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

    // 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 != TRUE) {
        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 != TRUE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdKey);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    success = CkCert_SetPrivateKey(cert,privKey);
    if (success != TRUE) {
        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 != TRUE) {
        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");

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

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

    CkHttpResponse_Dispose(resp);


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

    }