(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 <C_CkHttpW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkHttpW http;
    HCkJsonObjectW jsonOAuthCC;
    HCkStringBuilderW sbJson;
    int statusCode;
    HCkJsonObjectW jsonResp;

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

    http = CkHttpW_Create();

    // 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.  
    jsonOAuthCC = CkJsonObjectW_Create();

    // --------------------------------------------------------------------------------------------------------
    // 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.
    CkJsonObjectW_UpdateString(jsonOAuthCC,L"client_id",L"e1cd2318-xxxx-4916-bfd6-xxxxxxxxxxxx");
    CkJsonObjectW_UpdateString(jsonOAuthCC,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.
    CkJsonObjectW_UpdateString(jsonOAuthCC,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).
    CkJsonObjectW_UpdateString(jsonOAuthCC,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,
    CkHttpW_putAuthToken(http,CkJsonObjectW_emit(jsonOAuthCC));

    // Get information about all SharePoint sites.
    sbJson = CkStringBuilderW_Create();
    success = CkHttpW_QuickGetSb(http,L"https://graph.microsoft.com/v1.0/sites/getAllSites",sbJson);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        CkJsonObjectW_Dispose(jsonOAuthCC);
        CkStringBuilderW_Dispose(sbJson);
        return;
    }

    statusCode = CkHttpW_getLastStatus(http);

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

    if (statusCode != 200) {
        wprintf(L"%s\n",CkStringBuilderW_getAsString(sbJson));
        wprintf(L"Failed.\n");
        CkHttpW_Dispose(http);
        CkJsonObjectW_Dispose(jsonOAuthCC);
        CkStringBuilderW_Dispose(sbJson);
        return;
    }

    jsonResp = CkJsonObjectW_Create();
    CkJsonObjectW_LoadSb(jsonResp,sbJson);
    CkJsonObjectW_putEmitCompact(jsonResp,FALSE);

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


    CkHttpW_Dispose(http);
    CkJsonObjectW_Dispose(jsonOAuthCC);
    CkStringBuilderW_Dispose(sbJson);
    CkJsonObjectW_Dispose(jsonResp);

    }