NOISSUE reorganize and document libraries

15 files changed, 1556 insertions, 0 deletions

diff --git a/api/logic/net/ByteArrayDownload.cpp b/api/logic/net/ByteArrayDownload.cpp
new file mode 100644
index 00000000..21990eeb
--- /dev/null
+++ b/api/logic/net/ByteArrayDownload.cpp
@@ -0,0 +1,105 @@
+/* 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.
+ */
+
+#include "ByteArrayDownload.h"
+#include "Env.h"
+#include <QDebug>
+
+ByteArrayDownload::ByteArrayDownload(QUrl url) : NetAction()
+{
+	m_url = url;
+	m_status = Job_NotStarted;
+}
+
+void ByteArrayDownload::start()
+{
+	qDebug() << "Downloading " << m_url.toString();
+	QNetworkRequest request(m_url);
+	request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Uncached)");
+	auto worker = ENV.qnam();
+	QNetworkReply *rep = worker->get(request);
+
+	m_reply.reset(rep);
+	connect(rep, SIGNAL(downloadProgress(qint64, qint64)),
+			SLOT(downloadProgress(qint64, qint64)));
+	connect(rep, SIGNAL(finished()), SLOT(downloadFinished()));
+	connect(rep, SIGNAL(error(QNetworkReply::NetworkError)),
+			SLOT(downloadError(QNetworkReply::NetworkError)));
+	connect(rep, SIGNAL(readyRead()), SLOT(downloadReadyRead()));
+}
+
+void ByteArrayDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
+{
+	m_total_progress = bytesTotal;
+	m_progress = bytesReceived;
+	emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
+}
+
+void ByteArrayDownload::downloadError(QNetworkReply::NetworkError error)
+{
+	// error happened during download.
+	qCritical() << "Error getting URL:" << m_url.toString().toLocal8Bit()
+				 << "Network error: " << error;
+	m_status = Job_Failed;
+	m_errorString = m_reply->errorString();
+}
+
+void ByteArrayDownload::downloadFinished()
+{
+	QVariant redirect = m_reply->header(QNetworkRequest::LocationHeader);
+	QString redirectURL;
+	if(redirect.isValid())
+	{
+		redirectURL = redirect.toString();
+	}
+	// FIXME: This is a hack for https://bugreports.qt-project.org/browse/QTBUG-41061
+	else if(m_reply->hasRawHeader("Location"))
+	{
+		auto data = m_reply->rawHeader("Location");
+		if(data.size() > 2 && data[0] == '/' && data[1] == '/')
+			redirectURL = m_reply->url().scheme() + ":" + data;
+	}
+	if (!redirectURL.isEmpty())
+	{
+		m_url = QUrl(redirect.toString());
+		qDebug() << "Following redirect to " << m_url.toString();
+		start();
+		return;
+	}
+
+	// if the download succeeded
+	if (m_status != Job_Failed)
+	{
+		// nothing went wrong...
+		m_status = Job_Finished;
+		m_data = m_reply->readAll();
+		m_content_type = m_reply->header(QNetworkRequest::ContentTypeHeader).toString();
+		m_reply.reset();
+		emit succeeded(m_index_within_job);
+		return;
+	}
+	// else the download failed
+	else
+	{
+		m_reply.reset();
+		emit failed(m_index_within_job);
+		return;
+	}
+}
+
+void ByteArrayDownload::downloadReadyRead()
+{
+	// ~_~
+}
diff --git a/api/logic/net/ByteArrayDownload.h b/api/logic/net/ByteArrayDownload.h
new file mode 100644
index 00000000..e2fc2911
--- /dev/null
+++ b/api/logic/net/ByteArrayDownload.h
@@ -0,0 +1,48 @@
+/* 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 "NetAction.h"
+
+#include "multimc_logic_export.h"
+
+typedef std::shared_ptr<class ByteArrayDownload> ByteArrayDownloadPtr;
+class MULTIMC_LOGIC_EXPORT ByteArrayDownload : public NetAction
+{
+	Q_OBJECT
+public:
+	ByteArrayDownload(QUrl url);
+	static ByteArrayDownloadPtr make(QUrl url)
+	{
+		return ByteArrayDownloadPtr(new ByteArrayDownload(url));
+	}
+    virtual ~ByteArrayDownload() {};
+public:
+	/// if not saving to file, downloaded data is placed here
+	QByteArray m_data;
+
+	QString m_errorString;
+
+public
+slots:
+	virtual void start();
+
+protected
+slots:
+	void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);
+	void downloadError(QNetworkReply::NetworkError error);
+	void downloadFinished();
+	void downloadReadyRead();
+};
diff --git a/api/logic/net/CacheDownload.cpp b/api/logic/net/CacheDownload.cpp
new file mode 100644
index 00000000..1ac55180
--- /dev/null
+++ b/api/logic/net/CacheDownload.cpp
@@ -0,0 +1,192 @@
+/* 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.
+ */
+
+#include "CacheDownload.h"
+
+#include <QCryptographicHash>
+#include <QFileInfo>
+#include <QDateTime>
+#include <QDebug>
+#include "Env.h"
+#include <FileSystem.h>
+
+CacheDownload::CacheDownload(QUrl url, MetaEntryPtr entry)
+	: NetAction(), md5sum(QCryptographicHash::Md5)
+{
+	m_url = url;
+	m_entry = entry;
+	m_target_path = entry->getFullPath();
+	m_status = Job_NotStarted;
+}
+
+void CacheDownload::start()
+{
+	m_status = Job_InProgress;
+	if (!m_entry->isStale())
+	{
+		m_status = Job_Finished;
+		emit succeeded(m_index_within_job);
+		return;
+	}
+	// create a new save file
+	m_output_file.reset(new QSaveFile(m_target_path));
+
+	// if there already is a file and md5 checking is in effect and it can be opened
+	if (!FS::ensureFilePathExists(m_target_path))
+	{
+		qCritical() << "Could not create folder for " + m_target_path;
+		m_status = Job_Failed;
+		emit failed(m_index_within_job);
+		return;
+	}
+	if (!m_output_file->open(QIODevice::WriteOnly))
+	{
+		qCritical() << "Could not open " + m_target_path + " for writing";
+		m_status = Job_Failed;
+		emit failed(m_index_within_job);
+		return;
+	}
+	qDebug() << "Downloading " << m_url.toString();
+	QNetworkRequest request(m_url);
+
+	// check file consistency first.
