atmosphere explorer
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import { plcDirectory } from "../views/settings";
const proxyFetch = (rewrite: (url: URL) => string): typeof fetch => { return async (input, init) => { try { return await fetch(input, init); } catch (err) { if (init?.signal?.aborted) throw err; const url = new URL( typeof input === "string" ? input : input instanceof URL ? input.href : input.url, ); return fetch(rewrite(url)); } };};
const didWebProxyFetch = proxyFetch( (url) => `/resolve-did-web?host=${encodeURIComponent(url.host)}`,);const dnsProxyFetch = proxyFetch( (url) => `/resolve-handle-dns?handle=${encodeURIComponent(url.searchParams.get("name")?.replace("_atproto.", "") ?? "")}`,);const handleHttpProxyFetch = proxyFetch( (url) => `/resolve-handle-http?handle=${encodeURIComponent(url.host)}`,);
export const didDocumentResolver = createMemo( () => new CompositeDidDocumentResolver({ methods: { plc: new PlcDidDocumentResolver({ apiUrl: plcDirectory(), }), web: new AtprotoWebDidDocumentResolver({ fetch: didWebProxyFetch }), }, }),);
export const handleResolver = new CompositeHandleResolver({ strategy: "dns-first", methods: { dns: new DohJsonHandleResolver({ dohUrl: "https://dns.google/resolve?", fetch: dnsProxyFetch }), http: new WellKnownHandleResolver({ fetch: handleHttpProxyFetch }), },});
const authorityResolver = new DohJsonLexiconAuthorityResolver({ dohUrl: "https://dns.google/resolve?",});
const schemaResolver = createMemo( () => new LexiconSchemaResolver({ didDocumentResolver: didDocumentResolver(), }),);
const didPDSCache: Record<string, Promise<string>> = {};const [labelerCache, setLabelerCache] = createStore<Record<string, string>>({});const didDocCache: Record<string, DidDocument> = {};const getPDS = (did: string): Promise<string> => { if (did in didPDSCache) return didPDSCache[did];
if (!isAtprotoDid(did)) { return Promise.reject(new Error("Not a valid DID identifier")); }
didPDSCache[did] = (async () => { let doc: DidDocument; try { doc = await didDocumentResolver().resolve(did); didDocCache[did] = doc; } catch (e) { console.error(e); delete didPDSCache[did]; throw new Error("Error during did document resolution"); }
const pds = getPdsEndpoint(doc); const labeler = getLabelerEndpoint(doc);
if (labeler) { setLabelerCache(did, labeler); }
if (!pds) { delete didPDSCache[did]; throw new Error("No PDS found"); }
return pds; })();
return didPDSCache[did];};
const resolveHandle = async (handle: Handle) => { if (!isHandle(handle)) { throw new Error("Not a valid handle"); }
return await handleResolver.resolve(handle);};
const resolveDidDoc = async (did: Did) => { if (!isAtprotoDid(did)) { throw new Error("Not a valid DID identifier"); } return await didDocumentResolver().resolve(did);};
const validateHandle = async (handle: Handle, did: Did) => { if (!isHandle(handle)) return false;
let resolvedDid: string; try { resolvedDid = await handleResolver.resolve(handle); } catch (err) { console.error(err); return false; } if (resolvedDid !== did) return false; return true;};
const resolveLexiconAuthority = async (nsid: Nsid) => { return await authorityResolver.resolve(nsid);};
const resolveLexiconAuthorityDirect = async (authority: string) => { const dohUrl = "https://dns.google/resolve?"; const reversedAuthority = authority.split(".").reverse().join("."); const domain = `_lexicon.${reversedAuthority}`; const url = new URL(dohUrl); url.searchParams.set("name", domain); url.searchParams.set("type", "TXT");
const response = await fetch(url.toString()); if (!response.ok) { throw new Error(`Failed to resolve lexicon authority for ${authority}`); }
const data = await response.json(); if (!data.Answer || data.Answer.length === 0) { throw new Error(`No lexicon authority found for ${authority}`); }
const txtRecord = data.Answer[0].data.replace(/"/g, "");
if (!txtRecord.startsWith("did=")) { throw new Error(`Invalid lexicon authority record for ${authority}`); }
return txtRecord.replace("did=", "");};
const resolveLexiconSchema = async (authority: AtprotoDid, nsid: Nsid) => { return await schemaResolver().resolve(authority, nsid);};
interface LinkData { links: { [key: string]: { [key: string]: { records: number; distinct_dids: number; }; }; };}
type LinksWithRecords = { cursor: string; total: number; linking_records: Array<{ did: string; collection: string; rkey: string }>;};
const getConstellation = async ( endpoint: string, target: string, collection?: string, path?: string, cursor?: string, limit?: number,) => { const url = new URL("https://constellation.microcosm.blue"); url.pathname = endpoint; url.searchParams.set("target", target); if (collection) { if (!path) throw new Error("collection and path must either both be set or neither"); url.searchParams.set("collection", collection); url.searchParams.set("path", path); } else { if (path) throw new Error("collection and path must either both be set or neither"); } if (limit) url.searchParams.set("limit", `${limit}`); if (cursor) url.searchParams.set("cursor", `${cursor}`); const res = await fetch(url, { signal: AbortSignal.timeout(5000) }); if (!res.ok) throw new Error("failed to fetch from constellation"); return await res.json();};
const getAllBacklinks = (target: string): Promise<LinkData> => getConstellation("/links/all", target);
const getRecordBacklinks = ( target: string, collection: string, path: string, cursor?: string, limit?: number,): Promise<LinksWithRecords> => getConstellation("/links", target, collection, path, cursor, limit || 100);
export interface HandleResolveResult { success: boolean; did?: string; error?: string;}
export const resolveHandleDetailed = async (handle: Handle) => { const dnsResolver = new DohJsonHandleResolver({ dohUrl: "https://dns.google/resolve?" }); const httpResolver = new WellKnownHandleResolver({ fetch: handleHttpProxyFetch });
const tryResolve = async ( resolver: DohJsonHandleResolver | WellKnownHandleResolver, timeoutMs: number = 5000, ): Promise<HandleResolveResult> => { try { const timeoutPromise = new Promise<never>((_, reject) => setTimeout(() => reject(new Error("Request timed out")), timeoutMs), ); const did = await Promise.race([resolver.resolve(handle), timeoutPromise]); return { success: true, did }; } catch (err: any) { return { success: false, error: err.message ?? String(err) }; } };
const [dns, http] = await Promise.all([tryResolve(dnsResolver), tryResolve(httpResolver)]);
return { dns, http };};
export { didDocCache, getAllBacklinks, getPDS, getRecordBacklinks, labelerCache, resolveDidDoc, resolveHandle, resolveLexiconAuthority, resolveLexiconAuthorityDirect, resolveLexiconSchema, validateHandle, type LinksWithRecords,};