All files / src/common api.ts

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import * as dns from '../dns'
import { setup } from '../setup/internal'
 
 
const didCache: {
  did: string | null
  host: string | null
  lastFetched: number
} = {
  did: null,
  host: null,
  lastFetched: 0,
}
 
 
/**
 * Lookup the DID of a Fission API.
 * This function caches the DID for 3 hours.
 */
export async function did(): Promise<string> {
  const host = setup.endpoints.api.replace(/^https?:\/\//, '').replace(/\/$/, '')
  const now = Date.now() // in milliseconds
 
  if (
    didCache.host !== host ||
    didCache.lastFetched + 1000 * 60 * 60 * 3 <= now
  ) {
    didCache.did = await dns.lookupTxtRecord('_did.' + host)
    didCache.host = host
    didCache.lastFetched = now
  }
 
  Iif (!didCache.did) throw new Error("Couldn't get the Fission API DID")
  return didCache.did
}