MISE - OwinTokenAcquirerFactory Null exception during startup

[jmprieur]

Microsoft.Identity.Web Library

Microsoft.Identity.Web

Microsoft.Identity.Web version

Latest

Web app

Not Applicable

Web API

Protected web APIs call downstream web APIs

Token cache serialization

In-memory caches

Description

application is currently running on .NetFramework 4.7.2 and using Microsoft.Identity.Web.OWIN package,

The application is getting Null exception at line
OwinTokenAcquirerFactory tokenAcquirerFactory = TokenAcquirerFactory.GetDefaultInstance();

on investigating, it the source code for OwinTokenAcquirerFactory

          ["AzureAd:Instance"] = EnsureTrailingSlash(ConfigurationManager.AppSettings["ida:Instance"] ?? ConfigurationManager.AppSettings["ida:AADInstance"] ?? "https://login.microsoftonline.com/"),
                ["AzureAd:ClientId"] = ConfigurationManager.AppSettings["ida:ClientId"],
                ["AzureAd:TenantId"] = ConfigurationManager.AppSettings["ida:Tenant"] ?? ConfigurationManager.AppSettings["ida:TenantId"],
                ["AzureAd:Audience"] = ConfigurationManager.AppSettings["ida:Audience"],
                ["AzureAd:ClientSecret"] = ConfigurationManager.AppSettings["ida:ClientSecret"],
                ["AzureAd:SignedOutCallbackPath"] = ConfigurationManager.AppSettings["ida:PostLogoutRedirectUri"],
                ["AzureAd:RedirectUri"] = ConfigurationManager.AppSettings["ida:RedirectUri"],
            });
            return HttpContext.Current.Request.PhysicalApplicationPath;
        }

HttpContext.Current.Request.PhysicalApplicationPath throwing the null exception as the code executed during the startup of application, there will be no HttpContext.Current.Request

Reproduction steps

See above

Error message

NRE

Id Web logs

NRE

Relevant code snippets

See above

Regression

No regression

Expected behavior

no NRE

[jmprieur]

We could use:

PhysicalApplicationPath = HostingEnvironment.MapPath("~/");

which would work even when there is no request