+	QFile current(m_target_path);
+	if(current.exists() && current.size() != 0)
+	{
+		if (m_entry->getRemoteChangedTimestamp().size())
+			request.setRawHeader(QString("If-Modified-Since").toLatin1(),
+								m_entry->getRemoteChangedTimestamp().toLatin1());
+		if (m_entry->getETag().size())
+			request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->getETag().toLatin1());
+	}
+
+	request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Cached)");
+
+	auto worker = ENV.qnam();
+	QNetworkReply *rep = worker->get(request);
+
+	m_reply.reset(rep);
+	connect(rep, SIGNAL(downloadProgress(qint64, qint64)),
+			SLOT(downloadProgress(qint64, qint64)));
+	connect(rep, SIGNAL(finished()), SLOT(downloadFinished()));
+	connect(rep, SIGNAL(error(QNetworkReply::NetworkError)),
+			SLOT(downloadError(QNetworkReply::NetworkError)));
+	connect(rep, SIGNAL(readyRead()), SLOT(downloadReadyRead()));
+}
+
+void CacheDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
+{
+	m_total_progress = bytesTotal;
+	m_progress = bytesReceived;
+	emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
+}
+
+void CacheDownload::downloadError(QNetworkReply::NetworkError error)
+{
+	// error happened during download.
+	qCritical() << "Failed " << m_url.toString() << " with reason " << error;
+	m_status = Job_Failed;
+}
+void CacheDownload::downloadFinished()
+{
+	QVariant redirect = m_reply->header(QNetworkRequest::LocationHeader);
+	QString redirectURL;
+	if(redirect.isValid())
+	{
+		redirectURL = redirect.toString();
+	}
+	// FIXME: This is a hack for https://bugreports.qt-project.org/browse/QTBUG-41061
+	else if(m_reply->hasRawHeader("Location"))
+	{
+		auto data = m_reply->rawHeader("Location");
+		if(data.size() > 2 && data[0] == '/' && data[1] == '/')
+			redirectURL = m_reply->url().scheme() + ":" + data;
+	}
+	if (!redirectURL.isEmpty())
+	{
+		m_url = QUrl(redirect.toString());
+		qDebug() << "Following redirect to " << m_url.toString();
+		start();
+		return;
+	}
+
+	// if the download succeeded
+	if (m_status == Job_Failed)
+	{
+		m_output_file->cancelWriting();
+		m_reply.reset();
+		emit failed(m_index_within_job);
+		return;
+	}
+
+	// if we wrote any data to the save file, we try to commit the data to the real file.
+	if (wroteAnyData)
+	{
+		// nothing went wrong...
+		if (m_output_file->commit())
+		{
+			m_status = Job_Finished;
+			m_entry->setMD5Sum(md5sum.result().toHex().constData());
+		}
+		else
+		{
+			qCritical() << "Failed to commit changes to " << m_target_path;
+			m_output_file->cancelWriting();
+			m_reply.reset();
+			m_status = Job_Failed;
+			emit failed(m_index_within_job);
+			return;
+		}
+	}
+	else
+	{
+		m_status = Job_Finished;
+	}
+
+	// then get rid of the save file
+	m_output_file.reset();
+
+	QFileInfo output_file_info(m_target_path);
+
+	m_entry->setETag(m_reply->rawHeader("ETag").constData());
+	if (m_reply->hasRawHeader("Last-Modified"))
+	{
+		m_entry->setRemoteChangedTimestamp(m_reply->rawHeader("Last-Modified").constData());
+	}
+	m_entry->setLocalChangedTimestamp(output_file_info.lastModified().toUTC().toMSecsSinceEpoch());
+	m_entry->setStale(false);
+	ENV.metacache()->updateEntry(m_entry);
+
+	m_reply.reset();
+	emit succeeded(m_index_within_job);
+	return;
+}
+
+void CacheDownload::downloadReadyRead()
+{
+	QByteArray ba = m_reply->readAll();
+	md5sum.addData(ba);
+	if (m_output_file->write(ba) != ba.size())
+	{
+		qCritical() << "Failed writing into " + m_target_path;
+		m_status = Job_Failed;
+		m_output_file->cancelWriting();
+		m_output_file.reset();
+		emit failed(m_index_within_job);
+		wroteAnyData = false;
+		return;
+	}
+	wroteAnyData = true;
+}
diff --git a/api/logic/net/CacheDownload.h b/api/logic/net/CacheDownload.h
new file mode 100644
index 00000000..d83b2a0f
--- /dev/null
+++ b/api/logic/net/CacheDownload.h
@@ -0,0 +1,63 @@
+/* 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 "NetAction.h"
+#include "HttpMetaCache.h"
+#include <QCryptographicHash>
+#include <QSaveFile>
+
+#include "multimc_logic_export.h"
+
+typedef std::shared_ptr<class CacheDownload> CacheDownloadPtr;
+class MULTIMC_LOGIC_EXPORT CacheDownload : public NetAction
+{
+	Q_OBJECT
+private:
+	MetaEntryPtr m_entry;
+	/// if saving to file, use the one specified in this string
+	QString m_target_path;
+
+	/// this is the output file, if any
+	std::unique_ptr<QSaveFile> m_output_file;
+
+	/// the hash-as-you-download
+	QCryptographicHash md5sum;
+
+	bool wroteAnyData = false;
+
+public:
+	explicit CacheDownload(QUrl url, MetaEntryPtr entry);
+	static CacheDownloadPtr make(QUrl url, MetaEntryPtr entry)
+	{
+		return CacheDownloadPtr(new CacheDownload(url, entry));
+	}
+	virtual ~CacheDownload(){};
+	QString getTargetFilepath()
+	{
+		return m_target_path;
+	}
+protected
+slots:
+	virtual void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);
+	virtual void downloadError(QNetworkReply::NetworkError error);
+	virtual void downloadFinished();
+	virtual void downloadReadyRead();
+
+public
+slots:
+	virtual void start();
+};
diff --git a/api/logic/net/HttpMetaCache.cpp b/api/logic/net/HttpMetaCache.cpp
new file mode 100644
index 00000000..ea3e2834
--- /dev/null
+++ b/api/logic/net/HttpMetaCache.cpp
@@ -0,0 +1,273 @@
+/* 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.
