(Unicode C++) Isabel Connect Create Access Token given Valid Refresh Token

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Create (refresh) an access token given a valid refresh token.

For more information, see https://documentation.ibanity.com/isabel-connect/api#create-access-token

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#include <CkHttpW.h>
#include <CkCertW.h>
#include <CkHttpRequestW.h>
#include <CkJsonObjectW.h>
#include <CkCrypt2W.h>
#include <CkHttpResponseW.h>
#include <CkStringBuilderW.h>

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

    CkHttpW http;

    // Implements the following CURL command:

    // curl -X POST https://api.ibanity.com/isabel-connect/oauth2/token \
    // --cert certificate.pem:qwertyuiop1 \
    // --key private_key.pem  \
    // -H "Content-Type: application/x-www-form-urlencoded" \
    // -H "Accept: application/vnd.api+json" \
    // -H "Ibanity-Idempotency-Key: 94c5586e-e15e-4bae-a1fe-fdbefe1f11d3"  \
    // -d grant_type=refresh_token \
    // -d refresh_token=valid_refresh_token \
    // -d client_id=valid_client_id \
    // -d client_secret=valid_client_secret

    // Ibanity provides the certificate + private key in PFX format.  This example will use the .pfx instead of the pair of PEM files.
    // (It is also possible to implement using Chilkat with the PEM files, but PFX is easier.)
    CkCertW cert;
    bool success = cert.LoadPfxFile(L"qa_data/pfx/my_ibanity_certificate.pfx",L"my_pfx_password");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    success = http.SetSslClientCert(cert);
    if (success == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    CkHttpRequestW req;
    req.put_HttpVerb(L"POST");
    req.put_Path(L"/isabel-connect/oauth2/token");
    req.put_ContentType(L"application/x-www-form-urlencoded");
    req.AddParam(L"grant_type",L"refresh_token");

    // Load the previously obtained refresh token.
    CkJsonObjectW jsonToken;
    success = jsonToken.LoadFile(L"qa_data/tokens/isabel_refresh_token.json");
    if (success == false) {
        wprintf(L"No existing access token.\n");
        return;
    }

    req.AddParam(L"refresh_token",jsonToken.stringOf(L"refresh_token"));

    // Note: For sandbox testing, we literally want to use the strings
    // "valid_client_id", and "valid_client_secret".
    // For the live app, you would replace these with actual values.
    req.AddParam(L"client_id",L"valid_client_id");
    req.AddParam(L"client_secret",L"valid_client_secret");

    req.AddHeader(L"Accept",L"application/vnd.api+json");

    CkCrypt2W crypt;
    const wchar_t *idempotencyKey = crypt.generateUuid();
    wprintf(L"Ibanity-Idempotency-Key: %s\n",idempotencyKey);
    req.AddHeader(L"Ibanity-Idempotency-Key",idempotencyKey);

    CkHttpResponseW *resp = http.PostUrlEncoded(L"https://api.ibanity.com/isabel-connect/oauth2/token",req);
    if (http.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    CkStringBuilderW sbResponseBody;
    resp->GetBodySb(sbResponseBody);
    CkJsonObjectW jResp;
    jResp.LoadSb(sbResponseBody);
    jResp.put_EmitCompact(false);

    wprintf(L"Response Body:\n");
    wprintf(L"%s\n",jResp.emit());

    int respStatusCode = resp->get_StatusCode();
    wprintf(L"Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        wprintf(L"Response Header:\n");
        wprintf(L"%s\n",resp->header());
        wprintf(L"Failed.\n");
        delete resp;
        return;
    }

    delete resp;

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // Notice that we don't get a new refresh token.  The original refresh token is used each time we
    // want to refresh.  However, we get a new access token.  This access token is to be used in Isabel API calls
    // until we need to refresh again.
    // {
    //   "token_type": "Bearer",
    //   "scope": "cloudconnect",
    //   "expires_in": 1799,
    //   "access_token": "access_token_1603365408"
    // }

    // Sample code for parsing the JSON response...
    // Use the following online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    const wchar_t *token_type = jResp.stringOf(L"token_type");
    const wchar_t *scope = jResp.stringOf(L"scope");
    int expires_in = jResp.IntOf(L"expires_in");
    const wchar_t *access_token = jResp.stringOf(L"access_token");

    // Save this to a file so we can load in other examples to include the access token in the HTTP request.
    success = jResp.WriteFile(L"qa_data/tokens/isabel_access_token.json");
    }