Add AkariApi gRPC service

Akari.Prototype.Server/Services/AkariService.cs

@@ -0,0 +1,89 @@
+using Akari.Prototype.Protos;
+using Akari.Prototype.Server.Services;
+using Akari.Prototype.Server.Utils;
+using Google.Protobuf;
+using Grpc.Core;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Akari.Prototype.Server
+{
+    public class AkariService : AkariApi.AkariApiBase
+    {
+        private readonly ILogger<AkariService> _logger;
+        private readonly IApplicationsManager _applications;
+
+        public AkariService(ILogger<AkariService> logger, IApplicationsManager applications)
+        {
+            _logger = logger;
+            _applications = applications;
+        }
+
+        public override Task<DecryptResponse> Decrypt(DecryptRequest request, ServerCallContext context)
+        {
+            if (!_applications.Contains(request.Application))
+            {
+                return Task.FromResult(new DecryptResponse()
+                {
+                    ErrorMessage = "Application not found"
+                });
+            }
+
+            if (!_applications.VerifyToken(request.Application, request.Token))
+            {
+                return Task.FromResult(new DecryptResponse()
+                {
+                    ErrorMessage = "Wrong token"
+                });
+            }
+
+            if (_applications.TryRetrieveKey(request.Application, request.Token, out var key))
+            {
+                return Task.FromResult(new DecryptResponse()
+                {
+                    Plain = ByteString.CopyFrom(Security.AesGcmDecrypt(key, request.Encrypted.ToByteArray()))
+                });
+            }
+
+            return Task.FromResult(new DecryptResponse()
+            {
+                ErrorMessage = "No fingerprint auth found for this application"
+            });
+        }
+
+        public override Task<EncryptResponse> Encrypt(EncryptRequest request, ServerCallContext context)
+        {
+            if (!_applications.Contains(request.Application))
+            {
+                return Task.FromResult(new EncryptResponse()
+                {
+                    ErrorMessage = "Application not found"
+                });
+            }
+
+            if (!_applications.VerifyToken(request.Application, request.Token))
+            {
+                return Task.FromResult(new EncryptResponse()
+                {
+                    ErrorMessage = "Wrong token"
+                });
+            }
+
+            if (_applications.TryRetrieveKey(request.Application, request.Token, out var key))
+            {
+                return Task.FromResult(new EncryptResponse()
+                {
+                    Encrypted = ByteString.CopyFrom(Security.AesGcmEncrypt(key, request.Plain.ToByteArray()))
+                });
+            }
+
+            return Task.FromResult(new EncryptResponse()
+            {
+                ErrorMessage = "No fingerprint auth found for this application"
+            });
+        }
+    }
+}