Chilkat Examples

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(Go) ING Open Banking OAuth2 Client Credentials

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

For more information, see https://developer.ing.com/openbanking/get-started/openbanking

Chilkat Go Downloads

Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    cert := chilkat.NewCert()
    success := cert.LoadFromFile("qa_data/certs_and_keys/ING/example_client_tls.cer")
    if success == false {
        fmt.Println(cert.LastErrorText())
        cert.DisposeCert()
        return
    }

    bdPrivKey := chilkat.NewBinData()
    success = bdPrivKey.LoadFile("qa_data/certs_and_keys/ING/example_client_tls.key")
    if success == false {
        fmt.Println("Failed to load example_client_tls.key")
        cert.DisposeCert()
        bdPrivKey.DisposeBinData()
        return
    }

    // 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.

    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadAnyFormat(bdPrivKey,"")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        cert.DisposeCert()
        bdPrivKey.DisposeBinData()
        privKey.DisposePrivateKey()
        return
    }

    // Associate the private key with the certificate.
    success = cert.SetPrivateKey(privKey)
    if success == false {
        fmt.Println(cert.LastErrorText())
        cert.DisposeCert()
        bdPrivKey.DisposeBinData()
        privKey.DisposePrivateKey()
        return
    }

    http := chilkat.NewHttp()

    success = http.SetSslClientCert(cert)
    if success == false {
        fmt.Println(http.LastErrorText())
        cert.DisposeCert()
        bdPrivKey.DisposeBinData()
        privKey.DisposePrivateKey()
        http.DisposeHttp()
        return
    }

    // 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
    crypt := chilkat.NewCrypt2()
    crypt.SetHashAlgorithm("SHA256")
    crypt.SetEncodingMode("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")  
    dt := chilkat.NewCkDateTime()
    dt.SetFromCurrentSystemTime()
    // The desire date/time format is the "RFC822" format.
    http.SetRequestHeader("Date",*dt.GetAsRfc822(false))

    // 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"

    sbStringToSign := chilkat.NewStringBuilder()
    sbStringToSign.Append("(request-target): ")
    sbStringToSign.Append(httpMethod)
    sbStringToSign.ToLowercase()
    sbStringToSign.Append(" ")
    sbStringToSign.AppendLine(reqPath,false)

    sbStringToSign.Append("date: ")
    sbStringToSign.AppendLine(*dt.GetAsRfc822(false),false)

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

    signingPrivKey := chilkat.NewPrivateKey()
    success = signingPrivKey.LoadPemFile("qa_data/certs_and_keys/ING/example_client_signing.key")
    if success == false {
        fmt.Println(signingPrivKey.LastErrorText())
        cert.DisposeCert()
        bdPrivKey.DisposeBinData()
        privKey.DisposePrivateKey()
        http.DisposeHttp()
        crypt.DisposeCrypt2()
        dt.DisposeCkDateTime()
        sbStringToSign.DisposeStringBuilder()
        signingPrivKey.DisposePrivateKey()
        return
    }

    rsa := chilkat.NewRsa()
    success = rsa.ImportPrivateKeyObj(signingPrivKey)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        cert.DisposeCert()
        bdPrivKey.DisposeBinData()
        privKey.DisposePrivateKey()
        http.DisposeHttp()
        crypt.DisposeCrypt2()
        dt.DisposeCkDateTime()
        sbStringToSign.DisposeStringBuilder()
        signingPrivKey.DisposePrivateKey()
        rsa.DisposeRsa()
        return
    }

    rsa.SetEncodingMode("base64")
    b64Signature := rsa.SignStringENC(*sbStringToSign.GetAsString(),"SHA256")

    sbAuthHdrVal := chilkat.NewStringBuilder()
    sbAuthHdrVal.Append("Signature keyId=\"e77d776b-90af-4684-bebc-521e5b2614dd\",")
    sbAuthHdrVal.Append("algorithm=\"rsa-sha256\",")
    sbAuthHdrVal.Append("headers=\"(request-target) date digest\",")
    sbAuthHdrVal.Append("signature=\"")
    sbAuthHdrVal.Append(b64Signatur*b64Signature)
    sbAuthHdrVal.Append("\"")

    sbDigestHdrVal := chilkat.NewStringBuilder()
    sbDigestHdrVal.Append("SHA-256=")
    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"

    req := chilkat.NewHttpRequest()
    req.AddParam("grant_type","client_credentials")
    req.AddHeader("Accept","application/json")
    req.AddHeader("Date",*dt.GetAsRfc822(false))
    req.AddHeader("Digest",*sbDigestHdrVal.GetAsString())
    req.AddHeader("Authorization",*sbAuthHdrVal.GetAsString())
    resp := http.PostUrlEncoded("https://api.sandbox.ing.com/oauth2/token",req)
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        cert.DisposeCert()
        bdPrivKey.DisposeBinData()
        privKey.DisposePrivateKey()
        http.DisposeHttp()
        crypt.DisposeCrypt2()
        dt.DisposeCkDateTime()
        sbStringToSign.DisposeStringBuilder()
        signingPrivKey.DisposePrivateKey()
        rsa.DisposeRsa()
        sbAuthHdrVal.DisposeStringBuilder()
        sbDigestHdrVal.DisposeStringBuilder()
        req.DisposeHttpRequest()
        return
    }

    // If successful, the status code = 200
    fmt.Println("Response Status Code: ", resp.StatusCode())
    fmt.Println(resp.BodyStr())

    json := chilkat.NewJsonObject()
    json.Load(resp.BodyStr())

    resp.DisposeHttpResponse()

    json.SetEmitCompact(false)
    fmt.Println(*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

    var kty *string = new(string)
    var n *string = new(string)
    var e *string = new(string)
    var use *string = new(string)
    var alg *string = new(string)
    var x5t *string = new(string)

    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")
    for i < count_i {
        json.SetI(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
    }

    // 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.
    json.WriteFile("qa_data/tokens/ing_access_token.json")

    cert.DisposeCert()
    bdPrivKey.DisposeBinData()
    privKey.DisposePrivateKey()
    http.DisposeHttp()
    crypt.DisposeCrypt2()
    dt.DisposeCkDateTime()
    sbStringToSign.DisposeStringBuilder()
    signingPrivKey.DisposePrivateKey()
    rsa.DisposeRsa()
    sbAuthHdrVal.DisposeStringBuilder()
    sbDigestHdrVal.DisposeStringBuilder()
    req.DisposeHttpRequest()
    json.DisposeJsonObject()

 

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