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Diffstat (limited to '')
| -rw-r--r-- | src/playlist/plugins/SoundCloudPlaylistPlugin.cxx | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/src/playlist/plugins/SoundCloudPlaylistPlugin.cxx b/src/playlist/plugins/SoundCloudPlaylistPlugin.cxx new file mode 100644 index 000000000..ec4d240a5 --- /dev/null +++ b/src/playlist/plugins/SoundCloudPlaylistPlugin.cxx @@ -0,0 +1,401 @@ +/* + * Copyright (C) 2003-2014 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 "SoundCloudPlaylistPlugin.hxx" +#include "../PlaylistPlugin.hxx" +#include "../MemorySongEnumerator.hxx" +#include "config/ConfigData.hxx" +#include "input/InputStream.hxx" +#include "tag/TagBuilder.hxx" +#include "util/StringUtil.hxx" +#include "util/Error.hxx" +#include "util/Domain.hxx" +#include "Log.hxx" + +#include <glib.h> +#include <yajl/yajl_parse.h> + +#include <string> + +#include <string.h> + +static struct { + std::string apikey; +} soundcloud_config; + +static constexpr Domain soundcloud_domain("soundcloud"); + +static bool +soundcloud_init(const config_param ¶m) +{ + // APIKEY for MPD application, registered under DarkFox' account. + soundcloud_config.apikey = param.GetBlockValue("apikey", "a25e51780f7f86af0afa91f241d091f8"); + if (soundcloud_config.apikey.empty()) { + LogDebug(soundcloud_domain, + "disabling the soundcloud playlist plugin " + "because API key is not set"); + return false; + } + + return true; +} + +/** + * Construct a full soundcloud resolver URL from the given fragment. + * @param uri uri of a soundcloud page (or just the path) + * @return Constructed URL. Must be freed with g_free. + */ +static char * +soundcloud_resolve(const char* uri) +{ + char *u, *ru; + + if (StringStartsWith(uri, "https://")) { + u = g_strdup(uri); + } else if (StringStartsWith(uri, "soundcloud.com")) { + u = g_strconcat("https://", uri, nullptr); + } else { + /* assume it's just a path on soundcloud.com */ + u = g_strconcat("https://soundcloud.com/", uri, nullptr); + } + + ru = g_strconcat("https://api.soundcloud.com/resolve.json?url=", + u, "&client_id=", + soundcloud_config.apikey.c_str(), nullptr); + g_free(u); + + return ru; +} + +/* YAJL parser for track data from both /tracks/ and /playlists/ JSON */ + +enum key { + Duration, + Title, + Stream_URL, + Other, +}; + +const char* key_str[] = { + "duration", + "title", + "stream_url", + nullptr, +}; + +struct parse_data { + int key; + char* stream_url; + long duration; + char* title; + int got_url; /* nesting level of last stream_url */ + + std::forward_list<DetachedSong> songs; +}; + +static int +handle_integer(void *ctx, + long +#ifndef HAVE_YAJL1 + long +#endif + intval) +{ + struct parse_data *data = (struct parse_data *) ctx; + + switch (data->key) { + case Duration: + data->duration = intval; + break; + default: + break; + } + + return 1; +} + +static int +handle_string(void *ctx, const unsigned char* stringval, +#ifdef HAVE_YAJL1 + unsigned int +#else + size_t +#endif + stringlen) +{ + struct parse_data *data = (struct parse_data *) ctx; + const char *s = (const char *) stringval; + + switch (data->key) { + case Title: + g_free(data->title); + data->title = g_strndup(s, stringlen); + break; + case Stream_URL: + g_free(data->stream_url); + data->stream_url = g_strndup(s, stringlen); + data->got_url = 1; + break; + default: + break; + } + + return 1; +} + +static int +handle_mapkey(void *ctx, const unsigned char* stringval, +#ifdef HAVE_YAJL1 + unsigned int +#else + size_t +#endif + stringlen) +{ + struct parse_data *data = (struct parse_data *) ctx; + + int i; + data->key = Other; + + for (i = 0; i < Other; ++i) { + if (memcmp((const char *)stringval, key_str[i], stringlen) == 0) { + data->key = i; + break; + } + } + + return 1; +} + +static int +handle_start_map(void *ctx) +{ + struct parse_data *data = (struct parse_data *) ctx; + + if (data->got_url > 0) + data->got_url++; + + return 1; +} + +static int +handle_end_map(void *ctx) +{ + struct parse_data *data = (struct parse_data *) ctx; + + if (data->got_url > 1) { + data->got_url--; + return 1; + } + + if (data->got_url == 0) + return 1; + + /* got_url == 1, track finished, make it into a song */ + data->got_url = 0; + + char *u = g_strconcat(data->stream_url, "?client_id=", + soundcloud_config.apikey.c_str(), nullptr); + + TagBuilder tag; + tag.SetDuration(SignedSongTime::FromMS(data->duration)); + if (data->title != nullptr) + tag.AddItem(TAG_NAME, data->title); + + data->songs.emplace_front(u, tag.Commit()); + g_free(u); + + return 1; +} + +static yajl_callbacks parse_callbacks = { + nullptr, + nullptr, + handle_integer, + nullptr, + nullptr, + handle_string, + handle_start_map, + handle_mapkey, + handle_end_map, + nullptr, + nullptr, +}; + +/** + * Read JSON data and parse it using the given YAJL parser. + * @param url URL of the JSON data. + * @param hand YAJL parser handle. + * @return -1 on error, 0 on success. + */ +static int +soundcloud_parse_json(const char *url, yajl_handle hand, + Mutex &mutex, Cond &cond) +{ + Error error; + InputStream *input_stream = InputStream::OpenReady(url, mutex, cond, + error); + if (input_stream == nullptr) { + if (error.IsDefined()) + LogError(error); + return -1; + } + + mutex.lock(); + + yajl_status stat; + int done = 0; + + while (!done) { + char buffer[4096]; + unsigned char *ubuffer = (unsigned char *)buffer; + const size_t nbytes = + input_stream->Read(buffer, sizeof(buffer), error); + if (nbytes == 0) { + if (error.IsDefined()) + LogError(error); + + if (input_stream->IsEOF()) { + done = true; + } else { + mutex.unlock(); + delete input_stream; + return -1; + } + } + + if (done) { +#ifdef HAVE_YAJL1 + stat = yajl_parse_complete(hand); +#else + stat = yajl_complete_parse(hand); +#endif + } else + stat = yajl_parse(hand, ubuffer, nbytes); + + if (stat != yajl_status_ok +#ifdef HAVE_YAJL1 + && stat != yajl_status_insufficient_data +#endif + ) + { + unsigned char *str = yajl_get_error(hand, 1, ubuffer, nbytes); + LogError(soundcloud_domain, (const char *)str); + yajl_free_error(hand, str); + break; + } + } + + mutex.unlock(); + delete input_stream; + + return 0; +} + +/** + * Parse a soundcloud:// URL and create a playlist. + * @param uri A soundcloud URL. Accepted forms: + * soundcloud://track/<track-id> + * soundcloud://playlist/<playlist-id> + * soundcloud://url/<url or path of soundcloud page> + */ +static SongEnumerator * +soundcloud_open_uri(const char *uri, Mutex &mutex, Cond &cond) +{ + assert(memcmp(uri, "soundcloud://", 13) == 0); + uri += 13; + + char *u = nullptr; + if (memcmp(uri, "track/", 6) == 0) { + const char *rest = uri + 6; + u = g_strconcat("https://api.soundcloud.com/tracks/", + rest, ".json?client_id=", + soundcloud_config.apikey.c_str(), nullptr); + } else if (memcmp(uri, "playlist/", 9) == 0) { + const char *rest = uri + 9; + u = g_strconcat("https://api.soundcloud.com/playlists/", + rest, ".json?client_id=", + soundcloud_config.apikey.c_str(), nullptr); + } else if (memcmp(uri, "user/", 5) == 0) { + const char *rest = uri + 5; + u = g_strconcat("https://api.soundcloud.com/users/", + rest, "/tracks.json?client_id=", + soundcloud_config.apikey.c_str(), nullptr); + } else if (memcmp(uri, "search/", 7) == 0) { + const char *rest = uri + 7; + u = g_strconcat("https://api.soundcloud.com/tracks.json?q=", + rest, "&client_id=", + soundcloud_config.apikey.c_str(), nullptr); + } else if (memcmp(uri, "url/", 4) == 0) { + const char *rest = uri + 4; + /* Translate to soundcloud resolver call. libcurl will automatically + follow the redirect to the right resource. */ + u = soundcloud_resolve(rest); + } + + if (u == nullptr) { + LogWarning(soundcloud_domain, "unknown soundcloud URI"); + return nullptr; + } + + struct parse_data data; + data.got_url = 0; + data.title = nullptr; + data.stream_url = nullptr; +#ifdef HAVE_YAJL1 + yajl_handle hand = yajl_alloc(&parse_callbacks, nullptr, nullptr, + &data); +#else + yajl_handle hand = yajl_alloc(&parse_callbacks, nullptr, &data); +#endif + + int ret = soundcloud_parse_json(u, hand, mutex, cond); + + g_free(u); + yajl_free(hand); + g_free(data.title); + g_free(data.stream_url); + + if (ret == -1) + return nullptr; + + data.songs.reverse(); + return new MemorySongEnumerator(std::move(data.songs)); +} + +static const char *const soundcloud_schemes[] = { + "soundcloud", + nullptr +}; + +const struct playlist_plugin soundcloud_playlist_plugin = { + "soundcloud", + + soundcloud_init, + nullptr, + soundcloud_open_uri, + nullptr, + + soundcloud_schemes, + nullptr, + nullptr, +}; + + |