WhoIsChecker is a .NET library for checking the expiration date of domains using WHOIS servers. This library supports multiple target frameworks including .NET Standard 2.1, .NET 6.0, and .NET 7.0.

• Query WHOIS information for domains.
• Extract and convert the domain expiration date to local system time.
• Calculate the number of days until a domain expires.
• Automatically download and use the latest WHOIS server list.

To install WhoIsChecker, add the NuGet package to your project:

dotnet add package WhoIsChecker

Here's an example of how to use the WhoIsChecker library:

1. Load WHOIS Servers: Load the WHOIS servers list from a JSON file or download it if it doesn't exist or is outdated.

2. Query WHOIS Server: Query the WHOIS server for a domain's expiration date.

   using System;
   using System.Threading.Tasks;
   using WhoIsChecker.Data;
   using WhoIsChecker.Services;
   
   class Program
   {
       static async Task Main(string[] args)
       {
           if (args.Length == 0)
           {
               Console.WriteLine("Please provide a domain as an argument.");
               return;
           }
   
           string domain = args[0];
           string tld = GetTld(domain);
   
           var whoisServers = await DomainWhoisServers.LoadAsync();
   
           if (whoisServers.TryGetValue(tld, out string? whoisServer))
           {
               if (whoisServer == null)
               {
                   Console.WriteLine("NO WHOIS SERVER FOUND");
               }
               else
               {
                   var whoisService = new WhoisService();
                   var (expirationDate, message) = await whoisService.QueryWhoisServer(domain, whoisServer);
                   if (expirationDate != null)
                   {
                       Console.WriteLine($"Expiration Date (Local Time): {expirationDate}");
                   }
                   Console.WriteLine(message);
               }
           }
           else
           {
               Console.WriteLine("TLD not found in the list.");
           }
       }
   
       private static string GetTld(string domain)
       {
           var parts = domain.Split('.');
           return parts[^1].ToLower();
       }
   }

To build the library, navigate to the project directory and run the following command:

dotnet build --configuration Release

To create a NuGet package, use the following command:

dotnet pack --configuration Release

This will generate a .nupkg file in the bin/Release directory.

To publish the NuGet package, use the following command:

dotnet nuget push bin/Release/WhoIsChecker.1.0.0.nupkg --api-key YOUR_API_KEY --source https://api.nuget.org/v3/index.json

Replace YOUR_API_KEY wityh your actual NuGet API key.

This project is licensed under the MIT License. See the LICENSE file for details.

Contributions are welcome! Please open an issue or submit a pull request on GitHub.

Special thanks to all the contributors and open-source projects that made this library possible.

For more information, please visit the project page.