metrics service

fixes to auth info

AobaServer/Services/AuthConfigService.cs

@@ -0,0 +1,26 @@
+using AobaServer.Models;
+
+using MongoDB.Driver;
+
+namespace AobaServer.Services;
+
+public class AuthConfigService(IMongoDatabase db)
+{
+	public IMongoCollection<AuthInfo> _authInfo = db.GetCollection<AuthInfo>("auth_config");
+
+	public async Task<AuthInfo> GetAuthInfoAsync(string issuer, string audience)
+	{
+		var info = await _authInfo.Find("{}").FirstOrDefaultAsync();
+		if(info != null)
+			return info;
+
+		info = AuthInfo.Create(issuer, audience);
+		await _authInfo.InsertOneAsync(info);
+		return info;
+	}
+
+	public Task<AuthInfo> GetDefaultAuthInfoAsync()
+	{
+		return GetAuthInfoAsync("aobaV2", "aoba");
+	}
+}

AobaServer/Services/MetricsRpcService.cs

@@ -0,0 +1,33 @@
+using Aoba.RPC;
+using Aoba.RPC.Auth;
+
+using Google.Protobuf.WellKnownTypes;
+
+using Grpc.Core;
+
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.IdentityModel.Tokens;
+
+using System.IdentityModel.Tokens.Jwt;
+
+namespace AobaServer.Services;
+
+public class MetricsRpcService(AuthConfigService authConfig): Aoba.RPC.Metrics.Metrics.MetricsBase
+{
+	[AllowAnonymous]
+	public override async Task<Jwt> GetToken(Empty request, ServerCallContext context)
+	{
+		var authInfo = await authConfig.GetAuthInfoAsync("aoba", "metrics");
+		var handler = new JwtSecurityTokenHandler();
+
+		var jwt = handler.CreateEncodedJwt(new SecurityTokenDescriptor
+		{
+			Audience = authInfo.Audience,
+			Issuer = authInfo.Issuer,
+			IssuedAt = DateTime.UtcNow,
+			SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(authInfo.SecureKey), SecurityAlgorithms.HmacSha256)
+		});
+
+		return new Jwt { Token = jwt };
+	}
+}