dotnet user-jwts create throws exception if launch settings file not found

[martincostello]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

If dotnet user-jwts create is run from a current directory other than the project directory (e.g. accidentally running it at the repo root instead of the child folder containing a web application) then an unhandled exception is thrown and printed to the console.

❯ dotnet user-jwts create
Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
   at System.ArgumentNullException.Throw(String paramName)
   at System.IO.Path.Combine(String path1, String path2, String path3)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.DevJwtCliHelpers.GetAudienceCandidatesFromLaunchSettings(String project)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.CreateCommand.ValidateArguments(IReporter reporter, CommandOption projectOption, CommandOption schemeNameOption, CommandOption nameOption, CommandOption audienceOption, CommandOption issuerOption, CommandOption notBeforeOption, CommandOption expiresOnOption, CommandOption validForOption, CommandOption rolesOption, CommandOption scopesOption, CommandOption claimsOption)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.CreateCommand.<>c__DisplayClass2_0.<Register>b__1()
   at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.Program.Run(String[] args)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.Program.Main(String[] args)

Expected Behavior

A user-friendly error message is shown, perhaps indicating that an expected file cannot be found, which guides the user as to their mistake.

Steps To Reproduce

The exception can be readily reproduced by running the command at the root of a drive.

cd c:/
dotnet user-jwts create

Exceptions (if any)

Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
   at System.ArgumentNullException.Throw(String paramName)
   at System.IO.Path.Combine(String path1, String path2, String path3)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.DevJwtCliHelpers.GetAudienceCandidatesFromLaunchSettings(String project)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.CreateCommand.ValidateArguments(IReporter reporter, CommandOption projectOption, CommandOption schemeNameOption, CommandOption nameOption, CommandOption audienceOption, CommandOption issuerOption, CommandOption notBeforeOption, CommandOption expiresOnOption, CommandOption validForOption, CommandOption rolesOption, CommandOption scopesOption, CommandOption claimsOption)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.CreateCommand.<>c__DisplayClass2_0.<Register>b__1()
   at Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(String[] args)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.Program.Run(String[] args)
   at Microsoft.AspNetCore.Authentication.JwtBearer.Tools.Program.Main(String[] args)

.NET Version

7.0.100-preview.5.22307.18

Anything else?

No response

[martincostello]

I think this also happens if there's more than one .csproj file in the same folder.