Go Requires Chilkat v11.0.0+

Walmart Partner API Authentication (Generate a Signature for a Request)

See more RSA Examples

Demonstrates how to generate a signature for a Walmart Partner REST API call. Go

    success := false

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

    consumerId := "b68d2a72...."
    baseUrl := "https://marketplace.walmartapis.com/v2/feeds"
    //  This is your Base64 encoded private key
    privateEncodedStr := "MIICeAIBADANBgkqhkiG9w0BAQEFAA......"
    httpMethod := "GET"

    //  We need a timestamp in decimal string form representing the number of milliseconds since Jan 01 1970 UTC.
    dt := chilkat.NewCkDateTime()
    //  Set bLocal = true for a timestamp in the local timezone.  Set bLocal = false for a UTC timestamp.
    bLocal := false
    //  This gets the timestamp in seconds, not milliseconds.
    timeStampVal := dt.GetAsUnixTime(bLocal)

    //  Build the string to sign.
    sbStringToSign := chilkat.NewStringBuilder()
    sbStringToSign.Append(consumerId)
    sbStringToSign.Append("\n")
    sbStringToSign.Append(baseUrl)
    sbStringToSign.Append("\n")
    sbStringToSign.Append(httpMethod)
    sbStringToSign.Append("\n")
    sbStringToSign.AppendInt(timeStampVal)
    //  We add three zero's so that the timestamp value is in milliseconds.
    //  We don't care about accuracy down to less than a second.
    //  All the server cares about is that the request was signed at the current date/time
    //  within some reasonable margin of error (to account for systems having clocks
    //  that may be slightly different).
    sbStringToSign.Append("000\n")

    privKey := chilkat.NewPrivateKey()
    //  Load the private key into a private key object.
    //  Note: Technically the private key is not PEM because it lacks the header/footer strings
    //  used for PEM.  However, the LoadPem method will still accept it and load it correctly.
    success = privKey.LoadPem(privateEncodedStr)
    if success == false {
        fmt.Println(privKey.LastErrorText())
        dt.DisposeCkDateTime()
        sbStringToSign.DisposeStringBuilder()
        privKey.DisposePrivateKey()
        return
    }

    rsa := chilkat.NewRsa()
    success = rsa.UsePrivateKey(privKey)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        dt.DisposeCkDateTime()
        sbStringToSign.DisposeStringBuilder()
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        return
    }

    //  We want a base64 signature string.
    rsa.SetEncodingMode("base64")

    signatureString := rsa.SignStringENC(*sbStringToSign.GetAsString(),"SHA256")
    if rsa.LastMethodSuccess() == false {
        fmt.Println(rsa.LastErrorText())
        dt.DisposeCkDateTime()
        sbStringToSign.DisposeStringBuilder()
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        return
    }

    fmt.Println("Signature String: ", *signatureString)

    dt.DisposeCkDateTime()
    sbStringToSign.DisposeStringBuilder()
    privKey.DisposePrivateKey()
    rsa.DisposeRsa()