C#

SharePoint OAuth2 Client Credentials Authentication

Demonstrates how to authenticate with OAuth 2.0 using the client credentials grant type. This is for SharePoint Online which is the cloud-based service provided by Microsoft as part of Office 365. (Users access SharePoint Online through a web browser, and the service is hosted on Microsoft's servers.) C#

bool success = false;

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Http http = new Chilkat.Http();

// Provide the information needed for Chilkat to automatically fetch the OAuth2.0 
// access token as needed.
Chilkat.JsonObject jsonOAuthCC = new Chilkat.JsonObject();

// --------------------------------------------------------------------------------------------------------
// You'll need to have registered an app in Azure beforehand.
// See How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
// --------------------------------------------------------------------------------------------------------

// Use the values from your App Registration in Azure.
jsonOAuthCC.UpdateString("client_id","CLIENT_ID");
jsonOAuthCC.UpdateString("client_secret","SECRET_VALUE");

// You'll always use this scope for client credentials, because the allowed actions
// are determined by the App Permissions defined when you registered the app in Azure.
jsonOAuthCC.UpdateString("scope","https://graph.microsoft.com/.default");

// The token endpoint includes your tenant ID. 
jsonOAuthCC.UpdateString("token_endpoint","https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token");

// Provide the OAuth2 information. Chilkat will use this information to automatically fetch the OAuth2 access token as needed,
http.AuthToken = jsonOAuthCC.Emit();

// Get information about all SharePoint sites.
Chilkat.StringBuilder sbJson = new Chilkat.StringBuilder();
success = http.QuickGetSb("https://graph.microsoft.com/v1.0/sites/getAllSites",sbJson);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

int statusCode = http.LastStatus;

Debug.WriteLine("Response status code = " + Convert.ToString(statusCode));

if (statusCode != 200) {
    Debug.WriteLine(sbJson.GetAsString());
    Debug.WriteLine("Failed.");
    return;
}

Chilkat.JsonObject jsonResp = new Chilkat.JsonObject();
jsonResp.LoadSb(sbJson);
jsonResp.EmitCompact = false;

Debug.WriteLine(jsonResp.Emit());
Debug.WriteLine("Success.");

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON