sdk taking shape.

sdk/metadata.go

@@ -0,0 +1,50 @@
+package sdk
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/nbd-wtf/go-nostr"
+	"github.com/nbd-wtf/go-nostr/nip19"
+)
+
+type ProfileMetadata struct {
+	pubkey string
+
+	Name        string `json:"name,omitempty"`
+	DisplayName string `json:"display_name,omitempty"`
+	About       string `json:"about,omitempty"`
+	Website     string `json:"website,omitempty"`
+	Picture     string `json:"picture,omitempty"`
+	Banner      string `json:"banner,omitempty"`
+	NIP05       string `json:"nip05,omitempty"`
+	LUD16       string `json:"lud16,omitempty"`
+}
+
+func (p ProfileMetadata) Npub() string {
+	v, _ := nip19.EncodePublicKey(p.pubkey)
+	return v
+}
+
+func (p ProfileMetadata) Nprofile(ctx context.Context, sys *System, nrelays int) string {
+	v, _ := nip19.EncodeProfile(p.pubkey, sys.FetchOutboxRelaysForPubkey(ctx, p.pubkey))
+	return v
+}
+
+func ParseMetadata(event *nostr.Event) (*ProfileMetadata, error) {
+	if event.Kind != 0 {
+		return nil, fmt.Errorf("event %s is kind %d, not 0", event.ID, event.Kind)
+	}
+
+	var meta ProfileMetadata
+	if err := json.Unmarshal([]byte(event.Content), &meta); err != nil {
+		cont := event.Content
+		if len(cont) > 100 {
+			cont = cont[0:99]
+		}
+		return nil, fmt.Errorf("failed to parse metadata (%s) from event %s: %w", cont, event.ID, err)
+	}
+
+	return &meta, nil
+}