(Unicode C++) Azure REST API Access Token

Demonstrates how to request an Azure REST API OAUTH2 access token.

Note: In order to access resources a Service Principal needs to be created in your Tenant. It is really convenient to do it via AZ CLI:

az ad sp create-for-rbac --name [APP_NAME] --password [CLIENT_SECRET]

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#include <CkRestW.h>
#include <CkJsonObjectW.h>

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

    CkRestW rest;

    // URL: https://login.microsoftonline.com/TENANT_ID/oauth2/token
    bool bTls = true;
    int port = 443;
    bool bAutoReconnect = true;
    bool success = rest.Connect(L"login.microsoftonline.com",port,bTls,bAutoReconnect);
    if (success != true) {
        wprintf(L"ConnectFailReason: %d\n",rest.get_ConnectFailReason());
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // Add query params to the request.
    rest.AddQueryParam(L"grant_type",L"client_credentials");
    rest.AddQueryParam(L"client_id",L"APP_ID");
    rest.AddQueryParam(L"client_secret",L"CLIENT_SECRET");
    rest.AddQueryParam(L"resource",L"https://management.azure.com/");

    const wchar_t *strResponseBody = rest.fullRequestFormUrlEncoded(L"POST",L"/TENANT_ID/oauth2/token");
    if (rest.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    int respStatusCode = rest.get_ResponseStatusCode();
    if (respStatusCode >= 400) {
        wprintf(L"Response Status Code = %d\n",respStatusCode);
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",rest.responseHeader());
        wprintf(L"Response Body:\n");
        wprintf(L"%s\n",strResponseBody);
        return;
    }

    CkJsonObjectW json;
    json.Load(strResponseBody);
    json.put_EmitCompact(false);
    wprintf(L"%s\n",json.emit());

    // The result is an access token such as the following:

    // {
    //   "token_type": "Bearer",
    //   "expires_in": "3600",
    //   "ext_expires_in": "3600",
    //   "expires_on": "1557864616",
    //   "not_before": "1557860716",
    //   "resource": "https://management.azure.com/",
    //   "access_token": "eyJ0eXAiOiJKV1QiL ... 20UFDDOHEyUg"
    // }

    // We'll save this JSON to a file for other examples to use..
    json.WriteFile(L"qa_data/tokens/azureToken.json");
    }