1 files changed, 297 insertions, 0 deletions
diff --git a/src/playlist/LastFMPlaylistPlugin.cxx b/src/playlist/LastFMPlaylistPlugin.cxx
new file mode 100644
index 00000000..49638840
--- /dev/null
+++ b/src/playlist/LastFMPlaylistPlugin.cxx
@@ -0,0 +1,297 @@
+/*
+ * 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 "LastFMPlaylistPlugin.hxx"
+#include "PlaylistPlugin.hxx"
+#include "PlaylistRegistry.hxx"
+#include "conf.h"
+#include "song.h"
+#include "input_stream.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+
+struct lastfm_playlist {
+	struct playlist_provider base;
+
+	struct input_stream *is;
+
+	struct playlist_provider *xspf;
+};
+
+static struct {
+	char *user;
+	char *md5;
+} lastfm_config;
+
+static bool
+lastfm_init(const struct config_param *param)
+{
+	const char *user = config_get_block_string(param, "user", NULL);
+	const char *passwd = config_get_block_string(param, "password", NULL);
+
+	if (user == NULL || passwd == NULL) {
+		g_debug("disabling the last.fm playlist plugin "
+			"because account is not configured");
+		return false;
+	}
+
+	lastfm_config.user = g_uri_escape_string(user, NULL, false);
+
+	if (strlen(passwd) != 32)
+		lastfm_config.md5 = g_compute_checksum_for_string(G_CHECKSUM_MD5,
+								  passwd, strlen(passwd));
+	else
+		lastfm_config.md5 = g_strdup(passwd);
+
+	return true;
+}
+
+static void
+lastfm_finish(void)
+{
+	g_free(lastfm_config.user);
+	g_free(lastfm_config.md5);
+}
+
+/**
+ * Simple data fetcher.
+ * @param url path or url of data to fetch.
+ * @return data fetched, or NULL on error. Must be freed with g_free.
+ */
+static char *
+lastfm_get(const char *url, Mutex &mutex, Cond &cond)
+{
+	struct input_stream *input_stream;
+	GError *error = NULL;
+	char buffer[4096];
+	size_t length = 0, nbytes;
+
+	input_stream = input_stream_open(url, mutex, cond, &error);
+	if (input_stream == NULL) {
+		if (error != NULL) {
+			g_warning("%s", error->message);
+			g_error_free(error);
+		}
+
+		return NULL;
+	}
+
+	mutex.lock();
+
+	input_stream_wait_ready(input_stream);
+
+	do {
+		nbytes = input_stream_read(input_stream, buffer + length,
+					   sizeof(buffer) - length, &error);
+		if (nbytes == 0) {
+			if (error != NULL) {
+				g_warning("%s", error->message);
+				g_error_free(error);
+			}
+
+			if (input_stream_eof(input_stream))
+				break;
+
+			/* I/O error */
+			mutex.unlock();
+			input_stream_close(input_stream);
+			return NULL;
+		}
+
+		length += nbytes;
+	} while (length < sizeof(buffer));
+
+	mutex.unlock();
+
+	input_stream_close(input_stream);
+	return g_strndup(buffer, length);
+}
+
+/**
+ * Ini-style value fetcher.
+ * @param response data through which to search.
+ * @param name name of value to search for.
+ * @return value for param name in param response or NULL on error. Free with g_free.
+ */
+static char *
+lastfm_find(const char *response, const char *name)
+{
+	size_t name_length = strlen(name);
+
+	while (true) {
+		const char *eol = strchr(response, '\n');
+		if (eol == NULL)
+			return NULL;
+
+		if (strncmp(response, name, name_length) == 0 &&
+		    response[name_length] == '=') {
+			response += name_length + 1;
+			return g_strndup(response, eol - response);
+		}
+
+		response = eol + 1;
+	}
+}
+
+static struct playlist_provider *
+lastfm_open_uri(const char *uri, Mutex &mutex, Cond &cond)
+{
+	struct lastfm_playlist *playlist;
+	GError *error = NULL;
+	char *p, *q, *response, *session;
+
+	/* handshake */
+
+	p = g_strconcat("http://ws.audioscrobbler.com/radio/handshake.php?"
