move nostr-sdk repository into here because why not?

sdk/tracker.go

@@ -0,0 +1,86 @@
+package sdk
+
+import (
+	"net/url"
+
+	"github.com/nbd-wtf/go-nostr"
+	"github.com/nbd-wtf/go-nostr/sdk/hints"
+)
+
+func (sys *System) trackEventHints(ie nostr.IncomingEvent) {
+	if IsVirtualRelay(ie.Relay.URL) {
+		return
+	}
+
+	switch ie.Kind {
+	case nostr.KindRelayListMetadata:
+		for _, tag := range ie.Tags {
+			if len(tag) < 2 || tag[0] != "r" {
+				continue
+			}
+			if len(tag) == 2 || (tag[2] == "" || tag[2] == "write") {
+				sys.Hints.Save(ie.PubKey, tag[1], hints.LastInRelayList, ie.CreatedAt)
+			}
+		}
+	case nostr.KindContactList:
+		sys.Hints.Save(ie.PubKey, ie.Relay.URL, hints.MostRecentEventFetched, ie.CreatedAt)
+
+		for _, tag := range ie.Tags {
+			if len(tag) < 3 {
+				continue
+			}
+			if IsVirtualRelay(tag[2]) {
+				continue
+			}
+			if p, err := url.Parse(tag[2]); err != nil || (p.Scheme != "wss" && p.Scheme != "ws") {
+				continue
+			}
+			if tag[0] == "p" && nostr.IsValidPublicKey(tag[1]) {
+				sys.Hints.Save(tag[1], tag[2], hints.LastInTag, ie.CreatedAt)
+			}
+		}
+	case nostr.KindTextNote:
+		sys.Hints.Save(ie.PubKey, ie.Relay.URL, hints.MostRecentEventFetched, ie.CreatedAt)
+
+		for _, tag := range ie.Tags {
+			if len(tag) < 3 {
+				continue
+			}
+			if IsVirtualRelay(tag[2]) {
+				continue
+			}
+			if p, err := url.Parse(tag[2]); err != nil || (p.Scheme != "wss" && p.Scheme != "ws") {
+				continue
+			}
+			if tag[0] == "p" && nostr.IsValidPublicKey(tag[1]) {
+				sys.Hints.Save(tag[1], tag[2], hints.LastInTag, ie.CreatedAt)
+			}
+		}
+
+		for _, ref := range ParseReferences(ie.Event) {
+			if ref.Profile != nil {
+				for _, relay := range ref.Profile.Relays {
+					if IsVirtualRelay(relay) {
+						continue
+					}
+					if p, err := url.Parse(relay); err != nil || (p.Scheme != "wss" && p.Scheme != "ws") {
+						continue
+					}
+					if nostr.IsValidPublicKey(ref.Profile.PublicKey) {
+						sys.Hints.Save(ref.Profile.PublicKey, relay, hints.LastInNprofile, ie.CreatedAt)
+					}
+				}
+			} else if ref.Event != nil && nostr.IsValidPublicKey(ref.Event.Author) {
+				for _, relay := range ref.Event.Relays {
+					if IsVirtualRelay(relay) {
+						continue
+					}
+					if p, err := url.Parse(relay); err != nil || (p.Scheme != "wss" && p.Scheme != "ws") {
+						continue
+					}
+					sys.Hints.Save(ref.Event.Author, relay, hints.LastInNevent, ie.CreatedAt)
+				}
+			}
+		}
+	}
+}