init

Foxchat.Identity/Services/ChatInstanceResolverService.cs

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+using Foxchat.Core.Federation;
+using Foxchat.Core.Models;
+using Foxchat.Identity.Database;
+using Foxchat.Identity.Database.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace Foxchat.Identity.Services;
+
+public class ChatInstanceResolverService(ILogger logger, RequestSigningService requestSigningService, IdentityContext context, InstanceConfig config)
+{
+    private readonly ILogger _logger = logger.ForContext<ChatInstanceResolverService>();
+
+    public async Task<ChatInstance> ResolveChatInstanceAsync(string domain)
+    {
+        var instance = await context.ChatInstances.Where(c => c.Domain == domain).FirstOrDefaultAsync();
+        if (instance != null) return instance;
+
+        _logger.Information("Unknown chat instance {Domain}, fetching its data", domain);
+
+        var resp = await requestSigningService.RequestAsync<HelloResponse>(
+            HttpMethod.Post,
+            domain, "/_fox/chat/hello",
+            userId: null,
+            body: new HelloRequest(config.Domain)
+        );
+
+        instance = new ChatInstance
+        {
+            Domain = domain,
+            BaseUrl = $"https://{domain}",
+            PublicKey = resp.PublicKey,
+            Status = ChatInstance.InstanceStatus.Active,
+        };
+        await context.AddAsync(instance);
+        await context.SaveChangesAsync();
+
+        return instance;
+    }
+}