/*

* Copyright (C) 2010 Felipe Contreras

*

* This code is licenced under the LGPLv2.1.

*/

#include "scrobble.h"

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <stdbool.h>

#include <stdarg.h>

#include <glib.h>

#include <libsoup/soup.h>

struct sr_session_priv {

};

static void now_playing(sr_session_t *s, sr_track_t *t);

static void ws_auth(sr_session_t *s);

static void ws_love(sr_session_t *s);

sr_session_t *

sr_session_new(const char *url,

const char *client_id,

const char *client_ver)

{

sr_session_t *s;

struct sr_session_priv *priv;

s = calloc(1, sizeof(*s));

s->priv = priv = calloc(1, sizeof(*priv));

priv->queue = g_queue_new();

priv->queue_mutex = g_mutex_new();

priv->url = g_strdup(url);

priv->client_id = g_strdup(client_id);

priv->client_ver = g_strdup(client_ver);

priv->soup = soup_session_async_new();

priv->handshake_delay = 1;

priv->love_queue = g_queue_new();

priv->love_queue_mutex = g_mutex_new();

return s;

}

void

sr_session_free(sr_session_t *s)

{

struct sr_session_priv *priv;

if (!s)

return;

priv = s->priv;

while (!g_queue_is_empty(priv->love_queue)) {

sr_track_t *t;

t = g_queue_pop_head(priv->love_queue);

sr_track_free(t);

}

g_queue_free(priv->love_queue);

g_mutex_free(priv->love_queue_mutex);

g_free(priv->api_url);

g_free(priv->api_key);

g_free(priv->api_secret);

g_free(priv->session_key);

if (priv->np_timer)

g_source_remove(priv->np_timer);

soup_session_abort(priv->soup);

g_object_unref(priv->soup);

while (!g_queue_is_empty(priv->queue)) {

sr_track_t *t;

t = g_queue_pop_head(priv->queue);

sr_track_free(t);

}

g_queue_free(priv->queue);

g_mutex_free(priv->queue_mutex);

g_free(priv->url);

g_free(priv->client_id);

g_free(priv->client_ver);

g_free(priv->user);

g_free(priv->hash_pwd);

g_free(priv->session_id);

g_free(priv->now_playing_url);

g_free(priv->submit_url);

free(s->priv);

free(s);

}

void sr_session_set_cred(sr_session_t *s,

char *user,

char *password)

{

struct sr_session_priv *priv = s->priv;

g_free(priv->user);

g_free(priv->hash_pwd);

priv->user = g_strdup(user);

priv->hash_pwd = g_compute_checksum_for_string(G_CHECKSUM_MD5, password, -1);

}

void sr_session_set_cred_hash(sr_session_t *s,

char *user,

char *hash_pwd)

{

struct sr_session_priv *priv = s->priv;

g_free(priv->user);

g_free(priv->hash_pwd);

priv->user = g_strdup(user);

priv->hash_pwd = g_strdup(hash_pwd);

}

sr_track_t *

sr_track_new(void)

{

sr_track_t *t;

t = calloc(1, sizeof(*t));

return t;

}

void

sr_track_free(sr_track_t *t)

{

if (!t)

return;

g_free(t->artist);

g_free(t->title);

g_free(t->album);

g_free(t->mbid);

free(t);

}

sr_track_t *

sr_track_dup(sr_track_t *in)

{

sr_track_t *t;

t = sr_track_new();

t->artist = g_strdup(in->artist);

t->title = g_strdup(in->title);

t->timestamp = in->timestamp;

t->source = in->source;

t->rating = in->rating;

t->length = in->length;

t->album = g_strdup(in->album);

t->position = in->position;

t->mbid = g_strdup(in->mbid);

return t;

}

static inline void

check_last(sr_session_t *s,

int timestamp)

{

struct sr_session_priv *priv = s->priv;

sr_track_t *c;

int playtime;

c = priv->last_track;

if (!c)

return;

if (c->rating == 'L' && priv->session_key) {

g_mutex_lock(priv->love_queue_mutex);

g_queue_push_tail(priv->love_queue, sr_track_dup(c));

g_mutex_unlock(priv->love_queue_mutex);

if (!priv->api_problems)

ws_love(s);

}

playtime = timestamp - c->timestamp;

/* did the last track played long enough? */

if ((playtime >= 240 || playtime >= c->length / 2) && c->length > 30)

g_queue_push_tail(priv->queue, c);

else

sr_track_free(c);

priv->last_track = NULL;

