public async Task <List <DkimSelectorRecords> > FetchDkimRecords(string domain, List <string> selectors)
{
List <DkimSelectorRecords> txtRecords = new List <DkimSelectorRecords>();
foreach (string selector in selectors)
{
string host = $"{selector.Trim().ToLower()}._domainkey.{domain.Trim().ToLower()}";
DkimSelectorRecords record;
try
{
IDnsQueryResponse response = await _lookupClient.QueryAsync(host, QueryType.TXT);
if (response.HasError)
{
_log.LogInformation($"Host: {host}");
Guid Id1 = Guid.Parse("3956C316-5A86-47D3-B5DD-5F5418C0D5C8");
record = new DkimSelectorRecords(Id1, selector, null, null, response.MessageSize,
string.Format(DkimServiceResources.DnsLookupFailedErrorMessage, host, response.ErrorMessage),
string.Format(DkimServiceMarkdownResources.DnsLookupFailedErrorMessage, host, response.ErrorMessage));
}
else
{
Guid Id2 = Guid.Parse("FB710D51-5F2B-47EA-A836-FF4CCFDC30A2");
IEnumerable <CNameRecord> cnameRecords = response.Answers.OfType <CNameRecord>().ToList();
string dkimCNameRecords = cnameRecords.Any()
? cnameRecords.First().CanonicalName
: null;
List <DkimTxtRecord> dkimTxtRecords = response.Answers.OfType <TxtRecord>().Select(_ => new DkimTxtRecord(_.Text.Select(r => r.Escape()).ToList())).ToList();
record = new DkimSelectorRecords(Id2, selector, dkimTxtRecords, dkimCNameRecords, response.MessageSize);
}
}
catch (Exception ex)
{
Guid Id3 = Guid.Parse("8DE3D4F8-F1BD-45FF-B289-9A7D23FDC3F4");
record = new DkimSelectorRecords(Id3, selector, null, null, 0, ex.Message, DkimServiceMarkdownResources.UnknownErrorWhenPollingErrorMessage);
string formatString = $"{{ExceptionType}} occured when polling DKIM record for host {{Host}} {Environment.NewLine} {{StackTrace}}";
_log.LogWarning(formatString, host, ex.GetType().Name, ex.StackTrace);
}
txtRecords.Add(record);
}
return(txtRecords);
}
private static DkimSelectorResult MapToSelectorResult(DkimSelectorRecords dkimSelectorRecords)
{
return(new DkimSelectorResult(ToContractSelector(dkimSelectorRecords.Selector), dkimSelectorRecords.Records.Select(MapToRecordResult).ToList()));
}