playlist/rss: new playlist plugin for RSS feeds
This commit is contained in:
Max Kellermann
parent
a57f9e712d
commit
188e1b440e
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@ -173,6 +173,7 @@ mpd_headers = \
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src/playlist/pls_playlist_plugin.h \
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src/playlist/xspf_playlist_plugin.h \
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src/playlist/asx_playlist_plugin.h \
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src/playlist/rss_playlist_plugin.h \
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src/playlist/lastfm_playlist_plugin.h \
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src/playlist/cue_playlist_plugin.h \
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src/playlist/flac_playlist_plugin.h \
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@ -753,6 +754,7 @@ PLAYLIST_SRC = \
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src/playlist/pls_playlist_plugin.c \
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src/playlist/xspf_playlist_plugin.c \
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src/playlist/asx_playlist_plugin.c \
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src/playlist/rss_playlist_plugin.c \
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src/playlist_list.c
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if ENABLE_LASTFM
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@ -0,0 +1,321 @@
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/*
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* Copyright (C) 2003-2010 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "playlist/rss_playlist_plugin.h"
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#include "playlist_plugin.h"
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#include "input_stream.h"
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#include "song.h"
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#include "tag.h"
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#include <glib.h>
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#include <assert.h>
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#include <string.h>
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "rss"
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/**
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* This is the state object for the GLib XML parser.
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*/
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struct rss_parser {
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/**
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* The list of songs (in reverse order because that's faster
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* while adding).
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*/
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GSList *songs;
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/**
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* The current position in the XML file.
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*/
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enum {
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ROOT, ITEM,
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} state;
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/**
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* The current tag within the "entry" element. This is only
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* valid if state==ITEM. TAG_NUM_OF_ITEM_TYPES means there
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* is no (known) tag.
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*/
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enum tag_type tag;
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/**
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* The current song. It is allocated after the "location"
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* element.
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*/
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struct song *song;
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};
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static const gchar *
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get_attribute(const gchar **attribute_names, const gchar **attribute_values,
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const gchar *name)
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{
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for (unsigned i = 0; attribute_names[i] != NULL; ++i)
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if (g_ascii_strcasecmp(attribute_names[i], name) == 0)
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return attribute_values[i];
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return NULL;
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}
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static void
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rss_start_element(G_GNUC_UNUSED GMarkupParseContext *context,
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const gchar *element_name,
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const gchar **attribute_names,
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const gchar **attribute_values,
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gpointer user_data, G_GNUC_UNUSED GError **error)
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{
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struct rss_parser *parser = user_data;
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switch (parser->state) {
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case ROOT:
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if (g_ascii_strcasecmp(element_name, "item") == 0) {
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parser->state = ITEM;
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parser->song = song_remote_new("rss:");
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parser->tag = TAG_NUM_OF_ITEM_TYPES;
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}
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break;
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case ITEM:
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if (g_ascii_strcasecmp(element_name, "enclosure") == 0) {
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const gchar *href = get_attribute(attribute_names,
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attribute_values,
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"url");
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if (href != NULL) {
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/* create new song object, and copy
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the existing tag over; we cannot
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replace the existing song's URI,
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because that attribute is
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immutable */
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struct song *song = song_remote_new(href);
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if (parser->song != NULL) {
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song->tag = parser->song->tag;
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parser->song->tag = NULL;
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song_free(parser->song);
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}
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parser->song = song;
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}
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} else if (g_ascii_strcasecmp(element_name, "title") == 0)
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parser->tag = TAG_TITLE;
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else if (g_ascii_strcasecmp(element_name, "itunes:author") == 0)
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parser->tag = TAG_ARTIST;
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break;
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}
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}
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static void
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rss_end_element(G_GNUC_UNUSED GMarkupParseContext *context,
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const gchar *element_name,
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gpointer user_data, G_GNUC_UNUSED GError **error)
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{
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struct rss_parser *parser = user_data;
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switch (parser->state) {
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case ROOT:
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break;
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case ITEM:
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if (g_ascii_strcasecmp(element_name, "item") == 0) {
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if (strcmp(parser->song->uri, "rss:") != 0)
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parser->songs = g_slist_prepend(parser->songs,
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parser->song);
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else
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song_free(parser->song);
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parser->state = ROOT;
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} else
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parser->tag = TAG_NUM_OF_ITEM_TYPES;
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break;
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}
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}
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static void
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rss_text(G_GNUC_UNUSED GMarkupParseContext *context,
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const gchar *text, gsize text_len,
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gpointer user_data, G_GNUC_UNUSED GError **error)
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{
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struct rss_parser *parser = user_data;
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switch (parser->state) {
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case ROOT:
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break;
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case ITEM:
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if (parser->tag != TAG_NUM_OF_ITEM_TYPES) {
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if (parser->song->tag == NULL)
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parser->song->tag = tag_new();
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tag_add_item_n(parser->song->tag, parser->tag,
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text, text_len);
