(Unicode C) Refresh Expiring OAuth2 Access Token for Azure Registered App

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#include <C_CkJsonObjectW.h>
#include <C_CkDateTimeW.h>
#include <C_CkOAuth2W.h>
#include <C_CkFileAccessW.h>

void ChilkatSample(void)
    {
    HCkJsonObjectW json;
    BOOL success;
    HCkDateTimeW dtExpire;
    HCkOAuth2W oauth2;
    HCkFileAccessW fac;

    // We previously obtained an access token and saved the JSON to a file using this example:
    // Get OAuth2 Access Token for Azure Registered App

    // This example will examine the JSON and expiration date, and if near expiration will
    // refresh the access token.

    json = CkJsonObjectW_Create();
    success = CkJsonObjectW_LoadFile(json,L"qa_data/tokens/_myAzureApp.json");
    if (success != TRUE) {
        wprintf(L"Failed to load the access token.\n");
        CkJsonObjectW_Dispose(json);
        return;
    }

    // The contents of the JSON look like this:
    // {
    //   "token_type": "Bearer",
    //   "scope": "User.Read Mail.ReadWrite Mail.Send",
    //   "expires_in": 3600,
    //   "ext_expires_in": 0,
    //   "access_token": "EwBAA8l6B...",
    //   "refresh_token": "MCRMdbe6Cd...",
    //   "id_token": "eyJ0eXAiOiJ...",
    //   "expires_on": "1494112119"
    // }

    // The "expires_on" value is a Unix time.
    dtExpire = CkDateTimeW_Create();
    CkDateTimeW_SetFromUnixTime(dtExpire,FALSE,CkJsonObjectW_IntOf(json,L"expires_on"));

    // If this date/time expires within 10 minutes of the current system time, refresh the token.
    if (CkDateTimeW_ExpiresWithin(dtExpire,10,L"minutes") != TRUE) {
        wprintf(L"No need to refresh, the access token won't expire within the next 10 minutes.\n");
        CkJsonObjectW_Dispose(json);
        CkDateTimeW_Dispose(dtExpire);
        return;
    }

    // OK, we need to refresh the access token..
    oauth2 = CkOAuth2W_Create();

    // Note: The endpoint depends on the Azure App Registration.
    // See How to Choose the Correct Endpoints for your Azure App Registration
    CkOAuth2W_putTokenEndpoint(oauth2,L"https://login.microsoftonline.com/common/oauth2/v2.0/token");

    // Use your client ID.
    CkOAuth2W_putClientId(oauth2,L"CLIENT_ID");

    // Get the existing refresh token.
    CkOAuth2W_putRefreshToken(oauth2,CkJsonObjectW_stringOf(json,L"refresh_token"));

    // Send the HTTP POST to refresh the access token.
    success = CkOAuth2W_RefreshAccessToken(oauth2);
    if (success == FALSE) {
        wprintf(L"%s\n",CkOAuth2W_lastErrorText(oauth2));
        CkJsonObjectW_Dispose(json);
        CkDateTimeW_Dispose(dtExpire);
        CkOAuth2W_Dispose(oauth2);
        return;
    }

    wprintf(L"OAuth2 authorization granted!\n");
    wprintf(L"Access Token = %s\n",CkOAuth2W_accessToken(oauth2));

    // Get the full JSON response:
    CkJsonObjectW_Load(json,CkOAuth2W_accessTokenResponse(oauth2));
    CkJsonObjectW_putEmitCompact(json,FALSE);

    // If an "expires_on" member does not exist, then add the JSON member by
    // getting the current system date/time and adding the "expires_in" seconds.
    // This way we'll know when the token expires.
    if (CkJsonObjectW_HasMember(json,L"expires_on") != TRUE) {
        CkDateTimeW_SetFromCurrentSystemTime(dtExpire);
        CkDateTimeW_AddSeconds(dtExpire,CkJsonObjectW_IntOf(json,L"expires_in"));
        CkJsonObjectW_AppendString(json,L"expires_on",CkDateTimeW_getAsUnixTimeStr(dtExpire,FALSE));
    }

    wprintf(L"%s\n",CkJsonObjectW_emit(json));

    // Save the new access token JSON to a file for future requests.
    fac = CkFileAccessW_Create();
    CkFileAccessW_WriteEntireTextFile(fac,L"qa_data/tokens/_myAzureApp.json",CkJsonObjectW_emit(json),L"utf-8",FALSE);


    CkJsonObjectW_Dispose(json);
    CkDateTimeW_Dispose(dtExpire);
    CkOAuth2W_Dispose(oauth2);
    CkFileAccessW_Dispose(fac);

    }