/* * Copyright (C) 2003-2013 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 "config.h" #include "RssPlaylistPlugin.hxx" #include "MemoryPlaylistProvider.hxx" #include "InputStream.hxx" #include "Song.hxx" #include "Tag.hxx" #include "util/Error.hxx" #include #include #include #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "rss" /** * This is the state object for the GLib XML parser. */ struct RssParser { /** * The list of songs (in reverse order because that's faster * while adding). */ std::forward_list songs; /** * The current position in the XML file. */ enum { ROOT, ITEM, } state; /** * 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. */ enum tag_type tag; /** * The current song. It is allocated after the "location" * element. */ Song *song; RssParser() :state(ROOT) {} }; static const gchar * get_attribute(const gchar **attribute_names, const gchar **attribute_values, const gchar *name) { for (unsigned i = 0; attribute_names[i] != NULL; ++i) if (g_ascii_strcasecmp(attribute_names[i], name) == 0) return attribute_values[i]; return NULL; } static void rss_start_element(gcc_unused GMarkupParseContext *context, const gchar *element_name, const gchar **attribute_names, const gchar **attribute_values, gpointer user_data, gcc_unused GError **error) { RssParser *parser = (RssParser *)user_data; switch (parser->state) { case RssParser::ROOT: if (g_ascii_strcasecmp(element_name, "item") == 0) { parser->state = RssParser::ITEM; parser->song = Song::NewRemote("rss:"); parser->tag = TAG_NUM_OF_ITEM_TYPES; } break; case RssParser::ITEM: if (g_ascii_strcasecmp(element_name, "enclosure") == 0) { const gchar *href = get_attribute(attribute_names, attribute_values, "url"); if (href != NULL) { /* create new song object, and copy the existing tag over; we cannot replace the existing song's URI, because that attribute is immutable */ Song *song = Song::NewRemote(href); if (parser->song != NULL) { song->tag = parser->song->tag; parser->song->tag = NULL; parser->song->Free(); } parser->song = song; } } else if (g_ascii_strcasecmp(element_name, "title") == 0) parser->tag = TAG_TITLE; else if (g_ascii_strcasecmp(element_name, "itunes:author") == 0) parser->tag = TAG_ARTIST; break; } } static void rss_end_element(gcc_unused GMarkupParseContext *context, const gchar *element_name, gpointer user_data, gcc_unused GError **error) { RssParser *parser = (RssParser *)user_data; switch (parser->state) { case RssParser::ROOT: break; case RssParser::ITEM: if (g_ascii_strcasecmp(element_name, "item") == 0) { if (strcmp(parser->song->uri, "rss:") != 0) parser->songs.emplace_front(parser->song); else parser->song->Free(); parser->state = RssParser::ROOT; } else parser->tag = TAG_NUM_OF_ITEM_TYPES; break; } } static void rss_text(gcc_unused GMarkupParseContext *context, const gchar *text, gsize text_len, gpointer user_data, gcc_unused GError **error) { RssParser *parser = (RssParser *)user_data; switch (parser->state) { case RssParser::ROOT: break; case RssParser::ITEM: if (parser->tag != TAG_NUM_OF_ITEM_TYPES) { if (parser->song->tag == NULL) parser->song->tag = new Tag(); parser->song->tag->AddItem(parser->tag, text, text_len); } break; } } static const GMarkupParser rss_parser = { rss_start_element, rss_end_element, rss_text, nullptr, nullptr, }; static void rss_parser_destroy(gpointer data) { RssParser *parser = (RssParser *)data; if (parser->state >= RssParser::ITEM) parser->song->Free(); } /* * The playlist object * */ static struct playlist_provider * rss_open_stream(struct input_stream *is) { RssParser parser; GMarkupParseContext *context; char buffer[1024]; size_t nbytes; bool success; Error error2; GError *error = NULL; /* parse the RSS XML file */ context = g_markup_parse_context_new(&rss_parser, G_MARKUP_TREAT_CDATA_AS_TEXT, &parser, rss_parser_destroy); while (true) { nbytes = is->LockRead(buffer, sizeof(buffer), error2); if (nbytes == 0) { if (error2.IsDefined()) { g_markup_parse_context_free(context); g_warning("%s", error2.GetMessage()); return NULL; } break; } success = g_markup_parse_context_parse(context, buffer, nbytes, &error); if (!success) { g_warning("XML parser failed: %s", error->message); g_error_free(error); g_markup_parse_context_free(context); return NULL; } } success = g_markup_parse_context_end_parse(context, &error); if (!success) { g_warning("XML parser failed: %s", error->message); g_error_free(error); g_markup_parse_context_free(context); return NULL; } parser.songs.reverse(); MemoryPlaylistProvider *playlist = new MemoryPlaylistProvider(std::move(parser.songs)); g_markup_parse_context_free(context); return playlist; } static const char *const rss_suffixes[] = { "rss", NULL }; static const char *const rss_mime_types[] = { "application/rss+xml", "text/xml", NULL }; const struct playlist_plugin rss_playlist_plugin = { "rss", nullptr, nullptr, nullptr, rss_open_stream, nullptr, nullptr, nullptr, rss_suffixes, rss_mime_types, };