From 4220e6b0adccf2f09a82fb85768b7aecc5744b6c Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 2 Mar 2009 23:11:31 +0100
Subject: [PATCH] input_lastfm: new input plugin for last.fm radio
The lastfm input plugin enables MPD to play lastfm:// URLs. This
plugin is not complete yet: it plays only the first song in the
last.fm playlist, and the playlist parser isn't even implemented
properly.
---
Makefile.am | 5 +
NEWS | 1 +
configure.ac | 14 ++
src/input/lastfm_input_plugin.c | 228 ++++++++++++++++++++++++++++++++
src/input/lastfm_input_plugin.h | 24 ++++
src/input_stream.c | 5 +
src/ls.c | 3 +
7 files changed, 280 insertions(+)
create mode 100644 src/input/lastfm_input_plugin.c
create mode 100644 src/input/lastfm_input_plugin.h
diff --git a/Makefile.am b/Makefile.am
index c0941967a..da0b87103 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -71,6 +71,7 @@ mpd_headers = \
src/input_stream.h \
src/input/file_input_plugin.h \
src/input/curl_input_plugin.h \
+ src/input/lastfm_input_plugin.h \
src/input/mms_input_plugin.h \
src/icy_metadata.h \
src/client.h \
@@ -414,6 +415,10 @@ if HAVE_CURL
INPUT_SRC += src/input/curl_input_plugin.c src/icy_metadata.c
endif
+if ENABLE_LASTFM
+INPUT_SRC += src/input/lastfm_input_plugin.c
+endif
+
if ENABLE_MMS
INPUT_SRC += src/input/mms_input_plugin.c
endif
diff --git a/NEWS b/NEWS
index c90e3e82a..84b5e6af4 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@ ver 0.15 - (200?/??/??)
- parse Icy-Metadata
- added support for the MMS protocol
- hide HTTP password in playlist
+ - lastfm: new input plugin for last.fm radio
* tags:
- support the "album artist" tag
- support MusicBrainz tags
diff --git a/configure.ac b/configure.ac
index 5f5f70a10..1e1669085 100644
--- a/configure.ac
+++ b/configure.ac
@@ -253,6 +253,20 @@ if test x$enable_curl = xyes; then
fi
AM_CONDITIONAL(HAVE_CURL, test x$enable_curl = xyes)
+AC_ARG_ENABLE(lastfm,
+ AS_HELP_STRING([--enable-lastfm],
+ [enable support for last.fm radio (default: disable)]),,
+ [enable_lastfm=no])
+
+if test x$enable_lastfm = xyes; then
+ if test x$enable_curl != xyes; then
+ AC_MSG_ERROR([Cannot enable last.fm radio without curl])
+ fi
+
+ AC_DEFINE(ENABLE_LASTFM, 1, [Define when last.fm radio is enabled]),
+fi
+AM_CONDITIONAL(ENABLE_LASTFM, test x$enable_lastfm = xyes)
+
AC_ARG_ENABLE(mms,
AS_HELP_STRING([--enable-mms],
[enable the MMS protocol with libmms (default: disable)]),,
diff --git a/src/input/lastfm_input_plugin.c b/src/input/lastfm_input_plugin.c
new file mode 100644
index 000000000..2e592a9c8
--- /dev/null
+++ b/src/input/lastfm_input_plugin.c
@@ -0,0 +1,228 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2008 Max Kellermann <max@duempel.org>
+ * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "input/lastfm_input_plugin.h"
+#include "input/curl_input_plugin.h"
+#include "input_plugin.h"
+#include "conf.h"
+
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "input_lastfm"
+
+static const char *lastfm_user, *lastfm_password;
+
+static bool
+lastfm_input_init(const struct config_param *param)
+{
+ lastfm_user = config_get_block_string(param, "user", NULL);
+ lastfm_password = config_get_block_string(param, "password", NULL);
+
+ return lastfm_user != NULL && lastfm_password != NULL;
+}
+
+static char *
+lastfm_get(const char *url)
+{
+ struct input_stream input_stream;
+ bool success;
+ int ret;
+ char buffer[4096];
+ size_t length = 0, nbytes;
+
+ success = input_stream_open(&input_stream, url);
+ if (!success)
+ return NULL;
+
+ while (!input_stream.ready) {
+ ret = input_stream_buffer(&input_stream);
+ if (ret < 0) {
+ input_stream_close(&input_stream);
+ return NULL;
+ }
+ }
+
+ do {
+ nbytes = input_stream_read(&input_stream, buffer + length,
+ sizeof(buffer) - length);
+ if (nbytes == 0) {
+ if (input_stream_eof(&input_stream))
+ break;
+
+ /* I/O error */
+ input_stream_close(&input_stream);
+ return NULL;
+ }
+
+ length += nbytes;
+ } while (length < sizeof(buffer));
+
+ input_stream_close(&input_stream);
+ return g_strndup(buffer, length);
+}
+
+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 bool
+lastfm_input_open(struct input_stream *is, const char *url)
+{
+ char *md5, *p, *q, *response, *session, *stream_url;
+ bool success;
+
+ if (strncmp(url, "lastfm://", 9) != 0)
+ return false;
+
+ /* handshake */
+
+#if GLIB_CHECK_VERSION(2,16,0)
+ q = g_uri_escape_string(lastfm_user, NULL, false);
+#else
+ q = g_strdup(lastfm_username);
+#endif
+
+#if GLIB_CHECK_VERSION(2,16,0)
+ if (strlen(lastfm_password) != 32)
+ md5 = g_compute_checksum_for_string(G_CHECKSUM_MD5,
+ lastfm_password,
+ strlen(lastfm_password));
+ else
+#endif
+ md5 = g_strdup(lastfm_password);
+
+ p = g_strconcat("http://ws.audioscrobbler.com/radio/handshake.php?"
