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/* 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,
};
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