+ */
+
+#include "Env.h"
+#include "HttpMetaCache.h"
+#include "FileSystem.h"
+
+#include <QFileInfo>
+#include <QFile>
+#include <QDateTime>
+#include <QCryptographicHash>
+
+#include <QDebug>
+
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonObject>
+
+QString MetaEntry::getFullPath()
+{
+	// FIXME: make local?
+	return FS::PathCombine(basePath, relativePath);
+}
+
+HttpMetaCache::HttpMetaCache(QString path) : QObject()
+{
+	m_index_file = path;
+	saveBatchingTimer.setSingleShot(true);
+	saveBatchingTimer.setTimerType(Qt::VeryCoarseTimer);
+	connect(&saveBatchingTimer, SIGNAL(timeout()), SLOT(SaveNow()));
+}
+
+HttpMetaCache::~HttpMetaCache()
+{
+	saveBatchingTimer.stop();
+	SaveNow();
+}
+
+MetaEntryPtr HttpMetaCache::getEntry(QString base, QString resource_path)
+{
+	// no base. no base path. can't store
+	if (!m_entries.contains(base))
+	{
+		// TODO: log problem
+		return MetaEntryPtr();
+	}
+	EntryMap &map = m_entries[base];
+	if (map.entry_list.contains(resource_path))
+	{
+		return map.entry_list[resource_path];
+	}
+	return MetaEntryPtr();
+}
+
+MetaEntryPtr HttpMetaCache::resolveEntry(QString base, QString resource_path, QString expected_etag)
+{
+	auto entry = getEntry(base, resource_path);
+	// it's not present? generate a default stale entry
+	if (!entry)
+	{
+		return staleEntry(base, resource_path);
+	}
+
+	auto &selected_base = m_entries[base];
+	QString real_path = FS::PathCombine(selected_base.base_path, resource_path);
+	QFileInfo finfo(real_path);
+
+	// is the file really there? if not -> stale
+	if (!finfo.isFile() || !finfo.isReadable())
+	{
+		// if the file doesn't exist, we disown the entry
+		selected_base.entry_list.remove(resource_path);
+		return staleEntry(base, resource_path);
+	}
+
+	if (!expected_etag.isEmpty() && expected_etag != entry->etag)
+	{
+		// if the etag doesn't match expected, we disown the entry
+		selected_base.entry_list.remove(resource_path);
+		return staleEntry(base, resource_path);
+	}
+
+	// if the file changed, check md5sum
+	qint64 file_last_changed = finfo.lastModified().toUTC().toMSecsSinceEpoch();
+	if (file_last_changed != entry->local_changed_timestamp)
+	{
+		QFile input(real_path);
+		input.open(QIODevice::ReadOnly);
+		QString md5sum = QCryptographicHash::hash(input.readAll(), QCryptographicHash::Md5)
+							 .toHex()
+							 .constData();
+		if (entry->md5sum != md5sum)
+		{
+			selected_base.entry_list.remove(resource_path);
+			return staleEntry(base, resource_path);
+		}
+		// md5sums matched... keep entry and save the new state to file
+		entry->local_changed_timestamp = file_last_changed;
+		SaveEventually();
+	}
+
+	// entry passed all the checks we cared about.
