pubkey whitelist!

app/static/examples/config.example.yml

@@ -4,7 +4,10 @@ mongodb:
 
 server:
   port: ":8080" # Port for the server to listen on
-
+whitelist:
+  enabled: false
+  pubkeys: #["3fe0ab6cbdb7ee27148202249e3fb3b89423c6f6cda6ef43ea5057c3d93088e4",
+  #"cac0e43235806da094f0787a5b04e29ad04cb1a3c7ea5cf61edc1c338734082b"]
 rate_limit:
   ws_limit: 100 # Global rate limit for WebSocket messages (50 messages per second)
   ws_burst: 200 # Global burst limit for WebSocket messages (allows a burst of 100 messages)

config/loadConfig.go

@@ -2,24 +2,37 @@ package config
 
 import (
 	"os"
+	"sync"
 
-	config "grain/config/types"
+	configTypes "grain/config/types"
 
 	"gopkg.in/yaml.v2"
 )
 
-func LoadConfig(filename string) (*config.ServerConfig, error) {
+var (
+	cfg  *configTypes.ServerConfig
+	once sync.Once
+)
+
+func LoadConfig(filename string) (*configTypes.ServerConfig, error) {
 	data, err := os.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
 
-	var config config.ServerConfig
-
+	var config configTypes.ServerConfig
 	err = yaml.Unmarshal(data, &config)
 	if err != nil {
 		return nil, err
 	}
 
-	return &config, nil
+	once.Do(func() {
+		cfg = &config
+	})
+
+	return cfg, nil
+}
+
+func GetConfig() *configTypes.ServerConfig {
+	return cfg
 }

config/rateLimiter.go

@@ -30,7 +30,7 @@ type RateLimiter struct {
 }
 
 var rateLimiterInstance *RateLimiter
-var once sync.Once
+var rateOnce sync.Once
 
 func SetupRateLimiter(cfg *config.ServerConfig) {
 	rateLimiter := NewRateLimiter(
@@ -54,7 +54,7 @@ func SetupRateLimiter(cfg *config.ServerConfig) {
 }
 
 func SetRateLimiter(rl *RateLimiter) {
-	once.Do(func() {
+	rateOnce.Do(func() {
 		rateLimiterInstance = rl
 	})
 }

config/types/serverConfig.go

@@ -9,4 +9,5 @@ type ServerConfig struct {
 		Port string `yaml:"port"`
 	} `yaml:"server"`
 	RateLimit RateLimitConfig `yaml:"rate_limit"`
+	Whitelist WhitelistConfig `yaml:"whitelist"`
 }

config/types/whitelistConfig.go

@@ -0,0 +1,6 @@
+package config
+
+type WhitelistConfig struct {
+	Enabled bool     `yaml:"enabled"`
+	Pubkeys []string `yaml:"pubkeys"`
+}

server/handlers/event.go

@@ -59,6 +59,12 @@ func HandleKind(ctx context.Context, evt relay.Event, ws *websocket.Conn, eventS
 	rateLimiter := config.GetRateLimiter()
 	sizeLimiter := config.GetSizeLimiter()
 
+	// Check whitelist
+	if !isWhitelisted(evt.PubKey) {
+		response.SendOK(ws, evt.ID, false, "not allowed: pubkey is not whitelisted")
+		return
+	}
+
 	category := determineCategory(evt.Kind)
 
 	if allowed, msg := rateLimiter.AllowEvent(evt.Kind, category); !allowed {
@@ -121,3 +127,17 @@ func determineCategory(kind int) string {
 		return "unknown"
 	}
 }
+
+// Helper function to check if a pubkey is whitelisted
+func isWhitelisted(pubKey string) bool {
+	cfg := config.GetConfig()
+	if !cfg.Whitelist.Enabled {
+		return true
+	}
+	for _, whitelistedKey := range cfg.Whitelist.Pubkeys {
+		if pubKey == whitelistedKey {
+			return true
+		}
+	}
+	return false
+}