reject events based on timestamp

app/static/examples/config.example.yml

@@ -14,6 +14,11 @@ server:
   max_connections: 100
   max_subscriptions_per_client: 10
 
+event_time_constraints:
+  min_created_at: 1577836800 # January 1, 2020, as Unix timestamp
+  # max_created_at: 0 # Set to 0 to use the default behavior of 'now'
+  max_created_at_string: now+5m # Use a string to set a date for max created at in the future or past from current time
+
 resource_limits:
   cpu_cores: 2 # Limit the number of CPU cores the application can use
   memory_mb: 1024 # Cap the maximum amount of RAM in MB the application can use

config/loadConfig.go

@@ -6,6 +6,8 @@ import (
 
 	configTypes "grain/config/types"
 
+	"grain/server/utils"
+
 	"gopkg.in/yaml.v2"
 )
 
@@ -31,6 +33,9 @@ func LoadConfig(filename string) (*configTypes.ServerConfig, error) {
         return nil, err
     }
 
+    // Adjust event time constraints after loading
+	utils.AdjustEventTimeConstraints(&config)
+
     once.Do(func() {
         cfg = &config
     })

config/types/serverConfig.go

@@ -1,5 +1,11 @@
 package config
 
+type EventTimeConstraints struct {
+	MinCreatedAt       int64  `yaml:"min_created_at"`        // Minimum allowed timestamp
+	MaxCreatedAt       int64  `yaml:"max_created_at"`        // Maximum allowed timestamp
+	MaxCreatedAtString string `yaml:"max_created_at_string"` // Original string value for parsing (e.g., "now+5m")
+}
+
 type ServerConfig struct {
 	MongoDB struct {
 		URI      string `yaml:"uri"`
@@ -7,15 +13,16 @@ type ServerConfig struct {
 	} `yaml:"mongodb"`
 	Server struct {
 		Port                      string `yaml:"port"`
-		ReadTimeout               int    `yaml:"read_timeout"`                 // Timeout in seconds
+		ReadTimeout               int    `yaml:"read_timeout"`
-		WriteTimeout              int    `yaml:"write_timeout"`                // Timeout in seconds
+		WriteTimeout              int    `yaml:"write_timeout"`
-		IdleTimeout               int    `yaml:"idle_timeout"`                 // Timeout in seconds
+		IdleTimeout               int    `yaml:"idle_timeout"`
-		MaxConnections            int    `yaml:"max_connections"`              // Maximum number of concurrent connections
+		MaxConnections            int    `yaml:"max_connections"`
-		MaxSubscriptionsPerClient int    `yaml:"max_subscriptions_per_client"` // Maximum number of subscriptions per client
+		MaxSubscriptionsPerClient int    `yaml:"max_subscriptions_per_client"`
 	} `yaml:"server"`
 	RateLimit            RateLimitConfig      `yaml:"rate_limit"`
 	Blacklist            BlacklistConfig      `yaml:"blacklist"`
 	ResourceLimits       ResourceLimits       `yaml:"resource_limits"`
 	Auth                 AuthConfig           `yaml:"auth"`
 	EventPurge           EventPurgeConfig     `yaml:"event_purge"`
+	EventTimeConstraints EventTimeConstraints `yaml:"event_time_constraints"` // Added this field
 }

main.go

@@ -28,6 +28,9 @@ func main() {
 
     restartChan := make(chan struct{})
     go config.WatchConfigFile("config.yml", restartChan)
+    go config.WatchConfigFile("whitelist.yml", restartChan)
+    go config.WatchConfigFile("blacklist.yml", restartChan)
+    go config.WatchConfigFile("relay_metadata.json", restartChan)
 
     signalChan := make(chan os.Signal, 1)
     signal.Notify(signalChan, syscall.SIGINT, syscall.SIGTERM)

server/handlers/event.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"grain/config"
 	"grain/server/db/mongo"
+	"time"
 
