bring in khatru and eventstore.

khatru/policies/ratelimits.go

@@ -0,0 +1,46 @@
+package policies
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/fiatjaf/khatru"
+	"github.com/nbd-wtf/go-nostr"
+)
+
+func EventIPRateLimiter(tokensPerInterval int, interval time.Duration, maxTokens int) func(ctx context.Context, _ *nostr.Event) (reject bool, msg string) {
+	rl := startRateLimitSystem[string](tokensPerInterval, interval, maxTokens)
+
+	return func(ctx context.Context, _ *nostr.Event) (reject bool, msg string) {
+		ip := khatru.GetIP(ctx)
+		if ip == "" {
+			return false, ""
+		}
+		return rl(ip), "rate-limited: slow down, please"
+	}
+}
+
+func EventPubKeyRateLimiter(tokensPerInterval int, interval time.Duration, maxTokens int) func(ctx context.Context, _ *nostr.Event) (reject bool, msg string) {
+	rl := startRateLimitSystem[string](tokensPerInterval, interval, maxTokens)
+
+	return func(ctx context.Context, evt *nostr.Event) (reject bool, msg string) {
+		return rl(evt.PubKey), "rate-limited: slow down, please"
+	}
+}
+
+func ConnectionRateLimiter(tokensPerInterval int, interval time.Duration, maxTokens int) func(r *http.Request) bool {
+	rl := startRateLimitSystem[string](tokensPerInterval, interval, maxTokens)
+
+	return func(r *http.Request) bool {
+		return rl(khatru.GetIPFromRequest(r))
+	}
+}
+
+func FilterIPRateLimiter(tokensPerInterval int, interval time.Duration, maxTokens int) func(ctx context.Context, _ nostr.Filter) (reject bool, msg string) {
+	rl := startRateLimitSystem[string](tokensPerInterval, interval, maxTokens)
+
+	return func(ctx context.Context, _ nostr.Filter) (reject bool, msg string) {
+		return rl(khatru.GetIP(ctx)), "rate-limited: there is a bug in the client, no one should be making so many requests"
+	}
+}