Bind .NET query string to property

Question

I am working with Microsoft's Verifiable Credentials sample: https://github.com/Azure-Samples/active-directory-verifiable-credentials-dotnet/tree/main/1-asp-net-core-api-idtokenhint

Rather than use fixed contact values as per the test (see IssuerController.cs), I want to use query params from a form I have added to the Index page (e.g. an input called "firstname"). I can see the params in the results page URL, however I cannot find a way to set these correctly.

I've tried a few methods in IssuerController.cs. First by amending the static value to a query request:

payload["issuance"]["claims"]["given_name"] = HttpContext.Request.Query["firstname"].ToString();

I've also tried setting a property:

[FromQuery(Name = "firstname")]
public string firstname { get; set; }

And then adding the property to the payload:

payload["issuance"]["claims"]["given_name"] = firstname;

Sadly all of this results in the same error:

"Missing provided claims in issuance: [given_name]","target":"issuance.claims"

For reference, the method signature is

public async Task<ActionResult> IssuanceRequest()

As you may gather, I am not savvy with .NET.

What is the correct way to do this please? Thanks

Answer 1

If I understand correctly, you just can add a parameter to you action method like this:

public async Task<ActionResult> IssuanceRequest(string firstname)

Or add a FromQuery attribute if you want to specify a source of a value, and name of query parameter (optional):

public async Task<ActionResult> IssuanceRequest([FromQuery(Name = "firstname"]string firstname)

Answer 2

Right, I'm sure there are other ways to do this but we got it working in the end by amending the IssuanceRequest method in Issuer.cshtml

fetch('/api/issuer/issuance-request?firstName=@HttpContext.Request.Query["firstName"].ToString()&lastName=@HttpContext.Request.Query["lastName"].ToString()&email=@HttpContext.Request.Query["email"].ToString()&phone=@HttpContext.Request.Query["phone"].ToString()')

Thanks for the help anyway