392 lines
11 KiB
Go
392 lines
11 KiB
Go
package khatru
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"net/http"
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"strings"
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"sync"
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"time"
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"github.com/bep/debounce"
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"github.com/fasthttp/websocket"
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"github.com/nbd-wtf/go-nostr"
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"github.com/nbd-wtf/go-nostr/nip42"
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"github.com/nbd-wtf/go-nostr/nip77"
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"github.com/nbd-wtf/go-nostr/nip77/negentropy"
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"github.com/puzpuzpuz/xsync/v3"
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"github.com/rs/cors"
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)
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// ServeHTTP implements http.Handler interface.
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func (rl *Relay) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if rl.ServiceURL == "" {
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rl.ServiceURL = getServiceBaseURL(r)
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}
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corsMiddleware := cors.New(cors.Options{
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AllowedOrigins: []string{"*"},
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AllowedMethods: []string{
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http.MethodHead,
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http.MethodGet,
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http.MethodPost,
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http.MethodPut,
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http.MethodPatch,
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http.MethodDelete,
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},
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AllowedHeaders: []string{"Authorization", "*"},
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MaxAge: 86400,
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})
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if r.Header.Get("Upgrade") == "websocket" {
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rl.HandleWebsocket(w, r)
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} else if r.Header.Get("Accept") == "application/nostr+json" {
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corsMiddleware.Handler(http.HandlerFunc(rl.HandleNIP11)).ServeHTTP(w, r)
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} else if r.Header.Get("Content-Type") == "application/nostr+json+rpc" {
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corsMiddleware.Handler(http.HandlerFunc(rl.HandleNIP86)).ServeHTTP(w, r)
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} else {
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corsMiddleware.Handler(rl.serveMux).ServeHTTP(w, r)
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}
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}
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func (rl *Relay) HandleWebsocket(w http.ResponseWriter, r *http.Request) {
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for _, reject := range rl.RejectConnection {
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if reject(r) {
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w.WriteHeader(429) // Too many requests
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return
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}
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}
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conn, err := rl.upgrader.Upgrade(w, r, nil)
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if err != nil {
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rl.Log.Printf("failed to upgrade websocket: %v\n", err)
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return
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}
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ticker := time.NewTicker(rl.PingPeriod)
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// NIP-42 challenge
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challenge := make([]byte, 8)
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rand.Read(challenge)
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ws := &WebSocket{
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conn: conn,
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Request: r,
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Challenge: hex.EncodeToString(challenge),
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negentropySessions: xsync.NewMapOf[string, *NegentropySession](),
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}
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ws.Context, ws.cancel = context.WithCancel(context.Background())
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rl.clientsMutex.Lock()
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rl.clients[ws] = make([]listenerSpec, 0, 2)
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rl.clientsMutex.Unlock()
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ctx, cancel := context.WithCancel(
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context.WithValue(
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context.Background(),
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wsKey, ws,
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),
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)
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kill := func() {
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for _, ondisconnect := range rl.OnDisconnect {
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ondisconnect(ctx)
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}
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ticker.Stop()
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cancel()
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ws.cancel()
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ws.conn.Close()
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rl.removeClientAndListeners(ws)
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}
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go func() {
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defer kill()
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ws.conn.SetReadLimit(rl.MaxMessageSize)
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ws.conn.SetReadDeadline(time.Now().Add(rl.PongWait))
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ws.conn.SetPongHandler(func(string) error {
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ws.conn.SetReadDeadline(time.Now().Add(rl.PongWait))
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return nil
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})
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for _, onconnect := range rl.OnConnect {
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onconnect(ctx)
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}
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for {
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typ, message, err := ws.conn.ReadMessage()
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if err != nil {
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if websocket.IsUnexpectedCloseError(
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err,
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websocket.CloseNormalClosure, // 1000
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websocket.CloseGoingAway, // 1001
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websocket.CloseNoStatusReceived, // 1005
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websocket.CloseAbnormalClosure, // 1006
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4537, // some client seems to send many of these
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) {
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rl.Log.Printf("unexpected close error from %s: %v\n", r.Header.Get("X-Forwarded-For"), err)
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}
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ws.cancel()
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return
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}
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if typ == websocket.PingMessage {
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ws.WriteMessage(websocket.PongMessage, nil)
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continue
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}
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go func(message []byte) {
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envelope := nostr.ParseMessage(message)
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if envelope == nil {
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if !rl.Negentropy {
