Add signevent to nip86

nip86/methods.go

@@ -330,6 +330,32 @@ func DecodeRequest(req Request) (MethodParams, error) {
 			return nil, fmt.Errorf("missing role id param for '%s'", req.Method)
 		}
 		return UnassignRole{pk, roleID}, nil
+	case "signevent":
+		if len(req.Params) == 0 {
+			return nil, fmt.Errorf("invalid number of params for '%s'", req.Method)
+		}
+		tmpl, ok := req.Params[0].(map[string]any)
+		if !ok {
+			return nil, fmt.Errorf("missing event param for '%s'", req.Method)
+		}
+		kind, ok := tmpl["kind"].(float64)
+		if !ok || math.Trunc(kind) != kind {
+			return nil, fmt.Errorf("invalid kind '%v' for '%s'", tmpl["kind"], req.Method)
+		}
+		var createdAt nostr.Timestamp
+		if ca, ok := tmpl["created_at"]; ok {
+			caf, ok := ca.(float64)
+			if !ok || math.Trunc(caf) != caf {
+				return nil, fmt.Errorf("invalid created_at '%v' for '%s'", ca, req.Method)
+			}
+			createdAt = nostr.Timestamp(caf)
+		}
+		tags, err := coerceTags(tmpl["tags"])
+		if err != nil {
+			return nil, fmt.Errorf("invalid tags for '%s': %w", req.Method, err)
+		}
+		content, _ := tmpl["content"].(string)
+		return SignEvent{nostr.Kind(kind), createdAt, tags, content}, nil
 	case "stats":
 		return Stats{}, nil
 	default:
@@ -350,6 +376,35 @@ func coerceInt(v any) int {
 	return 0
 }
 
+// coerceTags converts a decoded JSON value (an array of arrays of strings) into
+// nostr.Tags. A nil value yields nil tags; any other shape is an error.
+func coerceTags(v any) (nostr.Tags, error) {
+	if v == nil {
+		return nil, nil
+	}
+	rawTags, ok := v.([]any)
+	if !ok {
+		return nil, fmt.Errorf("tags must be an array")
+	}
+	tags := make(nostr.Tags, len(rawTags))
+	for i, rt := range rawTags {
+		rawTag, ok := rt.([]any)
+		if !ok {
+			return nil, fmt.Errorf("tag %d must be an array", i)
+		}
+		tag := make(nostr.Tag, len(rawTag))
+		for j, el := range rawTag {
+			s, ok := el.(string)
+			if !ok {
+				return nil, fmt.Errorf("tag %d element %d must be a string", i, j)
+			}
+			tag[j] = s
+		}
+		tags[i] = tag
+	}
+	return tags, nil
+}
+
 type MethodParams interface {
 	MethodName() string
 }
@@ -384,6 +439,7 @@ var (
 	_ MethodParams = (*DeleteRole)(nil)
 	_ MethodParams = (*AssignRole)(nil)
 	_ MethodParams = (*UnassignRole)(nil)
+	_ MethodParams = (*SignEvent)(nil)
 	_ MethodParams = (*Stats)(nil)
 )
 
@@ -563,6 +619,15 @@ type UnassignRole struct {
 
 func (UnassignRole) MethodName() string { return "unassignrole" }
 
+type SignEvent struct {
+	Kind      nostr.Kind
+	CreatedAt nostr.Timestamp
+	Tags      nostr.Tags
+	Content   string
+}
+
+func (SignEvent) MethodName() string { return "signevent" }
+
 type Stats struct{}
 
 func (Stats) MethodName() string { return "stats" }