wip passkey registration

AobaServer/Services/AccountRpcService.cs

@@ -1,20 +1,47 @@
 using Aoba.RPC;
 using Aoba.RPC.Account;
 
+using AobaCore.Services;
+
+using AobaServer.Utils;
+
+using Fido2NetLib;
+
 using Google.Protobuf.WellKnownTypes;
 
 using Grpc.Core;
 
+using Isopoh.Cryptography.Argon2;
+
 namespace AobaServer.Services;
 
-public class AccountRpcService : AccountRpc.AccountRpcBase
+public class AccountRpcService(IFido2 fido2, AccountsService accounts) : AccountRpc.AccountRpcBase
 {
-	public override Task<PasskeyRegistrationCreds> RegisterPasskey(Empty request, ServerCallContext context)
+	public override async Task<PasskeyCredentialCreateOptions> RegisterPasskey(Empty request, ServerCallContext context)
 	{
-		return base.RegisterPasskey(request, context);
+		var curUser = await accounts.GetUserAsync(context.GetUserId(), context.CancellationToken);
+		if (curUser == null)
+			throw new Exception($"Logged in user does not exist somehow. Id: {context.GetUserId()}");
+		var user = new Fido2User
+		{
+			DisplayName = curUser.Username,
+			Id = curUser.Id.ToByteArray(),
+			Name = curUser.Username
+		};
+
+		var credOptions = fido2.RequestNewCredential(new RequestNewCredentialParams
+		{
+			User = user,
+			ExcludeCredentials = curUser.CredentialDescriptors
+		});
+		return new PasskeyCredentialCreateOptions
+		{
+			Challenge = credOptions.Challenge.ToB64String().Replace('+', '-').Replace('/', '_'),
+			UserId = credOptions.User.Id.ToB64String().Replace('+', '-').Replace('/', '_')
+		};
 	}
 
-	public override Task<Empty> CompletePasskeyRegistration(PasskeyPublicKey request, ServerCallContext context)
+	public override Task<Empty> CompletePasskeyRegistration(PasskeyRegistrationCredentials request, ServerCallContext context)
 	{
 		return base.CompletePasskeyRegistration(request, context);
 	}