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

Refreshes an expired OAuth2 access token.

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#include <CkJsonObject.h>
#include <CkHttpRequest.h>
#include <CkHttp.h>
#include <CkHttpResponse.h>
#include <CkFileAccess.h>

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

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

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

    CkHttp http;

    CkHttpResponse *resp = http.PostUrlEncoded("https://login.microsoftonline.com/common/oauth2/v2.0/token",req);
    if (http.get_LastMethodSuccess() != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

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

    // Show the JSON response.
    std::cout << json.emit() << "\r\n";

    std::cout << "Response status code: " << resp->get_StatusCode() << "\r\n";

    // 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.
    CkFileAccess fac;
    fac.WriteEntireTextFile("qa_data/tokens/msGraphCalendar.json",json.emit(),"utf-8",false);

    std::cout << "Success." << "\r\n";
    }