(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.

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

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

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#include <C_CkCert.h>
#include <C_CkBinData.h>
#include <C_CkPrivateKey.h>
#include <C_CkHttp.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttpResponse.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkCert cert;
    HCkBinData bdKey;
    HCkPrivateKey privKey;
    HCkHttp http;
    HCkHttpRequest req;
    HCkHttpResponse resp;
    HCkJsonObject json;

    success = FALSE;

    // 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'

    cert = CkCert_Create();
    success = CkCert_LoadFromFile(cert,"qa_data/certs/TPPCertificate.cer");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        return;
    }

    bdKey = CkBinData_Create();
    success = CkBinData_LoadFile(bdKey,"qa_data/certs/TPPprivateKey.key");

    privKey = CkPrivateKey_Create();
    success = CkPrivateKey_LoadAnyFormat(privKey,bdKey,"passwordIfNeeded");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdKey);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    success = CkCert_SetPrivateKey(cert,privKey);
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdKey);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    http = CkHttp_Create();

    success = CkHttp_SetSslClientCert(http,cert);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdKey);
        CkPrivateKey_Dispose(privKey);
        CkHttp_Dispose(http);
        return;
    }

    req = CkHttpRequest_Create();
    CkHttpRequest_AddParam(req,"grant_type","client_credentials");
    CkHttpRequest_AddParam(req,"client_id","TPP_test");
    CkHttpRequest_AddParam(req,"scope","psd2:payment:sepa:write psd2:payment:sepa:read");

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

    resp = CkHttpResponse_Create();
    success = CkHttp_HttpReq(http,"https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2",req,resp);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdKey);
        CkPrivateKey_Dispose(privKey);
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkHttpResponse_Dispose(resp);
        return;
    }

    if (CkHttpResponse_getStatusCode(resp) != 200) {
        printf("%s\n",CkHttpResponse_bodyStr(resp));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdKey);
        CkPrivateKey_Dispose(privKey);
        CkHttp_Dispose(http);
        CkHttpRequest_Dispose(req);
        CkHttpResponse_Dispose(resp);
        return;
    }

    // Get the JSON result:
    // {"access_token":"TIhycwl8rfrZPkXGw15mwldASAAK","token_type":"Bearer","expires_in":7200}
    json = CkJsonObject_Create();
    CkJsonObject_Load(json,CkHttpResponse_bodyStr(resp));
    printf("access_token: %s\n",CkJsonObject_stringOf(json,"access_token"));
    printf("token_type: %s\n",CkJsonObject_stringOf(json,"token_type"));
    printf("expires_in: %s\n",CkJsonObject_stringOf(json,"expires_in"));


    CkCert_Dispose(cert);
    CkBinData_Dispose(bdKey);
    CkPrivateKey_Dispose(privKey);
    CkHttp_Dispose(http);
    CkHttpRequest_Dispose(req);
    CkHttpResponse_Dispose(resp);
    CkJsonObject_Dispose(json);

    }