+	entry->basePath = getBasePath(base);
+	return entry;
+}
+
+bool HttpMetaCache::updateEntry(MetaEntryPtr stale_entry)
+{
+	if (!m_entries.contains(stale_entry->baseId))
+	{
+		qCritical() << "Cannot add entry with unknown base: "
+					 << stale_entry->baseId.toLocal8Bit();
+		return false;
+	}
+	if (stale_entry->stale)
+	{
+		qCritical() << "Cannot add stale entry: " << stale_entry->getFullPath().toLocal8Bit();
+		return false;
+	}
+	m_entries[stale_entry->baseId].entry_list[stale_entry->relativePath] = stale_entry;
+	SaveEventually();
+	return true;
+}
+
+bool HttpMetaCache::evictEntry(MetaEntryPtr entry)
+{
+	if(entry)
+	{
+		entry->stale = true;
+		SaveEventually();
+		return true;
+	}
+	return false;
+}
+
+MetaEntryPtr HttpMetaCache::staleEntry(QString base, QString resource_path)
+{
+	auto foo = new MetaEntry();
+	foo->baseId = base;
+	foo->basePath = getBasePath(base);
+	foo->relativePath = resource_path;
+	foo->stale = true;
+	return MetaEntryPtr(foo);
+}
+
+void HttpMetaCache::addBase(QString base, QString base_root)
+{
+	// TODO: report error
+	if (m_entries.contains(base))
+		return;
+	// TODO: check if the base path is valid
+	EntryMap foo;
+	foo.base_path = base_root;
+	m_entries[base] = foo;
+}
+
+QString HttpMetaCache::getBasePath(QString base)
+{
+	if (m_entries.contains(base))
+	{
+		return m_entries[base].base_path;
+	}
+	return QString();
+}
+
+void HttpMetaCache::Load()
+{
+	if(m_index_file.isNull())
+		return;
+
+	QFile index(m_index_file);
+	if (!index.open(QIODevice::ReadOnly))
+		return;
+
+	QJsonDocument json = QJsonDocument::fromJson(index.readAll());
+	if (!json.isObject())
+		return;
+	auto root = json.object();
+	// check file version first
+	auto version_val = root.value("version");
+	if (!version_val.isString())
+		return;
+	if (version_val.toString() != "1")
+		return;
+
+	// read the entry array
+	auto entries_val = root.value("entries");
+	if (!entries_val.isArray())
+		return;
+	QJsonArray array = entries_val.toArray();
+	for (auto element : array)
+	{
+		if (!element.isObject())
+			return;
+		auto element_obj = element.toObject();
+		QString base = element_obj.value("base").toString();
+		if (!m_entries.contains(base))
+			continue;
+		auto &entrymap = m_entries[base];
+		auto foo = new MetaEntry();
+		foo->baseId = base;
+		QString path = foo->relativePath = element_obj.value("path").toString();
+		foo->md5sum = element_obj.value("md5sum").toString();
+		foo->etag = element_obj.value("etag").toString();
+		foo->local_changed_timestamp = element_obj.value("last_changed_timestamp").toDouble();
+		foo->remote_changed_timestamp =
+			element_obj.value("remote_changed_timestamp").toString();
+		// presumed innocent until closer examination
+		foo->stale = false;
+		entrymap.entry_list[path] = MetaEntryPtr(foo);
+	}
+}
+
+void HttpMetaCache::SaveEventually()
+{
+	// reset the save timer
+	saveBatchingTimer.stop();
+	saveBatchingTimer.start(30000);
+}
+
+void HttpMetaCache::SaveNow()
+{
+	if(m_index_file.isNull())
+		return;
+	QJsonObject toplevel;
+	toplevel.insert("version", QJsonValue(QString("1")));
+	QJsonArray entriesArr;
+	for (auto group : m_entries)
+	{
+		for (auto entry : group.entry_list)
+		{
+			// do not save stale entries. they are dead.
+			if(entry->stale)
+			{
+				continue;
+			}
+			QJsonObject entryObj;
+			entryObj.insert("base", QJsonValue(entry->baseId));
+			entryObj.insert("path", QJsonValue(entry->relativePath));
+			entryObj.insert("md5sum", QJsonValue(entry->md5sum));
+			entryObj.insert("etag", QJsonValue(entry->etag));
+			entryObj.insert("last_changed_timestamp",
+							QJsonValue(double(entry->local_changed_timestamp)));
+			if (!entry->remote_changed_timestamp.isEmpty())
+				entryObj.insert("remote_changed_timestamp",
+								QJsonValue(entry->remote_changed_timestamp));
+			entriesArr.append(entryObj);
+		}
+	}
+	toplevel.insert("entries", entriesArr);
+
+	QJsonDocument doc(toplevel);
+	try
+	{
+		FS::write(m_index_file, doc.toJson());
+	}
+	catch (Exception & e)
+	{
+		qWarning() << e.what();
+	}
+}
diff --git a/api/logic/net/HttpMetaCache.h b/api/logic/net/HttpMetaCache.h
new file mode 100644
index 00000000..7b626c70
--- /dev/null
+++ b/api/logic/net/HttpMetaCache.h
@@ -0,0 +1,125 @@
+/* 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 <QString>
+#include <QMap>
+#include <qtimer.h>
+#include <memory>
+
+#include "multimc_logic_export.h"
+
+class HttpMetaCache;
+
+class MULTIMC_LOGIC_EXPORT MetaEntry
+{
+friend class HttpMetaCache;
+protected:
+	MetaEntry() {}
+public:
+	bool isStale()
+	{
+		return stale;
+	}
+	void setStale(bool stale)
+	{
+		this->stale = stale;
+	}
+	QString getFullPath();
+	QString getRemoteChangedTimestamp()
+	{
+		return remote_changed_timestamp;
+	}
+	void setRemoteChangedTimestamp(QString remote_changed_timestamp)
+	{
+		this->remote_changed_timestamp = remote_changed_timestamp;
+	}
+	void setLocalChangedTimestamp(qint64 timestamp)
+	{
+		local_changed_timestamp = timestamp;
+	}
+	QString getETag()
+	{
+		return etag;
+	}
+	void setETag(QString etag)
+	{
+		this->etag = etag;
+	}
+	QString getMD5Sum()
+	{
+		return md5sum;
+	}
+	void setMD5Sum(QString md5sum)
+	{
+		this->md5sum = md5sum;
+	}
+protected:
+	QString baseId;
+	QString basePath;
+	QString relativePath;
+	QString md5sum;
+	QString etag;
+	qint64 local_changed_timestamp = 0;
+	QString remote_changed_timestamp; // QString for now, RFC 2822 encoded time
+	bool stale = true;
+};
+
+typedef std::shared_ptr<MetaEntry> MetaEntryPtr;
+
+class MULTIMC_LOGIC_EXPORT HttpMetaCache : public QObject
+{
+	Q_OBJECT
+public:
+	// supply path to the cache index file
+	HttpMetaCache(QString path = QString());
+	~HttpMetaCache();
+
+	// get the entry solely from the cache
+	// you probably don't want this, unless you have some specific caching needs.
