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package nostr
import (
"encoding/json"
"fmt"
)
// Envelope represents a Nostr protocol message.
type Envelope interface {
Label() string
MarshalJSON() ([]byte, error)
}
// EventEnvelope wraps an event for the EVENT message.
// Used both client→relay (publish) and relay→client (subscription).
type EventEnvelope struct {
SubscriptionID string // Only for relay→client messages
Event *Event
}
func (e EventEnvelope) Label() string { return "EVENT" }
func (e EventEnvelope) MarshalJSON() ([]byte, error) {
if e.SubscriptionID != "" {
return json.Marshal([]interface{}{"EVENT", e.SubscriptionID, e.Event})
}
return json.Marshal([]interface{}{"EVENT", e.Event})
}
// ReqEnvelope represents a REQ message (client→relay).
type ReqEnvelope struct {
SubscriptionID string
Filters []Filter
}
func (e ReqEnvelope) Label() string { return "REQ" }
func (e ReqEnvelope) MarshalJSON() ([]byte, error) {
arr := make([]interface{}, 2+len(e.Filters))
arr[0] = "REQ"
arr[1] = e.SubscriptionID
for i, f := range e.Filters {
arr[2+i] = f
}
return json.Marshal(arr)
}
// CloseEnvelope represents a CLOSE message (client→relay).
type CloseEnvelope struct {
SubscriptionID string
}
func (e CloseEnvelope) Label() string { return "CLOSE" }
func (e CloseEnvelope) MarshalJSON() ([]byte, error) {
return json.Marshal([]interface{}{"CLOSE", e.SubscriptionID})
}
// OKEnvelope represents an OK message (relay→client).
type OKEnvelope struct {
EventID string
OK bool
Message string
}
func (e OKEnvelope) Label() string { return "OK" }
func (e OKEnvelope) MarshalJSON() ([]byte, error) {
return json.Marshal([]interface{}{"OK", e.EventID, e.OK, e.Message})
}
// EOSEEnvelope represents an EOSE (End of Stored Events) message (relay→client).
type EOSEEnvelope struct {
SubscriptionID string
}
func (e EOSEEnvelope) Label() string { return "EOSE" }
func (e EOSEEnvelope) MarshalJSON() ([]byte, error) {
return json.Marshal([]interface{}{"EOSE", e.SubscriptionID})
}
// ClosedEnvelope represents a CLOSED message (relay→client).
type ClosedEnvelope struct {
SubscriptionID string
Message string
}
func (e ClosedEnvelope) Label() string { return "CLOSED" }
func (e ClosedEnvelope) MarshalJSON() ([]byte, error) {
return json.Marshal([]interface{}{"CLOSED", e.SubscriptionID, e.Message})
}
// NoticeEnvelope represents a NOTICE message (relay→client).
type NoticeEnvelope struct {
Message string
}
func (e NoticeEnvelope) Label() string { return "NOTICE" }
func (e NoticeEnvelope) MarshalJSON() ([]byte, error) {
return json.Marshal([]interface{}{"NOTICE", e.Message})
}
// ParseEnvelope parses a raw JSON message into the appropriate envelope type.
