OneDrive API技术问询：如何批量获取文件/文件夹的共享对象？

Great question—having to hit the /drive/items/{fileId}/permissions endpoint for every single shared item is definitely inefficient when dealing with large volumes. Luckily, there's a more streamlined way to get this data in bulk using Microsoft Graph's expansion capabilities.

Use $expand=permissions in List Requests #

The key here is to append the $expand=permissions query parameter to your existing list endpoints (sharedWithMe or root/children). This tells Graph to include the full permissions dataset for each item directly in the response, eliminating the need for individual calls per file/folder.

Example Requests #

• For items shared with you:

  GET https://graph.microsoft.com/v1.0/me/drive/sharedWithMe?$expand=permissions
  

• For items in your root directory:

  GET https://graph.microsoft.com/v1.0/me/drive/root/children?$expand=permissions
  

Each item in the response will now include a permissions array, which contains details about every user/entity the item is shared with—including their email address, permission type (e.g., read, write), and unique ID.

Important Notes & Limitations #

• Pagination: Graph limits the number of items returned per request (default is 200, max is 999). Use the $top parameter to adjust this, and handle pagination tokens (@odata.nextLink) to fetch all items in batches.
• Direct vs. Inherited Permissions: The permissions array only returns directly assigned permissions by default. If you need to include inherited permissions, use the $expand=permissions($expand=inheritedFrom) syntax, but keep in mind this can increase response size and latency.
• Performance Considerations: If you're dealing with thousands of items or items with hundreds of permissions, break your requests into smaller batches to avoid timeouts or throttling. You can also use $select to only fetch the fields you need (e.g., $select=id,name,permissions) to reduce payload size.
• Throttling: Microsoft Graph enforces throttling limits, so requests with expansion count as a single call towards your quota—way more efficient than hundreds of individual permissions queries.

Alternative: Batch Requests (If Expansion Isn't Sufficient) #

If the $expand approach doesn't meet your needs (e.g., you need very granular control over permissions data), you can use Graph's batch request feature. This lets you send up to 20 individual permissions queries in a single HTTP request, which is still far better than making 20 separate calls.

For example, a batch request body would look like this:

{
  "requests": [
    {
      "id": "1",
      "method": "GET",
      "url": "/me/drive/items/{fileId1}/permissions"
    },
    {
      "id": "2",
      "method": "GET",
      "url": "/me/drive/items/{fileId2}/permissions"
    }
  ]
}

Final Recommendation #

Start with the $expand=permissions approach—it's the simplest and most efficient way to get bulk permission data for your OneDrive items. Only fall back to batch requests if you have specific requirements that expansion can't handle.

内容的提问来源于stack exchange，提问作者AlexL