+	MetaEntryPtr getEntry(QString base, QString resource_path);
+
+	// get the entry from cache and verify that it isn't stale (within reason)
+	MetaEntryPtr resolveEntry(QString base, QString resource_path,
+							  QString expected_etag = QString());
+
+	// add a previously resolved stale entry
+	bool updateEntry(MetaEntryPtr stale_entry);
+
+	// evict selected entry from cache
+	bool evictEntry(MetaEntryPtr entry);
+
+	void addBase(QString base, QString base_root);
+
+	// (re)start a timer that calls SaveNow later.
+	void SaveEventually();
+	void Load();
+	QString getBasePath(QString base);
+public
+slots:
+	void SaveNow();
+
+private:
+	// create a new stale entry, given the parameters
+	MetaEntryPtr staleEntry(QString base, QString resource_path);
+	struct EntryMap
+	{
+		QString base_path;
+		QMap<QString, MetaEntryPtr> entry_list;
+	};
+	QMap<QString, EntryMap> m_entries;
+	QString m_index_file;
+	QTimer saveBatchingTimer;
+};
diff --git a/api/logic/net/MD5EtagDownload.cpp b/api/logic/net/MD5EtagDownload.cpp
new file mode 100644
index 00000000..3b4d5dcd
--- /dev/null
+++ b/api/logic/net/MD5EtagDownload.cpp
@@ -0,0 +1,155 @@
+/* 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.
+ */
+
+#include "Env.h"
+#include "MD5EtagDownload.h"
+#include <FileSystem.h>
+#include <QCryptographicHash>
+#include <QDebug>
+
+MD5EtagDownload::MD5EtagDownload(QUrl url, QString target_path) : NetAction()
+{
+	m_url = url;
+	m_target_path = target_path;
+	m_status = Job_NotStarted;
+}
+
+void MD5EtagDownload::start()
+{
+	QString filename = m_target_path;
+	m_output_file.setFileName(filename);
+	// if there already is a file and md5 checking is in effect and it can be opened
+	if (m_output_file.exists() && m_output_file.open(QIODevice::ReadOnly))
+	{
+		// get the md5 of the local file.
+		m_local_md5 =
+			QCryptographicHash::hash(m_output_file.readAll(), QCryptographicHash::Md5)
+				.toHex()
+				.constData();
+		m_output_file.close();
+		// if we are expecting some md5sum, compare it with the local one
+		if (!m_expected_md5.isEmpty())
+		{
+			// skip if they match
+			if(m_local_md5 == m_expected_md5)
+			{
+				qDebug() << "Skipping " << m_url.toString() << ": md5 match.";
+				emit succeeded(m_index_within_job);
+				return;
+			}
+		}
+		else
+		{
+			// no expected md5. we use the local md5sum as an ETag
+		}
+	}
+	if (!FS::ensureFilePathExists(filename))
+	{
+		emit failed(m_index_within_job);
+		return;
+	}
+
+	QNetworkRequest request(m_url);
+
+	qDebug() << "Downloading " << m_url.toString() << " local MD5: " << m_local_md5;
+
+	if(!m_local_md5.isEmpty())
+	{
+		request.setRawHeader(QString("If-None-Match").toLatin1(), m_local_md5.toLatin1());
+	}
+	if(!m_expected_md5.isEmpty())
+		qDebug() << "Expecting " << m_expected_md5;
+
+	request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Uncached)");
+
+	// Go ahead and try to open the file.
+	// If we don't do this, empty files won't be created, which breaks the updater.
+	// Plus, this way, we don't end up starting a download for a file we can't open.
+	if (!m_output_file.open(QIODevice::WriteOnly))
+	{
+		emit failed(m_index_within_job);
+		return;
+	}
+
+	auto worker = ENV.qnam();
+	QNetworkReply *rep = worker->get(request);
+
+	m_reply.reset(rep);
+	connect(rep, SIGNAL(downloadProgress(qint64, qint64)),
+			SLOT(downloadProgress(qint64, qint64)));
+	connect(rep, SIGNAL(finished()), SLOT(downloadFinished()));
+	connect(rep, SIGNAL(error(QNetworkReply::NetworkError)),
+			SLOT(downloadError(QNetworkReply::NetworkError)));
+	connect(rep, SIGNAL(readyRead()), SLOT(downloadReadyRead()));
+}
+
+void MD5EtagDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
+{
+	m_total_progress = bytesTotal;
+	m_progress = bytesReceived;
+	emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
+}
+
+void MD5EtagDownload::downloadError(QNetworkReply::NetworkError error)
+{
+	qCritical() << "Error" << error << ":" << m_reply->errorString() << "while downloading"
+				 << m_reply->url();
+	m_status = Job_Failed;
+}
+
+void MD5EtagDownload::downloadFinished()
+{
+	// if the download succeeded
+	if (m_status != Job_Failed)
+	{
+		// nothing went wrong...
