Microsoft Graph API - OneDrive Webhook Subscription - Missing resourceData

Question

Hi there,

What I would like to accomplish:
Create a webhook subscription to get notified when a new file was added to OneDrive.
Send the URL of this file to another system.

I was able to create the webhook subscription:
POST v1.0 https://graph.microsoft.com/v1.0/subscriptions/
{
"changeType": "created",
"notificationUrl": "https://mycompany.com/endpoint",
"resource": "me/drives/b!1lVEG878979798797rY6lE6MlpN1VmjlrtoAcTJIODFA4xdEn/root",
"expirationDateTime": "2022-09-13T00:00:00Z"
}

Based on the documentation OneDrive only supports the "updated" changeType. Source

When I then create a new file on OneDrive I get the following POST body:
{
"value": [
{
"subscriptionId": "94d39be7-ba1a-4d2a-b83e-bfc3b1c746ca",
"clientState": null,
"resource": "me/drives/b!1lVEG878979798797rY6lE6MlpN1VmjlrtoAcTJIODFA4xdEn/root",
"tenantId": "f81434a7-5648-4ba6-a67f-83a42e7b1f0d",
"resourceData": null,
"subscriptionExpirationDateTime": "2022-09-13T00:00:00+00:00",
"changeType": "updated"
}
]
}

As you can see, the resourceData property is null.
How can I receive this information?
I would like to know the ID of the changed file (in my case the newly created file), fetch metadata of this file and send it to another system.

Thank you in advance.

Answer 1

Hi @JO-5324
Not all resources return resourceData within the notification itself, OneDrive is one of these.
OneDrive will return the following properties:

{  
  "subscriptionId": "string",  
  "expirationDateTime": "datetime",  
  "resource": "relative url",  
  "clientState": "string optional",  
  "changeType": "updated"  
}  

You can find the spesific documentation for this entity here.

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Answer 2

Hi @JO-5324 ,

As per documentation drive subscriptions, in the subscription create request it is important to use the "changeType": "updated" as it is the only supported type for the drive resource.

For drive subscriptions resourceData: null, you will need to use the delta functionality ( /drive/root/delta ) on the target drive’s root object to track state and find what changed.

Refer to devblog: onedrive-webhooks-with-microsoft-graph.

Hope this helps.
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