VBScript

ING Open Banking OAuth2 Client Credentials

See more OAuth2 Examples

Demonstrates how to get an access token for the ING Open Banking APIs using client credentials. VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

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

set cert = CreateObject("Chilkat.Cert")
success = cert.LoadFromFile("qa_data/certs_and_keys/ING/example_client_tls.cer")
If (success = 0) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

set bdPrivKey = CreateObject("Chilkat.BinData")
success = bdPrivKey.LoadFile("qa_data/certs_and_keys/ING/example_client_tls.key")
If (success = 0) Then
    outFile.WriteLine("Failed to load example_client_tls.key")
    WScript.Quit
End If

' The OAuth 2.0 client_id for these certificates is e77d776b-90af-4684-bebc-521e5b2614dd. 
' Please note down this client_id since you will need it in the next steps to call the API.

set privKey = CreateObject("Chilkat.PrivateKey")
success = privKey.LoadAnyFormat(bdPrivKey,"")
If (success = 0) Then
    outFile.WriteLine(privKey.LastErrorText)
    WScript.Quit
End If

' Associate the private key with the certificate.
success = cert.SetPrivateKey(privKey)
If (success = 0) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

set http = CreateObject("Chilkat.Http")

success = http.SetSslClientCert(cert)
If (success = 0) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

' Calculate the Digest and add the "Digest" header.  Do the equivalent of this:
' payload="grant_type=client_credentials"
' payloadDigest=`echo -n "$payload" | openssl dgst -binary -sha256 | openssl base64`
' digest=SHA-256=$payloadDigest
set crypt = CreateObject("Chilkat.Crypt2")
crypt.HashAlgorithm = "SHA256"
crypt.EncodingMode = "base64"
payload = "grant_type=client_credentials"
payloadDigest = crypt.HashStringENC(payload)

' Calculate the current date/time and add the Date header.  
' reqDate=$(LC_TIME=en_US.UTF-8 date -u "+%a, %d %b %Y %H:%M:%S GMT")  
set dt = CreateObject("Chilkat.CkDateTime")
success = dt.SetFromCurrentSystemTime()
' The desire date/time format is the "RFC822" format.
http.SetRequestHeader "Date",dt.GetAsRfc822(0)

' Calculate signature for signing your request
' Duplicate the following code:

' 	httpMethod="post"
' 	reqPath="/oauth2/token"
' 	signingString="(request-target): $httpMethod $reqPath
' 	date: $reqDate
' 	digest: $digest"
' 	signature=`printf "$signingString" | openssl dgst -sha256 -sign "${certPath}example_client_signing.key" -passin "pass:changeit" | openssl base64 -A`

httpMethod = "POST"
reqPath = "/oauth2/token"

set sbStringToSign = CreateObject("Chilkat.StringBuilder")
success = sbStringToSign.Append("(request-target): ")
success = sbStringToSign.Append(httpMethod)
success = sbStringToSign.ToLowercase()
success = sbStringToSign.Append(" ")
success = sbStringToSign.AppendLine(reqPath,0)

success = sbStringToSign.Append("date: ")
success = sbStringToSign.AppendLine(dt.GetAsRfc822(0),0)

success = sbStringToSign.Append("digest: SHA-256=")
success = sbStringToSign.Append(payloadDigest)

set signingPrivKey = CreateObject("Chilkat.PrivateKey")
success = signingPrivKey.LoadPemFile("qa_data/certs_and_keys/ING/example_client_signing.key")
If (success = 0) Then
    outFile.WriteLine(signingPrivKey.LastErrorText)
    WScript.Quit
End If

set rsa = CreateObject("Chilkat.Rsa")
success = rsa.UsePrivateKey(signingPrivKey)
If (success = 0) Then
    outFile.WriteLine(rsa.LastErrorText)
    WScript.Quit
End If

rsa.EncodingMode = "base64"
b64Signature = rsa.SignStringENC(sbStringToSign.GetAsString(),"SHA256")

