(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.)

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

    // 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");

    resp = CkHttp_PostUrlEncoded(http,"https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token",req);
    if (CkHttp_getLastMethodSuccess(http) != TRUE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkJsonObject_Dispose(json);
        CkHttpRequest_Dispose(req);
        CkHttp_Dispose(http);
        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);
        return;
    }

    CkHttpResponse_Dispose(resp);

    // 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);
    CkFileAccess_Dispose(fac);

    }