Add project files.

Core.Blueprint.Service.External/Helpers/Token/AuthenticatedHttpClientHandler.cs

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+// ***********************************************************************
+// <copyright file="AuthenticatedHttpClientHandler.cs">
+//     Heath
+// </copyright>
+// ***********************************************************************
+
+namespace Core.Blueprint.Service.External.Helpers.Token
+{
+    /// <summary>
+    /// Class to inject the token in all requests.
+    /// </summary>
+    public class AuthenticatedHttpClientHandler : DelegatingHandler
+    {
+        private readonly ITokenProvider _tokenProvider;
+
+        public AuthenticatedHttpClientHandler(ITokenProvider tokenProvider)
+        {
+            _tokenProvider = tokenProvider;
+        }
+
+        protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+        {
+            var token = _tokenProvider.GetToken();
+            if (!string.IsNullOrEmpty(token))
+            {
+                request.Headers.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", token);
+            }
+
+            return await base.SendAsync(request, cancellationToken);
+        }
+    }
+}

Core.Blueprint.Service.External/Helpers/Token/HttpContextTokenProvider.cs

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+// ***********************************************************************
+// <copyright file="HttpContextTokenProvider.cs">
+//     Heath
+// </copyright>
+// ***********************************************************************
+
+using Microsoft.AspNetCore.Http;
+
+namespace Core.Blueprint.Service.External.Helpers.Token
+{
+    /// <summary>
+    /// Class to return the access token to controllers.
+    /// </summary>
+    public class HttpContextTokenProvider : ITokenProvider
+    {
+        private readonly IHttpContextAccessor _httpContextAccessor;
+
+        public HttpContextTokenProvider(IHttpContextAccessor httpContextAccessor)
+        {
+            _httpContextAccessor = httpContextAccessor;
+        }
+
+        /// <summary>
+        /// Get token from headers.
+        /// </summary>
+        public string GetToken()
+        {
+            return _httpContextAccessor.HttpContext?.Request.Headers["Authorization"].FirstOrDefault()?.Split(" ").Last();
+        }
+    }
+}

Core.Blueprint.Service.External/Helpers/Token/ITokenProvider.cs

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+// ***********************************************************************
+// <copyright file="ITokenProvider.cs">
+//     Heath
+// </copyright>
+// ***********************************************************************
+
+namespace Core.Blueprint.Service.External.Helpers.Token
+{
+    /// <summary>
+    /// Interface for token provider.
+    /// </summary>
+    public interface ITokenProvider
+    {
+        /// <summary>
+        /// Get token from headers.
+        /// </summary>
+        string GetToken();
+    }
+}