Issues Implementing Advanced Features with Microsoft Graph SDK 2.0 for SharePoint

Hello everyone,

I am working on a project that uses version 2.0 of the Microsoft Graph SDK library to interact with SharePoint. I have successfully set up the following permissions in Azure AD:

Files.ReadWrite.All
BrowserSiteLists.ReadWrite.All
Sites.FullControl.All
And I have developed a class, GraphTest, to handle authentication and some basic operations. My current code works for obtaining a SharePoint site ID via URL (certainly not the best method), but I am encountering difficulties in implementing more advanced features, specifically:

1. Use the "Get a site resource" method with hostname and relative-path (GET /sites/{hostname}:/{server-relative-path}).
2. Create a new folder in SharePoint by specifying a destination URL and the folder name (POST /sites/{site-id}/drive/items/{parent-item-id}/children).
3. Upload a new small file to SharePoint by providing a destination URL and the file (PUT /sites/{site-id}/drive/items/{parent-id}:/{filename}:/content).
4. Upload a large file to SharePoint by creating an upload session (POST /sites/{siteId}/drive/items/{itemId}/createUploadSession).

I am a bit confused by the documentation and the examples provided, and would be very grateful if someone could provide me with some code examples or advice on how to implement these features. I am sure that other members of the community could also benefit from this discussion.

Thank you in advance for your time and help.

Best regards,
Ivan

Here is my code:

// Define the SharePoint site URL
$url = 'https://contoso.sharepoint.com/sites/examplesite';

// Define authentication settings including client ID, client secret, and tenant ID
$settings = array(
'clientId' => 'xxxxxxxxxxxxxxxxxxxx',
'clientSecret' => 'xxxxxxxxxxxxxxxxxxxx',
'tenantId' => 'xxxxxxxxxxxxxxxxxxxx'
);

// Create an instance of the GraphTest class and initialize it with the authentication settings
$graphServiceClient = new GraphTest($settings);

// Call the getSiteId method of the GraphTest instance to obtain the SharePoint site ID based on the URL
$resultID = $graphServiceClient->getSiteId($url);

class GraphTest
{
private $graphServiceClient;
private $tenantId;
private $clientId;
private $clientSecret;

/**
 * Constructor to initialize class properties.
 *
 * @param array $settings Configuration settings including tenantId, clientId, and clientSecret.
 */
public function __construct(array $settings)
{
    $this->tenantId = $settings['tenantId'];
    $this->clientId = $settings['clientId'];
    $this->clientSecret = $settings['clientSecret'];
    $this->authenticate();
}

/**
 * Authenticates and sets up the Graph Service Client.
 */
private function authenticate()
{
    $tokenRequestContext = new ClientCredentialContext($this->tenantId, $this->clientId, $this->clientSecret);
    $this->graphServiceClient = new GraphServiceClient($tokenRequestContext);
}

/**
 * Retrieves the site ID based on a given SharePoint path.
 *
 * @param string $sharePointPath The SharePoint URL.
 * @return string|null The site ID or null if not found.
 */
public function getSiteId($sharePointPath)
{
    try {
        $siteName = basename(parse_url($sharePointPath, PHP_URL_PATH));
        $request = $this->graphServiceClient->sites()->get()->wait();

        foreach ($request->getValue() as $site) {
            if ($site->getName() === $siteName) {
                return $site->getId();
            }
        }
        return null;
    } catch (ApiException $ex) {
        // Log the error and rethrow or handle it as needed
        error_log("API Error: " . $ex->getMessage());
        throw $ex;
    } catch (\Exception $e) {
        // Log general exceptions and rethrow or handle them as needed
        error_log("General Error: " . $e->getMessage());
        throw $e;
    }
}

}