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// stop silently
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return
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}
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envelope = nip77.ParseNegMessage(message)
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if envelope == nil {
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return
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}
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}
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switch env := envelope.(type) {
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case *nostr.EventEnvelope:
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// check id
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if !env.Event.CheckID() {
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ws.WriteJSON(nostr.OKEnvelope{EventID: env.Event.ID, OK: false, Reason: "invalid: id is computed incorrectly"})
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return
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}
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// check signature
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if ok, err := env.Event.CheckSignature(); err != nil {
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ws.WriteJSON(nostr.OKEnvelope{EventID: env.Event.ID, OK: false, Reason: "error: failed to verify signature"})
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return
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} else if !ok {
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ws.WriteJSON(nostr.OKEnvelope{EventID: env.Event.ID, OK: false, Reason: "invalid: signature is invalid"})
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return
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}
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// check NIP-70 protected
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for _, v := range env.Event.Tags {
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if len(v) == 1 && v[0] == "-" {
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msg := "must be published by event author"
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authed := GetAuthed(ctx)
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if authed == "" {
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RequestAuth(ctx)
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ws.WriteJSON(nostr.OKEnvelope{
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EventID: env.Event.ID,
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OK: false,
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Reason: "auth-required: " + msg,
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})
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return
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}
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if authed != env.Event.PubKey {
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ws.WriteJSON(nostr.OKEnvelope{
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EventID: env.Event.ID,
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OK: false,
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Reason: "blocked: " + msg,
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})
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return
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}
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}
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}
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srl := rl
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if rl.getSubRelayFromEvent != nil {
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srl = rl.getSubRelayFromEvent(&env.Event)
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}
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var ok bool
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var writeErr error
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var skipBroadcast bool
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if env.Event.Kind == 5 {
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// this always returns "blocked: " whenever it returns an error
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writeErr = srl.handleDeleteRequest(ctx, &env.Event)
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} else {
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// this will also always return a prefixed reason
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skipBroadcast, writeErr = srl.AddEvent(ctx, &env.Event)
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}
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var reason string
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if writeErr == nil {
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ok = true
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for _, ovw := range srl.OverwriteResponseEvent {
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ovw(ctx, &env.Event)
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}
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if !skipBroadcast {
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srl.notifyListeners(&env.Event)
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}
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} else {
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reason = writeErr.Error()
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if strings.HasPrefix(reason, "auth-required:") {
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RequestAuth(ctx)
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}
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}
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ws.WriteJSON(nostr.OKEnvelope{EventID: env.Event.ID, OK: ok, Reason: reason})
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case *nostr.CountEnvelope:
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if rl.CountEvents == nil {
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ws.WriteJSON(nostr.ClosedEnvelope{SubscriptionID: env.SubscriptionID, Reason: "unsupported: this relay does not support NIP-45"})
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return
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}
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var total int64
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for _, filter := range env.Filters {
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srl := rl
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if rl.getSubRelayFromFilter != nil {
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srl = rl.getSubRelayFromFilter(filter)
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}
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total += srl.handleCountRequest(ctx, ws, filter)
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}
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ws.WriteJSON(nostr.CountEnvelope{SubscriptionID: env.SubscriptionID, Count: &total})
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case *nostr.ReqEnvelope:
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eose := sync.WaitGroup{}
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eose.Add(len(env.Filters))
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// a context just for the "stored events" request handler
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reqCtx, cancelReqCtx := context.WithCancelCause(ctx)
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// expose subscription id in the context
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reqCtx = context.WithValue(reqCtx, subscriptionIdKey, env.SubscriptionID)
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// handle each filter separately -- dispatching events as they're loaded from databases
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for _, filter := range env.Filters {
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srl := rl
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if rl.getSubRelayFromFilter != nil {
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srl = rl.getSubRelayFromFilter(filter)
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}
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err := srl.handleRequest(reqCtx, env.SubscriptionID, &eose, ws, filter)
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if err != nil {
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// fail everything if any filter is rejected
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reason := err.Error()
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if strings.HasPrefix(reason, "auth-required:") {
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RequestAuth(ctx)
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}
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ws.WriteJSON(nostr.ClosedEnvelope{SubscriptionID: env.SubscriptionID, Reason: reason})
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cancelReqCtx(errors.New("filter rejected"))
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return
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} else {
