Add Blossom bandwidth limiting and tune rate limiters (v0.49.0)

- Add token-bucket bandwidth rate limiting for Blossom uploads
  - ORLY_BLOSSOM_RATE_LIMIT enables limiting (default: false)
  - ORLY_BLOSSOM_DAILY_LIMIT_MB sets daily limit (default: 10MB)
  - ORLY_BLOSSOM_BURST_LIMIT_MB sets burst cap (default: 50MB)
  - Followed users, admins, owners are exempt (unlimited)
- Change emergency mode throttling from exponential to linear scaling
  - Old: 16x multiplier at emergency threshold entry
  - New: 1x at threshold, +1x per 20% excess pressure
- Reduce follows ACL throttle increment from 200ms to 25ms per event
- Update dependencies

Files modified:
- app/blossom.go: Pass rate limit config to blossom server
- app/config/config.go: Add Blossom rate limit config options
- pkg/blossom/ratelimit.go: New bandwidth limiter implementation
- pkg/blossom/server.go: Add rate limiter integration
- pkg/blossom/handlers.go: Check rate limits on upload/mirror/media
- pkg/ratelimit/limiter.go: Linear emergency throttling
- pkg/acl/follows.go: Reduce default throttle increment

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/blossom.go

@@ -20,8 +20,12 @@ func initializeBlossomServer(
 	blossomCfg := &blossom.Config{
 		BaseURL:          "", // Will be set dynamically per request
 		MaxBlobSize:      100 * 1024 * 1024, // 100MB default
-		AllowedMimeTypes: nil,                // Allow all MIME types by default
+		AllowedMimeTypes: nil,               // Allow all MIME types by default
 		RequireAuth:      cfg.AuthRequired || cfg.AuthToWrite,
+		// Rate limiting for non-followed users
+		RateLimitEnabled: cfg.BlossomRateLimitEnabled,
+		DailyLimitMB:     cfg.BlossomDailyLimitMB,
+		BurstLimitMB:     cfg.BlossomBurstLimitMB,
 	}
 
 	// Create blossom server with relay's ACL registry
@@ -31,7 +35,12 @@ func initializeBlossomServer(
 	// We'll need to modify the handler to inject the baseURL per request
 	// For now, we'll use a middleware approach
 
-	log.I.F("blossom server initialized with ACL mode: %s", cfg.ACLMode)
+	if cfg.BlossomRateLimitEnabled {
+		log.I.F("blossom server initialized with ACL mode: %s, rate limit: %dMB/day (burst: %dMB)",
+			cfg.ACLMode, cfg.BlossomDailyLimitMB, cfg.BlossomBurstLimitMB)
+	} else {
+		log.I.F("blossom server initialized with ACL mode: %s", cfg.ACLMode)
+	}
 	return bs, nil
 }
 

app/config/config.go

@@ -69,13 +69,18 @@ type C struct {
 
 	// Progressive throttle for follows ACL mode - allows non-followed users to write with increasing delay
 	FollowsThrottleEnabled  bool          `env:"ORLY_FOLLOWS_THROTTLE" default:"false" usage:"enable progressive delay for non-followed users in follows ACL mode"`
-	FollowsThrottlePerEvent time.Duration `env:"ORLY_FOLLOWS_THROTTLE_INCREMENT" default:"200ms" usage:"delay added per event for non-followed users"`
+	FollowsThrottlePerEvent time.Duration `env:"ORLY_FOLLOWS_THROTTLE_INCREMENT" default:"25ms" usage:"delay added per event for non-followed users"`
 	FollowsThrottleMaxDelay time.Duration `env:"ORLY_FOLLOWS_THROTTLE_MAX" default:"60s" usage:"maximum throttle delay cap"`
 
 	// Blossom blob storage service settings
 	BlossomEnabled       bool   `env:"ORLY_BLOSSOM_ENABLED" default:"true" usage:"enable Blossom blob storage server (only works with Badger backend)"`
 	BlossomServiceLevels string `env:"ORLY_BLOSSOM_SERVICE_LEVELS" usage:"comma-separated list of service levels in format: name:storage_mb_per_sat_per_month (e.g., basic:1,premium:10)"`
 
+	// Blossom upload rate limiting (for non-followed users)
+	BlossomRateLimitEnabled bool  `env:"ORLY_BLOSSOM_RATE_LIMIT" default:"false" usage:"enable upload rate limiting for non-followed users"`
+	BlossomDailyLimitMB     int64 `env:"ORLY_BLOSSOM_DAILY_LIMIT_MB" default:"10" usage:"daily upload limit in MB for non-followed users (EMA averaged)"`
+	BlossomBurstLimitMB     int64 `env:"ORLY_BLOSSOM_BURST_LIMIT_MB" default:"50" usage:"max burst upload in MB (bucket cap)"`
+
 	// Web UI and dev mode settings
 	WebDisableEmbedded bool   `env:"ORLY_WEB_DISABLE" default:"false" usage:"disable serving the embedded web UI; useful for hot-reload during development"`
 	WebDevProxyURL     string `env:"ORLY_WEB_DEV_PROXY_URL" usage:"when ORLY_WEB_DISABLE is true, reverse-proxy non-API paths to this dev server URL (e.g. http://localhost:5173)"`

app/handle-cashu.go

@@ -124,6 +124,17 @@ func (s *Server) handleCashuKeysets(w http.ResponseWriter, r *http.Request) {
 
