(Objective-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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#import <CkoJsonObject.h>
#import <CkoHttpRequest.h>
#import <CkoHttp.h>
#import <CkoHttpResponse.h>
#import <CkoFileAccess.h>

// 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

CkoJsonObject *json = [[CkoJsonObject alloc] init];
BOOL success = [json LoadFile: @"qa_data/tokens/rabobank.json"];
if (success != YES) {
    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

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
[req AddParam: @"grant_type" value: @"refresh_token"];
[req AddParam: @"refresh_token" value: [json StringOf: @"refresh_token"]];

CkoHttp *http = [[CkoHttp alloc] init];

// Causes the "Authorization: Basic BASE64(CLIENT_ID + ":" + CLIENT_SECRET)" header to be added..
http.BasicAuth = YES;
http.Login = @"YOUR_APP_CLIENT_ID";
http.Password = @"YOUR_APP_CLIENT_SECRET";

CkoHttpResponse *resp = [http PostUrlEncoded: @"https://api-sandbox.rabobank.nl/openapi/sandbox/oauth2/token" req: req];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// Load the JSON response.
[json Load: resp.BodyStr];
json.EmitCompact = NO;

// Show the JSON response.
NSLog(@"%@",[json Emit]);

NSLog(@"%@%d",@"Response status code: ",[resp.StatusCode intValue]);

// If the response status code is not 200, then it's an error.
if ([resp.StatusCode intValue] != 200) {
    return;
}

// Save the refreshed access token JSON to a file for future requests.
CkoFileAccess *fac = [[CkoFileAccess alloc] init];
[fac WriteEntireTextFile: @"qa_data/tokens/rabobank.json" fileData: [json Emit] charset: @"utf-8" includePreamble: NO];