me-web? 0.2: the test from outside, calls and games, mail, and what you can host

Phases two and three ship together, because their code grew in the same
files. With consent the app asks the router to open 80, 443 and a high
port for ten minutes (UPnP, NAT-PMP or PCP), and the server, holding a
single-use ticket bound to the caller's own address, connects back and
must get an HMAC only the app can give; the mappings are removed after the
run and remembered until then, so a crash cannot leave one open. Hairpin
is tried from inside. Two STUN servers, the outside one first, tell easy
from hard NAT.

Mail gets port 25 to Gmail and Outlook, the reverse name and five
blocklists through the user's own resolver, network-wide UCEPROTECT
listings counted as a caution. DNS, speed against the server (four at a
time, twelve an hour per address) and the device follow, and six uses
(website, home from outside, files, game server, fediverse, mail) close
the run as possible, possible with a named workaround, or can't tell.

Findings can be shared after reading the exact JSON: a file per submission
under the unit's state directory, ten a day per address, deletable by the
token the app keeps, swept after twelve months; /privacy says all of it in
English and Italian. QR codes lead to the downloads. Every language carries
every string.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

src/MeWeb.Core/Checks/ServerProbe.cs

@@ -56,6 +56,64 @@ public class ServerProbe(HttpClient https, HttpClient plain)
     }
   }
 
+  public async Task<(ViewProbeTicket Ticket, ViewRefusal Refusal)> Ticket(bool v6, CancellationToken ct)
+  {
+    var origin = v6 ? Endpoints.BaseV6 : Endpoints.BaseV4;
+    return await Send(HttpMethod.Post, origin + Endpoints.Probe.POST_Ticket, null, MeWebJsonContext.Default.ViewProbeTicket, ct);
+  }
+
+  public async Task<(ViewProbe Probe, ViewRefusal Refusal)> Knock(bool v6, string id, List<int> ports, CancellationToken ct)
+  {
+    var origin = v6 ? Endpoints.BaseV6 : Endpoints.BaseV4;
+    var form = JsonContent.Create(new ProbeForm { Ports = ports }, MeWebJsonContext.Default.ProbeForm);
+    return await Send(HttpMethod.Post, origin + Endpoints.Probe.POST_M_Run(id), form, MeWebJsonContext.Default.ViewProbe, ct, TimeSpan.FromSeconds(30));
+  }
+
+  public async Task<(ViewShared Shared, ViewRefusal Refusal)> Share(string json, CancellationToken ct)
+  {
+    var content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");
+    return await Send(HttpMethod.Post, Endpoints.Base + Endpoints.Share.POST_Create, content, MeWebJsonContext.Default.ViewShared, ct);
+  }
+
+  public async Task<bool> Unshare(string id, string token, CancellationToken ct)
+  {
+    try
+    {
+      using var request = new HttpRequestMessage(HttpMethod.Delete, Endpoints.Base + Endpoints.Share.DELETE_M_One(id));
+      request.Headers.TryAddWithoutValidation(DeleteTokenHeader, token);
+      using var timeout = CancellationTokenSource.CreateLinkedTokenSource(ct);
+      timeout.CancelAfter(Patience);
+      using var response = await https.SendAsync(request, timeout.Token);
+      return response.IsSuccessStatusCode || response.StatusCode == HttpStatusCode.NotFound;
+    }
+    catch (Exception ex) when (ex is HttpRequestException or TaskCanceledException && !ct.IsCancellationRequested)
+    {
+      return false;
+    }
+  }
+
+  public const string DeleteTokenHeader = "X-Delete-Token";
+
+  async Task<(T Value, ViewRefusal Refusal)> Send<T>(HttpMethod method, string url, HttpContent content, System.Text.Json.Serialization.Metadata.JsonTypeInfo<T> type, CancellationToken ct, TimeSpan? patience = null) where T : class
+  {
+    try
+    {
+      using var request = new HttpRequestMessage(method, url) { Content = content };
+      using var timeout = CancellationTokenSource.CreateLinkedTokenSource(ct);
+      timeout.CancelAfter(patience ?? Patience);
+      using var response = await https.SendAsync(request, timeout.Token);
+      if (response.IsSuccessStatusCode) return (await response.Content.ReadFromJsonAsync(type, timeout.Token), null);
+      var refusal = response.Content.Headers.ContentType?.MediaType == "application/json"
+        ? await response.Content.ReadFromJsonAsync(MeWebJsonContext.Default.ViewRefusal, timeout.Token)
+        : null;
+      return (null, refusal ?? new ViewRefusal { Reason = $"http-{(int)response.StatusCode}" });
+    }
+    catch (Exception ex) when (ex is HttpRequestException or TaskCanceledException or System.Text.Json.JsonException && !ct.IsCancellationRequested)
+    {
+      return (null, new ViewRefusal { Reason = "unreachable" });
+    }
+  }
+
   public static async Task<IPAddress> ResolveV4(CancellationToken ct)
   {
     try