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}
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break;
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}
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}
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static const GMarkupParser rss_parser = {
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.start_element = rss_start_element,
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.end_element = rss_end_element,
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.text = rss_text,
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};
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static void
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song_free_callback(gpointer data, G_GNUC_UNUSED gpointer user_data)
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{
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struct song *song = data;
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song_free(song);
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}
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static void
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rss_parser_destroy(gpointer data)
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{
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struct rss_parser *parser = data;
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if (parser->state >= ITEM)
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song_free(parser->song);
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g_slist_foreach(parser->songs, song_free_callback, NULL);
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g_slist_free(parser->songs);
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}
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/*
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* The playlist object
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*
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*/
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struct rss_playlist {
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struct playlist_provider base;
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GSList *songs;
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};
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static struct playlist_provider *
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rss_open_stream(struct input_stream *is)
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{
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struct rss_parser parser = {
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.songs = NULL,
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.state = ROOT,
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};
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struct rss_playlist *playlist;
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GMarkupParseContext *context;
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char buffer[1024];
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size_t nbytes;
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bool success;
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GError *error = NULL;
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/* parse the RSS XML file */
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context = g_markup_parse_context_new(&rss_parser,
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G_MARKUP_TREAT_CDATA_AS_TEXT,
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&parser, rss_parser_destroy);
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while (true) {
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nbytes = input_stream_read(is, buffer, sizeof(buffer), &error);
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if (nbytes == 0) {
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if (error != NULL) {
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g_markup_parse_context_free(context);
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g_warning("%s", error->message);
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g_error_free(error);
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return NULL;
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}
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break;
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}
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success = g_markup_parse_context_parse(context, buffer, nbytes,
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&error);
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if (!success) {
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g_warning("XML parser failed: %s", error->message);
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g_error_free(error);
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g_markup_parse_context_free(context);
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return NULL;
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}
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}
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success = g_markup_parse_context_end_parse(context, &error);
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if (!success) {
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g_warning("XML parser failed: %s", error->message);
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g_error_free(error);
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g_markup_parse_context_free(context);
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return NULL;
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}
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/* create a #rss_playlist object from the parsed song list */
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playlist = g_new(struct rss_playlist, 1);
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playlist_provider_init(&playlist->base, &rss_playlist_plugin);
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playlist->songs = g_slist_reverse(parser.songs);
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parser.songs = NULL;
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g_markup_parse_context_free(context);
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return &playlist->base;
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}
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static void
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rss_close(struct playlist_provider *_playlist)
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{
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struct rss_playlist *playlist = (struct rss_playlist *)_playlist;
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g_slist_foreach(playlist->songs, song_free_callback, NULL);
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g_slist_free(playlist->songs);
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g_free(playlist);
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}
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static struct song *
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rss_read(struct playlist_provider *_playlist)
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{
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struct rss_playlist *playlist = (struct rss_playlist *)_playlist;
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struct song *song;
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if (playlist->songs == NULL)
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return NULL;
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song = playlist->songs->data;
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playlist->songs = g_slist_remove(playlist->songs, song);
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return song;
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}
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static const char *const rss_suffixes[] = {
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"rss",
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NULL
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};
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static const char *const rss_mime_types[] = {
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"application/rss+xml",
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"text/xml",
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NULL
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};
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const struct playlist_plugin rss_playlist_plugin = {
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.name = "rss",
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.open_stream = rss_open_stream,
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.close = rss_close,
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.read = rss_read,
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.suffixes = rss_suffixes,
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.mime_types = rss_mime_types,
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};
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@ -0,0 +1,25 @@
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/*
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* Copyright (C) 2003-2010 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_PLAYLIST_RSS_PLAYLIST_PLUGIN_H
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#define MPD_PLAYLIST_RSS_PLAYLIST_PLUGIN_H
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extern const struct playlist_plugin rss_playlist_plugin;
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#endif
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@ -26,6 +26,7 @@
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#include "playlist/lastfm_playlist_plugin.h"
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#include "playlist/pls_playlist_plugin.h"
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#include "playlist/asx_playlist_plugin.h"
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#include "playlist/rss_playlist_plugin.h"
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#include "playlist/cue_playlist_plugin.h"
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#include "playlist/flac_playlist_plugin.h"
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#include "input_stream.h"
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@ -45,6 +46,7 @@ static const struct playlist_plugin *const playlist_plugins[] = {
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&xspf_playlist_plugin,
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&pls_playlist_plugin,
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&asx_playlist_plugin,
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&rss_playlist_plugin,
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#ifdef ENABLE_LASTFM
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&lastfm_playlist_plugin,
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#endif
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