Go

Ibanity HTTP Signature for XS2A, Isabel Connect, Ponto Connect

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Demonstrates how to add a Signature header for Ibanity HTTP requests. Go

    success := false

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

    // In order to sign your HTTP requests, you have to add 2 headers to the HTTP request: Digest: the digest of the request payload and Signature: the actual signature of the request. 

    // POST /xs2a/customer-access-tokens HTTP/1.1
    // Host: api.ibanity.com
    // Content-Type: application/json
    // Digest: SHA-512=z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==
    // Ibanity-Idempotency-Key: 61f02718-eeee-46e1-b5eb-e8fd6e799c2d
    // Signature: keyId="62f02718-eeee-46e1-b5eb-e8fd6e799c2e",created=1599659223,algorithm="hs2019",headers="(request-target) host digest (created) ibanity-idempotency-key",signature="SjWJWbWN7i0...zsbM="
    // 
    // {"data":{"type":"customerAccessToken", "attributes":{"applicationCustomerReference":"15874569"}}}

    // The payload (body) of the above HTTP request is the JSON.
    // Build the JSON above.
    // Use this online tool to generate code from sample JSON: 
    // Generate Code to Create JSON
    json := chilkat.NewJsonObject()
    json.UpdateString("data.type","customerAccessToken")
    json.UpdateString("data.attributes.applicationCustomerReference","15874569")

    payload := json.Emit()
    fmt.Println("payload = ", *payload)

    // Step 1: Build the (created) virtual header

    dtNow := chilkat.NewCkDateTime()
    dtNow.SetFromCurrentSystemTime()
    created := dtNow.GetAsUnixTimeStr(false)
    fmt.Println("created = ", *created)

    // Step 2: Build the Digest header
    crypt := chilkat.NewCrypt2()
    crypt.SetHashAlgorithm("sha512")
    crypt.SetEncodingMode("base64")
    crypt.SetCharset("utf-8")

    sbDigestHdrValue := chilkat.NewStringBuilder()
    sbDigestHdrValue.Append("SHA-512=")
    sbDigestHdrValue.Append(*crypt.HashStringENC(*json.Emit()))

    fmt.Println(*sbDigestHdrValue.GetAsString())

    // Step 3: Build the (request target) virtual header

    // In order to build the signature you will need a virtual header named (request-target) (the parentheses are important). 
    // The (request-target) is the string concatenation of the HTTP method (in lowercase) with the path and query parameters.
    request_target := "post /xs2a/customer-access-tokens"

    // Step 4: Build the signing string

    // The signing string is the concatenation of the signed header names (in lowercase) and values separated by a LF.

    // You must always sign the following headers: (request-target), host, (created), digest. 
    // If used, you must also sign the authorization header and any ibanity-* headers, such as ibanity-idempotency-key. 

    sbSigningString := chilkat.NewStringBuilder()
    sbSigningString.Append("(request-target): ")
    sbSigningString.AppendLine(request_target,false)
    sbSigningString.Append("host: ")
    sbSigningString.AppendLine("api.ibanity.com",false)
    sbSigningString.Append("digest: ")
    sbSigningString.AppendLine(*sbDigestHdrValue.GetAsString(),false)
    sbSigningString.Append("(created): ")
    sbSigningString.AppendLine(*created,false)
    sbSigningString.Append("ibanity-idempotency-key: ")
    idempotencyKey := crypt.GenerateUuid()
    sbSigningString.Append(*idempotencyKey)

    // Step 5: Build the signed headers list

    // To allow Ibanity to check the signed headers, you must provide a list of the header names. They should be lowercase and in the same order used to create the signing string. 
    signed_headers_list := "(request-target) host digest (created) ibanity-idempotency-key"

    // Step 6: Build the Signature header

    // This is where the real signing happens. The signature header is a combination of several sub-headers -
    // 
    //     keyId: the identifier for the application's signature certificate, obtained from the Developer Portal
    //     algorithm: the digital signature algorithm used to generate the signature (must be hs2019)
    //     headers: The list of HTTP headers created in step 5
    //     signature: the Base64-encoded digital signature of the signing string created in step 4.

    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadEncryptedPemFile("my_ibanity_signature_private_key.pem","pem_password")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        json.DisposeJsonObject()
        dtNow.DisposeCkDateTime()
        crypt.DisposeCrypt2()
        sbDigestHdrValue.DisposeStringBuilder()
        sbSigningString.DisposeStringBuilder()
        privKey.DisposePrivateKey()
        return
    }

    rsa := chilkat.NewRsa()
    rsa.SetPssSaltLen(32)
    rsa.SetEncodingMode("base64")
    // Use the RSASSA-PSS signature algorithm
    rsa.SetPkcsPadding(false)

    success = rsa.UsePrivateKey(privKey)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        json.DisposeJsonObject()
        dtNow.DisposeCkDateTime()
        crypt.DisposeCrypt2()
        sbDigestHdrValue.DisposeStringBuilder()
        sbSigningString.DisposeStringBuilder()
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        return
    }

    // Sign the signing string.
    sigBase64 := rsa.SignStringENC(*sbSigningString.GetAsString(),"sha-256")
    if rsa.LastMethodSuccess() == false {
        fmt.Println(rsa.LastErrorText())
        json.DisposeJsonObject()
        dtNow.DisposeCkDateTime()
        crypt.DisposeCrypt2()
        sbDigestHdrValue.DisposeStringBuilder()
        sbSigningString.DisposeStringBuilder()
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        return
    }

    // Build the signature header value.
    sbSigHeaderValue := chilkat.NewStringBuilder()
    sbSigHeaderValue.Append("keyId=\"")
    // Use your identifier for the application's signature certificate, obtained from the Developer Portal
    sbSigHeaderValue.Append("62f02718-eeee-46e1-b5eb-e8fd6e799c2e")
    sbSigHeaderValue.Append("\",created=")
    sbSigHeaderValue.Append(*created)
    sbSigHeaderValue.Append(",algorithm=\"hs2019\",headers=\"")
    sbSigHeaderValue.Append(signed_headers_list)
    sbSigHeaderValue.Append("\",signature=\"")
    sbSigHeaderValue.Append(*sigBase64)
    sbSigHeaderValue.Append("\"")

    fmt.Println(*sbSigHeaderValue.GetAsString())

    json.DisposeJsonObject()
    dtNow.DisposeCkDateTime()
    crypt.DisposeCrypt2()
    sbDigestHdrValue.DisposeStringBuilder()
    sbSigningString.DisposeStringBuilder()
    privKey.DisposePrivateKey()
    rsa.DisposeRsa()
    sbSigHeaderValue.DisposeStringBuilder()