(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 <C_CkRest.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkRest rest;
    BOOL bTls;
    int port;
    BOOL bAutoReconnect;
    BOOL success;
    const char *strResponseBody;
    int respStatusCode;
    HCkJsonObject json;

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

    rest = CkRest_Create();

    // URL: https://login.microsoftonline.com/TENANT_ID/oauth2/token
    bTls = TRUE;
    port = 443;
    bAutoReconnect = TRUE;
    success = CkRest_Connect(rest,"login.microsoftonline.com",port,bTls,bAutoReconnect);
    if (success != TRUE) {
        printf("ConnectFailReason: %d\n",CkRest_getConnectFailReason(rest));
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

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

    strResponseBody = CkRest_fullRequestFormUrlEncoded(rest,"POST","/TENANT_ID/oauth2/token");
    if (CkRest_getLastMethodSuccess(rest) != TRUE) {
        printf("%s\n",CkRest_lastErrorText(rest));
        CkRest_Dispose(rest);
        return;
    }

    respStatusCode = CkRest_getResponseStatusCode(rest);
    if (respStatusCode >= 400) {
        printf("Response Status Code = %d\n",respStatusCode);
        printf("Response Header:\n");
        printf("%s\n",CkRest_responseHeader(rest));
        printf("Response Body:\n");
        printf("%s\n",strResponseBody);
        CkRest_Dispose(rest);
        return;
    }

    json = CkJsonObject_Create();
    CkJsonObject_Load(json,strResponseBody);
    CkJsonObject_putEmitCompact(json,FALSE);
    printf("%s\n",CkJsonObject_emit(json));

    // 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..
    CkJsonObject_WriteFile(json,"qa_data/tokens/azureToken.json");


    CkRest_Dispose(rest);
    CkJsonObject_Dispose(json);

    }