Add client_id to analytics events (#736)

dotnet-authserver/src/TeacherIdentity.AuthServer/Infrastructure/Middleware/AppendAuthorizationInfoToAnalyticsEventsMiddleware.cs

@@ -0,0 +1,38 @@
+using Dfe.Analytics.AspNetCore;
+
+namespace TeacherIdentity.AuthServer.Infrastructure.Middleware;
+
+public class AppendAuthorizationInfoToAnalyticsEventsMiddleware
+{
+    private readonly RequestDelegate _next;
+
+    public AppendAuthorizationInfoToAnalyticsEventsMiddleware(RequestDelegate next)
+    {
+        _next = next;
+    }
+
+    public Task Invoke(HttpContext context)
+    {
+        var analyticsEvent = context.GetWebRequestEvent();
+        var clientRedirectInfo = context.GetClientRedirectInfo();
+
+        if (context.TryGetAuthenticationState(out var authenticationState))
+        {
+            if (!string.IsNullOrEmpty(authenticationState.SessionId))
+            {
+                analyticsEvent.AddData("session_id", authenticationState.SessionId);
+            }
+
+            if (authenticationState.TryGetOAuthState(out var oAuthState))
+            {
+                analyticsEvent.AddData("client_id", oAuthState.ClientId);
+            }
+        }
+        else if (clientRedirectInfo is not null)
+        {
+            analyticsEvent.AddData("client_id", clientRedirectInfo.ClientId);
+        }
+
+        return _next(context);
+    }
+}

dotnet-authserver/src/TeacherIdentity.AuthServer/Program.cs

@@ -608,7 +608,7 @@ public static async Task Main(string[] args)
                 a =>
                 {
                     a.UseDfeAnalytics();
-                    a.UseMiddleware<Infrastructure.Middleware.AppendSessionIdToAnalyticsEventsMiddleware>();
+                    a.UseMiddleware<Infrastructure.Middleware.AppendAuthorizationInfoToAnalyticsEventsMiddleware>();
                 });
         }