(Unicode C++) RSAP Union API - Get OAuth2 Access Token

Demonstrates how to get an OAuth2 access token for the RSAP Union API. Note: This uses the client credentials flow, which does NOT require an interactive engagement using a browser.

For more information, see https://app.swaggerhub.com/apis-docs/pderas/RSAP/2.0.1#/Authentication/getOauthToken

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#include <CkHttpW.h>
#include <CkJsonObjectW.h>
#include <CkCertW.h>
#include <CkPrivateKeyW.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;
    bool success;

    // The following JSON is sent in the request body.

    // {
    //   "grant_type": "client_credentials",
    //   "client_id": 1234,
    //   "client_secret": "23456abcde"
    // }

    CkJsonObjectW json;
    json.UpdateString(L"grant_type",L"client_credentials");
    json.UpdateInt(L"client_id",1234);
    json.UpdateString(L"client_secret",L"23456abcde");

    http.SetRequestHeader(L"Content-type",L"application/json");

    // Add the client certificate TLS authentication.
    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/certs_and_keys/union_client_certificate.crt");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkPrivateKeyW privKey;
    success = privKey.LoadAnyFormatFile(L"qa_data/certs_and_keys/union_client_certificate.nopass.key",L"");
    if (success == false) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    // Associate the private key with the cert.
    // This will fail if the private key is not actually the correct one that corresponds to the public key stored within the cert.
    success = cert.SetPrivateKey(privKey);
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Tell HTTP to use the cert for client TLS certificate authentication.
    success = http.SetSslClientCert(cert);
    if (success == false) {
        wprintf(L"%s\n",http.lastErrorText());
        return;
    }

    CkHttpResponseW *resp = http.PostJson3(L"https://api-test.rsap.ca/oauth/token",L"application/json",json);
    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)

    // {
    //   "token_type": "Bearer",
    //   "expires_in": 3600,
    //   "access_token": "eyJ0eXAi...LnE"
    // }

    // This token expires in 1 hour.  Your application could re-use the same token for up to an hour,
    // or it can simply get a new access token before each request (if you're not doing too many requests).
    success = jResp.WriteFile(L"qa_data/tokens/rsapToken.json");
    }