Added a system to load news from MultiMC.org's RSS

Currently it doesn't show it anywhere in the UI. That's next.

1 files changed, 130 insertions, 0 deletions

diff --git a/logic/news/NewsChecker.cpp b/logic/news/NewsChecker.cpp
new file mode 100644
index 00000000..08d4ef23
--- /dev/null
+++ b/logic/news/NewsChecker.cpp
@@ -0,0 +1,130 @@
+/* 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.
+ */
+
+#include "NewsChecker.h"
+
+#include <QByteArray>
+#include <QDomDocument>
+
+#include <logger/QsLog.h>
+
+NewsChecker::NewsChecker(const QString& feedUrl)
+{
+	m_feedUrl = feedUrl;
+}
+
+void NewsChecker::reloadNews()
+{
+	// Start a netjob to download the RSS feed and call rssDownloadFinished() when it's done.
+	if (isLoadingNews())
+	{
+		QLOG_INFO() << "Ignored request to reload news. Currently reloading already.";
+		return;
+	}
+	
+	QLOG_INFO() << "Reloading news.";
+
+	NetJob* job = new NetJob("News RSS Feed");
+	job->addNetAction(ByteArrayDownload::make(m_feedUrl));
+	QObject::connect(job, &NetJob::succeeded, this, &NewsChecker::rssDownloadFinished);
+	QObject::connect(job, &NetJob::failed, this, &NewsChecker::rssDownloadFailed);
+	m_newsNetJob.reset(job);
+	job->start();
+}
+
+void NewsChecker::rssDownloadFinished()
+{
+	// Parse the XML file and process the RSS feed entries.
+	QLOG_DEBUG() << "Finished loading RSS feed.";
+
+	QByteArray data;
+	{
+		ByteArrayDownloadPtr dl = std::dynamic_pointer_cast<ByteArrayDownload>(m_newsNetJob->first());
+		data = dl->m_data;
+		m_newsNetJob.reset();
+	}
+
+	QDomDocument doc;
+	{
+		// Stuff to store error info in.
+		QString errorMsg = "Unknown error.";
+		int errorLine = -1;
+		int errorCol = -1;
+
+		// Parse the XML.
+		if (!doc.setContent(data, false, &errorMsg, &errorLine, &errorCol))
+		{
+			QString fullErrorMsg = QString("Error parsing RSS feed XML. %s at %d:%d.").arg(errorMsg, errorLine, errorCol);
+			fail(fullErrorMsg);
+			return;
+		}
+	}
+
+	// If the parsing succeeded, read it.
+	QDomNodeList items = doc.elementsByTagName("item");
+	m_newsEntries.clear();
+	for (int i = 0; i < items.length(); i++)
+	{
+		QDomElement element = items.at(i).toElement();
+		NewsEntryPtr entry;
+		entry.reset(new NewsEntry());
+		QString errorMsg = "An unknown error occurred.";
+		if (NewsEntry::fromXmlElement(element, entry.get(), &errorMsg))
+		{
+			QLOG_DEBUG() << "Loaded news entry" << entry->title;
+			m_newsEntries.append(entry);
+		}
+		else
+		{
+			QLOG_WARN() << "Failed to load news entry at index" << i << ":" << errorMsg;
+		}
+	}
+
+	succeed();
+}
+
+void NewsChecker::rssDownloadFailed()
+{
+	// Set an error message and fail.
+	fail("Failed to load news RSS feed.");
+}
+
+
+bool NewsChecker::isLoadingNews() const
+{
+	return m_newsNetJob.get() != nullptr;
+}
+
+QString NewsChecker::getLastLoadErrorMsg() const
+{
+	return m_lastLoadError;
+}
+
+void NewsChecker::succeed()
+{
+	m_lastLoadError = "";
+	QLOG_DEBUG() << "News loading succeeded.";
+	m_newsNetJob.reset();
+	emit newsLoaded();
+}
+
+void NewsChecker::fail(const QString& errorMsg)
+{
+	m_lastLoadError = errorMsg;
+	QLOG_DEBUG() << "Failed to load news:" << errorMsg;
+	m_newsNetJob.reset();
+	emit newsLoadingFailed(errorMsg);
+}
+