 	"grain/server/handlers/response"
 	"grain/server/utils"
@@ -16,7 +17,6 @@ import (
 )
 
 func HandleEvent(ws *websocket.Conn, message []interface{}) {
-
 	if len(message) != 2 {
 		fmt.Println("Invalid EVENT message format")
 		response.SendNotice(ws, "", "Invalid EVENT message format")
@@ -44,13 +44,19 @@ func HandleEvent(ws *websocket.Conn, message []interface{}) {
 		return
 	}
 
+	// Validate event timestamps
+	if !validateEventTimestamp(evt) {
+		response.SendOK(ws, evt.ID, false, "invalid: event created_at timestamp is out of allowed range")
+		return
+	}
+
 	// Signature check moved here
 	if !utils.CheckSignature(evt) {
 		response.SendOK(ws, evt.ID, false, "invalid: signature verification failed")
 		return
 	}
 
-	eventSize := len(eventBytes) // Calculate event size
+	eventSize := len(eventBytes)
 
 	if !handleBlacklistAndWhitelist(ws, evt) {
 		return
@@ -60,11 +66,40 @@ func HandleEvent(ws *websocket.Conn, message []interface{}) {
 		return
 	}
 
-	// This is where I'll handle storage for multiple database types in the future
+	// Store the event in MongoDB or other storage
 	mongo.StoreMongoEvent(context.TODO(), evt, ws)
-
 	fmt.Println("Event processed:", evt.ID)
+}
 
+// Validate event timestamps against the configured min and max values
+func validateEventTimestamp(evt nostr.Event) bool {
+	cfg := config.GetConfig()
+	if cfg == nil {
+		fmt.Println("Server configuration is not loaded")
+		return false
+	}
+
+	// Use current time for max and a fixed date for min if not specified
+	now := time.Now().Unix()
+	minCreatedAt := cfg.EventTimeConstraints.MinCreatedAt
+	if minCreatedAt == 0 {
+		// Use January 1, 2020, as the default minimum timestamp
+		minCreatedAt = time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
+	}
+
+	maxCreatedAt := cfg.EventTimeConstraints.MaxCreatedAt
+	if maxCreatedAt == 0 {
+		// Default to the current time if not set
+		maxCreatedAt = now
+	}
+
+	// Check if the event's created_at timestamp falls within the allowed range
+	if evt.CreatedAt < minCreatedAt || evt.CreatedAt > maxCreatedAt {
+		fmt.Printf("Event %s created_at timestamp %d is out of range [%d, %d]\n", evt.ID, evt.CreatedAt, minCreatedAt, maxCreatedAt)
+		return false
+	}
+
+	return true
 }
 
 func handleBlacklistAndWhitelist(ws *websocket.Conn, evt nostr.Event) bool {

server/utils/adjustTimeContraints.go

@@ -0,0 +1,34 @@
+package utils
+
+import (
+	"fmt"
+	config "grain/config/types"
+	"strings"
+	"time"
+)
+
+// Adjusts the event time constraints based on the configuration
+func AdjustEventTimeConstraints(cfg *config.ServerConfig) {
+	now := time.Now()
+
+	// Adjust min_created_at (no changes needed if it's already set in the config)
+	if cfg.EventTimeConstraints.MinCreatedAt == 0 {
+		cfg.EventTimeConstraints.MinCreatedAt = time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
+	}
+
+	// Adjust max_created_at
+	if strings.HasPrefix(cfg.EventTimeConstraints.MaxCreatedAtString, "now") {
+		// Extract the offset (e.g., "+5m")
+		offset := strings.TrimPrefix(cfg.EventTimeConstraints.MaxCreatedAtString, "now")
+		duration, err := time.ParseDuration(offset)
+		if err != nil {
+			fmt.Printf("Invalid time offset for max_created_at: %s\n", offset)
+			cfg.EventTimeConstraints.MaxCreatedAt = now.Unix() // Default to now if parsing fails
+		} else {
+			cfg.EventTimeConstraints.MaxCreatedAt = now.Add(duration).Unix()
+		}
+	} else if cfg.EventTimeConstraints.MaxCreatedAt == 0 {
+		// Default to the current time if it's set to zero and no "now" keyword is used
+		cfg.EventTimeConstraints.MaxCreatedAt = now.Unix()
+	}
+}