@kehto/runtime

Browser-agnostic protocol engine for the napplet protocol.

Alpha status: Kehto is an early runtime implementation for a draft NIP-5D protocol. NAP contracts and runtime APIs are not final; treat this package as current implementation guidance, not as a stable protocol guarantee.

Install

pnpm add @kehto/runtime
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Overview

@kehto/runtime is Kehto's NIP-5D protocol engine. It owns every incoming napplet message, gates it through the ACL enforcement layer, routes it to the correct NAP handler, and emits the corresponding reply envelope.

The runtime is built around the current draft dispatch contract from @napplet/core — createDispatch() + registerNap() — so routing is declarative, not a hand-rolled switch. It covers the NIP-5D domains currently supported by Kehto:

• identity — identity.getProfile, identity.getFollows, identity.getPublicKey, …
• inc — inc.channel.*, inc.emit, cross-napplet pub/sub
• keys — keys.forward, keys.action, keys.bind
• media — media.* playback & transport control
• notify — notify.send, notify.channel.register, badge/permission flows
• relay — relay.publish, relay.publishEncrypted, relay.subscribe
• storage — storage.get/set/remove/keys with quota enforcement
• theme — theme.get, theme.changed fan-out

Signing is shell-mediated inside relay.publish / relay.publishEncrypted (NIP-44 default, NIP-04 opt-in). The legacy signer domain is dissolved — napplets never see a host-injected nostr object and cannot call signer-sign RPCs directly.

Everything plugs into a single factory, createRuntime(), via a RuntimeAdapter hook bag — persistence, relay pool, auth, services, and so on. No DOM, no postMessage, no localStorage: those live in @kehto/shell.

Quick Start

import { createRuntime } from '@kehto/runtime';

const runtime = createRuntime({
  aclPersistence: aclStore,
  manifestPersistence: manifestStore,
  relayPool: myRelayPoolAdapter,
  auth: myAuthAdapter,
  // ... further adapter hooks
});

// Incoming NIP-5D draft envelope from a napplet:
runtime.handleMessage('window-1', {
  type: 'relay.publish',
  id: 'evt-42',
  event: { kind: 1, content: 'hello', /* ... */ },
});
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Public API

Runtime factory

• createRuntime — primary entry point; Runtime interface type

Enforcement gate

• createEnforceGate — legacy pubkey-keyed ACL gate
• createNapEnforceGate — NIP-5D windowId-keyed ACL gate
• resolveCapabilitiesNap — map a NIP-5D envelope to required capabilities (re-exported from @kehto/acl)
• formatDenialReason — denied: <capability> canonical string

Session registry

• createSessionRegistry — bidirectional windowId ↔ SessionEntry store
• createNappKeyRegistry — deprecated alias retained for v1.1 migration consumers

ACL state container

• createAclState — persistence-backed wrapper around @kehto/acl state

Manifest cache

• createManifestCache — NIP-5A aggregate-hash cache with persistence hooks

Replay detection

• createReplayDetector — duplicate-event + timestamp-window guard

Event buffer

• createEventBuffer — ring buffer with subscription delivery
• matchesFilter, matchesAnyFilter — pure NIP-01 filter helpers
• RING_BUFFER_SIZE — default ring buffer capacity constant

State handler

• handleStorageNap — canonical storage.* NIP-5D handler
• cleanupNappState — remove persisted state when a napplet window closes

Service dispatch

• routeServiceMessage — domain-prefix router into the service registry
• notifyServiceWindowDestroyed — lifecycle fan-out to every service handler

Types

40+ interfaces — including Runtime, RuntimeAdapter, SendToNapplet, RelayPoolAdapter, ServiceHandler, ServiceRegistry, NappletMessage, SessionEntry, AclEntryExternal, AclCheckEvent, and the per-adapter hook types — are exported from ./types.js for host-app integration.

Compat re-exports (DRIFT-CORE-06)

Retained for migration consumers; new integrations should use current NIP-5D envelope types from @napplet/core. Slated for removal once upstream restores those exports.

Re-exported constants cover the v1.1 bus-kind enum, auth event kind, shell bridge URI, protocol version string, the full capability list, destructive-kind set, and the replay window seconds. Re-exported types cover the v1.1 capability union, bus-kind numeric union, and service descriptor shape. See the typedoc API reference below for the exact identifier list and current numeric values.

API Reference

Full package docs: docs/packages/runtime.md. Generated API module: docs/api/modules/_kehto_runtime.html (run pnpm docs:api).

License

MIT