Downloading files, setting cookie expiry SPOIDCRL

Question

I'm looking to download multiple files from a SharePoint site and upload them to another cloud provider. I've done some testing and it looks like I only have to add the cookie to the cookie container on the HttpWebRequest. When setting the cookie expiry date

Expires = DateTime.Now.AddSeconds(30)

The download throws a 403 which is expected. I was hoping I could set for it for 5 days. I guess the question is, is there max expiry date that can be set for the SPOIDCRL cookie? Will I need to re authenticate at any point?

Answer 1

According to SharePointOnlineCredentials class from SharePoint Online Client Components SDK the expiry date for authentication cookie (SPOIDCRL) should be set to 1 hour

The following example demonstrates how to provide SPOIDCRL HTTP header in order to perform request authentication in SharePoint Online/Office 365:

var request = (HttpWebRequest)WebRequest.Create(endpointUri);
var credentials = new SharePointOnlineCredentials(userName,securePassword);
var authCookie = credentials.GetAuthenticationCookie(webUri);
request.Headers.Add(HttpRequestHeader.Cookie, authCookie);