+ "version=1.1.1&platform=linux&"
+ "username=", q, "&"
+ "passwordmd5=", md5, "&debug=0&partner=", NULL);
+ g_free(q);
+ g_free(md5);
+
+ response = lastfm_get(p);
+ g_free(p);
+ if (response == NULL)
+ return false;
+
+ /* extract session id from response */
+
+ session = lastfm_find(response, "session");
+ stream_url = lastfm_find(response, "stream_url");
+ g_free(response);
+ if (session == NULL || stream_url == NULL) {
+ g_free(session);
+ g_free(stream_url);
+ return false;
+ }
+
+#if GLIB_CHECK_VERSION(2,16,0)
+ q = g_uri_escape_string(session, NULL, false);
+ g_free(session);
+ session = q;
+#endif
+
+ /* "adjust" last.fm radio */
+
+ if (strlen(url) > 9) {
+ char *escaped_url;
+
+#if GLIB_CHECK_VERSION(2,16,0)
+ escaped_url = g_uri_escape_string(url, NULL, false);
+#else
+ escaped_url = g_strdup(url);
+#endif
+
+ p = g_strconcat("http://ws.audioscrobbler.com/radio/adjust.php?"
+ "session=", session, "&url=", escaped_url, "&debug=0",
+ NULL);
+ g_free(escaped_url);
+
+ response = lastfm_get(p);
+ g_free(response);
+ g_free(p);
+
+ if (response == NULL) {
+ g_free(session);
+ g_free(stream_url);
+ return false;
+ }
+ }
+
+ /* load 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);
+
+ response = lastfm_get(p);
+ g_free(p);
+
+ if (response == NULL) {
+ g_free(stream_url);
+ return false;
+ }
+
+ p = strstr(response, "<location>");
+ if (p == NULL) {
+ g_free(response);
+ g_free(stream_url);
+ return false;
+ }
+
+ p += 10;
+ q = strchr(p, '<');
+
+ if (q == NULL) {
+ g_free(response);
+ g_free(stream_url);
+ return false;
+ }
+
+ g_free(stream_url);
+ stream_url = g_strndup(p, q - p);
+ g_free(response);
+
+ /* now really open the last.fm radio stream */
+
+ success = input_stream_open(is, stream_url);
+ g_free(stream_url);
+ return success;
+}
+
+const struct input_plugin lastfm_input_plugin = {
+ .name = "lastfm",
+ .init = lastfm_input_init,
+ .open = lastfm_input_open,
+};
diff --git a/src/input/lastfm_input_plugin.h b/src/input/lastfm_input_plugin.h
new file mode 100644
index 000000000..8a2854214
--- /dev/null
+++ b/src/input/lastfm_input_plugin.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2003-2009 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef LASTFM_INPUT_PLUGIN_H
+#define LASTFM_INPUT_PLUGIN_H
+
+extern const struct input_plugin lastfm_input_plugin;
+
+#endif
diff --git a/src/input_stream.c b/src/input_stream.c
index e07a3ab52..95644f5d8 100644
--- a/src/input_stream.c
+++ b/src/input_stream.c
@@ -30,6 +30,8 @@
#include "input/curl_input_plugin.h"
#endif
+#include "input/lastfm_input_plugin.h"
+
#ifdef ENABLE_MMS
#include "input/mms_input_plugin.h"
#endif
@@ -46,6 +48,9 @@ static const struct input_plugin *const input_plugins[] = {
#ifdef HAVE_CURL
&input_plugin_curl,
#endif
+#ifdef ENABLE_LASTFM
+ &lastfm_input_plugin,
+#endif
#ifdef ENABLE_MMS
&input_plugin_mms,
#endif
diff --git a/src/ls.c b/src/ls.c
index a4d0f2f7e..c6987aedb 100644
--- a/src/ls.c
+++ b/src/ls.c
@@ -28,6 +28,9 @@ static const char *remoteUrlPrefixes[] = {
#ifdef HAVE_CURL
"http://",
#endif
+#ifdef ENABLE_LASTFM
+ "lastfm://",
+#endif
#ifdef ENABLE_MMS
"mms://",
"mmsh://",