+		m_status = Job_Finished;
+		m_output_file.close();
+
+		// FIXME: compare with the real written data md5sum
+		// this is just an ETag
+		qDebug() << "Finished " << m_url.toString() << " got " << m_reply->rawHeader("ETag").constData();
+
+		m_reply.reset();
+		emit succeeded(m_index_within_job);
+		return;
+	}
+	// else the download failed
+	else
+	{
+		m_output_file.close();
+		m_output_file.remove();
+		m_reply.reset();
+		emit failed(m_index_within_job);
+		return;
+	}
+}
+
+void MD5EtagDownload::downloadReadyRead()
+{
+	if (!m_output_file.isOpen())
+	{
+		if (!m_output_file.open(QIODevice::WriteOnly))
+		{
+			/*
+			* Can't open the file... the job failed
+			*/
+			m_reply->abort();
+			emit failed(m_index_within_job);
+			return;
+		}
+	}
+	m_output_file.write(m_reply->readAll());
+}
diff --git a/api/logic/net/MD5EtagDownload.h b/api/logic/net/MD5EtagDownload.h
new file mode 100644
index 00000000..cd1cb550
--- /dev/null
+++ b/api/logic/net/MD5EtagDownload.h
@@ -0,0 +1,52 @@
+/* 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 "NetAction.h"
+#include <QFile>
+
+typedef std::shared_ptr<class MD5EtagDownload> Md5EtagDownloadPtr;
+class MD5EtagDownload : public NetAction
+{
+	Q_OBJECT
+public:
+	/// the expected md5 checksum. Only set from outside
+	QString m_expected_md5;
+	/// the md5 checksum of a file that already exists.
+	QString m_local_md5;
+	/// if saving to file, use the one specified in this string
+	QString m_target_path;
+	/// this is the output file, if any
+	QFile m_output_file;
+
+public:
+	explicit MD5EtagDownload(QUrl url, QString target_path);
+	static Md5EtagDownloadPtr make(QUrl url, QString target_path)
+	{
+		return Md5EtagDownloadPtr(new MD5EtagDownload(url, target_path));
+	}
+	virtual ~MD5EtagDownload(){};
+protected
+slots:
+	virtual void downloadProgress(qint64 bytesReceived, qint64 bytesTotal);
+	virtual void downloadError(QNetworkReply::NetworkError error);
+	virtual void downloadFinished();
+	virtual void downloadReadyRead();
+
+public
+slots:
+	virtual void start();
+};
diff --git a/api/logic/net/NetAction.h b/api/logic/net/NetAction.h
new file mode 100644
index 00000000..3c395605
--- /dev/null
+++ b/api/logic/net/NetAction.h
@@ -0,0 +1,96 @@
+/* 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 <QUrl>
+#include <memory>
+#include <QNetworkReply>
+#include <QObjectPtr.h>
+
+#include "multimc_logic_export.h"
+
+enum JobStatus
+{
+	Job_NotStarted,
+	Job_InProgress,
+	Job_Finished,
+	Job_Failed
+};
+
+typedef std::shared_ptr<class NetAction> NetActionPtr;
+class MULTIMC_LOGIC_EXPORT NetAction : public QObject
+{
+	Q_OBJECT
+protected:
+	explicit NetAction() : QObject(0) {};
+
+public:
+	virtual ~NetAction() {};
+
+public:
+	virtual qint64 totalProgress() const
+	{
+		return m_total_progress;
+	}
+	virtual qint64 currentProgress() const
+	{
+		return m_progress;
+	}
+	virtual qint64 numberOfFailures() const
+	{
+		return m_failures;
+	}
+
+public:
+	/// the network reply
+	unique_qobject_ptr<QNetworkReply> m_reply;
+
+	/// the content of the content-type header
+	QString m_content_type;
+
+	/// source URL
+	QUrl m_url;
+
+	/// The file's status
+	JobStatus m_status = Job_NotStarted;
+
+	/// index within the parent job
+	int m_index_within_job = 0;
+
+	qint64 m_progress = 0;
+	qint64 m_total_progress = 1;
+
+	/// number of failures up to this point
+	int m_failures = 0;
+
+signals:
+	void started(int index);
+	void netActionProgress(int index, qint64 current, qint64 total);
+	void succeeded(int index);
+	void failed(int index);
+
+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:
+	virtual void start() = 0;
+};
diff --git a/api/logic/net/NetJob.cpp b/api/logic/net/NetJob.cpp
new file mode 100644
index 00000000..76c61c35
--- /dev/null
+++ b/api/logic/net/NetJob.cpp
@@ -0,0 +1,125 @@
+/* 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.
+ */
+
+#include "NetJob.h"
+#include "MD5EtagDownload.h"
+#include "ByteArrayDownload.h"
+#include "CacheDownload.h"
+
+#include <QDebug>
+
+void NetJob::partSucceeded(int index)
+{
+	// do progress. all slots are 1 in size at least
+	auto &slot = parts_progress[index];
+	partProgress(index, slot.total_progress, slot.total_progress);
+
+	m_doing.remove(index);
+	m_done.insert(index);
+	downloads[index].get()->disconnect(this);
+	startMoreParts();
+}
+
+void NetJob::partFailed(int index)
+{
+	m_doing.remove(index);
+	auto &slot = parts_progress[index];
+	if (slot.failures == 3)
+	{
+		m_failed.insert(index);
+	}
+	else
+	{
+		slot.failures++;
+		m_todo.enqueue(index);
+	}
+	downloads[index].get()->disconnect(this);
+	startMoreParts();
+}
+
+void NetJob::partProgress(int index, qint64 bytesReceived, qint64 bytesTotal)
+{
+	auto &slot = parts_progress[index];
+
+	current_progress -= slot.current_progress;
+	slot.current_progress = bytesReceived;
+	current_progress += slot.current_progress;
+
+	total_progress -= slot.total_progress;
+	slot.total_progress = bytesTotal;
+	total_progress += slot.total_progress;
+	setProgress(current_progress, total_progress);
+}
+
+void NetJob::executeTask()
+{
+	qDebug() << m_job_name.toLocal8Bit() << " started.";
+	m_running = true;
+	for (int i = 0; i < downloads.size(); i++)
+	{
+		m_todo.enqueue(i);
+	}
