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DeezerAPI.cs
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DeezerAPI.cs
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using System;
using System.IO;
using System.Net;
using System.Text;
using System.Diagnostics;
using System.Threading.Tasks;
using System.Runtime.InteropServices;
using Newtonsoft.Json;
namespace Deezcord
{
public static class DeezerAPI
{
private const string redirectUri = "http://127.0.0.1:5000/";
private const string authorizationEndpoint = "https://connect.deezer.com/oauth/auth.php";
private const string tokenRequestUri = "https://connect.deezer.com/oauth/access_token.php";
private const string lastTrackEndpoint = "https://api.deezer.com/user/me/history";
private const string userEndpoint = "https://api.deezer.com/user/me";
private const string tokenPath = "token.txt";
private static string token;
public static async Task Authenticate()
{
Console.WriteLine($"Redirect URI: {redirectUri}");
HttpListener http = new HttpListener();
http.Prefixes.Add(redirectUri);
Console.WriteLine("Listening...");
http.Start();
string authorizationRequest = $"https://connect.deezer.com/oauth/auth.php?app_id={APIKeys.DeezerClientId}&redirect_uri={Uri.EscapeDataString(redirectUri)}&perms=listening_history";
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
ProcessStartInfo psi = new ProcessStartInfo
{
UseShellExecute = true,
FileName = authorizationRequest
};
Process.Start(psi);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
{
Process.Start("xdg-open", authorizationRequest);
}
else if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
{
Process.Start("open", authorizationRequest);
}
HttpListenerContext context = await http.GetContextAsync();
HttpListenerResponse response = context.Response;
const string responseString = "<html><head><script type=\"text/javascript\">function closeMe() { window.close(); }</script></head><body>Please return to the app.</body></html>";
byte[] buffer = Encoding.UTF8.GetBytes(responseString);
response.ContentLength64 = buffer.Length;
Stream responseOutput = response.OutputStream;
await responseOutput.WriteAsync(buffer, 0, buffer.Length).ContinueWith((tasl) =>
{
responseOutput.Close();
http.Stop();
Console.WriteLine("HTTP server stopped.");
});
if (context.Request.QueryString.Get("error") != null)
{
Console.WriteLine($"OAuth authorization error: {context.Request.QueryString.Get("error")}");
return;
}
if (context.Request.QueryString.Get("code") == null)
{
Console.WriteLine($"Malformed authorization response. {context.Request.QueryString}");
return;
}
string code = context.Request.QueryString.Get("code");
Console.WriteLine($"Authorization code: {code}");
Console.WriteLine("Exchanging code for tokens...");
string tokenRequestBody = $"code={code}&app_id={APIKeys.DeezerClientId}&secret={APIKeys.DeezerClientSecret}&response_type=token";
HttpWebRequest tokenRequest = (HttpWebRequest)WebRequest.Create(tokenRequestUri);
tokenRequest.Method = "POST";
tokenRequest.ContentType = "application/x-www-form-urlencoded";
tokenRequest.Accept = "application/json";
byte[] byteVersion = Encoding.ASCII.GetBytes(tokenRequestBody);
tokenRequest.ContentLength = byteVersion.Length;
Stream stream = tokenRequest.GetRequestStream();
await stream.WriteAsync(byteVersion, 0, byteVersion.Length);
stream.Close();
try
{
WebResponse tokenResponse = await tokenRequest.GetResponseAsync();
using (StreamReader reader = new StreamReader(tokenResponse.GetResponseStream() ?? throw new Exception()))
{
string responseText = await reader.ReadToEndAsync();
token = responseText.Split('&')[0].Remove(0, 13);
System.Console.WriteLine($"Token: {token}");
}
}
catch (WebException e)
{
if (e.Status == WebExceptionStatus.ProtocolError)
{ }
if (e.Response is HttpWebResponse r)
{
Console.WriteLine($"HTTP: {response.StatusCode}");
using (StreamReader reader = new StreamReader(r.GetResponseStream() ?? throw new Exception()))
{
string responseText = await reader.ReadToEndAsync();
Console.WriteLine(responseText);
}
}
}
}
public static async Task<Track> LastTrack()
{
string requestUri = $"{lastTrackEndpoint}?access_token={token}";
HttpWebRequest userinfoRequest = (HttpWebRequest)WebRequest.Create(requestUri);
userinfoRequest.Method = "GET";
userinfoRequest.ContentType = "application/x-www-form-urlencoded";
userinfoRequest.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
WebResponse userinfoResponse = await userinfoRequest.GetResponseAsync();
using (StreamReader userinfoResponseReader = new StreamReader(userinfoResponse.GetResponseStream() ?? throw new Exception()))
{
string userinfoResponseText = await userinfoResponseReader.ReadToEndAsync();
if (userinfoResponseText.Contains("Invalid OAuth access token."))
{
await Authenticate();
return await LastTrack();
}
History tracks = JsonConvert.DeserializeObject<History>(userinfoResponseText);
return tracks.Tracks[0];
}
}
public static async Task<User> User()
{
string requestUri = $"{userEndpoint}?access_token={token}";
HttpWebRequest userinfoRequest = (HttpWebRequest)WebRequest.Create(requestUri);
userinfoRequest.Method = "GET";
userinfoRequest.ContentType = "application/x-www-form-urlencoded";
userinfoRequest.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
WebResponse userinfoResponse = await userinfoRequest.GetResponseAsync();
using (StreamReader userinfoResponseReader = new StreamReader(userinfoResponse.GetResponseStream() ?? throw new Exception()))
{
string userinfoResponseText = await userinfoResponseReader.ReadToEndAsync();
if (userinfoResponseText.Contains("Invalid OAuth access token."))
{
await Authenticate();
return await User();
}
User user = JsonConvert.DeserializeObject<User>(userinfoResponseText);
return user;
}
}
}
}