(Unicode C++) HMRC Validate Fraud Prevention Headers

Demonstrates how to test (validate) HMRC fraud prevention headers.

Chilkat C/C++ Library Downloads
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#include <CkRestW.h>
#include <CkJsonObjectW.h>
#include <CkStringBuilderW.h>

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

    CkRestW rest;

    bool success = rest.Connect(L"test-api.service.hmrc.gov.uk",443,true,true);
    if (success == false) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // Load the previously fetched access token.
    CkJsonObjectW json;
    success = json.LoadFile(L"qa_data/tokens/hmrc.json");
    const wchar_t *accessToken = json.stringOf(L"access_token");
    wprintf(L"Using access toke: %s\n",accessToken);

    CkStringBuilderW sbAuthHeaderValue;
    sbAuthHeaderValue.Append(L"Bearer ");
    sbAuthHeaderValue.Append(accessToken);

    rest.AddHeader(L"Accept",L"application/vnd.hmrc.1.0+json");
    rest.AddHeader(L"Authorization",sbAuthHeaderValue.getAsString());

    // Add the fraud prevention headers.
    // See https://developer.service.hmrc.gov.uk/api-documentation/docs/fraud-prevention
    rest.AddHeader(L"gov-client-connection-method",L"DESKTOP_APP_DIRECT");

    // This should be generated by an application and persistently stored on the device. The identifier should not expire.
    rest.AddHeader(L"gov-client-device-id",L"beec798b-b366-47fa-b1f8-92cede14a1ce");

    // See https://developer.service.hmrc.gov.uk/api-documentation/docs/fraud-prevention
    rest.AddHeader(L"gov-client-user-ids",L"os=user123");

    // Your local IP addresses (comma separated), such as addresses beginning with "192.168." or "172.16."
    rest.AddHeader(L"gov-client-local-ips",L"172.16.16.23");
    // You'll need to find a way to get your MAC address.  Chilkat does not yet provide this ability...
    rest.AddHeader(L"gov-client-mac-addresses",L"7C%3AD3%3A0A%3A25%3ADA%3A1C");

    rest.AddHeader(L"gov-client-timezone",L"UTC+00:00");

    // You can probably just hard-code these so they're always the same with each request.
    rest.AddHeader(L"gov-client-window-size",L"width=1256&height=800");
    rest.AddHeader(L"gov-client-screens",L"width=1920&height=1080&scaling-factor=1&colour-depth=16");
    rest.AddHeader(L"gov-client-user-agent",L"Windows/Server%202012 (Dell%20Inc./OptiPlex%20980)");
    rest.AddHeader(L"gov-vendor-version",L"My%20Desktop%20Software=1.2.3.build4286");

    const wchar_t *responseStr = rest.fullRequestNoBody(L"GET",L"/test/fraud-prevention-headers/validate");
    if (rest.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",rest.lastErrorText());
        return;
    }

    // If the status code is 200, then the fraud prevention headers were validated.
    // The JSON response may include some warnings..
    wprintf(L"Response status code = %d\n",rest.get_ResponseStatusCode());
    wprintf(L"Response JSON body: \n");
    wprintf(L"%s\n",responseStr);
    }