}

void

sr_session_pause(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

g_mutex_lock(priv->queue_mutex);

check_last(s, time(NULL));

g_mutex_unlock(priv->queue_mutex);

}

static gboolean

do_now_playing(void *data)

{

sr_session_t *s = data;

struct sr_session_priv *priv = s->priv;

priv->np_timer = 0;

now_playing(s, priv->last_track);

return FALSE;

}

void

sr_session_add_track(sr_session_t *s,

sr_track_t *t)

{

struct sr_session_priv *priv = s->priv;

if (priv->np_timer)

g_source_remove(priv->np_timer);

priv->np_timer = g_timeout_add_seconds(3, do_now_playing, s);

g_mutex_lock(priv->queue_mutex);

check_last(s, t->timestamp);

priv->last_track = t;

g_mutex_unlock(priv->queue_mutex);

}

static inline void

got_field(sr_track_t *t,

char k,

const char *value)

{

switch (k) {

case 'a':

t->artist = g_strdup(value);

break;

case 't':

t->title = g_strdup(value);

break;

case 'i':

t->timestamp = atoi(value);

break;

case 'o':

t->source = value[0];

break;

case 'r':

t->rating = value[0];

break;

case 'l':

t->length = atoi(value);

break;

case 'b':

t->album = g_strdup(value);

break;

case 'n':

t->position = atoi(value);

break;

case 'm':

t->mbid = g_strdup(value);

break;

default:

break;

}

}

static inline bool

track_is_valid(sr_track_t *t)

{

return !!t->artist;

}

int

sr_session_load_list(sr_session_t *s,

const char *file)

{

struct sr_session_priv *priv = s->priv;

FILE *f;

int c;

char k, *p, v[255];

int stage = 1;

sr_track_t *t;

f = fopen(file, "r");

if (!f)

return 1;

/* just to avoid warnings */

k = 0; p = NULL;

g_mutex_lock(priv->queue_mutex);

t = sr_track_new();

while (true) {

c = getc(f);

if (stage == 1) {

if (c == '\n') {

g_queue_push_tail(priv->queue, t);

t = sr_track_new();

continue;

}

if (c == EOF) {

if (track_is_valid(t))

g_queue_push_tail(priv->queue, t);

break;

}

k = c;

p = v;

fseek(f, 2, SEEK_CUR);

stage++;

}

else if (stage == 2) {

if (c == EOF)

break;

*p = c;

if (c == '\n') {

*p = '\0';

got_field(t, k, v);

stage = 1;

}

p++;

}

}

g_mutex_unlock(priv->queue_mutex);

fclose(f);

return 0;

}

static void

store_track(void *data,

void *user_data)

{

sr_track_t *t = data;

FILE *f = user_data;

fprintf(f, "a: %s\n", t->artist);

fprintf(f, "t: %s\n", t->title);

fprintf(f, "i: %u\n", t->timestamp);

fprintf(f, "o: %c\n", t->source);

if (t->rating)

fprintf(f, "r: %c\n", t->rating);

fprintf(f, "l: %i\n", t->length);

if (t->album)

fprintf(f, "b: %s\n", t->album);

if (t->position)

fprintf(f, "n: %i\n", t->position);

if (t->mbid)

fprintf(f, "m: %s\n", t->mbid);

fputc('\n', f);

}

int

sr_session_store_list(sr_session_t *s,

const char *file)

{

FILE *f;

struct sr_session_priv *priv = s->priv;

f = fopen(file, "w");

g_mutex_lock(priv->queue_mutex);

g_queue_foreach(priv->queue, store_track, f);

g_mutex_unlock(priv->queue_mutex);

fclose(f);

return 0;

}

void

sr_session_test(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

g_mutex_lock(priv->queue_mutex);

g_queue_foreach(priv->queue, store_track, stdout);

g_mutex_unlock(priv->queue_mutex);

}

static void

parse_handshake(sr_session_t *s,

const char *data)

{

struct sr_session_priv *priv = s->priv;

char **response;

response = g_strsplit(data, "\n", 5);

g_free(priv->session_id);

g_free(priv->now_playing_url);

g_free(priv->submit_url);

priv->session_id = g_strdup(response[1]);

priv->now_playing_url = g_strdup(response[2]);

priv->submit_url = g_strdup(response[3]);

g_strfreev(response);

}

static gboolean

try_handshake(void *data)

{

sr_session_handshake(data);

return false;

}

static inline void

handshake_failure(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

g_timeout_add_seconds(priv->handshake_delay * 60,

try_handshake, s);

if (priv->handshake_delay < 120)

priv->handshake_delay *= 2;

