Feature/488068 auth common backend and accounts apis

src/EprPrnIntegration.Api/HostBuilderConfiguration.cs

@@ -53,8 +53,8 @@ private static void ConfigureServices(IConfiguration configuration, IServiceColl
         services.AddTransient<NpwdOAuthMiddleware>();
 
         // Add HttpClients
-        services.AddHttpClient(Common.Constants.HttpClientNames.Npwd)
-            .AddHttpMessageHandler<NpwdOAuthMiddleware>();
+        services.AddHttpClient(Common.Constants.HttpClientNames.Npwd).AddHttpMessageHandler<NpwdOAuthMiddleware>();
+        services.AddHttpClient(Common.Constants.HttpClientNames.Prn).AddHttpMessageHandler<PrnServiceAuthorisationHandler>();
 
         services.AddServiceBus(configuration);
         services.ConfigureOptions(configuration);

src/EprPrnIntegration.Common/Configuration/Service.cs

@@ -12,4 +12,5 @@ public class Service
     public int? Retries { get; set; }
     public string? PrnBaseUrl { get; set; }
     public string? PrnEndPointName { get; set; }
+    public string? ClientId { get; set; }
 }

src/EprPrnIntegration.Common/Constants/Constants.cs

@@ -3,6 +3,8 @@
     public static class HttpClientNames
     {
         public const string Npwd = "NpwdClient";
+        public const string Prn = "PrnClient";
+
     }
 
     public static class HttpHeaderNames

src/EprPrnIntegration.Common/Middleware/PrnServiceAuthorisationHandler.cs

@@ -0,0 +1,38 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Net.Http.Headers;
+using Azure.Core;
+using Azure.Identity;
+using Microsoft.Extensions.Options;
+
+namespace EprPrnIntegration.Common.Middleware;
+
+[ExcludeFromCodeCoverage]
+public class PrnServiceAuthorisationHandler : DelegatingHandler
+{
+    private readonly TokenRequestContext _tokenRequestContext;
+    private readonly DefaultAzureCredential? _credentials;
+
+    public PrnServiceAuthorisationHandler(IOptions<Configuration.Service> config)
+    {
+        if (!string.IsNullOrEmpty(config.Value.ClientId))
+        {
+            _tokenRequestContext = new TokenRequestContext([config.Value.ClientId]);
+            _credentials = new DefaultAzureCredential();
+        }
+    }
+
+    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+    {
+        await AddDefaultToken(request, cancellationToken);
+        return await base.SendAsync(request, cancellationToken);
+    }
+
+    private async Task AddDefaultToken(HttpRequestMessage request, CancellationToken cancellationToken)
+    {
+        if (_credentials != null)
+        {
+            var tokenResult = await _credentials.GetTokenAsync(_tokenRequestContext, cancellationToken);
+            request.Headers.Authorization = new AuthenticationHeaderValue(Constants.HttpHeaderNames.Bearer, tokenResult.Token);
+        }
+    }
+}