Added some NIP-42 functionality to the client (relay.go) (#38)

nip42/nip42.go

@@ -7,6 +7,23 @@ import (
 	"github.com/nbd-wtf/go-nostr"
 )
 
+// CreateUnsignedAuthEvent creates an event which should be sent via an "AUTH" command.
+// If the authentication succeeds, the user will be authenticated as pubkey.
+func CreateUnsignedAuthEvent(challenge, pubkey, relayURL string) nostr.Event {
+	return nostr.Event{
+		PubKey:    pubkey,
+		CreatedAt: time.Now(),
+		Kind:      22242,
+		Tags: nostr.Tags{
+			nostr.Tag{"relay", relayURL},
+			nostr.Tag{"challenge", challenge},
+		},
+		Content: "",
+	}
+}
+
+// ValidateAuthEvent checks whether event is a valid NIP-42 event for given challenge and relayURL.
+// The result of the validation is encoded in the ok bool.
 func ValidateAuthEvent(event *nostr.Event, challenge string, relayURL string) (pubkey string, ok bool) {
 	if ok, _ := event.CheckSignature(); ok == false {
 		return "", false