Rewrite http protocol to https for DSI redirect (#34)

within ACA a container runs on http, though available as https this causes the OIDC redirect_url to have the http protocol, rather than https DSI does not allow http. The following changes rewrites the URL,

SAB-328

Author: markysoft

src/SchoolAccount.Web.Mvc/Authentication/Extensions/ServiceCollectionExtensions.cs

@@ -53,6 +53,17 @@ IConfigurationManager configuration
                         context.HttpContext.Session.Clear();
                         await Task.CompletedTask;
                     },
+                    // within ACA a container runs on http, though available as https publicly
+                    // this causes the OIDC redirect_url to have the http protocol, rather than https
+                    // DSI does not allow http redirect URLS. The following corrects the URL
+                    OnRedirectToIdentityProvider = async n =>
+                    {
+                        n.ProtocolMessage.RedirectUri = n.ProtocolMessage.RedirectUri.Replace(
+                            "http://",
+                            "https://"
+                        );
+                        await Task.CompletedTask;
+                    },
                 };
             });