CDNs found by themselves, and servers followed through time

PrivaPub now finds CDNs three ways, best first: the address ranges the
CDNs publish (Cloudflare, Fastly, Amazon CloudFront, Bunny, Gcore,
Imperva), downloaded daily by CdnUpdater and kept in CdnRangeSet; the
CDN's fingerprint in the responses it already gets from a server
(EdgeHintsHandler on the federation client); and the networks that carry
only a CDN. The fixed ASN list is gone; ASNs shared with plain hosting
(AWS, DataPacket) no longer hide a server. A server's Geo records the
CDN, its domain and how it was found, and weekly snapshots now keep the
city and coordinates too.

Servers through time (ServerPlaces): /instances/:host/history lists a
server's weekly snapshots, a CDN-fronted server's geo names the CDN's
domain and where the server was before it (before_cdn), and
/api/privapub/v1/cdns and /cdns/:domain group servers by CDN with week
by week who joined and who left. Owner decisions recorded in ROADMAP.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Domain/Statistics/SelfLocation.cs

@@ -24,6 +24,7 @@ namespace PrivaPub.Domain.Statistics
 		static readonly TimeSpan Lifetime = TimeSpan.FromDays(1);
 
 		readonly IGeoLocator _geo;
+		readonly ICdnRanges _cdnRanges;
 		readonly IOptionsMonitor<StatisticsOptions> _options;
 		readonly IOptionsMonitor<AppConfiguration> _app;
 		readonly ILogger<SelfLocation> _logger;
@@ -32,9 +33,11 @@ namespace PrivaPub.Domain.Statistics
 		InstanceGeo _located;
 		DateTime _locatedAt = DateTime.MinValue;
 
-		public SelfLocation(IGeoLocator geo, IOptionsMonitor<StatisticsOptions> options, IOptionsMonitor<AppConfiguration> app, ILogger<SelfLocation> logger)
+		public SelfLocation(IGeoLocator geo, IOptionsMonitor<StatisticsOptions> options, IOptionsMonitor<AppConfiguration> app, ILogger<SelfLocation> logger,
+			ICdnRanges cdnRanges = default)
 		{
 			_geo = geo;
+			_cdnRanges = cdnRanges;
 			_options = options;
 			_app = app;
 			_logger = logger;
@@ -79,6 +82,7 @@ namespace PrivaPub.Domain.Statistics
 				var addresses = await Dns.GetHostAddressesAsync(self.Host, token);
 				var address = addresses.FirstOrDefault(a => a.AddressFamily == AddressFamily.InterNetwork) ?? addresses.FirstOrDefault();
 				var fix = address == default ? default : _geo.Locate(address);
+				var (cdn, cdnSource) = Federation.Objects.InstanceDescriber.Cdn(address, self.Host, fix?.Asn, _cdnRanges, default);
 				return fix == default ? default : new InstanceGeo
 				{
 					Country = fix.Country,
@@ -87,7 +91,9 @@ namespace PrivaPub.Domain.Statistics
 					Longitude = fix.Longitude,
 					Asn = fix.Asn,
 					AsnOrg = fix.AsnOrg,
-					Cdn = CdnNetworks.Of(fix.Asn),
+					Cdn = cdn?.Name,
+					CdnDomain = cdn?.Domain,
+					CdnSource = cdnSource,
 					Ipv6 = address.AddressFamily == AddressFamily.InterNetworkV6,
 					Source = _geo.Source,
 					LocatedAt = DateTime.UtcNow