f122e6d456
This plugin will replace the last.fm input plugin, once the playlist API is integrated into MPD.
301 lines
6.7 KiB
C
301 lines
6.7 KiB
C
/*
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* Copyright (C) 2003-2009 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 "playlist/lastfm_playlist_plugin.h"
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#include "playlist_plugin.h"
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#include "playlist_list.h"
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#include "conf.h"
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#include "uri.h"
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#include "song.h"
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#include "input_stream.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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struct lastfm_playlist {
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struct playlist_provider base;
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struct input_stream is;
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struct playlist_provider *xspf;
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};
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static struct {
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char *user;
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char *md5;
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} lastfm_config;
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static bool
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lastfm_init(const struct config_param *param)
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{
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const char *user = config_get_block_string(param, "user", NULL);
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const char *passwd = config_get_block_string(param, "password", NULL);
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if (user == NULL || passwd == NULL) {
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g_debug("disabling the last.fm playlist plugin "
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"because account is not configured");
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return false;
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}
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#if GLIB_CHECK_VERSION(2,16,0)
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lastfm_config.user = g_uri_escape_string(user, NULL, false);
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#else
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lastfm_config.user = g_strdup(user);
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#endif
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#if GLIB_CHECK_VERSION(2,16,0)
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if (strlen(passwd) != 32)
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lastfm_config.md5 = g_compute_checksum_for_string(G_CHECKSUM_MD5,
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passwd, strlen(passwd));
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else
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#endif
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lastfm_config.md5 = g_strdup(passwd);
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return true;
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}
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static void
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lastfm_finish(void)
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{
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g_free(lastfm_config.user);
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g_free(lastfm_config.md5);
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}
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/**
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* Simple data fetcher.
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* @param url path or url of data to fetch.
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* @return data fetched, or NULL on error. Must be freed with g_free.
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*/
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static char *
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lastfm_get(const char *url)
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{
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struct input_stream input_stream;
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bool success;
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int ret;
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char buffer[4096];
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size_t length = 0, nbytes;
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success = input_stream_open(&input_stream, url);
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if (!success)
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return NULL;
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while (!input_stream.ready) {
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ret = input_stream_buffer(&input_stream);
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if (ret < 0) {
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input_stream_close(&input_stream);
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return NULL;
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}
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}
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do {
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nbytes = input_stream_read(&input_stream, buffer + length,
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sizeof(buffer) - length);
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if (nbytes == 0) {
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if (input_stream_eof(&input_stream))
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break;
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/* I/O error */
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input_stream_close(&input_stream);
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return NULL;
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}
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length += nbytes;
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} while (length < sizeof(buffer));
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input_stream_close(&input_stream);
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return g_strndup(buffer, length);
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}
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/**
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* Ini-style value fetcher.
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* @param response data through which to search.
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* @param name name of value to search for.
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* @return value for param name in param reponse or NULL on error. Free with g_free.
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*/
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static char *
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lastfm_find(const char *response, const char *name)
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{
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size_t name_length = strlen(name);
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while (true) {
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const char *eol = strchr(response, '\n');
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if (eol == NULL)
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return NULL;
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if (strncmp(response, name, name_length) == 0 &&
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response[name_length] == '=') {
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response += name_length + 1;
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return g_strndup(response, eol - response);
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}
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response = eol + 1;
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}
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}
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static struct playlist_provider *
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lastfm_open_uri(const char *uri)
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{
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struct lastfm_playlist *playlist;
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char *p, *q, *response, *session;
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bool success;
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/* handshake */
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p = g_strconcat("http://ws.audioscrobbler.com/radio/handshake.php?"
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"version=1.1.1&platform=linux&"
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"username=", lastfm_config.user, "&"
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"passwordmd5=", lastfm_config.md5, "&"
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"debug=0&partner=", NULL);
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response = lastfm_get(p);
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g_free(p);
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if (response == NULL)
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return NULL;
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/* extract session id from response */
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session = lastfm_find(response, "session");
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g_free(response);
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if (session == NULL) {
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g_warning("last.fm handshake failed");
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return NULL;
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}
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#if GLIB_CHECK_VERSION(2,16,0)
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q = g_uri_escape_string(session, NULL, false);
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g_free(session);
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session = q;
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#endif
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g_debug("session='%s'", session);
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/* "adjust" last.fm radio */
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if (strlen(uri) > 9) {
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char *escaped_uri;
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#if GLIB_CHECK_VERSION(2,16,0)
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escaped_uri = g_uri_escape_string(uri, NULL, false);
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#else
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escaped_uri = g_strdup(uri);
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#endif
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p = g_strconcat("http://ws.audioscrobbler.com/radio/adjust.php?"
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"session=", session, "&url=", escaped_uri, "&debug=0",
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NULL);
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g_free(escaped_uri);
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response = lastfm_get(p);
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g_free(response);
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g_free(p);
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if (response == NULL) {
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g_free(session);
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return NULL;
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}
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}
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/* create the playlist object */
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playlist = g_new(struct lastfm_playlist, 1);
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playlist_provider_init(&playlist->base, &lastfm_playlist_plugin);
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/* open the last.fm playlist */
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p = g_strconcat("http://ws.audioscrobbler.com/radio/xspf.php?"
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"sk=", session, "&discovery=0&desktop=1.5.1.31879",
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NULL);
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g_free(session);
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success = input_stream_open(&playlist->is, p);
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g_free(p);
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if (!success) {
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g_warning("Failed to load XSPF playlist");
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g_free(playlist);
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return NULL;
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}
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while (!playlist->is.ready) {
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int ret = input_stream_buffer(&playlist->is);
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if (ret < 0) {
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input_stream_close(&playlist->is);
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g_free(playlist);
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return NULL;
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}
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if (ret == 0)
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/* nothing was buffered - wait */
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g_usleep(10000);
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}
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/* last.fm does not send a MIME type, we have to fake it here
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:-( */
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g_free(playlist->is.mime);
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playlist->is.mime = g_strdup("application/xspf+xml");
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/* parse the XSPF playlist */
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playlist->xspf = playlist_list_open_stream(&playlist->is, NULL);
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if (playlist->xspf == NULL) {
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input_stream_close(&playlist->is);
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g_free(playlist);
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g_warning("Failed to parse XSPF playlist");
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return NULL;
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}
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return &playlist->base;
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}
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static void
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lastfm_close(struct playlist_provider *_playlist)
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{
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struct lastfm_playlist *playlist = (struct lastfm_playlist *)_playlist;
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playlist_plugin_close(playlist->xspf);
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input_stream_close(&playlist->is);
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g_free(playlist);
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}
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static struct song *
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lastfm_read(struct playlist_provider *_playlist)
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{
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struct lastfm_playlist *playlist = (struct lastfm_playlist *)_playlist;
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return playlist_plugin_read(playlist->xspf);
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}
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static const char *const lastfm_schemes[] = {
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"lastfm",
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NULL
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};
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const struct playlist_plugin lastfm_playlist_plugin = {
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.name = "lastfm",
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.init = lastfm_init,
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.finish = lastfm_finish,
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.open_uri = lastfm_open_uri,
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.close = lastfm_close,
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.read = lastfm_read,
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.schemes = lastfm_schemes,
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};
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