Rewrite access tokens, initial admin api

extra/admin-api/Spacebar.AdminAPI/Middleware/AuthenticationMiddleware.cs

@@ -0,0 +1,53 @@
+using System.Buffers.Text;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Cryptography;
+using System.Text;
+using ArcaneLibs.Extensions;
+using Microsoft.EntityFrameworkCore.Internal;
+using Microsoft.IdentityModel.Tokens;
+using Spacebar.AdminAPI.Extensions;
+using Spacebar.Db.Contexts;
+
+namespace Spacebar.AdminAPI.Middleware;
+
+public class AuthenticationMiddleware(RequestDelegate next) {
+    public async Task Invoke(HttpContext context) {
+        if(Environment.GetEnvironmentVariable("SB_ADMIN_API_DISABLE_AUTH") == "true") {
+            await next(context);
+            return;
+        }
+        
+        if (!context.Request.Headers.ContainsKey("Authorization")) {
+            context.Response.StatusCode = 401;
+            await context.Response.WriteAsync("Authorization header is missing");
+            return;
+        }
+
+        var token = context.Request.Headers["Authorization"].ToString().Split(' ').Last();
+
+        var handler = new JwtSecurityTokenHandler();
+        var secretFile = File.ReadAllText("../../../jwt.key.pub");
+        var key = ECDsa.Create(ECCurve.NamedCurves.nistP256);
+        key.ImportFromPem(secretFile);
+
+        var res = await handler.ValidateTokenAsync(token, new TokenValidationParameters {
+            IssuerSigningKey = new ECDsaSecurityKey(key),
+            ValidAlgorithms = new[] { "ES512" },
+            LogValidationExceptions = true,
+            // These are required to be false for the token to be valid as they aren't provided by the token
+            ValidateIssuer = false,
+            ValidateLifetime = false,
+            ValidateAudience = false,
+        });
+
+        if (!res.IsValid) {
+            context.Response.StatusCode = 401;
+            await context.Response.WriteAsync("Invalid token");
+            return;
+        }
+
+        Console.WriteLine(res.ClaimsIdentity.Claims.Select(x => $"{x.Type} : {x.Value}").ToJson());
+
+        await next(context);
+    }
+}