(Lianja) HMRC Validate Fraud Prevention Headers

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

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loRest = createobject("CkRest")

llSuccess = loRest.Connect("test-api.service.hmrc.gov.uk",443,.T.,.T.)
if (llSuccess = .F.) then
    ? loRest.LastErrorText
    release loRest
    return
endif

// Load the previously fetched access token.
loJson = createobject("CkJsonObject")
llSuccess = loJson.LoadFile("qa_data/tokens/hmrc.json")
lcAccessToken = loJson.StringOf("access_token")
? "Using access toke: " + lcAccessToken

loSbAuthHeaderValue = createobject("CkStringBuilder")
loSbAuthHeaderValue.Append("Bearer ")
loSbAuthHeaderValue.Append(lcAccessToken)

loRest.AddHeader("Accept","application/vnd.hmrc.1.0+json")
loRest.AddHeader("Authorization",loSbAuthHeaderValue.GetAsString())

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

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

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

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

loRest.AddHeader("gov-client-timezone","UTC+00:00")

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

lcResponseStr = loRest.FullRequestNoBody("GET","/test/fraud-prevention-headers/validate")
if (loRest.LastMethodSuccess = .F.) then
    ? loRest.LastErrorText
    release loRest
    release loJson
    release loSbAuthHeaderValue
    return
endif

// If the status code is 200, then the fraud prevention headers were validated.
// The JSON response may include some warnings..
? "Response status code = " + str(loRest.ResponseStatusCode)
? "Response JSON body: "
? lcResponseStr


release loRest
release loJson
release loSbAuthHeaderValue