Support AutoDetect

MareSynchronosServer/MareSynchronosAuthService/Controllers/DiscoveryController.cs

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+using System.Text.Json.Serialization;
+using MareSynchronosAuthService.Services;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+namespace MareSynchronosAuthService.Controllers;
+
+[Authorize]
+[ApiController]
+[Route("discovery")]
+public class DiscoveryController : Controller
+{
+    private readonly DiscoveryWellKnownProvider _provider;
+    private readonly DiscoveryPresenceService _presence;
+
+    public DiscoveryController(DiscoveryWellKnownProvider provider, DiscoveryPresenceService presence)
+    {
+        _provider = provider;
+        _presence = presence;
+    }
+
+    public sealed class QueryRequest
+    {
+        [JsonPropertyName("hashes")] public string[] Hashes { get; set; } = Array.Empty<string>();
+    }
+
+    public sealed class QueryResponseEntry
+    {
+        [JsonPropertyName("hash")] public string Hash { get; set; } = string.Empty;
+        [JsonPropertyName("token")] public string Token { get; set; } = string.Empty;
+        [JsonPropertyName("displayName")] public string? DisplayName { get; set; }
+    }
+
+    [HttpPost("query")]
+    public IActionResult Query([FromBody] QueryRequest req)
+    {
+        if (_provider.IsExpired())
+        {
+            return BadRequest(new { code = "DISCOVERY_SALT_EXPIRED" });
+        }
+
+        var uid = User?.Claims?.FirstOrDefault(c => c.Type == MareSynchronosShared.Utils.MareClaimTypes.Uid)?.Value ?? string.Empty;
+        if (string.IsNullOrEmpty(uid) || req?.Hashes == null || req.Hashes.Length == 0)
+            return Json(Array.Empty<QueryResponseEntry>());
+
+        List<QueryResponseEntry> matches = new();
+        foreach (var h in req.Hashes.Distinct(StringComparer.Ordinal))
+        {
+            var (found, token, displayName) = _presence.TryMatchAndIssueToken(uid, h);
+            if (found)
+            {
+                matches.Add(new QueryResponseEntry { Hash = h, Token = token, DisplayName = displayName });
+            }
+        }
+
+        return Json(matches);
+    }
+
+    public sealed class RequestDto
+    {
+        [JsonPropertyName("token")] public string Token { get; set; } = string.Empty;
+    }
+
+    [HttpPost("request")]
+    public async Task<IActionResult> RequestPair([FromBody] RequestDto req)
+    {
+        if (string.IsNullOrEmpty(req.Token)) return BadRequest();
+        if (_presence.ValidateToken(req.Token, out var targetUid))
+        {
+            // Phase 3 (minimal): notify target via mare-server internal controller
+            try
+            {
+                var fromUid = User?.Claims?.FirstOrDefault(c => c.Type == MareSynchronosShared.Utils.MareClaimTypes.Uid)?.Value ?? string.Empty;
+                var fromAlias = User?.Claims?.FirstOrDefault(c => c.Type == MareSynchronosShared.Utils.MareClaimTypes.Alias)?.Value ?? string.Empty;
+
+                using var http = new HttpClient();
+                // Use same host as public (goes through nginx)
+                var baseUrl = $"{Request.Scheme}://{Request.Host.Value}";
+                var url = new Uri(new Uri(baseUrl), "/main/discovery/notifyRequest");
+
+                // Generate internal JWT
+                var serverToken = HttpContext.RequestServices.GetRequiredService<MareSynchronosShared.Utils.ServerTokenGenerator>().Token;
+                http.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", serverToken);
+                var payload = System.Text.Json.JsonSerializer.Serialize(new { targetUid, fromUid, fromAlias });
+                var resp = await http.PostAsync(url, new StringContent(payload, System.Text.Encoding.UTF8, "application/json"));
+                // ignore response content, just return Accepted to caller
+            }
+            catch { /* ignore */ }
+
+            return Accepted();
+        }
+        return BadRequest(new { code = "INVALID_TOKEN" });
+    }
+
+    public sealed class PublishRequest
+    {
+        [JsonPropertyName("hashes")] public string[] Hashes { get; set; } = Array.Empty<string>();
+        [JsonPropertyName("displayName")] public string? DisplayName { get; set; }
+    }
+
+    [HttpPost("publish")]
+    public IActionResult Publish([FromBody] PublishRequest req)
+    {
+        if (_provider.IsExpired())
+        {
+            return BadRequest(new { code = "DISCOVERY_SALT_EXPIRED" });
+        }
+        var uid = User?.Claims?.FirstOrDefault(c => c.Type == MareSynchronosShared.Utils.MareClaimTypes.Uid)?.Value ?? string.Empty;
+        if (string.IsNullOrEmpty(uid) || req?.Hashes == null || req.Hashes.Length == 0)
+            return Accepted();
+
+        _presence.Publish(uid, req.Hashes, req.DisplayName);
+        return Accepted();
+    }
+}