    partProgress(parts_progress.count() - 1, action->currentProgress(), action->totalProgress());
-
-    if(action->isRunning())
-    {
-        connect(action.get(), SIGNAL(succeeded(int)), SLOT(partSucceeded(int)));
-        connect(action.get(), SIGNAL(failed(int)), SLOT(partFailed(int)));
-        connect(action.get(), SIGNAL(netActionProgress(int, qint64, qint64)), SLOT(partProgress(int, qint64, qint64)));
+        part->startAction(m_network);
     }
-    else
-    {
-        m_todo.append(parts_progress.size() - 1);
-    }
-    return true;
 }
-
-NetJob::~NetJob() = default;
diff --git a/launcher/net/NetJob.h b/launcher/net/NetJob.h
index fdea710f..c397e2a1 100644
--- a/launcher/net/NetJob.h
+++ b/launcher/net/NetJob.h
@@ -1,88 +1,97 @@
-/* Copyright 2013-2021 MultiMC Contributors
+// SPDX-License-Identifier: GPL-3.0-only
+/*
+ *  PolyMC - Minecraft Launcher
  *
- * 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
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
  *
- *     http://www.apache.org/licenses/LICENSE-2.0
+ *  This program 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 General Public License for more details.
  *
- * 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.
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * This file incorporates work covered by the following copyright and
+ * permission notice:
+ *
+ *      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 <QtNetwork>
+
+#include <QObject>
 #include "NetAction.h"
-#include "Download.h"
-#include "HttpMetaCache.h"
 #include "tasks/Task.h"
-#include "QObjectPtr.h"
 
-class NetJob;
+// Those are included so that they are also included by anyone using NetJob
+#include "net/Download.h"
+#include "net/HttpMetaCache.h"
 
-class NetJob : public Task
-{
+class NetJob : public Task {
     Q_OBJECT
-public:
+
+   public:
     using Ptr = shared_qobject_ptr<NetJob>;
 
     explicit NetJob(QString job_name, shared_qobject_ptr<QNetworkAccessManager> network) : Task(), m_network(network)
     {
         setObjectName(job_name);
     }
-    virtual ~NetJob();
+    virtual ~NetJob() = default;
 
-    bool addNetAction(NetAction::Ptr action);
+    void executeTask() override;
 
-    NetAction::Ptr operator[](int index)
-    {
-        return downloads[index];
-    }
-    const NetAction::Ptr at(const int index)
-    {
-        return downloads.at(index);
-    }
-    NetAction::Ptr first()
-    {
-        if (downloads.size())
-            return downloads[0];
-        return NetAction::Ptr();
-    }
-    int size() const
-    {
-        return downloads.size();
-    }
-    QStringList getFailedFiles();
+    auto canAbort() const -> bool override;
 
-    bool canAbort() const override;
+    auto addNetAction(NetAction::Ptr action) -> bool;
 
-private slots:
-    void startMoreParts();
+    auto operator[](int index) -> NetAction::Ptr { return m_downloads[index]; }
+    auto at(int index) -> const NetAction::Ptr { return m_downloads.at(index); }
+    auto size() const -> int { return m_downloads.size(); }
+    auto first() -> NetAction::Ptr { return m_downloads.size() != 0 ? m_downloads[0] : NetAction::Ptr{}; }
 
-public slots:
-    virtual void executeTask() override;
-    virtual bool abort() override;
+    auto getFailedFiles() -> QStringList;
+
+   public slots:
+    // Qt can't handle auto at the start for some reason?
+    bool abort() override;
+
+   private slots:
+    void startMoreParts();
 
-private slots:
     void partProgress(int index, qint64 bytesReceived, qint64 bytesTotal);
     void partSucceeded(int index);
     void partFailed(int index);
     void partAborted(int index);
 
-private:
+   private:
     shared_qobject_ptr<QNetworkAccessManager> m_network;
 
-    struct part_info
-    {
+    struct part_info {
         qint64 current_progress = 0;
         qint64 total_progress = 1;
         int failures = 0;
     };
-    QList<NetAction::Ptr> downloads;
-    QList<part_info> parts_progress;
+
+    QList<NetAction::Ptr> m_downloads;
+    QList<part_info> m_parts_progress;
     QQueue<int> m_todo;
     QSet<int> m_doing;
     QSet<int> m_done;
diff --git a/launcher/net/Sink.h b/launcher/net/Sink.h
index d367fb15..3b2a7f8d 100644
--- a/launcher/net/Sink.h
+++ b/launcher/net/Sink.h
@@ -5,33 +5,30 @@
 #include "Validator.h"
 
 namespace Net {
-class Sink
-{
-public: /* con/des */
-    Sink() {};
-    virtual ~Sink() {};
+class Sink {
+   public:
+    Sink() = default;
+    virtual ~Sink(){};
 
-public: /* methods */
-    virtual JobStatus init(QNetworkRequest & request) = 0;
-    virtual JobStatus write(QByteArray & data) = 0;
-    virtual JobStatus abort() = 0;
-    virtual JobStatus finalize(QNetworkReply & reply) = 0;
+   public:
+    virtual Task::State init(QNetworkRequest& request) = 0;
+    virtual Task::State write(QByteArray& data) = 0;
+    virtual Task::State abort() = 0;
+    virtual Task::State finalize(QNetworkReply& reply) = 0;
     virtual bool hasLocalData() = 0;
 
-    void addValidator(Validator * validator)
+    void addValidator(Validator* validator)
     {
-        if(validator)
-        {
+        if (validator) {
             validators.push_back(std::shared_ptr<Validator>(validator));
         }
     }
 
-protected: /* methods */
-    bool finalizeAllValidators(QNetworkReply & reply)
+   protected: /* methods */
+    bool finalizeAllValidators(QNetworkReply& reply)
     {
-        for(auto & validator: validators)
-        {
-            if(!validator->validate(reply))
+        for (auto& validator : validators) {
+            if (!validator->validate(reply))
                 return false;
         }
         return true;
@@ -39,32 +36,29 @@ protected: /* methods */
     bool failAllValidators()
     {
         bool success = true;
-        for(auto & validator: validators)
-        {
+        for (auto& validator : validators) {
             success &= validator->abort();
         }
         return success;
     }
-    bool initAllValidators(QNetworkRequest & request)
+    bool initAllValidators(QNetworkRequest& request)
     {
-        for(auto & validator: validators)
-        {
-            if(!validator->init(request))
+        for (auto& validator : validators) {
+            if (!validator->init(request))
                 return false;
         }
         return true;
     }
-    bool writeAllValidators(QByteArray & data)
+    bool writeAllValidators(QByteArray& data)
     {
-        for(auto & validator: validators)
-        {
-            if(!validator->write(data))
+        for (auto& validator : validators) {
+            if (!validator->write(data))
                 return false;
         }
         return true;
     }
 
-protected: /* data */
+   protected: /* data */
     std::vector<std::shared_ptr<Validator>> validators;
 };
-}
+}  // namespace Net