Implemented Core client

Cloudflare/Auth/ApiKeyAuthentication.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Net.Http;
+using System.Text.RegularExpressions;
+
+namespace AMWD.Net.Api.Cloudflare.Auth
+{
+	/// <summary>
+	/// Implements the interface to authenticate using an API key and email address.
+	/// </summary>
+	public class ApiKeyAuthentication : IAuthentication
+	{
+		private static readonly Regex _emailCheckRegex = new(@"^[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$", RegexOptions.Compiled);
+		private readonly string _emailAddress;
+		private readonly string _apiKey;
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="ApiKeyAuthentication"/> class.
+		/// </summary>
+		/// <param name="emailAddress">The email address.</param>
+		/// <param name="apiKey">The global API key.</param>
+		public ApiKeyAuthentication(string emailAddress, string apiKey)
+		{
+			if (string.IsNullOrWhiteSpace(emailAddress))
+				throw new ArgumentNullException(nameof(emailAddress));
+
+			if (string.IsNullOrWhiteSpace(apiKey))
+				throw new ArgumentNullException(nameof(apiKey));
+
+			if (!_emailCheckRegex.IsMatch(emailAddress))
+				throw new ArgumentException("Invalid email address", nameof(emailAddress));
+
+			_emailAddress = emailAddress;
+			_apiKey = apiKey;
+		}
+
+		/// <inheritdoc />
+		public void AddHeader(HttpClient httpClient)
+		{
+			httpClient.DefaultRequestHeaders.Add("X-Auth-Email", _emailAddress);
+			httpClient.DefaultRequestHeaders.Add("X-Auth-Key", _apiKey);
+		}
+	}
+}