Graph API to read contents of a site shared with me by third party SharePoint

Question

Scenario:

I created an app in Azure with permissions:

• Sites.Read.All (Delegated)
• User.Read (Delegated)
• Sites.Read.All (Application)

I'm able to follow the authorization flow and get an access and refresh token. This is the authorization URL:

https://login.microsoftonline.com/common/oauth2/v2.0/authorize?client_id={clientId}&scope=files.readwrite offline_access&response_type=code&redirect_uri={myCallbackURL}

I'm able to use the access token to get a list of my drives (I'm using js):

axios({
  method: 'GET',
  url: 'https://graph.microsoft.com/v1.0/me/drives',
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
    'Authorization': `Bearer ${tokens.access_token}`
  }
})

Everything is ok. I also can retrieve list of files in the drive.

Now the question:

A company wants me to read the contents of a SharePoint site they shared with me.

From browser's perspective I only have access to site mysite of mycompany's SharePoint : https://mycompany.sharepoint.com/sites/mysite/

I have no access to company root: https://mycompany.sharepoint.com takes me to a request permissions screen. That's the expected.

I need to read the contents of mysite from GraphAPI, but after two days reading the docs I couldn't manage to get it working:

Attempts:

GET https://graph.microsoft.com/v1.0/me/sites
GET https://graph.microsoft.com/v1.0/sites/mycompany.sharepoint.com
GET https://graph.microsoft.com/v1.0/sites/mycompany.sharepoint.com:/mysite
GET https://graph.microsoft.com/v1.0/sites?$filter=siteCollection/hostname eq 'mycompany.sharepoint.com'

I also tried to change the scope scope=Sites.Read.All to authorize URL (doesn't work, sites.read.all is a permission, not a scope, but I was running out of ideas)

Is it possible to read the contents of mysite from Graph API? Do I have to use a different authorization URL specifically for mycompany.sharepoint.com?

My intuition is, given I have permissions to read the contents from my browser, it should exist a way to do the same via API. But I'm not sure.

Answer 1

Hello @Admibox ,

To get a specific site from SharePoint using Microsoft Graph use the following Graph API:

GET /sites/mycompany.sharepoint.com:/sites/mysite

References:

Access a site by server relative URL

Hope this helps.

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