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feat: accept DNS resolver when resolving DNSADDR addresses
Accept a `DNS` instance from `@multiformats/dns` when resolving DNSADDR addresses. Gives the user flexibility to control which DNS servers are used to resolve TXT records.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| import { CodeError } from '@libp2p/interface' | ||
| import { dns, RecordType } from '@multiformats/dns' | ||
| import { raceSignal } from 'race-signal' | ||
| import { multiaddr } from '../index.js' | ||
| import { getProtocol } from '../protocols-table.js' | ||
| import type { Resolver } from './index.js' | ||
| import type { AbortOptions, Multiaddr } from '../index.js' | ||
| import type { DNS } from '@multiformats/dns' | ||
|
|
||
| const MAX_RECURSIVE_DEPTH = 32 | ||
| const { code: dnsaddrCode } = getProtocol('dnsaddr') | ||
|
|
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| export interface DNSADDROptions extends AbortOptions { | ||
| /** | ||
| * An optional DNS resolver | ||
| */ | ||
| dns?: DNS | ||
|
|
||
| /** | ||
| * When resolving DNSADDR Multiaddrs that resolve to other DNSADDR Multiaddrs, | ||
| * limit how many times we will recursively resolve them. | ||
| * | ||
| * @default 32 | ||
| */ | ||
| maxRecursiveDepth?: number | ||
| } | ||
|
|
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| export const dnsaddr: Resolver<DNSADDROptions> = async function dnsaddr (ma: Multiaddr, options: DNSADDROptions = {}): Promise<Multiaddr[]> { | ||
| const recursionLimit = options.maxRecursiveDepth ?? MAX_RECURSIVE_DEPTH | ||
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|
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| if (recursionLimit === 0) { | ||
| throw new CodeError('Max recursive depth reached', 'ERR_MAX_RECURSIVE_DEPTH_REACHED') | ||
| } | ||
|
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| const [, hostname] = ma.stringTuples().find(([proto]) => proto === dnsaddrCode) ?? [] | ||
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| const resolver = options?.dns ?? dns() | ||
| const result = await raceSignal(resolver.query(`_dnsaddr.${hostname}`, { | ||
| signal: options?.signal, | ||
| types: [ | ||
| RecordType.TXT | ||
| ] | ||
| }), options.signal) | ||
|
|
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| const peerId = ma.getPeerId() | ||
| const output: Multiaddr[] = [] | ||
|
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| for (const answer of result.Answer) { | ||
| const addr = answer.data.split('=')[1] | ||
|
|
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| if (addr == null) { | ||
| continue | ||
| } | ||
|
|
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| if (peerId != null && !addr.includes(peerId)) { | ||
| continue | ||
| } | ||
|
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| const ma = multiaddr(addr) | ||
|
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| if (addr.startsWith('/dnsaddr')) { | ||
| const resolved = await ma.resolve({ | ||
| ...options, | ||
| maxRecursiveDepth: recursionLimit - 1 | ||
| }) | ||
|
|
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| output.push(...resolved) | ||
| } else { | ||
| output.push(ma) | ||
| } | ||
| } | ||
|
|
||
| return output | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,59 +1,7 @@ | ||
| /** | ||
| * @packageDocumentation | ||
| * | ||
| * Provides strategies for resolving multiaddrs. | ||
| */ | ||
|
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| import { getProtocol } from '../protocols-table.js' | ||
| import Resolver from './dns.js' | ||
| import type { AbortOptions, Multiaddr } from '../index.js' | ||
|
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| const { code: dnsaddrCode } = getProtocol('dnsaddr') | ||
|
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| /** | ||
| * Resolver for dnsaddr addresses. | ||
| * | ||
| * @example | ||
| * | ||
| * ```typescript | ||
| * import { dnsaddrResolver } from '@multiformats/multiaddr/resolvers' | ||
| * import { multiaddr } from '@multiformats/multiaddr' | ||
| * | ||
| * const ma = multiaddr('/dnsaddr/bootstrap.libp2p.io') | ||
| * const addresses = await dnsaddrResolver(ma) | ||
| * | ||
| * console.info(addresses) | ||
| * //[ | ||
| * // '/dnsaddr/am6.bootstrap.libp2p.io/p2p/QmbLHAnMoJPWSCR5Zhtx6BHJX9KiKNN6tpvbUcqanj75Nb', | ||
| * // '/dnsaddr/ny5.bootstrap.libp2p.io/p2p/QmQCU2EcMqAqQPR2i9bChDtGNJchTbq5TbXJJ16u19uLTa', | ||
| * // '/dnsaddr/sg1.bootstrap.libp2p.io/p2p/QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt', | ||
| * // '/dnsaddr/sv15.bootstrap.libp2p.io/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN' | ||
| * //] | ||
| * ``` | ||
| */ | ||
| export async function dnsaddrResolver (addr: Multiaddr, options: AbortOptions = {}): Promise<string[]> { | ||
| const resolver = new Resolver() | ||
|
|
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| if (options.signal != null) { | ||
| options.signal.addEventListener('abort', () => { | ||
| resolver.cancel() | ||
| }) | ||
| } | ||
|
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| const peerId = addr.getPeerId() | ||
| const [, hostname] = addr.stringTuples().find(([proto]) => proto === dnsaddrCode) ?? [] | ||
|
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| if (hostname == null) { | ||
| throw new Error('No hostname found in multiaddr') | ||
| } | ||
|
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| const records = await resolver.resolveTxt(`_dnsaddr.${hostname}`) | ||
|
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| let addresses = records.flat().map((a) => a.split('=')[1]).filter(Boolean) | ||
|
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| if (peerId != null) { | ||
| addresses = addresses.filter((entry) => entry.includes(peerId)) | ||
| } | ||
|
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| return addresses | ||
| export interface Resolver<ResolveOptions extends AbortOptions = AbortOptions> { | ||
| (ma: Multiaddr, options?: ResolveOptions): Promise<Multiaddr[]> | ||
| } | ||
|
|
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| export { dnsaddr } from './dnsaddr.js' |
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