Downloading Forwarded Attachments From Teams Chat via Microsoft Graph API

Question

I am trying to download a forwarded attachment using Microsoft Graph API. The scenario is as follows:

Person A sends an attachment to Person B. Person B then forwards the attachment to me. When I attempt to download the attachment using the following Graph API request: GET /shares/{shareIdOrUrl}/driveItem 'https://learn.microsoft.com/en-us/graph/api/shares-get'

I receive the following error:

{

"code": "invalidRequest",

"message": "Share URL does not point to a drive item or no permission to access it."

}

However, if either Person A or Person B grants me access via the Teams app, I can successfully retrieve the downloadUrl and no longer encounter this error.

Is there an API that I can invoke to programmatically grant access so that I can retrieve the downloadUrl without requiring manual intervention?

Any guidance or alternative approaches would be greatly appreciated.

Answer 1

Hi Mustafa Salihi,

As per Microsoft documentation, you can grant users access to a link represented by a permission using the following API:

POST https://graph.microsoft.com/v1.0/shares/{encoded-sharing-url}/permission/grant
Content-type: application/json
 
{
  "recipients": [
    {
      "email": ******@contoso.com
    },
    {
      "email": ******@external.com
    }
  ],
  "roles": ["read"]
}
 

This API allows you to specify the recipients and the roles (e.g., "read") to grant access to the shared link. The action to grant access to the shared file should be performed by the owner of the file or someone who already has the necessary permissions to manage access to the file. This ensures that the correct permissions are set and that the file is securely shared with the intended recipients.

Additional reference: List permissions

Hope this helps.

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