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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 "RssPlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../MemorySongEnumerator.hxx"
#include "tag/Builder.hxx"
#include "util/ASCII.hxx"
#include "util/StringView.hxx"
#include "lib/expat/ExpatParser.hxx"
/**
* This is the state object for the our XML parser.
*/
struct RssParser {
/**
* The list of songs (in reverse order because that's faster
* while adding).
*/
std::forward_list<DetachedSong> songs;
/**
* The current position in the XML file.
*/
enum {
ROOT, ITEM,
} state{ROOT};
/**
* The current tag within the "entry" element. This is only
* valid if state==ITEM. TAG_NUM_OF_ITEM_TYPES means there
* is no (known) tag.
*/
TagType tag_type;
/**
* The current song URI. It is set by the "enclosure"
* element.
*/
std::string location;
TagBuilder tag_builder;
RssParser() = default;
};
static void XMLCALL
rss_start_element(void *user_data, const XML_Char *element_name,
const XML_Char **atts)
{
auto *parser = (RssParser *)user_data;
switch (parser->state) {
case RssParser::ROOT:
if (StringEqualsCaseASCII(element_name, "item")) {
parser->state = RssParser::ITEM;
parser->location.clear();
parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
}
break;
case RssParser::ITEM:
if (StringEqualsCaseASCII(element_name, "enclosure")) {
const char *href =
ExpatParser::GetAttributeCase(atts, "url");
if (href != nullptr)
parser->location = href;
} else if (StringEqualsCaseASCII(element_name, "title"))
parser->tag_type = TAG_TITLE;
else if (StringEqualsCaseASCII(element_name, "itunes:author"))
parser->tag_type = TAG_ARTIST;
break;
}
}
static void XMLCALL
rss_end_element(void *user_data, const XML_Char *element_name)
{
auto *parser = (RssParser *)user_data;
switch (parser->state) {
case RssParser::ROOT:
break;
case RssParser::ITEM:
if (StringEqualsCaseASCII(element_name, "item")) {
if (!parser->location.empty())
parser->songs.emplace_front(std::move(parser->location),
parser->tag_builder.Commit());
parser->state = RssParser::ROOT;
} else
parser->tag_type = TAG_NUM_OF_ITEM_TYPES;
break;
}
}
static void XMLCALL
rss_char_data(void *user_data, const XML_Char *s, int len)
{
auto *parser = (RssParser *)user_data;
switch (parser->state) {
case RssParser::ROOT:
break;
case RssParser::ITEM:
if (parser->tag_type != TAG_NUM_OF_ITEM_TYPES)
parser->tag_builder.AddItem(parser->tag_type,
StringView(s, len));
break;
}
}
/*
* The playlist object
*
*/
static std::unique_ptr<SongEnumerator>
rss_open_stream(InputStreamPtr &&is)
{
RssParser parser;
{
ExpatParser expat(&parser);
expat.SetElementHandler(rss_start_element, rss_end_element);
expat.SetCharacterDataHandler(rss_char_data);
expat.Parse(*is);
}
parser.songs.reverse();
return std::make_unique<MemorySongEnumerator>(std::move(parser.songs));
}
static constexpr const char *rss_suffixes[] = {
"rss",
nullptr
};
static constexpr const char *rss_mime_types[] = {
"application/rss+xml",
"application/xml",
"text/xml",
nullptr
};
const PlaylistPlugin rss_playlist_plugin =
PlaylistPlugin("rss", rss_open_stream)
.WithSuffixes(rss_suffixes)
.WithMimeTypes(rss_mime_types);
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