(Objective-C) ABN AMRO OAuth2 Client Credentials Authentication

Demonstrates how to obtain an access token for an ABN AMRO online API using OAuth2 with the Client Credentials flow.

For more information, see https://developer.abnamro.com/api/payment-initiation-v1/payment-initiation-tutorial

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#import <CkoCert.h>
#import <CkoBinData.h>
#import <CkoPrivateKey.h>
#import <CkoHttp.h>
#import <CkoHttpRequest.h>
#import <CkoHttpResponse.h>
#import <CkoJsonObject.h>

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

// This example sends the following CURL request:

// 	curl -X POST -k https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2 \
// 	-v \
// 	--cert TPPCertificate.crt \
// 	--key TPPprivateKey.key \
// 	-H 'Cache-Control: no-cache' \
// 	-H 'Content-Type: application/x-www-form-urlencoded' \
// 	-d 'grant_type=client_credentials&client_id=TPP_test&scope=psd2:payment:sepa:write psd2:payment:sepa:read'

CkoCert *cert = [[CkoCert alloc] init];
BOOL success = [cert LoadFromFile: @"qa_data/certs/TPPCertificate.cer"];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

CkoBinData *bdKey = [[CkoBinData alloc] init];
success = [bdKey LoadFile: @"qa_data/certs/TPPprivateKey.key"];

CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [privKey LoadAnyFormat: bdKey password: @"passwordIfNeeded"];
if (success != YES) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

success = [cert SetPrivateKey: privKey];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

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

success = [http SetSslClientCert: cert];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];
[req AddParam: @"grant_type" value: @"client_credentials"];
[req AddParam: @"client_id" value: @"TPP_test"];
[req AddParam: @"scope" value: @"psd2:payment:sepa:write psd2:payment:sepa:read"];

CkoHttpResponse *resp = [http PostUrlEncoded: @"https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2" req: req];
if (http.LastMethodSuccess == NO) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

if ([resp.StatusCode intValue] != 200) {
    NSLog(@"%@",resp.BodyStr);

    return;
}

// Get the JSON result:
// {"access_token":"TIhycwl8rfrZPkXGw15mwldASAAK","token_type":"Bearer","expires_in":7200}
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json Load: resp.BodyStr];
NSLog(@"%@%@",@"access_token: ",[json StringOf: @"access_token"]);
NSLog(@"%@%@",@"token_type: ",[json StringOf: @"token_type"]);
NSLog(@"%@%@",@"expires_in: ",[json StringOf: @"expires_in"]);