}

static inline void

fatal_error(sr_session_t *s,

const char *msg)

{

if (s->error_cb)

s->error_cb(s, true, msg);

}

static void

handshake_cb(SoupSession *session,

SoupMessage *message,

void *user_data)

{

sr_session_t *s = user_data;

struct sr_session_priv *priv = s->priv;

const char *data, *end;

if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code)) {

handshake_failure(s);

return;

}

data = message->response_body->data;

end = strchr(data, '\n');

if (!end) /* really bad */

return;

if (strncmp(data, "OK", end - data) == 0) {

priv->handshake_delay = 1;

parse_handshake(s, data);

sr_session_submit(s);

}

else if (strncmp(data, "BANNED", end - data) == 0)

fatal_error(s, "Client is banned");

else if (strncmp(data, "BADAUTH", end - data) == 0)

fatal_error(s, "Bad authorization");

else if (strncmp(data, "BADTIME", end - data) == 0)

fatal_error(s, "Wrong system time");

else

handshake_failure(s);

}

void

sr_session_handshake(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

gchar *auth, *tmp;

glong timestamp;

gchar *handshake_url;

SoupMessage *message;

GTimeVal time_val;

g_get_current_time(&time_val);

timestamp = time_val.tv_sec;

tmp = g_strdup_printf("%s%li", priv->hash_pwd, timestamp);

auth = g_compute_checksum_for_string(G_CHECKSUM_MD5, tmp, -1);

g_free(tmp);

handshake_url = g_strdup_printf("%s&p=1.2.1&c=%s&v=%s&u=%s&t=%li&a=%s",

priv->url,

priv->client_id,

priv->client_ver,

priv->user,

timestamp,

auth);

message = soup_message_new("GET", handshake_url);

soup_session_queue_message(priv->soup,

message,

handshake_cb,

s);

g_free(handshake_url);

g_free(auth);

if (priv->api_key) {

if (!priv->session_key)

ws_auth(s);

else

ws_love(s);

}

}

static void

drop_submitted(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

int c;

g_mutex_lock(priv->queue_mutex);

for (c = 0; c < priv->submit_count; c++) {

sr_track_t *t;

t = g_queue_pop_head(priv->queue);

if (!t)

break;

sr_track_free(t);

}

priv->submit_count = 0;

g_mutex_unlock(priv->queue_mutex);

if (!g_queue_is_empty(priv->queue))

/* still need to submit more */

sr_session_submit(s);

else if (s->scrobble_cb)

s->scrobble_cb(s);

}

static inline void

invalidate_session(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

g_free(priv->session_id);

priv->session_id = NULL;

sr_session_handshake(s);

}

static inline void

hard_failure(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

priv->hard_failure_count++;

if (priv->hard_failure_count >= 3)

invalidate_session(s);

}

static void

scrobble_cb(SoupSession *session,

SoupMessage *message,

void *user_data)

{

sr_session_t *s = user_data;

struct sr_session_priv *priv = s->priv;

const char *data, *end;

if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code)) {

hard_failure(s);

goto nok;

}

data = message->response_body->data;

end = strchr(data, '\n');

if (!end) /* really bad */

goto nok;

if (strncmp(data, "OK", end - data) == 0) {

drop_submitted(user_data);

return;

}

else if (strncmp(data, "BADSESSION", end - data) == 0)

invalidate_session(s);

else

hard_failure(s);

nok:

g_mutex_lock(priv->queue_mutex);

priv->submit_count = 0;

g_mutex_unlock(priv->queue_mutex);

}

#define ADD_FIELD(id, fmt, field) \

do { \

if ((field)) \

g_string_append_printf(data, "&" id "[%i]=%" fmt, i, (field)); \

else \

g_string_append_printf(data, "&" id "[%i]=", i); \

} while (0);

#define EXTRA_URI_ENCODE_CHARS "&+"

void

sr_session_submit(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

SoupMessage *message;

int i = 0;

GString *data;

GList *c;

/* haven't got the session yet? */

if (!priv->session_id)

return;

g_mutex_lock(priv->queue_mutex);

if (g_queue_is_empty(priv->queue) || priv->submit_count) {

g_mutex_unlock(priv->queue_mutex);

return;

