Implemented basic user auth, register, login, details and avatar stuff from helio

Moonlight/App/Services/Utils/JwtService.cs

@@ -0,0 +1,73 @@
+using JWT.Algorithms;
+using JWT.Builder;
+using Newtonsoft.Json;
+
+namespace Moonlight.App.Services.Utils;
+
+public class JwtService
+{
+    private readonly ConfigService ConfigService;
+    private readonly TimeSpan DefaultDuration = TimeSpan.FromDays(365 * 10);
+
+    public JwtService(ConfigService configService)
+    {
+        ConfigService = configService;
+    }
+
+    public Task<string> Create(Action<Dictionary<string, string>> data, TimeSpan? validDuration = null)
+    {
+        var builder = new JwtBuilder()
+            .WithSecret(ConfigService.Get().Security.Token)
+            .IssuedAt(DateTime.UtcNow)
+            .ExpirationTime(DateTime.UtcNow.Add(validDuration ?? DefaultDuration))
+            .WithAlgorithm(new HMACSHA512Algorithm());
+
+        var dataDic = new Dictionary<string, string>();
+        data.Invoke(dataDic);
+
+        foreach (var entry in dataDic)
+            builder = builder.AddClaim(entry.Key, entry.Value);
+
+        var jwt = builder.Encode();
+        
+        return Task.FromResult(jwt);
+    }
+
+    public Task<bool> Validate(string token)
+    {
+        try
+        {
+            _ = new JwtBuilder()
+                .WithSecret(ConfigService.Get().Security.Token)
+                .WithAlgorithm(new HMACSHA512Algorithm())
+                .MustVerifySignature()
+                .Decode(token);
+            
+            return Task.FromResult(true);
+        }
+        catch (Exception e)
+        {
+            return Task.FromResult(false);
+        }
+    }
+
+    public Task<Dictionary<string, string>> Decode(string token)
+    {
+        try
+        {
+            var json = new JwtBuilder()
+                .WithSecret(ConfigService.Get().Security.Token)
+                .WithAlgorithm(new HMACSHA512Algorithm())
+                .MustVerifySignature()
+                .Decode(token);
+
+            var data = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);
+            
+            return Task.FromResult(data)!;
+        }
+        catch (Exception)
+        {
+            return Task.FromResult<Dictionary<string, string>>(null!);
+        }
+    }
+}