EWS GetUserPhoto switch from Basic Auth to OAuth

Question

I have been using Basic Auth to get user photo as below.

string email = "SomeEmail@email.com";

HttpWebRequest request = WebRequest.Create(string.Format("https://outlook.office365.com/EWS/Exchange.asmx/s/GetUserPhoto?email={0}&size=HR648x648", email)) as HttpWebRequest;
request.Credentials = new NetworkCredential("SomeID", "SomePwd");

using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
       Stream stream = response.GetResponseStream();
       using (MemoryStream ms = new MemoryStream())
       {
           string encodedPhoto = Convert.ToBase64String((ms.ToArray()));
       }
}

But since Basic Authentication for EWS will be decommissioned, I'm trying to use OAuth 2.0 for the same request. This is what I've tried so far.

var pcaOptions = new PublicClientApplicationOptions
{
     ClientId = ConfigurationManager.AppSettings["appId"],
     TenantId = ConfigurationManager.AppSettings["tenantId"]
};

var pca = PublicClientApplicationBuilder.CreateWithApplicationOptions(pcaOptions).Build();
var ewsScopes = new string[] { "https://outlook.office365.com/EWS.AccessAsUser.All" };
var authResult = await pca.AcquireTokenInteractive(ewsScopes).ExecuteAsync();

var ewsClient = new ExchangeService();

string email = "SomeEmail@Email.com";
ewsClient.Url = new Uri(string.Format("https://outlook.office365.com/EWS/Exchange.asmx/s/GetUserPhoto?email={0}&size=HR648x648", email));
ewsClient.Credentials = new OAuthCredentials(authResult.AccessToken);

How can I proceed to get user photo from here? Any help or information will be very much appreciated.

Answer 1

You don't need to use the EWS Managed API you can just modify you existing code to include the Access token eg

   string email = "SomeEmail@email.com";

   HttpWebRequest request = WebRequest.Create(string.Format("https://outlook.office365.com/EWS/Exchange.asmx/s/GetUserPhoto?email={0}&size=HR648x648", email)) as HttpWebRequest;
   request.Headers.Add("Authorization", "Bearer " + authResult.AccessToken);

 using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
 {
    Stream stream = response.GetResponseStream();
    using (MemoryStream ms = new MemoryStream())
    {
        string encodedPhoto = Convert.ToBase64String((ms.ToArray()));
    }
 }

or if you do want to use the EWS managed API you can use something like

    String ETag = "";
    GetUserPhotoResults grPhoto = service.GetUserPhoto("user@domain.com", "HR240x240", ETag);
    if (grPhoto.Status == GetUserPhotoStatus.PhotoReturned) 
    {
        ETag = grPhoto.EntityTag; 
    }
    grPhoto = service.GetUserPhoto("user@domain.com", "HR240x240", ETag);
    switch (grPhoto.Status) 
    {
        case GetUserPhotoStatus.PhotoReturned: ETag = grPhoto.EntityTag;
            break;
        case GetUserPhotoStatus.PhotoUnchanged:
            Console.WriteLine("Photo Unchanged");
            break;
    }