(Go) Convert Let's Encrypt PEM Files to a PFX

Demonstrates how to convert the .pem files provided by Let's Encrypt to a single PFX.

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

    // Let's Encrypt provides four .pem files
    // 1. fullchain.pem
    // 2. privkey.pem
    // 3. cert.pem
    // 4. chain.pem

    // The cert.pem and chain.pem are redundant. 
    // The fullchain.pem is composed of the cert.pem and chain.pem.

    // To convert the PEM's to a single .pfx, we don't need the redundant data.
    // The privkey.pem and fullchain.pem provide the required data.
    // We can ignore cert.pem and chain.pem (because those certs are already found in fullchain.pem).

    // We need a single .pem file that contains both the private key, the cert,
    // and the certs in the chain of authentication.
    // Let's combine priveky.pem and fullchain.pem into a single .pem

    sbPem := chilkat.NewStringBuilder()
    success := sbPem.LoadFile("qa_data/pem/lets_encrypt/privkey.pem","utf-8")
    if success == false {
        fmt.Println("Failed to load privkey.pem")
        sbPem.DisposeStringBuilder()
        return
    }

    // To be safe, append a blank line..
    sbPem.AppendLine("",false)

    sbFullChainPem := chilkat.NewStringBuilder()
    success = sbFullChainPem.LoadFile("qa_data/pem/lets_encrypt/fullchain.pem","utf-8")
    if success == false {
        fmt.Println("Failed to load fullchain.pem")
        sbPem.DisposeStringBuilder()
        sbFullChainPem.DisposeStringBuilder()
        return
    }

    // Append the full cert chain PEM to the private key PEM.
    sbPem.AppendSb(sbFullChainPem)

    // Load the combined PEM into a Chilkat PFX object.
    pfx := chilkat.NewPfx()
    success = pfx.LoadPem(*sbPem.GetAsString(),"no password required")
    if success == false {
        fmt.Println(pfx.LastErrorText())
        sbPem.DisposeStringBuilder()
        sbFullChainPem.DisposeStringBuilder()
        pfx.DisposePfx()
        return
    }

    // Write the PFX w/ a password.
    pfxPassword := "secret"
    success = pfx.ToFile(pfxPassword,"qa_output/sample.pfx")
    if success == false {
        fmt.Println(pfx.LastErrorText())
        sbPem.DisposeStringBuilder()
        sbFullChainPem.DisposeStringBuilder()
        pfx.DisposePfx()
        return
    }

    fmt.Println("Success!")

    sbPem.DisposeStringBuilder()
    sbFullChainPem.DisposeStringBuilder()
    pfx.DisposePfx()