(Unicode C++) SharePoint OAuth2 Client Credentials Authentication

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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.)

Note: This example uses the new "Integrated OAuth2 Client Credentials" feature introduced in Chilkat v9.5.0.96.

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#include <CkHttpW.h>
#include <CkJsonObjectW.h>
#include <CkStringBuilderW.h>

void ChilkatSample(void)
    {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    bool success;
    CkHttpW http;

    // Provide the information needed for Chilkat to automatically fetch the OAuth2.0 
    // access token as needed.
    // This is the new "Integrated OAuth2 Client Credentials" feature introduced in Chilkat v9.5.0.96.  
    CkJsonObjectW jsonOAuthCC;

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

    // Use the values from your App Registration in Azure.
    jsonOAuthCC.UpdateString(L"client_id",L"e1cd2318-xxxx-4916-bfd6-xxxxxxxxxxxx");
    jsonOAuthCC.UpdateString(L"client_secret",L"K.d8Q~RoJxxxxvCj_u_xxxxxxxxxxxxxxxxxxxxx");

    // 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(L"scope",L"https://graph.microsoft.com/.default");

    // The token endpoint includes your tenant ID.  Use your tenant ID (not the tenant ID shown here).
    jsonOAuthCC.UpdateString(L"token_endpoint",L"https://login.microsoftonline.com/112d7ed6-71bf-4eba-a866-738364321bfc/oauth2/v2.0/token");

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

    // Get information about all SharePoint sites.
    CkStringBuilderW sbJson;
    success = http.QuickGetSb(L"https://graph.microsoft.com/v1.0/sites/getAllSites",sbJson);
    if (success == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    int statusCode = http.get_LastStatus();

    wprintf(L"Response status code = %d\n",statusCode);

    if (statusCode != 200) {
        wprintf(L"%s\n",sbJson.getAsString());
        wprintf(L"Failed.\n");
        return;
    }

    CkJsonObjectW jsonResp;
    jsonResp.LoadSb(sbJson);
    jsonResp.put_EmitCompact(false);

    wprintf(L"%s\n",jsonResp.emit());
    wprintf(L"Success.\n");
    }