move nostr-sdk repository into here because why not?

sdk/input.go

@@ -0,0 +1,65 @@
+package sdk
+
+import (
+	"context"
+	"encoding/hex"
+
+	"github.com/nbd-wtf/go-nostr"
+	"github.com/nbd-wtf/go-nostr/nip05"
+	"github.com/nbd-wtf/go-nostr/nip19"
+)
+
+// InputToProfile turns any npub/nprofile/hex/nip05 input into a ProfilePointer (or nil).
+func InputToProfile(ctx context.Context, input string) *nostr.ProfilePointer {
+	// handle if it is a hex string
+	if len(input) == 64 {
+		if _, err := hex.DecodeString(input); err == nil {
+			return &nostr.ProfilePointer{PublicKey: input}
+		}
+	}
+
+	// handle nip19 codes, if that's the case
+	prefix, data, _ := nip19.Decode(input)
+	switch prefix {
+	case "npub":
+		input = data.(string)
+		return &nostr.ProfilePointer{PublicKey: input}
+	case "nprofile":
+		pp := data.(nostr.ProfilePointer)
+		return &pp
+	}
+
+	// handle nip05 ids, if that's the case
+	pp, _ := nip05.QueryIdentifier(ctx, input)
+	if pp != nil {
+		return pp
+	}
+
+	return nil
+}
+
+// InputToEventPointer turns any note/nevent/hex input into a EventPointer (or nil).
+func InputToEventPointer(input string) *nostr.EventPointer {
+	// handle if it is a hex string
+	if len(input) == 64 {
+		if _, err := hex.DecodeString(input); err == nil {
+			return &nostr.EventPointer{ID: input}
+		}
+	}
+
+	// handle nip19 codes, if that's the case
+	prefix, data, _ := nip19.Decode(input)
+	switch prefix {
+	case "note":
+		if input, ok := data.(string); ok {
+			return &nostr.EventPointer{ID: input}
+		}
+	case "nevent":
+		if ep, ok := data.(nostr.EventPointer); ok {
+			return &ep
+		}
+	}
+
+	// handle nip05 ids, if that's the case
+	return nil
+}