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-rw-r--r--src/playlist/RssPlaylistPlugin.cxx281
1 files changed, 281 insertions, 0 deletions
diff --git a/src/playlist/RssPlaylistPlugin.cxx b/src/playlist/RssPlaylistPlugin.cxx
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index 000000000..3b69202e6
--- /dev/null
+++ b/src/playlist/RssPlaylistPlugin.cxx
@@ -0,0 +1,281 @@
+/*
+ * 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 "input_stream.h"
+#include "song.h"
+#include "tag.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+#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<SongPointer> 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.
+ */
+ struct 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(G_GNUC_UNUSED GMarkupParseContext *context,
+ const gchar *element_name,
+ const gchar **attribute_names,
+ const gchar **attribute_values,
+ gpointer user_data, G_GNUC_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_remote_new("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 */
+ struct song *song = song_remote_new(href);
+
+ if (parser->song != NULL) {
+ song->tag = parser->song->tag;
+ parser->song->tag = NULL;
+ song_free(parser->song);
+ }
+
+ 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(G_GNUC_UNUSED GMarkupParseContext *context,
+ const gchar *element_name,
+ gpointer user_data, G_GNUC_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
+ song_free(parser->song);
+
+ parser->state = RssParser::ROOT;
+ } else
+ parser->tag = TAG_NUM_OF_ITEM_TYPES;
+
+ break;
+ }
+}
+
+static void
+rss_text(G_GNUC_UNUSED GMarkupParseContext *context,
+ const gchar *text, gsize text_len,
+ gpointer user_data, G_GNUC_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 = tag_new();
+ tag_add_item_n(parser->song->tag, 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)
+ song_free(parser->song);
+}
+
+/*
+ * 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;
+ 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 = input_stream_lock_read(is, buffer, sizeof(buffer),
+ &error);
+ if (nbytes == 0) {
+ if (error != NULL) {
+ g_markup_parse_context_free(context);
+ g_warning("%s", error->message);
+ g_error_free(error);
+ 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,
+};