}

data = g_string_new(NULL);

g_string_append_printf(data, "s=%s", priv->session_id);

for (c = priv->queue->head; c; c = c->next) {

sr_track_t *t = c->data;

char *artist, *title;

char *album = NULL, *mbid = NULL;

artist = soup_uri_encode(t->artist, EXTRA_URI_ENCODE_CHARS);

title = soup_uri_encode(t->title, EXTRA_URI_ENCODE_CHARS);

if (t->album)

album = soup_uri_encode(t->album, EXTRA_URI_ENCODE_CHARS);

if (t->mbid)

mbid = soup_uri_encode(t->mbid, EXTRA_URI_ENCODE_CHARS);

/* required fields */

g_string_append_printf(data, "&a[%i]=%s&t[%i]=%s&i[%i]=%i&o[%i]=%c",

i, artist,

i, title,

i, t->timestamp,

i, t->source);

/* optional fields */

ADD_FIELD("r", "c", t->rating);

ADD_FIELD("l", "i", t->length);

ADD_FIELD("b", "s", album);

ADD_FIELD("n", "i", t->position);

ADD_FIELD("m", "s", mbid);

g_free(artist);

g_free(title);

g_free(album);

g_free(mbid);

if (++i >= 50)

break;

}

priv->submit_count = i;

g_mutex_unlock(priv->queue_mutex);

message = soup_message_new("POST", priv->submit_url);

soup_message_set_request(message,

"application/x-www-form-urlencoded",

SOUP_MEMORY_TAKE,

data->str,

data->len);

soup_session_queue_message(priv->soup,

message,

scrobble_cb,

s);

g_string_free(data, false); /* soup gets ownership */

}

static void

now_playing_cb(SoupSession *session,

SoupMessage *message,

void *user_data)

{

sr_session_t *s = user_data;

const char *data, *end;

if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code))

/* now need to do anything drastic, right? */

return;

data = message->response_body->data;

end = strchr(data, '\n');

if (!end) /* really bad */

return;

if (strncmp(data, "BADSESSION", end - data) == 0)

invalidate_session(s);

}

#undef ADD_FIELD

#define ADD_FIELD(id, fmt, field) \

do { \

if ((field)) \

g_string_append_printf(data, "&" id "=%" fmt, (field)); \

else \

g_string_append_printf(data, "&" id "="); \

} while (0);

static void

now_playing(sr_session_t *s,

sr_track_t *t)

{

struct sr_session_priv *priv = s->priv;

SoupMessage *message;

GString *data;

char *artist, *title;

char *album = NULL, *mbid = NULL;

/* haven't got the session yet? */

if (!priv->session_id)

return;

data = g_string_new(NULL);

g_string_append_printf(data, "s=%s", priv->session_id);

artist = soup_uri_encode(t->artist, EXTRA_URI_ENCODE_CHARS);

title = soup_uri_encode(t->title, EXTRA_URI_ENCODE_CHARS);

if (t->album)

album = soup_uri_encode(t->album, EXTRA_URI_ENCODE_CHARS);

if (t->mbid)

mbid = soup_uri_encode(t->mbid, EXTRA_URI_ENCODE_CHARS);

/* required fields */

g_string_append_printf(data, "&a=%s&t=%s", artist, title);

/* optional fields */

ADD_FIELD("b", "s", album);

ADD_FIELD("l", "i", t->length);

ADD_FIELD("n", "i", t->position);

ADD_FIELD("m", "s", mbid);

g_free(artist);

g_free(title);

g_free(album);

g_free(mbid);

message = soup_message_new("POST", priv->now_playing_url);

soup_message_set_request(message,

"application/x-www-form-urlencoded",

SOUP_MEMORY_TAKE,

data->str,

data->len);

soup_session_queue_message(priv->soup,

message,

now_playing_cb,

s);

g_string_free(data, false); /* soup gets ownership */

}

void

sr_session_set_proxy(sr_session_t *s, const char *url)

{

struct sr_session_priv *priv = s->priv;

SoupURI *soup_uri;

if (url)

soup_uri = soup_uri_new(url);

else

soup_uri = NULL;

g_object_set(priv->soup, "proxy-uri", soup_uri, NULL);

}

/* web-service */

void

sr_session_set_session_key(sr_session_t *s,

const char *session_key)

{

struct sr_session_priv *priv = s->priv;

priv->session_key = g_strdup(session_key);

}

void

sr_session_set_api(sr_session_t *s,

const char *api_url,

const char *api_key,

const char *api_secret)

{

struct sr_session_priv *priv = s->priv;

priv->api_url = g_strdup(api_url);

priv->api_key = g_strdup(api_key);

priv->api_secret = g_strdup(api_secret);

}

struct ws_param {

const char *key;

const char *value;

};

static struct ws_param *

param_new(const char *key, const char *value)

{

struct ws_param *p = malloc(sizeof(*p));

p->key = key;

p->value = value;

return p;

}

static int

param_compare(struct ws_param *a, struct ws_param *b)

{

return strcmp(a->key, b->key);

}

static void ws_params(sr_session_t *s, char **params, ...) __attribute__((sentinel));

static void

ws_params(sr_session_t *s, char **params, ...)

