getLocallyCachedPK function

Future<String> getLocallyCachedPK(AtClient atClient, String atSign, { FileSystem? fs, })

If the PK for atSign is in the sshnp local cache, then return it. If it is not, then fetch it via the atClient, and store it.

The PK (for e.g. @alice) is stored

• in the atClient's storage if useFileStorage == false in a "local" record like local:alice.cached_pks.sshnp@<atClient's atSign>
• in file storage if useFileStorage == true (default) at ~/.atsign/sshnp/cached_pks/alice

Note that for storage, the leading @ in the atSign is stripped off.

Implementation

Future<String> getLocallyCachedPK(
  AtClient atClient,
  String atSign, {
  FileSystem? fs,
}) async {
  atSign = AtUtils.fixAtSign(atSign);

  String? cachedPK = await _fetchFromLocalPKCache(atClient, atSign, fs: fs);
  if (cachedPK != null) {
    return cachedPK;
  }

  var s = 'public:publickey$atSign';
  final AtValue av = await atClient.get(AtKey.fromString(s));
  if (av.value == null) {
    throw AtPublicKeyNotFoundException('Failed to retrieve $s');
  }

  await _storeToLocalPKCache(av.value, atClient, atSign, fs: fs);

  return av.value;
}