Best way to generate shareable URL from on prem Windows application's generated file

Question

Hey All,

I am a systems guy who recently migrated to O365/Azure infrastructure. I have a team that develops a .NET Windows application and am trying to figure out the best path for creating an externally shareable URL from a file generated by the app. The app is used by customers which during a process generates a PDF and need to call an API to pass the downloadable URL for that PDF. I poked around graph and the documentation is really difficult to find a clear path to accomplish this and keep running into access denied issues even when I use my global admin account. I need to stay away from any user authentication and don't really need historical record of the files persisted, just to create a URL that can be shared to the next API call.

Any suggestions?

Answer 1

Hi @Cory Calavan ,

You could use MS Graph Create a sharing link for a DriveItem to create an externally shareable URLfor a file: https://learn.microsoft.com/en-us/graph/api/driveitem-createlink?view=graph-rest-1.0&tabs=http

For example POST /sites/{siteId}/drive/items/{itemId}/createLink

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Answer 2

@MichaelHan-MSFT

Thanks for the reply. I figured this would be the end result but I'm struggling getting the application auth to work for writing the file to sharepoint. I assume that is the first step right? Persist the file to SharePoint then use this to generate the shareable link? I think the issue is up until now we've used a token that is delegated and tied to a user. For this i'm trying to use an Application token and I am having issues getting that into the code and authenticated - keep getting Access Denied for the write. I can get info on the SP site but can't write the file. I tried throwing every SP/MS Graph permission to it as I could. Any suggestions?