(C) Rabobank Refresh OAuth2 Access Token

Demonstrates how to refresh an expired Rabobank OAuth2 access token. (No interactive user interaction is required to refresh an access token.)

Note: This example requires Chilkat v11.0.0 or greater.

For more information, see https://developer.rabobank.nl/implementoauth2

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#include <C_CkJsonObject.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttp.h>
#include <C_CkHttpResponse.h>
#include <C_CkFileAccess.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObject json;
    HCkHttpRequest req;
    HCkHttp http;
    HCkHttpResponse resp;
    HCkFileAccess fac;

    success = FALSE;

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

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

    json = CkJsonObject_Create();
    success = CkJsonObject_LoadFile(json,"qa_data/tokens/rabobank.json");
    if (success != TRUE) {
        CkJsonObject_Dispose(json);
        return;
    }

    // {
    //   "token_type": "Bearer",
    //   "access_token": "AAIkYTU0ZWM ... sxE0KL0HHWw",
    //   "expires_in": 3600,
    //   "consented_on": 1584641121,
    //   "scope": "ais.balances.read ais.transactions.read-90days ais.transactions.read-history",
    //   "refresh_token": "AAJXXSdN ... Uiblz9ILkxNBlytRGA",
    //   "refresh_token_expires_in": 157784760,
    //   "expires_on": "1584644722"
    // }

    // Refresh the access token by sending a POST like this:
    // 

    // POST /oauth2/token
    // Headers:
    //     Content-Type: application/x-www-form-urlencoded
    //     Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)
    // 
    // Body (x-www-form-urlencoded):
    //     grant_type: refresh_token
    //     refresh_token: REFRESH_TOKEN

    req = CkHttpRequest_Create();
    CkHttpRequest_AddParam(req,"grant_type","refresh_token");
    CkHttpRequest_AddParam(req,"refresh_token",CkJsonObject_stringOf(json,"refresh_token"));

    http = CkHttp_Create();

    // Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
    CkHttp_putBasicAuth(http,TRUE);
    CkHttp_putLogin(http,"YOUR_APP_CLIENT_ID");
    CkHttp_putPassword(http,"YOUR_APP_CLIENT_SECRET");

    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putContentType(req,"application/x-www-form-urlencoded");

    resp = CkHttpResponse_Create();
    success = CkHttp_HttpReq(http,"https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token",req,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkJsonObject_Dispose(json);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        CkHttpResponse_Dispose(resp);
        return;
    }

    // Load the JSON response.
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));
    CkJsonObject_putEmitCompact(json,FALSE);

    // Show the JSON response.
    printf("%s\n",CkJsonObject_emit(json));

    printf("Response status code: %d\n",CkHttpResponse_getStatusCode(resp));

    // If the response status code is not 200, then it's an error.
    if (CkHttpResponse_getStatusCode(resp) != 200) {
        CkJsonObject_Dispose(json);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        CkHttpResponse_Dispose(resp);
        return;
    }

    // Save the refreshed access token JSON to a file for future requests.
    fac = CkFileAccess_Create();
    CkFileAccess_WriteEntireTextFile(fac,"qa_data/tokens/rabobank.json",CkJsonObject_emit(json),"utf-8",FALSE);


    CkJsonObject_Dispose(json);
    CkHttpRequest_Dispose(req);
    CkHttp_Dispose(http);
    CkHttpResponse_Dispose(resp);
    CkFileAccess_Dispose(fac);

    }