+	// hack that delays early failures so they can be caught easier
+	QMetaObject::invokeMethod(this, "startMoreParts", Qt::QueuedConnection);
+}
+
+void NetJob::startMoreParts()
+{
+	// check for final conditions if there's nothing in the queue
+	if(!m_todo.size())
+	{
+		if(!m_doing.size())
+		{
+			if(!m_failed.size())
+			{
+				qDebug() << m_job_name << "succeeded.";
+				emitSucceeded();
+			}
+			else
+			{
+				qCritical() << m_job_name << "failed.";
+				emitFailed(tr("Job '%1' failed to process:\n%2").arg(m_job_name).arg(getFailedFiles().join("\n")));
+			}
+		}
+		return;
+	}
+	// otherwise try to start more parts
+	while (m_doing.size() < 6)
+	{
+		if(!m_todo.size())
+			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(netActionProgress(int, qint64, qint64)),
+				SLOT(partProgress(int, qint64, qint64)));
+		part->start();
+	}
+}
+
+
+QStringList NetJob::getFailedFiles()
+{
+	QStringList failed;
+	for (auto index: m_failed)
+	{
+		failed.push_back(downloads[index]->m_url.toString());
+	}
+	failed.sort();
+	return failed;
+}
diff --git a/api/logic/net/NetJob.h b/api/logic/net/NetJob.h
new file mode 100644
index 00000000..167fe176
--- /dev/null
+++ b/api/logic/net/NetJob.h
@@ -0,0 +1,117 @@
+/* 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 <QtNetwork>
+#include "NetAction.h"
+#include "ByteArrayDownload.h"
+#include "MD5EtagDownload.h"
+#include "CacheDownload.h"
+#include "HttpMetaCache.h"
+#include "tasks/Task.h"
+#include "QObjectPtr.h"
+
+#include "multimc_logic_export.h"
+
+class NetJob;
+typedef shared_qobject_ptr<NetJob> NetJobPtr;
+
+class MULTIMC_LOGIC_EXPORT NetJob : public Task
+{
+	Q_OBJECT
+public:
+	explicit NetJob(QString job_name) : Task(), m_job_name(job_name) {}
+	virtual ~NetJob() {}
+	bool addNetAction(NetActionPtr action)
+	{
+		action->m_index_within_job = downloads.size();
+		downloads.append(action);
+		part_info pi;
+		{
+			pi.current_progress = action->currentProgress();
+			pi.total_progress = action->totalProgress();
+			pi.failures = action->numberOfFailures();
+		}
+		parts_progress.append(pi);
+		total_progress += pi.total_progress;
+		// if this is already running, the action needs to be started right away!
+		if (isRunning())
+		{
+			setProgress(current_progress, total_progress);
+			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)));
+			action->start();
+		}
+		return true;
+	}
+
+	NetActionPtr operator[](int index)
+	{
+		return downloads[index];
+	}
+	const NetActionPtr at(const int index)
+	{
+		return downloads.at(index);
+	}
+	NetActionPtr first()
+	{
+		if (downloads.size())
+			return downloads[0];
+		return NetActionPtr();
+	}
+	int size() const
+	{
+		return downloads.size();
+	}
+	virtual bool isRunning() const
+	{
+		return m_running;
+	}
+	QStringList getFailedFiles();
+
+private slots:
+	void startMoreParts();
+
+public slots:
+	virtual void executeTask();
+	// FIXME: implement
+	virtual bool abort() {return false;};
+
+private slots:
+	void partProgress(int index, qint64 bytesReceived, qint64 bytesTotal);
+	void partSucceeded(int index);
+	void partFailed(int index);
+
+private:
+	struct part_info
+	{
+		qint64 current_progress = 0;
+		qint64 total_progress = 1;
+		int failures = 0;
+		bool connected = false;
+	};
+	QString m_job_name;
+	QList<NetActionPtr> downloads;
+	QList<part_info> parts_progress;
+	QQueue<int> m_todo;
+	QSet<int> m_doing;
+	QSet<int> m_done;
+	QSet<int> m_failed;
+	qint64 current_progress = 0;
+	qint64 total_progress = 0;
+	bool m_running = false;
+};
diff --git a/api/logic/net/PasteUpload.cpp b/api/logic/net/PasteUpload.cpp
new file mode 100644
index 00000000..4b671d6f
--- /dev/null
+++ b/api/logic/net/PasteUpload.cpp
@@ -0,0 +1,99 @@
+#include "PasteUpload.h"
+#include "Env.h"
+#include <QDebug>
+#include <QJsonObject>
+#include <QJsonDocument>
+
+PasteUpload::PasteUpload(QWidget *window, QString text, QString key) : m_window(window)
+{
+	m_key = key;
+	QByteArray temp;
+	temp = text.toUtf8();
+	temp.replace('\n', "\r\n");
+	m_textSize = temp.size();
+	m_text = "key=" + m_key.toLatin1() + "&description=MultiMC5+Log+File&language=plain&format=json&expire=2592000&paste=" + temp.toPercentEncoding();
+	buf =  new QBuffer(&m_text);
+}
+
+PasteUpload::~PasteUpload()
+{
+	if(buf)
+	{
+		delete buf;
+	}
+}
+
+bool PasteUpload::validateText()
+{
+	return m_textSize <= maxSize();
+}
+
+void PasteUpload::executeTask()
+{
+	QNetworkRequest request(QUrl("http://paste.ee/api"));
+	request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Uncached)");
+
+	request.setRawHeader("Content-Type", "application/x-www-form-urlencoded");
+	request.setRawHeader("Content-Length", QByteArray::number(m_text.size()));
+
+	auto worker = ENV.qnam();
+	QNetworkReply *rep = worker->post(request, buf);
+
+	m_reply = std::shared_ptr<QNetworkReply>(rep);
+	setStatus(tr("Uploading to paste.ee"));
+	connect(rep, &QNetworkReply::uploadProgress, this, &Task::setProgress);
+	connect(rep, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(downloadError(QNetworkReply::NetworkError)));
+	connect(rep, SIGNAL(finished()), this, SLOT(downloadFinished()));
+}
+
+void PasteUpload::downloadError(QNetworkReply::NetworkError error)
+{
+	// error happened during download.
