protected async Task DiscoverData()
{
OnStateChange(MediaProcessState.FetchingMetadata);
// Download the URL given
var html = await _client
.WithUrl(URL.ToString())
.GetStringAsync();
// Extract the URL from a script tag that looks like this: https://a-v2.sndcdn.com/assets/app-009bd-1ba53b3.js
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);
string appJsUrl = doc.DocumentNode.SelectNodes("//script[@src]")
.Select(node => node.Attributes["src"].Value)
.Where(src => src.Contains("app-"))
.Distinct()
.Single();
// Download the JS file containing the client_id
// client_id:"02gUJC0hH2ct1EGOcYXQIzRFU91c72Ea"
var appJs = await _client
.WithUrl(new Url(appJsUrl))
.GetStringAsync();
string clientId = _clientIdRegex
.Matches(appJs)
.Cast <Match>()
.Select(x => x.Groups["client_id"].Value)
.Distinct()
.Single(); // Make sure they are all equal
// Find track_id
// Look in script tags for JSON
_trackId = doc.DocumentNode
.SelectNodes("//script[not(@src)]")
.Select(node => node.InnerText) // strings containing JavaScript
.Select(js => _trackIdRegex.Match(js)) // Regex.Match
.Select(match => match.Groups["track_id"].Value) // strings of track IDs
.Where(x => !string.IsNullOrEmpty(x))
.Distinct()
.Single();
// Find URL of MP3 or the stupid playlist thing
// https://api.soundcloud.com/i1/tracks/102140448/streams?client_id=02gUJC0hH2ct1EGOcYXQIzRFU91c72Ea
string streamInfoURL = string.Format(_streamInfoUrlFormat, _trackId, clientId);
string streamInfoJSON = await _client
.WithUrl(streamInfoURL)
.GetStringAsync();
var urlMap = new { http_mp3_128_url = "", hls_mp3_128_url = "" };
urlMap = JsonConvert.DeserializeAnonymousType(streamInfoJSON, urlMap);
if (!string.IsNullOrWhiteSpace(urlMap.http_mp3_128_url))
{
_songDataURL = urlMap.http_mp3_128_url;
_mediaType = SoundCloudMediaType.MP3;
}
else if (!string.IsNullOrWhiteSpace(urlMap.hls_mp3_128_url))
{
_songDataURL = urlMap.hls_mp3_128_url;
_mediaType = SoundCloudMediaType.Playlist;
}
else
{
Clipboard.SetText(streamInfoJSON);
throw new InvalidDataException(
"Could not find the HTTP MP3/Playlist URL. JSON dump was copied to clipboard.");
}
_discovered = true;
OnStateChange(MediaProcessState.Idle);
}
protected async Task DiscoverData()
{
OnStateChange(MediaProcessState.FetchingMetadata);
// Download the URL given
var html = await _client
.WithUrl(URL.ToString())
.GetStringAsync();
// Extract the URL from a script tag that looks like this: https://a-v2.sndcdn.com/assets/app-009bd-1ba53b3.js
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml(html);
string appJsUrl = doc.DocumentNode.SelectNodes("//script[@src]")
.Select(node => node.Attributes["src"].Value)
.Where(src => src.Contains("app-"))
.Distinct()
.Single();
// Download the JS file containing the client_id
// client_id:"02gUJC0hH2ct1EGOcYXQIzRFU91c72Ea"
var appJs = await _client
.WithUrl(new Url(appJsUrl))
.GetStringAsync();
string clientId = _clientIdRegex
.Matches(appJs)
.Cast<Match>()
.Select(x => x.Groups["client_id"].Value)
.Distinct()
.Single(); // Make sure they are all equal
// Find track_id
// Look in script tags for JSON
_trackId = doc.DocumentNode
.SelectNodes("//script[not(@src)]")
.Select(node => node.InnerText) // strings containing JavaScript
.Select(js => _trackIdRegex.Match(js)) // Regex.Match
.Select(match => match.Groups["track_id"].Value) // strings of track IDs
.Where(x => !string.IsNullOrEmpty(x))
.Distinct()
.Single();
// Find URL of MP3 or the stupid playlist thing
// https://api.soundcloud.com/i1/tracks/102140448/streams?client_id=02gUJC0hH2ct1EGOcYXQIzRFU91c72Ea
string streamInfoURL = string.Format(_streamInfoUrlFormat, _trackId, clientId);
string streamInfoJSON = await _client
.WithUrl(streamInfoURL)
.GetStringAsync();
var urlMap = new { http_mp3_128_url = "", hls_mp3_128_url = "" };
urlMap = JsonConvert.DeserializeAnonymousType(streamInfoJSON, urlMap);
if (!string.IsNullOrWhiteSpace(urlMap.http_mp3_128_url))
{
_songDataURL = urlMap.http_mp3_128_url;
_mediaType = SoundCloudMediaType.MP3;
}
else if (!string.IsNullOrWhiteSpace(urlMap.hls_mp3_128_url))
{
_songDataURL = urlMap.hls_mp3_128_url;
_mediaType = SoundCloudMediaType.Playlist;
}
else
{
Clipboard.SetText(streamInfoJSON);
throw new InvalidDataException(
"Could not find the HTTP MP3/Playlist URL. JSON dump was copied to clipboard.");
}
_discovered = true;
OnStateChange(MediaProcessState.Idle);
}