question

Hi @PabloGlomby-5415,

You could use Graph api to get file name from sharing link. You could refer to this article: https://docs.microsoft.com/en-us/graph/api/shares-get?view=graph-rest-1.0&tabs=csharp#code-try-2

First you need to ecode the sharing URL:

 string sharingUrl = "https://onedrive.live.com/redir?resid=1231244193912!12&authKey=1201919!12921!1";
 string base64Value = System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(sharingUrl));
 string encodedUrl = "u!" + base64Value.TrimEnd('=').Replace('/','_').Replace('+','-');

With the encodedurl, you could use the endpoint to get the shared file:

 GET /shares/{shareIdOrEncodedSharingUrl}

Below is my test:

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Hi @PabloGlomby-5415,

You may misunderstand me. I understand that Peter can only login as Peter. But peter needs to requested the file in the browser firstly.

Consider this scenario: "Pablo" shared a file use "Anyone with the link can view". Peter received the link from Pablo. Peter would get 401 unauthorized error when run graph api to get the file name. This is normal, because graph doesn't know peter has access to this file. Peter needs to request the file in the browser first, thus graph know he has access to the file. After peter requested the file (with the sharing link) in the browser, he could run graph api query successfully.

As a workaround, you could also make a request to the file in c# with the below code. Thus the user could run the query successfully.

 String name = "user1@teanant.onmicrosoft.com";
 String password = "password";
   
 SecureString securePassword = new SecureString();
 foreach (char c in password.ToCharArray())
 {
     securePassword.AppendChar(c);
 }
 String sharingLink = "https://MYTENANT-my.sharepoint.com/:w:/p/pablo/EWkIoUESiylKrOEglXilrkoBf1eat8RNe35sA0JYvaEzjg";

 var credentials = new SharePointOnlineCredentials(name, securePassword);
 var authCookie = credentials.GetAuthenticationCookie(new Uri(sharingLink));
 var cookieContainer = new CookieContainer();
 cookieContainer.SetCookies(new Uri(sharingLink), authCookie);
 var request = (HttpWebRequest)WebRequest.Create(sharingLink);
 request.CookieContainer = cookieContainer;

 var result = (HttpWebResponse)request.GetResponse();