How Can I Simplify SOAP/WSDL Handling in Go Using the xmlutil Package?

Supporting SOAP/WSDL in Go

Despite the lack of native support for WSDL in Go, it's possible to manually encode and decode SOAP requests and responses. However, this process can be intricate and vary across different servers.

Alternative Approach with GitHub Package

To address these challenges, the GitHub package xmlutil (https://github.com/webconnex/xmlutil) offers a solution. It simplifies SOAP handling by allowing you to specify that a server requires xsi types, eliminating the need for complex customizations.

Implementation Example

Below is an example of using xmlutil to handle SOAP:

package main

import (
    "bytes"
    "fmt"
    "github.com/webconnex/xmlutil"
    "log"
)

type Envelope struct {
    Body `xml:"soap:"`
}

type Body struct {
    Msg interface{}
}

type MethodCall struct {
    One string
    Two string
}

type MethodCallResponse struct {
    Three string
}

func main() {
    x := xmlutil.NewXmlUtil()
    x.RegisterNamespace("http://www.w3.org/2001/XMLSchema-instance", "xsi")
    x.RegisterNamespace("http://www.w3.org/2001/XMLSchema", "xsd")
    x.RegisterNamespace("http://www.w3.org/2003/05/soap-envelope", "soap")
    x.RegisterTypeMore(Envelope{}, xml.Name{"http://www.w3.org/2003/05/soap-envelope", ""},
        []xml.Attr{
            xml.Attr{xml.Name{"xmlns", "xsi"}, "http://www.w3.org/2001/XMLSchema-instance"},
            xml.Attr{xml.Name{"xmlns", "xsd"}, "http://www.w3.org/2001/XMLSchema"},
            xml.Attr{xml.Name{"xmlns", "soap"}, "http://www.w3.org/2003/05/soap-envelope"},
        })
    x.RegisterTypeMore("", xml.Name{}, []xml.Attr{
        xml.Attr{xml.Name{"http://www.w3.org/2001/XMLSchema-instance", "type"}, "xsd:string"},
    })

    buf := new(bytes.Buffer)
    buf.WriteString(`<?xml version="1.0" encoding="utf-8"?>`)
    buf.WriteByte('\n')
    enc := x.NewEncoder(buf)
    env := &Envelope{Body{MethodCall{
        One: "one",
        Two: "two",
    }}}
    if err := enc.Encode(env); err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%s\n\n", buf.Bytes())

    dec := x.NewDecoder(bytes.NewBufferString(`<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope>
    <soap:Body>
        <MethodCallResponse>
            <Three>three</Three>
        </MethodCallResponse>
    </soap:Body>
</soap:Envelope>`))
    var resp MethodCallResponse
    if err := dec.DecodeElement(&resp); err != nil {
        log.Fatal(err)
    }
    fmt.Printf("%#v\n\n", resp)
}

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