+			"version=1.1.1&platform=linux&"
+			"username=", lastfm_config.user, "&"
+			"passwordmd5=", lastfm_config.md5, "&"
+			"debug=0&partner=", NULL);
+	response = lastfm_get(p, mutex, cond);
+	g_free(p);
+	if (response == NULL)
+		return NULL;
+
+	/* extract session id from response */
+
+	session = lastfm_find(response, "session");
+	g_free(response);
+	if (session == NULL) {
+		g_warning("last.fm handshake failed");
+		return NULL;
+	}
+
+	q = g_uri_escape_string(session, NULL, false);
+	g_free(session);
+	session = q;
+
+	g_debug("session='%s'", session);
+
+	/* "adjust" last.fm radio */
+
+	if (strlen(uri) > 9) {
+		char *escaped_uri;
+
+		escaped_uri = g_uri_escape_string(uri, NULL, false);
+
+		p = g_strconcat("http://ws.audioscrobbler.com/radio/adjust.php?"
+				"session=", session, "&url=", escaped_uri, "&debug=0",
+				NULL);
+		g_free(escaped_uri);
+
+		response = lastfm_get(p, mutex, cond);
+		g_free(response);
+		g_free(p);
+
+		if (response == NULL) {
+			g_free(session);
+			return NULL;
+		}
+	}
+
+	/* create the playlist object */
+
+	playlist = g_new(struct lastfm_playlist, 1);
+	playlist_provider_init(&playlist->base, &lastfm_playlist_plugin);
+
+	/* open the last.fm playlist */
+
+	p = g_strconcat("http://ws.audioscrobbler.com/radio/xspf.php?"
+			"sk=", session, "&discovery=0&desktop=1.5.1.31879",
+			NULL);
+	g_free(session);
+
+	playlist->is = input_stream_open(p, mutex, cond, &error);
+	g_free(p);
+
+	if (playlist->is == NULL) {
+		if (error != NULL) {
+			g_warning("Failed to load XSPF playlist: %s",
+				  error->message);
+			g_error_free(error);
+		} else
+			g_warning("Failed to load XSPF playlist");
+		g_free(playlist);
+		return NULL;
+	}
+
+	mutex.lock();
+
+	input_stream_wait_ready(playlist->is);
+
+	/* last.fm does not send a MIME type, we have to fake it here
+	   :-( */
+	input_stream_override_mime_type(playlist->is, "application/xspf+xml");
+
+	mutex.unlock();
+
+	/* parse the XSPF playlist */
+
+	playlist->xspf = playlist_list_open_stream(playlist->is, NULL);
+	if (playlist->xspf == NULL) {
+		input_stream_close(playlist->is);
+		g_free(playlist);
+		g_warning("Failed to parse XSPF playlist");
+		return NULL;
+	}
+
+	return &playlist->base;
+}
+
+static void
+lastfm_close(struct playlist_provider *_playlist)
+{
+	struct lastfm_playlist *playlist = (struct lastfm_playlist *)_playlist;
+
+	playlist_plugin_close(playlist->xspf);
+	input_stream_close(playlist->is);
+	g_free(playlist);
+}
+
+static struct song *
+lastfm_read(struct playlist_provider *_playlist)
+{
+	struct lastfm_playlist *playlist = (struct lastfm_playlist *)_playlist;
+
+	return playlist_plugin_read(playlist->xspf);
+}
+
+static const char *const lastfm_schemes[] = {
+	"lastfm",
+	NULL
+};
+
+const struct playlist_plugin lastfm_playlist_plugin = {
+	"lastfm",
+
+	lastfm_init,
+	lastfm_finish,
+	lastfm_open_uri,
+	nullptr,
+	lastfm_close,
+	lastfm_read,
+
+	lastfm_schemes,
+	nullptr,
+	nullptr,
+};