Add project files.

MyOffice.Core/Identity/IExternalProviderValidator.cs

@@ -0,0 +1,47 @@
+namespace MyOffice.Core.Identity;
+
+using System;
+using System.Diagnostics.Contracts;
+
+public interface IExternalProviderValidator
+{
+	string Provider { get; }
+	public bool IsConfigured { get; }
+
+	Task<ExternalProviderValidatorResult> ValidateAsync(string token);
+}
+
+public class ExternalProviderValidatorResult
+{
+	public static ExternalProviderValidatorResult Failed()
+	{
+		return new ExternalProviderValidatorResult();
+	}
+
+	public static ExternalProviderValidatorResult Success(string email, bool emailVerified, string externalId,
+		string? fullName)
+	{
+		return new ExternalProviderValidatorResult(email, emailVerified, externalId, fullName);
+	}
+
+	public ExternalProviderValidatorResult()
+	{
+		IsSuccessed = false;
+	}
+
+	public ExternalProviderValidatorResult(string email, bool emailVerified, string externalId, string? fullName) :
+		this()
+	{
+		Email = email;
+		EmailVerified = emailVerified;
+		IsSuccessed = true;
+		ExternalId = externalId;
+		FullName = fullName;
+	}
+
+	public bool IsSuccessed { get; }
+	public string? Email { get; }
+	public bool EmailVerified { get; }
+	public string? ExternalId { get; }
+	public string? FullName { get; }
+}