func ParseEnvelope(data []byte) (Envelope, error) {
var arr []json.RawMessage
if err := json.Unmarshal(data, &arr); err != nil {
return nil, fmt.Errorf("invalid envelope: %w", err)
}
if len(arr) < 2 {
return nil, fmt.Errorf("envelope too short")
}
var label string
if err := json.Unmarshal(arr[0], &label); err != nil {
return nil, fmt.Errorf("invalid envelope label: %w", err)
}
switch label {
case "EVENT":
return parseEventEnvelope(arr)
case "REQ":
return parseReqEnvelope(arr)
case "CLOSE":
return parseCloseEnvelope(arr)
case "OK":
return parseOKEnvelope(arr)
case "EOSE":
return parseEOSEEnvelope(arr)
case "CLOSED":
return parseClosedEnvelope(arr)
case "NOTICE":
return parseNoticeEnvelope(arr)
default:
return nil, fmt.Errorf("unknown envelope type: %s", label)
}
}
func parseEventEnvelope(arr []json.RawMessage) (*EventEnvelope, error) {
env := &EventEnvelope{}
if len(arr) == 2 {
// Client→relay: ["EVENT", event]
var event Event
if err := json.Unmarshal(arr[1], &event); err != nil {
return nil, fmt.Errorf("invalid event: %w", err)
}
env.Event = &event
} else if len(arr) == 3 {
// Relay→client: ["EVENT", subscription_id, event]
if err := json.Unmarshal(arr[1], &env.SubscriptionID); err != nil {
return nil, fmt.Errorf("invalid subscription ID: %w", err)
}
var event Event
if err := json.Unmarshal(arr[2], &event); err != nil {
return nil, fmt.Errorf("invalid event: %w", err)
}
env.Event = &event
} else {
return nil, fmt.Errorf("invalid EVENT envelope length: %d", len(arr))
}
return env, nil
}
func parseReqEnvelope(arr []json.RawMessage) (*ReqEnvelope, error) {
if len(arr) < 3 {
return nil, fmt.Errorf("REQ envelope must have at least 3 elements")
}
env := &ReqEnvelope{}
if err := json.Unmarshal(arr[1], &env.SubscriptionID); err != nil {
return nil, fmt.Errorf("invalid subscription ID: %w", err)
}
for i := 2; i < len(arr); i++ {
var filter Filter
if err := json.Unmarshal(arr[i], &filter); err != nil {
return nil, fmt.Errorf("invalid filter at index %d: %w", i-2, err)
}
env.Filters = append(env.Filters, filter)
}
return env, nil
}
func parseCloseEnvelope(arr []json.RawMessage) (*CloseEnvelope, error) {
if len(arr) != 2 {
return nil, fmt.Errorf("CLOSE envelope must have exactly 2 elements")
}
env := &CloseEnvelope{}
if err := json.Unmarshal(arr[1], &env.SubscriptionID); err != nil {
return nil, fmt.Errorf("invalid subscription ID: %w", err)
}
return env, nil
}
func parseOKEnvelope(arr []json.RawMessage) (*OKEnvelope, error) {
if len(arr) != 4 {
return nil, fmt.Errorf("OK envelope must have exactly 4 elements")
}
env := &OKEnvelope{}
if err := json.Unmarshal(arr[1], &env.EventID); err != nil {
return nil, fmt.Errorf("invalid event ID: %w", err)
}
if err := json.Unmarshal(arr[2], &env.OK); err != nil {
return nil, fmt.Errorf("invalid OK status: %w", err)
}
if err := json.Unmarshal(arr[3], &env.Message); err != nil {
return nil, fmt.Errorf("invalid message: %w", err)
}
return env, nil
}
func parseEOSEEnvelope(arr []json.RawMessage) (*EOSEEnvelope, error) {
if len(arr) != 2 {
return nil, fmt.Errorf("EOSE envelope must have exactly 2 elements")
}
env := &EOSEEnvelope{}
if err := json.Unmarshal(arr[1], &env.SubscriptionID); err != nil {
return nil, fmt.Errorf("invalid subscription ID: %w", err)
}
return env, nil
}
func parseClosedEnvelope(arr []json.RawMessage) (*ClosedEnvelope, error) {
if len(arr) != 3 {
return nil, fmt.Errorf("CLOSED envelope must have exactly 3 elements")
}
env := &ClosedEnvelope{}
if err := json.Unmarshal(arr[1], &env.SubscriptionID); err != nil {
return nil, fmt.Errorf("invalid subscription ID: %w", err)
}
if err := json.Unmarshal(arr[2], &env.Message); err != nil {
return nil, fmt.Errorf("invalid message: %w", err)
}
return env, nil
}
func parseNoticeEnvelope(arr []json.RawMessage) (*NoticeEnvelope, error) {
if len(arr) != 2 {
return nil, fmt.Errorf("NOTICE envelope must have exactly 2 elements")
}
env := &NoticeEnvelope{}
if err := json.Unmarshal(arr[1], &env.Message); err != nil {
return nil, fmt.Errorf("invalid message: %w", err)
}
return env, nil
}
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