init

Foxchat.Core/Database/IDatabaseContext.cs

@@ -0,0 +1,44 @@
+using System.Security.Cryptography;
+using Microsoft.EntityFrameworkCore;
+
+namespace Foxchat.Core.Database;
+
+public abstract class IDatabaseContext : DbContext
+{
+    public virtual DbSet<Instance> Instance { get; set; }
+
+    public async ValueTask<bool> InitializeInstanceAsync(CancellationToken ct = default)
+    {
+        var instance = await Instance.Where(i => i.Id == 1).FirstOrDefaultAsync(ct);
+        if (instance != null) return false;
+
+        var rsa = RSA.Create();
+        var publicKey = rsa.ExportRSAPublicKeyPem();
+        var privateKey = rsa.ExportRSAPrivateKeyPem();
+
+        await Instance.AddAsync(new Instance
+        {
+            PublicKey = publicKey!,
+            PrivateKey = privateKey!,
+        }, ct);
+
+        await SaveChangesAsync(ct);
+        return true;
+    }
+
+    public async Task<Instance> GetInstanceAsync(CancellationToken ct = default)
+    {
+        var instance = await Instance.FirstOrDefaultAsync(ct)
+            ?? throw new Exception("GetInstanceAsync called without Instance being initialized"); // TODO: replace this with specific exception type
+        return instance;
+    }
+
+    public async Task<RSA> GetInstanceKeysAsync(CancellationToken ct = default)
+    {
+        var instance = await GetInstanceAsync(ct);
+
+        var rsa = RSA.Create();
+        rsa.ImportFromPem(instance.PrivateKey);
+        return rsa;
+    }
+}

Foxchat.Core/Database/Instance.cs

@@ -0,0 +1,8 @@
+namespace Foxchat.Core.Database;
+
+public class Instance
+{
+    public int Id { get; init; }
+    public string PublicKey { get; set; } = null!;
+    public string PrivateKey { get; set; } = null!;
+}