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whey.party
1import {type Did, isDid} from '@atproto/api'
2import {useQuery} from '@tanstack/react-query'
3
4import {STALE} from '.'
5import {LRU} from './direct-fetch-record'
6const RQKEY_ROOT = 'resolve-identity'
7export const RQKEY = (did: string) => [RQKEY_ROOT, did]
8
9// this isn't trusted...
10export type DidDocument = {
11 '@context'?: string[]
12 id?: string
13 alsoKnownAs?: string[]
14 verificationMethod?: VerificationMethod[]
15 service?: Service[]
16}
17
18export type VerificationMethod = {
19 id?: string
20 type?: string
21 controller?: string
22 publicKeyMultibase?: string
23}
24
25export type Service = {
26 id?: string
27 type?: string
28 serviceEndpoint?: string
29}
30
31const serviceCache = new LRU<Did, DidDocument>()
32
33export async function resolveDidDocument(did: Did) {
34 return await serviceCache.getOrTryInsertWith(did, async () => {
35 const docUrl = did.startsWith('did:plc:')
36 ? `https://plc.directory/${did}`
37 : `https://${did.substring(8)}/.well-known/did.json`
38
39 // TODO: we should probably validate this...
40 return await (await fetch(docUrl)).json()
41 })
42}
43
44export function findService(doc: DidDocument, id: string, type?: string) {
45 // probably not defensive enough, but we don't have atproto/did as a dep...
46 if (!Array.isArray(doc?.service)) return
47 return doc.service.find(
48 s => s?.serviceEndpoint && s?.id === id && (!type || s?.type === type),
49 )
50}
51
52export async function resolvePdsServiceUrl(did: Did) {
53 const doc = await resolveDidDocument(did)
54 return findService(doc, '#atproto_pds', 'AtprotoPersonalDataServer')
55 ?.serviceEndpoint
56}
57
58export function useDidDocument({did}: {did: string}) {
59 return useQuery<DidDocument | undefined>({
60 staleTime: STALE.HOURS.ONE,
61 queryKey: RQKEY(did || ''),
62 async queryFn() {
63 if (!isDid(did)) return undefined
64 return await resolveDidDocument(did)
65 },
66 enabled: isDid(did) && !(did.includes('#') || did.includes('?')),
67 })
68}