 // handleCashuInfo handles GET /cashu/info - returns mint information.
 func (s *Server) handleCashuInfo(w http.ResponseWriter, r *http.Request) {
+	// CORS headers for browser-based CAT support detection
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	w.Header().Set("Access-Control-Allow-Methods", "GET, OPTIONS")
+	w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Accept")
+
+	// Handle preflight
+	if r.Method == http.MethodOptions {
+		w.WriteHeader(http.StatusNoContent)
+		return
+	}
+
 	if s.CashuIssuer == nil {
 		http.Error(w, "Cashu tokens not enabled", http.StatusNotImplemented)
 		return

app/handle-event.go

@@ -21,7 +21,7 @@ import (
 )
 
 func (l *Listener) HandleEvent(msg []byte) (err error) {
-	log.D.F("HandleEvent: START handling event: %s", msg)
+	log.I.F("HandleEvent: START handling event: %s", string(msg[:min(200, len(msg))]))
 
 	// 1. Raw JSON validation (before unmarshal) - use validation service
 	if result := l.eventValidator.ValidateRawJSON(msg); !result.Valid {
@@ -231,6 +231,11 @@ func (l *Listener) HandleEvent(msg []byte) (err error) {
 
 	// Authorization check (policy + ACL) - use authorization service
 	decision := l.eventAuthorizer.Authorize(env.E, l.authedPubkey.Load(), l.remote, env.E.Kind)
+	// Debug: log ephemeral event authorization
+	if env.E.Kind >= 20000 && env.E.Kind < 30000 {
+		log.I.F("ephemeral auth check: kind %d, allowed=%v, reason=%s",
+			env.E.Kind, decision.Allowed, decision.DenyReason)
+	}
 	if !decision.Allowed {
 		log.D.F("HandleEvent: authorization denied: %s (requireAuth=%v)", decision.DenyReason, decision.RequireAuth)
 		if decision.RequireAuth {
@@ -256,14 +261,17 @@ func (l *Listener) HandleEvent(msg []byte) (err error) {
 	log.I.F("HandleEvent: authorized with access level %s", decision.AccessLevel)
 
 	// Progressive throttle for follows ACL mode (delays non-followed users)
-	if delay := l.getFollowsThrottleDelay(env.E); delay > 0 {
-		log.D.F("HandleEvent: applying progressive throttle delay of %v for %0x from %s",
-			delay, env.E.Pubkey, l.remote)
-		select {
-		case <-l.ctx.Done():
-			return l.ctx.Err()
-		case <-time.After(delay):
-			// Delay completed, continue processing
+	// Skip throttle if a Cashu Access Token is present (authenticated via CAT)
+	if l.cashuToken == nil {
+		if delay := l.getFollowsThrottleDelay(env.E); delay > 0 {
+			log.D.F("HandleEvent: applying progressive throttle delay of %v for %0x from %s",
+				delay, env.E.Pubkey, l.remote)
+			select {
+			case <-l.ctx.Done():
+				return l.ctx.Err()
+			case <-time.After(delay):
+				// Delay completed, continue processing
+			}
 		}
 	}
 

app/publisher.go

@@ -159,12 +159,26 @@ func (p *P) Deliver(ev *event.E) {
 		sub Subscription
 	}
 	var deliveries []delivery
+	// Debug: log ephemeral event delivery attempts
+	isEphemeral := ev.Kind >= 20000 && ev.Kind < 30000
+	if isEphemeral {
+		var tagInfo string
+		if ev.Tags != nil {
+			tagInfo = string(ev.Tags.Marshal(nil))
+		}
+		log.I.F("ephemeral event kind %d, id %0x, checking %d connections for matches, tags: %s",
+			ev.Kind, ev.ID[:8], len(p.Map), tagInfo)
+	}
 	for w, subs := range p.Map {
 		for id, subscriber := range subs {
 			if subscriber.Match(ev) {
 				deliveries = append(
 					deliveries, delivery{w: w, id: id, sub: subscriber},
 				)
+			} else if isEphemeral {
+				// Debug: log why ephemeral events don't match
+				log.I.F("ephemeral event kind %d did NOT match subscription %s (filters: %s)",
+					ev.Kind, id, string(subscriber.S.Marshal(nil)))
 			}
 		}
 	}