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rl.addListener(ws, env.SubscriptionID, srl, filter, cancelReqCtx)
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}
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}
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go func() {
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// when all events have been loaded from databases and dispatched
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// we can cancel the context and fire the EOSE message
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eose.Wait()
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cancelReqCtx(nil)
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ws.WriteJSON(nostr.EOSEEnvelope(env.SubscriptionID))
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}()
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case *nostr.CloseEnvelope:
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id := string(*env)
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rl.removeListenerId(ws, id)
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case *nostr.AuthEnvelope:
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wsBaseUrl := strings.Replace(rl.ServiceURL, "http", "ws", 1)
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if pubkey, ok := nip42.ValidateAuthEvent(&env.Event, ws.Challenge, wsBaseUrl); ok {
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ws.AuthedPublicKey = pubkey
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ws.authLock.Lock()
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if ws.Authed != nil {
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close(ws.Authed)
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ws.Authed = nil
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}
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ws.authLock.Unlock()
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ws.WriteJSON(nostr.OKEnvelope{EventID: env.Event.ID, OK: true})
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} else {
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ws.WriteJSON(nostr.OKEnvelope{EventID: env.Event.ID, OK: false, Reason: "error: failed to authenticate"})
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}
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case *nip77.OpenEnvelope:
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srl := rl
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if rl.getSubRelayFromFilter != nil {
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srl = rl.getSubRelayFromFilter(env.Filter)
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if !srl.Negentropy {
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// ignore
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return
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}
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}
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vec, err := srl.startNegentropySession(ctx, env.Filter)
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if err != nil {
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// fail everything if any filter is rejected
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reason := err.Error()
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if strings.HasPrefix(reason, "auth-required:") {
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RequestAuth(ctx)
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}
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ws.WriteJSON(nip77.ErrorEnvelope{SubscriptionID: env.SubscriptionID, Reason: reason})
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return
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}
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// reconcile to get the next message and return it
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neg := negentropy.New(vec, 1024*1024)
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out, err := neg.Reconcile(env.Message)
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if err != nil {
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ws.WriteJSON(nip77.ErrorEnvelope{SubscriptionID: env.SubscriptionID, Reason: err.Error()})
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return
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}
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ws.WriteJSON(nip77.MessageEnvelope{SubscriptionID: env.SubscriptionID, Message: out})
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// if the message is not empty that means we'll probably have more reconciliation sessions, so store this
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if out != "" {
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deb := debounce.New(time.Second * 7)
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negSession := &NegentropySession{
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neg: neg,
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postponeClose: func() {
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deb(func() {
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ws.negentropySessions.Delete(env.SubscriptionID)
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})
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},
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}
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negSession.postponeClose()
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ws.negentropySessions.Store(env.SubscriptionID, negSession)
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}
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case *nip77.MessageEnvelope:
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negSession, ok := ws.negentropySessions.Load(env.SubscriptionID)
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if !ok {
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// bad luck, your request was destroyed
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ws.WriteJSON(nip77.ErrorEnvelope{SubscriptionID: env.SubscriptionID, Reason: "CLOSED"})
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return
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}
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// reconcile to get the next message and return it
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out, err := negSession.neg.Reconcile(env.Message)
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if err != nil {
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ws.WriteJSON(nip77.ErrorEnvelope{SubscriptionID: env.SubscriptionID, Reason: err.Error()})
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ws.negentropySessions.Delete(env.SubscriptionID)
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return
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}
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ws.WriteJSON(nip77.MessageEnvelope{SubscriptionID: env.SubscriptionID, Message: out})
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// if there is more reconciliation to do, postpone this
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if out != "" {
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negSession.postponeClose()
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} else {
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// otherwise we can just close it
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ws.negentropySessions.Delete(env.SubscriptionID)
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}
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case *nip77.CloseEnvelope:
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ws.negentropySessions.Delete(env.SubscriptionID)
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}
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}(message)
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}
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}()
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go func() {
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defer kill()
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for {
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select {
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case <-ctx.Done():
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return
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case <-ticker.C:
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err := ws.WriteMessage(websocket.PingMessage, nil)
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if err != nil {
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if !strings.HasSuffix(err.Error(), "use of closed network connection") {
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rl.Log.Printf("error writing ping: %v; closing websocket\n", err)
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}
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return
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}
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}
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}
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}()
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}
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