(Unicode C++) Calendar: Refresh Expired OAuth2 Access Token

Refreshes an expired OAuth2 access token.

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#include <CkJsonObjectW.h>
#include <CkHttpRequestW.h>
#include <CkHttpW.h>
#include <CkHttpResponseW.h>
#include <CkFileAccessW.h>

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

    CkJsonObjectW json;
    bool success = json.LoadFile(L"qa_data/tokens/msGraphCalendar.json");
    if (success != true) {
        return;
    }

    CkHttpRequestW req;
    req.AddParam(L"grant_type",L"refresh_token");
    req.AddParam(L"redirect_uri",L"http://localhost:3017/");
    req.AddParam(L"client_id",L"MICROSOFT-GRAPH-CLIENT-ID");
    req.AddParam(L"client_secret",L"MICROSOFT-GRAPH-CLIENT-SECRET");
    req.AddParam(L"refresh_token",json.stringOf(L"refresh_token"));
    req.AddParam(L"scope",L"openid profile offline_access user.readwrite calendars.readwrite files.readwrite");

    CkHttpW http;

    CkHttpResponseW *resp = http.PostUrlEncoded(L"https://login.microsoftonline.com/common/oauth2/v2.0/token",req);
    if (http.get_LastMethodSuccess() != true) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    // Load the JSON response.
    json.Load(resp->bodyStr());
    json.put_EmitCompact(false);

    // Show the JSON response.
    wprintf(L"%s\n",json.emit());

    wprintf(L"Response status code: %d\n",resp->get_StatusCode());

    // If the response status code is not 200, then it's an error.
    if (resp->get_StatusCode() != 200) {
        return;
    }

    delete resp;

    // Save the refreshed access token JSON to a file for future requests.
    CkFileAccessW fac;
    fac.WriteEntireTextFile(L"qa_data/tokens/msGraphCalendar.json",json.emit(),L"utf-8",false);

    wprintf(L"Success.\n");
    }