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/*
* vdr-vodcatcher - A plugin for the Linux Video Disk Recorder
* Copyright (c) 2007 - 2009 Tobias Grimm <vdr@e-tobi.net>
*
* 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; either version 2 of the License, or (at your option)
* any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "RssFeedParser.h"
#include "HtmlToText.h"
#include "Feed.h"
#include "IDownloadCache.h"
#include "tinyxml.h"
#include "Item.h"
using namespace std;
RssFeedParser::RssFeedParser(const IDownloadCache& downloadCache) :
_downloadCache(downloadCache)
{
}
bool RssFeedParser::Parse(Feed& feed) const
{
RefPtr<istream> source(_downloadCache.CreateStreamByUrl(feed.GetUrl()));
if (source.IsAssigned())
{
RefPtr<TiXmlDocument> rssDoc = CreateRssDocument(*source);
TiXmlHandle docHandle(rssDoc.get());
const TiXmlNode* channelNode = docHandle.FirstChild("rss").FirstChild("channel").Node();
if (channelNode)
{
feed.SetTitle(GetChildValue(*channelNode, "title"));
feed.SetTimeToLive(StringToIntDefault(GetChildValue(*channelNode, "ttl"), feed.GetTimeToLive()));
for (const TiXmlNode* itemNode = channelNode->FirstChild("item"); itemNode; itemNode
= itemNode->NextSibling("item"))
{
Item item = ParseItem(*itemNode);
feed.AddItem(item);
}
return true;
}
}
return false;
}
RefPtr<TiXmlDocument> RssFeedParser::CreateRssDocument(istream& rssStream) const
{
RefPtr<TiXmlDocument> rssDoc(new TiXmlDocument());
rssStream >> *rssDoc;
if (!rssDoc->Error())
{
return rssDoc;
}
return RefPtr<TiXmlDocument>();
}
string RssFeedParser::GetValue(const TiXmlNode& node) const
{
const TiXmlNode* textNode = node.FirstChild();
if (textNode)
{
return textNode->Value();
}
return "";
}
const string RssFeedParser::GetAttribute(const TiXmlElement& element, string name) const
{
const string* value = element.Attribute(name);
if (value != NULL)
{
return *value;
}
else
{
return "";
}
}
string RssFeedParser::GetChildValue(const TiXmlNode& root, const string& childName) const
{
const TiXmlNode* childNode = root.FirstChild(childName);
if (childNode)
{
return GetValue(*childNode);
}
return "";
}
Item RssFeedParser::ParseItem(const TiXmlNode& itemNode) const
{
string title = GetChildValue(itemNode, "title");
string description = GetChildValue(itemNode, "description");
string date = GetChildValue(itemNode, "pubDate");
Item item(title, Rfc822DateTime(date), HtmlToText::Convert(description));
const TiXmlElement* subFeedElement = itemNode.FirstChildElement("videocast:subfeed");
if (subFeedElement)
{
item.SetSubFeedUrl(GetAttribute(*subFeedElement, "url"));
}
const TiXmlElement* enclosureElement = itemNode.FirstChildElement("enclosure");
if (enclosureElement)
{
string type = GetAttribute(*enclosureElement, "type");
if (type.find("video/") == 0)
{
item.SetVideoCastStream(Low, GetAttribute(*enclosureElement, "url"));
}
}
const TiXmlElement* streamElement = itemNode.FirstChildElement("videocast:stream");
while (streamElement)
{
ParseStreamElement(*streamElement, item);
streamElement = streamElement->NextSiblingElement("videocast:stream");
}
const TiXmlElement* streamInfoElement = itemNode.FirstChildElement("videocast:streaminfo");
if (streamInfoElement)
{
item.SetStreamLength(GetAttribute(*streamInfoElement, "length"));
}
return item;
}
void RssFeedParser::ParseStreamElement(const TiXmlElement& streamElement, Item& item) const
{
string quality = GetAttribute(streamElement, "quality");
string url = GetAttribute(streamElement, "url");
if (quality == "high")
{
item.SetVideoCastStream(High, url);
}
else if (quality == "medium")
{
item.SetVideoCastStream(Medium, url);
}
else if (quality == "low")
{
item.SetVideoCastStream(Low, url);
}
}
int RssFeedParser::StringToIntDefault(const string& str, const int defaultValue) const
{
istringstream tempStream(str);
int value;
if (!(tempStream >> value))
{
value = defaultValue;
}
return value;
}
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