@kehto/acl

Pure, WASM-ready ACL module for the napplet protocol — zero dependencies, zero side effects.

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

Install

pnpm add @kehto/acl
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Overview

@kehto/acl is Kehto's access-control core. It owns an immutable AclState keyed on the current NIP-5D 2-segment identity (dTag, hash) shape (the earlier (pubkey, dTag, hash) triple is dropped; migrateAclState ships for legacy persistence readers).

Every function is pure: state in, state out. No I/O, no timers, no globals — the module is trivially compilable to WASM and is the single source of truth for capability decisions.

The module exposes two parallel capability surfaces:

• Bitfield constants (CAP_RELAY_READ, CAP_RELAY_WRITE, CAP_STATE_READ, CAP_STATE_WRITE, …) — the compact per-entry representation used inside AclState.entries[*].caps.
• Current draft NIP-5D capability strings (CAP_IDENTITY_READ, CAP_KEYS_BIND, CAP_KEYS_FORWARD, CAP_MEDIA_CONTROL, CAP_NOTIFY_SEND, CAP_NOTIFY_CHANNEL, CAP_THEME_READ) — plus the retained relay:*, cache:*, hotkey:forward, and state:* literals. These strings are what resolveCapabilitiesNap() returns and what @kehto/runtime's enforce gate grants/revokes against. The earlier sign:event/sign:nip04/sign:nip44 entries were intentionally removed — the current NIP-5D draft does not expose napplet-visible signing.

Quick Start

import {
  createState,
  grant,
  check,
  block,
  unblock,
  CAP_RELAY_WRITE,
  CAP_NOTIFY_SEND,
} from '@kehto/acl';

// 1. Start with a restrictive state — unknown identities are denied everything.
let state = createState('restrictive');

const id = { dTag: 'chat', hash: 'ff00aa11' };

// 2. Grant the two current draft capabilities this napplet needs.
state = grant(state, id, CAP_RELAY_WRITE);
state = grant(state, id, CAP_NOTIFY_SEND);

check(state, id, CAP_RELAY_WRITE); // true
check(state, id, CAP_NOTIFY_SEND); // true

// 3. Block the identity — all checks fail until unblocked, caps are preserved.
state = block(state, id);
check(state, id, CAP_RELAY_WRITE); // false (blocked)

state = unblock(state, id);
check(state, id, CAP_RELAY_WRITE); // true (restored)
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Public API

Types

• AclState — immutable ACL state container
• AclEntry — per-identity entry (caps, blocked, quota)
• Identity — { dTag, hash } pair (NIP-5D 2-segment identity)
• Capability — union of every canonical capability string
• CapabilityResolution — { senderCap, recipientCap } returned by resolveCapabilitiesNap
• NapMessage — minimal shape consumed by resolveCapabilitiesNap ({ type: string })

Constants — bit flags

• CAP_RELAY_READ, CAP_RELAY_WRITE, CAP_CACHE_READ, CAP_CACHE_WRITE
• CAP_HOTKEY_FORWARD, CAP_SIGN_EVENT, CAP_SIGN_NIP04, CAP_SIGN_NIP44
• CAP_STATE_READ, CAP_STATE_WRITE, CAP_ALL, CAP_NONE
• DEFAULT_QUOTA

Constants — current draft NIP-5D capability strings

• ALL_CAPABILITIES — readonly tuple of every recognized capability string
• CAP_IDENTITY_READ, CAP_KEYS_BIND, CAP_KEYS_FORWARD
• CAP_MEDIA_CONTROL, CAP_NOTIFY_SEND, CAP_NOTIFY_CHANNEL, CAP_THEME_READ

State mutations

• createState — create an empty AclState
• grant, revoke — add/remove capability bits
• block, unblock — toggle the block flag
• setQuota, getQuota — per-identity state storage quota
• serialize, deserialize — JSON round-trip for persistence

Capability resolution

• check — evaluate identity + capability against state
• toKey — compute the dTag:hash composite key
• resolveCapabilitiesNap — map a NIP-5D NAP envelope type to the required sender/recipient capabilities across the current supported domains

Migration

• migrateAclState — one-shot migration from the legacy 3-segment pubkey:dTag:hash keys to the v1.2 2-segment dTag:hash keys; idempotent (returns the same reference when nothing to migrate)

API Reference

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

License

MIT