well-goknown/nostr/policies.go

package nostr

import (
	"context"
	"fmt"

	"git.devvul.com/asara/gologger"
	"git.devvul.com/asara/well-goknown/config"
	"github.com/fiatjaf/khatru"
	"github.com/nbd-wtf/go-nostr"
)

func RejectUnregisteredNpubs(ctx context.Context, event *nostr.Event) (reject bool, msg string) {
	var err error
	l := gologger.Get(config.GetConfig().LogLevel).With().Str("context", "nostr-reject-unregistered").Logger()

	// always allow seals, lightning ephemeral messages, auth messages
	if event.Kind == 13 || event.Kind == 21000 || event.Kind == 22242 || event.Kind == 30078 {
		return false, ""
	}

	// ensure pubkey has authenticated
	authenticatedUser := khatru.GetAuthed(ctx)
	if authenticatedUser == "" {
		l.Debug().Msgf("kind: %v, pubkey not authed: %s", event.Kind, event.PubKey)
		return true, fmt.Sprintf("auth-required: interacting with this relay requires authentication")
	}

	npubs := []string{authenticatedUser}
	// add recipients of dms (nip04)/private dms (nip17)/gift wraps (nip59) to npubs list
	if event.Kind == 4 || event.Kind == 14 || event.Kind == 1059 {
		for _, npub := range event.Tags.GetAll([]string{"p"}) {
			npubs = append(npubs, npub.Value())
		}
	}

	// check if npubs are registered
	if authz := checknPubsInDb(npubs); authz == false {
		l.Debug().Msgf("kind: %v, pubkey: %s, error: %s", event.Kind, event.PubKey, err.Error())
		return true, fmt.Sprintf("restricted: pubkey %s is not registered to any users", authenticatedUser)
	}
	return false, ""
}