How to make authenticated calls using the HttpProvider object from the GraphClientService object?

Question

I'm trying to obtain the content of an image stored in a SharePoint Online list column using the GraphServiceClient instance but, I'm receiving an Unauthorized error.

My code is the following:


// Creating the GET request with the right URL to the image
var message = new HttpRequestMessage(HttpMethod.Get, imageFields.ServerUrl + imageFields.ServerRelativeUrl);

// Waiting for authenticating the request (seems this is not working as expected)
await this._graphService.AuthenticationProvider.AuthenticateRequestAsync(message);

// Requesting data
var response = await this._graphService.HttpProvider.SendAsync(message);

// Retrieving the image content
var content = await response.Content.ReadAsByteArrayAsync();

Let me say that the this._graphService variable is created fine, because, previous to this code, I'm doing a request to obtain the imageFields properties from SharePoint Online with success.

I saw that I have to authenticate the request with the AuthenticationProvider property but, for any unknown reason, it is not working as I expect.

Let me share the way I create the _graphService object to make everything more clear:

public GraphServiceClient Create() {
    var clientSecretCredential = new ClientSecretCredential(
        this._configuration.TenantId, 
        this._configuration.ClientId,
        this._configuration.ClientSecret
    );

    return new GraphServiceClient(clientSecretCredential, this._configuration.Scopes);
}

So, do you know if I can use and how to use a GraphServiceClient instance to make HTTP requests (probably using the HttpProvider property) to retrieve SharePoint Online images stored in a SharePoint Online list in an image column?

How to make authenticated calls using the HttpProvider object from the GraphClientService object?

0 Answers0