public async Task <ActionResult> Hostname(string ipAddress)
{
string hostname = null;
try {
IPAddress hostIPAddress = IPAddress.Parse(ipAddress);
hostname = (await Dns.GetHostEntryAsync(hostIPAddress)).HostName;
if (!string.IsNullOrEmpty(hostname) && hostname != ipAddress)
{
await LogMessageRelay.StoreHostname(ipAddress, hostname);
}
}
catch (Exception ex) {
_logMessageRelay.SendMessage($"ERROR: {ipAddress} => {ex.Message}");
}
return(Content(string.IsNullOrEmpty(hostname) ? ipAddress : hostname));
}
public async Task <ActionResult> Description([FromQuery] DescriptionRequest descriptionRequest)
{
try {
// if there is no IP address info in the request, then returns
// the description stored in the database if there is one
if (string.IsNullOrEmpty(descriptionRequest.ipAddress))
{
var www = $"www.{descriptionRequest.domain}";
LogMessageRelay.DescriptionsStorage.TryGetValue(descriptionRequest.domain, out string description);
if (string.IsNullOrEmpty(description) && !descriptionRequest.domain.StartsWith("www."))
{
LogMessageRelay.DescriptionsStorage.TryGetValue(www, out description);
}
return(new JsonResult(new Description {
icon = LogMessageRelay.GetIcon(descriptionRequest.domain) ?? LogMessageRelay.GetIcon(www),
description = description
}));
}
ServicePointManager.SecurityProtocol
= SecurityProtocolType.Tls
| SecurityProtocolType.Tls11
| SecurityProtocolType.Tls12;
ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;
return(await Description(new Uri(descriptionRequest.url), descriptionRequest));
}
catch (Exception ex) {
_logMessageRelay.SendMessage($"ERROR: {descriptionRequest.domain} => {ex.Message}");
}
return(Content(null));
}
public async Task Hostname(string ipAddress, [FromForm] string hostname)
{
await LogMessageRelay.StoreHostname(ipAddress, hostname);
}
public ResolveController(LogMessageRelay logMessageRelay)
{
_logMessageRelay = logMessageRelay;
}
private async Task <ActionResult> Description(HtmlDocument document, DescriptionRequest descriptionRequest)
{
var result = new Description();
if (document == null || string.IsNullOrEmpty(descriptionRequest.url))
{
return(Content(null));
}
var metaTags = document.DocumentNode.SelectNodes("//meta");
if (metaTags != null)
{
foreach (var tag in metaTags)
{
var name = tag.Attributes["name"];
var content = tag.Attributes["content"];
if (name != null && name.Value == "description" && content != null)
{
result.description = content.Value;
break;
}
}
}
var linkTags = document.DocumentNode.SelectNodes("//link");
if (linkTags != null)
{
foreach (var tag in linkTags)
{
var rel = tag.Attributes["rel"];
var href = tag.Attributes["href"];
if (rel != null && rel.Value.Contains("icon") && href != null)
{
result.icon = href.Value;
if (!result.icon.StartsWith("data:"))
{
if (result.icon.StartsWith("//"))
{
result.icon = descriptionRequest.protocol + ":" + result.icon;
}
else if (result.icon.StartsWith("/"))
{
result.icon = descriptionRequest.GetBaseUrl() + result.icon;
}
else if (!result.icon.StartsWith("http"))
{
result.icon = descriptionRequest.GetBaseUrl() + "/" + result.icon;
}
result.icon = await DownloadIcon(new Uri(result.icon), descriptionRequest);
}
break;
}
}
}
var titleTag = document.DocumentNode.SelectSingleNode("//title");
if (titleTag != null)
{
result.title = titleTag.InnerHtml;
}
// download the icon from the default location if the icon
// cannot be retrieved from the document
if (result.icon == null)
{
result.icon = await DownloadIcon(new Uri(string.Format("{0}://{1}/favicon.ico",
descriptionRequest.protocol, descriptionRequest.domain)), descriptionRequest);
}
if (!string.IsNullOrEmpty(result.description))
{
await LogMessageRelay.StoreDescription(descriptionRequest.domain, result.description);
}
result.bodyText = document.DocumentNode.SelectSingleNode("//body").ToPlainText();
return(new JsonResult(result));
}
