c0sco / go-xsd-validate

Xsd validation for go based on libxml2

xsdvalidate

The main goal of this package is to preload xsd files into memory and use the associated libxml2 structures to validate xml documents in a multithreaded environment, eg. the post bodys of xml service endpoints and hand through libxml2 error messages. Similar packages I found on github either didn't provide error details or got stuck under load. As a side effect the parser errors (if set to verbose) can also provide useful information about malformed xml input.

Api Reference

https://godoc.org/github.com/terminalstatic/go-xsd-validate

Install

libxml2-dev is needed, below an example how to install the latest sources as at the time of writing (Ubuntu, change prefix according to where libs and include files are located):

curl -sL ftp://xmlsoft.org/libxml2/libxml2-2.9.7.tar.gz| tar -xzf -
cd ./libxml2-2.9.7/
./configure --prefix=/usr  --enable-static --with-threads --with-history
make
sudo make install

Go get the package:

go get github.com/terminalstatic/go-xsd-validate

Examples

Check this for a simple http server example and that for an even simpler one.

xsdvalidate.Init()
defer xsdvalidate.Cleanup()
xsdhandler, err := xsdvalidate.NewXsdHandlerUrl("examples/test1_split.xsd", xsdvalidate.ParsErrDefault)
if err != nil {
	panic(err)
}
defer xsdhandler.Free()

xmlFile, err := os.Open("examples/test1_fail2.xml")
if err != nil {
	panic(err)
}
defer xmlFile.Close()
inXml, err := ioutil.ReadAll(xmlFile)
if err != nil {
	panic(err)
}

// Option 1:
xmlhandler, err := xsdvalidate.NewXmlHandlerMem(inXml, xsdvalidate.ParsErrDefault)
if err != nil {
	panic(err)
}
defer xmlhandler.Free()

err = xsdhandler.Validate(xmlhandler, xsdvalidate.ValidErrDefault)
if err != nil {
	switch err.(type) {
	case xsdvalidate.ValidationError:
		fmt.Println(err)
		fmt.Printf("Error in line: %d\n", err.(xsdvalidate.ValidationError).Errors[0].Line)
		fmt.Println(err.(xsdvalidate.ValidationError).Errors[0].Message)
	default:
		fmt.Println(err)
	}
}

// Option 2:
err = xsdhandler.ValidateMem(inXml, xsdvalidate.ValidErrDefault)
if err != nil {
	switch err.(type) {
	case xsdvalidate.ValidationError:
		fmt.Println(err)
		fmt.Printf("Error in line: %d\n", err.(xsdvalidate.ValidationError).Errors[0].Line)
		fmt.Println(err.(xsdvalidate.ValidationError).Errors[0].Message)
	default:
		fmt.Println(err)
	}
}

Licence

MIT