{

struct sr_session_priv *priv = s->priv;

GList *l = NULL;

va_list args;

GString *params_str, *tmp;

gchar *api_sig;

if (!params)

return;

params_str = g_string_sized_new(0x100);

va_start(args, params);

do {

const char *key, *value;

key = va_arg(args, char *);

if (!key)

break;

value = va_arg(args, char *);

if (!value)

break;

l = g_list_prepend(l, param_new(key, value));

g_string_append_printf(params_str, "&%s=%s", key, value);

} while (true);

va_end(args);

l = g_list_sort(l, (GCompareFunc) param_compare);

tmp = g_string_sized_new(0x100);

GList *c;

for (c = l; c; c = c->next) {

struct ws_param *p = c->data;

g_string_append_printf(tmp, "%s%s", p->key, p->value);

}

g_string_append(tmp, priv->api_secret);

api_sig = g_compute_checksum_for_string(G_CHECKSUM_MD5, tmp->str, -1);

g_string_free(tmp, TRUE);

g_list_foreach(l, (GFunc) free, NULL);

g_string_append_printf(params_str, "&api_sig=%s", api_sig);

g_free(api_sig);

*params = params_str->str;

g_string_free(params_str, FALSE);

}

static void

ws_auth_cb(SoupSession *session,

SoupMessage *message,

void *user_data)

{

sr_session_t *s = user_data;

struct sr_session_priv *priv = s->priv;

const char *data, *begin, *end;

if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code))

return;

data = message->response_body->data;

begin = strstr(data, "<key>");

if (!begin) /* really bad */

return;

begin += 5;

end = strstr(begin, "</key>");

if (!end) /* really bad */

return;

priv->session_key = g_strndup(begin, end - begin);

if (s->session_key_cb)

s->session_key_cb(s, priv->session_key);

}

static void

ws_auth(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

gchar *auth, *tmp;

gchar *auth_url;

SoupMessage *message;

gchar *params;

tmp = g_strdup_printf("%s%s", priv->user, priv->hash_pwd);

auth = g_compute_checksum_for_string(G_CHECKSUM_MD5, tmp, -1);

g_free(tmp);

ws_params(s, &params,

"api_key", priv->api_key,

"authToken", auth,

"method", "auth.getMobileSession",

"username", priv->user,

NULL);

auth_url = g_strdup_printf("%s?%s",

priv->api_url,

params);

g_free(params);

message = soup_message_new("GET", auth_url);

soup_session_queue_message(priv->soup,

message,

ws_auth_cb,

s);

g_free(auth_url);

g_free(auth);

}

static void

ws_love_cb(SoupSession *session,

SoupMessage *message,

void *user_data)

{

sr_session_t *s = user_data;

struct sr_session_priv *priv = s->priv;

sr_track_t *t;

if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code)) {

priv->api_problems = true;

return;

}

g_mutex_lock(priv->love_queue_mutex);

t = g_queue_pop_head(priv->love_queue);

g_mutex_unlock(priv->love_queue_mutex);

sr_track_free(t);

priv->api_problems = false;

if (!g_queue_is_empty(priv->love_queue))

/* still need to submit more */

ws_love(s);

}

static void

ws_love(sr_session_t *s)

{

struct sr_session_priv *priv = s->priv;

SoupMessage *message;

gchar *params;

sr_track_t *t;

g_mutex_lock(priv->love_queue_mutex);

t = g_queue_peek_head(priv->love_queue);

g_mutex_unlock(priv->love_queue_mutex);

if (!t)

return;

ws_params(s, &params,

"method", "track.love",

"api_key", priv->api_key,

"sk", priv->session_key,

"track", t->title,

"artist", t->artist,

NULL);

message = soup_message_new("POST", priv->api_url);

soup_message_set_request(message,

"application/x-www-form-urlencoded",

SOUP_MEMORY_TAKE,

params,

strlen(params));

soup_session_queue_message(priv->soup,

message,

ws_love_cb,

s);

}

void

sr_session_set_love(sr_session_t *s, int on)

{

struct sr_session_priv *priv = s->priv;

sr_track_t *c;

c = priv->last_track;

if (!c)

return;

c->rating = on ? 'L' : '\0';

}