+	qCritical() << "Network error: " << error;
+	emitFailed(m_reply->errorString());
+}
+
+void PasteUpload::downloadFinished()
+{
+	// if the download succeeded
+	if (m_reply->error() == QNetworkReply::NetworkError::NoError)
+	{
+		QByteArray data = m_reply->readAll();
+		m_reply.reset();
+		QJsonParseError jsonError;
+		QJsonDocument doc = QJsonDocument::fromJson(data, &jsonError);
+		if (jsonError.error != QJsonParseError::NoError)
+		{
+			emitFailed(jsonError.errorString());
+			return;
+		}
+		if (!parseResult(doc))
+		{
+			emitFailed(tr("paste.ee returned an error. Please consult the logs for more information"));
+			return;
+		}
+	}
+	// else the download failed
+	else
+	{
+		emitFailed(QString("Network error: %1").arg(m_reply->errorString()));
+		m_reply.reset();
+		return;
+	}
+	emitSucceeded();
+}
+
+bool PasteUpload::parseResult(QJsonDocument doc)
+{
+	auto object = doc.object();
+	auto status = object.value("status").toString("error");
+	if (status == "error")
+	{
+		qCritical() << "paste.ee reported error:" << QString(object.value("error").toString());
+		return false;
+	}
+	m_pasteLink = object.value("paste").toObject().value("link").toString();
+	m_pasteID = object.value("paste").toObject().value("id").toString();
+	return true;
+}
+
diff --git a/api/logic/net/PasteUpload.h b/api/logic/net/PasteUpload.h
new file mode 100644
index 00000000..06e3f955
--- /dev/null
+++ b/api/logic/net/PasteUpload.h
@@ -0,0 +1,50 @@
+#pragma once
+#include "tasks/Task.h"
+#include <QNetworkReply>
+#include <QBuffer>
+#include <memory>
+
+#include "multimc_logic_export.h"
+
+class MULTIMC_LOGIC_EXPORT PasteUpload : public Task
+{
+	Q_OBJECT
+public:
+	PasteUpload(QWidget *window, QString text, QString key = "public");
+	virtual ~PasteUpload();
+	QString pasteLink()
+	{
+		return m_pasteLink;
+	}
+	QString pasteID()
+	{
+		return m_pasteID;
+	}
+	uint32_t maxSize()
+	{
+		// 2MB for paste.ee - public
+		if(m_key == "public")
+			return 1024*1024*2;
+		// 12MB for paste.ee - with actual key
+		return 1024*1024*12;
+	}
+	bool validateText();
+protected:
+	virtual void executeTask();
+
+private:
+	bool parseResult(QJsonDocument doc);
+	QByteArray m_text;
+	QString m_error;
+	QWidget *m_window;
+	QString m_pasteID;
+	QString m_pasteLink;
+	QString m_key;
+	int m_textSize = 0;
+	QBuffer * buf = nullptr;
+	std::shared_ptr<QNetworkReply> m_reply;
+public
+slots:
+	void downloadError(QNetworkReply::NetworkError);
+	void downloadFinished();
+};
diff --git a/api/logic/net/URLConstants.cpp b/api/logic/net/URLConstants.cpp
new file mode 100644
index 00000000..bd476b2c
--- /dev/null
+++ b/api/logic/net/URLConstants.cpp
@@ -0,0 +1,16 @@
+#include "URLConstants.h"
+
+namespace URLConstants {
+
+QString getLegacyJarUrl(QString version)
+{
+	return "http://" + AWS_DOWNLOAD_VERSIONS + getJarPath(version);
+}
+
+QString getJarPath(QString version)
+{
+	return version + "/" + version + ".jar";
+}
+
+
+}
diff --git a/api/logic/net/URLConstants.h b/api/logic/net/URLConstants.h
new file mode 100644
index 00000000..8923ef54
--- /dev/null
+++ b/api/logic/net/URLConstants.h
@@ -0,0 +1,40 @@
+/* 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 <QString>
+
+namespace URLConstants
+{
+const QString AWS_DOWNLOAD_VERSIONS("s3.amazonaws.com/Minecraft.Download/versions/");
+const QString RESOURCE_BASE("resources.download.minecraft.net/");
+const QString LIBRARY_BASE("libraries.minecraft.net/");
+//const QString SKINS_BASE("skins.minecraft.net/MinecraftSkins/");
+const QString SKINS_BASE("crafatar.com/skins/");
+const QString AUTH_BASE("authserver.mojang.com/");
+const QString FORGE_LEGACY_URL("http://files.minecraftforge.net/minecraftforge/json");
+const QString FORGE_GRADLE_URL("http://files.minecraftforge.net/maven/net/minecraftforge/forge/json");
+const QString MOJANG_STATUS_URL("http://status.mojang.com/check");
+const QString MOJANG_STATUS_NEWS_URL("http://status.mojang.com/news");
+const QString LITELOADER_URL("http://dl.liteloader.com/versions/versions.json");
+const QString IMGUR_BASE_URL("https://api.imgur.com/3/");
+const QString FMLLIBS_OUR_BASE_URL("http://files.multimc.org/fmllibs/");
+const QString FMLLIBS_FORGE_BASE_URL("http://files.minecraftforge.net/fmllibs/");
+const QString TRANSLATIONS_BASE_URL("http://files.multimc.org/translations/");
+
+QString getJarPath(QString version);
+QString getLegacyJarUrl(QString version);
+}