(Unicode C++) GeoOp Exchange Refresh Token for New Access Token

Demonstrates how to use the /oauth2/token endpoint to exchange it for a new access token once the current access token has expired.

Note: This example requires Chilkat v9.5.0.65 or greater.

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

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

    // This example also assumes that OAuth2 access and refresh tokens were previously fetched.
    // and saved in a JSON file.  

    // First get our previously obtained refresh token.
    // { .... "refresh_token":"e6dqdG....mzjpT04w==", .... }
    CkJsonObjectW jsonToken;
    bool success = jsonToken.LoadFile(L"qa_data/tokens/geoop.json");

    CkRestW rest;

    // Connect to GeoOp...
    bool bAutoReconnect = true;
    success = rest.Connect(L"login.geoop.com",443,true,bAutoReconnect);
    if (success != true) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // Set the X-Version header.
    rest.AddHeader(L"X-Version",L"1.0");

    // Provide the required form params to get the new access token
    wprintf(L"refresh_token = %s\n",jsonToken.stringOf(L"refresh_token"));
    rest.AddQueryParam(L"refresh_token",jsonToken.stringOf(L"refresh_token"));
    rest.AddQueryParam(L"grant_type",L"refresh_token");
    rest.AddQueryParam(L"client_id",L"GEOOP-CLIENT-ID");
    rest.AddQueryParam(L"client_secret",L"GEOOP-CLIENT-SECRET");

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

    // If the response status code did not indicate success, then see what happened..
    if (rest.get_ResponseStatusCode() != 200) {
        wprintf(L"Request Header: \n");
        wprintf(L"%s\n",rest.lastRequestHeader());
        wprintf(L"----\n");
        wprintf(L"Response StatusCode = %d\n",rest.get_ResponseStatusCode());
        wprintf(L"Response StatusLine: %s\n",rest.responseStatusText());
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",rest.responseHeader());
        wprintf(L"%s\n",responseBody);
        return;
    }

    CkJsonObjectW json;
    json.put_EmitCompact(false);
    json.Load(responseBody);

    // Show the full JSON response.  It should contain the new access token...
    wprintf(L"%s\n",json.emit());
    }