set sbAuthHdrVal = CreateObject("Chilkat.StringBuilder")
success = sbAuthHdrVal.Append("Signature keyId=""e77d776b-90af-4684-bebc-521e5b2614dd"",")
success = sbAuthHdrVal.Append("algorithm=""rsa-sha256"",")
success = sbAuthHdrVal.Append("headers=""(request-target) date digest"",")
success = sbAuthHdrVal.Append("signature=""")
success = sbAuthHdrVal.Append(b64Signature)
success = sbAuthHdrVal.Append("""")

set sbDigestHdrVal = CreateObject("Chilkat.StringBuilder")
success = sbDigestHdrVal.Append("SHA-256=")
success = sbDigestHdrVal.Append(payloadDigest)

' Do the following CURL statement:

' 	curl -i -X POST "${httpHost}${reqPath}" \
' 	-H 'Accept: application/json' \
' 	-H 'Content-Type: application/x-www-form-urlencoded' \
' 	-H "Digest: ${digest}" \
' 	-H "Date: ${reqDate}" \
' 	-H "authorization: Signature keyId=\"$keyId\",algorithm=\"rsa-sha256\",headers=\"(request-target) date digest\",signature=\"$signature\"" \
' 	-d "${payload}" \
' 	--cert "${certPath}tlsCert.crt" \
' 	--key "${certPath}tlsCert.key"

set req = CreateObject("Chilkat.HttpRequest")
req.AddParam "grant_type","client_credentials"
req.AddHeader "Accept","application/json"
req.AddHeader "Date",dt.GetAsRfc822(0)
req.AddHeader "Digest",sbDigestHdrVal.GetAsString()
req.AddHeader "Authorization",sbAuthHdrVal.GetAsString()

req.HttpVerb = "POST"
req.ContentType = "application/x-www-form-urlencoded"

set resp = CreateObject("Chilkat.HttpResponse")
success = http.HttpReq("https://api.sandbox.ing.com/oauth2/token",req,resp)
If (success = 0) Then
    outFile.WriteLine(http.LastErrorText)
    WScript.Quit
End If

' If successful, the status code = 200
outFile.WriteLine("Response Status Code: " & resp.StatusCode)
outFile.WriteLine(resp.BodyStr)

set json = CreateObject("Chilkat.JsonObject")
success = json.Load(resp.BodyStr)

json.EmitCompact = 0
outFile.WriteLine(json.Emit())

' A successful response contains an access token such as:
' {
'   "access_token": "eyJhbGc ... bxI_SoPOBH9xmoM",
'   "expires_in": 905,
'   "scope": "payment-requests:view payment-requests:create payment-requests:close greetings:view virtual-ledger-accounts:fund-reservation:create virtual-ledger-accounts:fund-reservation:delete virtual-ledger-accounts:balance:view",
'   "token_type": "Bearer",
'   "keys": [
'     {
'       "kty": "RSA",
'       "n": "3l3rdz4...04VPkdV",
'       "e": "AQAB",
'       "use": "sig",
'       "alg": "RS256",
'       "x5t": "3c396700fc8cd709cf9cb5452a22bcde76985851"
'     }
'   ],
'   "client_id": "e77d776b-90af-4684-bebc-521e5b2614dd"
' }

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

access_token = json.StringOf("access_token")
expires_in = json.IntOf("expires_in")
scope = json.StringOf("scope")
token_type = json.StringOf("token_type")
client_id = json.StringOf("client_id")
i = 0
count_i = json.SizeOfArray("keys")
Do While i < count_i
    json.I = i
    kty = json.StringOf("keys[i].kty")
    n = json.StringOf("keys[i].n")
    e = json.StringOf("keys[i].e")
    use = json.StringOf("keys[i].use")
    alg = json.StringOf("keys[i].alg")
    x5t = json.StringOf("keys[i].x5t")
    i = i + 1
Loop

' This example will save the JSON containing the access key to a file so that
' a subsequent example can load it and then use the access key for a request, such as to create a payment request.
success = json.WriteFile("qa_data/tokens/ing_access_token.json")

outFile.Close