nowhere near usable but setting aside for rainy day

2021-07-04 04:06:05 -04:00
parent 5e9399497b
commit 9d59974e5a
6 changed files with 178 additions and 127 deletions
--- a/func_nsxml.go
+++ b/func_nsxml.go
@@ -0,0 +1,128 @@
+package main
+
+import (
+	"io/ioutil"
+	"net/http"
+	"strings"
+
+	lxml "github.com/lestrrat-go/libxml2"
+	lxmlp "github.com/lestrrat-go/libxml2/parser"
+	lxmlt "github.com/lestrrat-go/libxml2/types"
+	"github.com/lestrrat-go/libxml2/xsd"
+	rpaths "r00t2.io/sysutils/paths"
+)
+
+func NewNsXml(raw *[]byte) (x *NsXml, err error) {
+
+	var xml NsXml
+
+	xml.Raw = raw
+
+	x = &xml
+
+	return
+}
+
+func (x *NsXml) Validate(defaults bool) (bool, error) {
+	// We need the XSD before we can validate.
+	if err := x.getXSD(); err != nil {
+		return false, err
+	}
+
+	return false, nil
+}
+
+func (x *NsXml) getXSD() error {
+	if err := x.mapNS(); err != nil {
+		return err
+	}
+	r := uriRe.FindStringSubmatch(strings.ToLower(x.XSD.XSDPath))
+	reResults := make(map[string]string)
+	for i, name := range uriRe.SubexpNames() {
+		if i != 0 && name != "" {
+			reResults[name] = r[i]
+		}
+	}
+	var xsdRaw []byte
+	switch reResults["type"] {
+	case "file":
+		p := reResults["path"]
+		exists, err := rpaths.RealPathExists(&p)
+		if (err != nil) || (!exists) {
+			return err
+		}
+		xsdRaw, err = ioutil.ReadFile(p)
+		if err != nil {
+			return err
+		}
+	case "http", "https":
+		resp, err := http.Get(x.XSD.XSDPath)
+		if err != nil {
+			return err
+		}
+		defer resp.Body.Close()
+		xsdRaw, err = ioutil.ReadAll(resp.Body)
+		if err != nil {
+			return err
+		}
+	default:
+		return errors.New("invalid URI type for schemaLocation")
+	}
+	x.XSD, err = xsd.Parse(xsdRaw)
+	if err != nil {
+		return err
+	}
+}
+
+// mapNS (tries to) extract the default namespace from the document via the SchemaLocation property of XML, sets DefaultNS,
+// and then gets the XSDPath specified therein.
+func (x *NsXml) mapNS() error {
+	if x.XSD.Pointer() != 0 {
+		// Already set.
+		return nil
+	}
+	if err := x.parse(); err != nil {
+		return err
+	}
+
+	x.DefaultNS = x.Root.NamespaceURI()
+	/* x.DefaultNS = *x.XML.XMLName.Space
+	sl := *x.XML.SchemaLocation
+	*/
+	ns := strings.Fields(sl)
+	if ns != nil {
+		if len(ns) > 2 {
+			return errors.New("too many values for a valid schemaLocation")
+		} else if len(ns) == 0 {
+			return errors.New("no specified value for schemaLocation")
+		} else if len(ns) == 1 {
+			// LAZY. This is improper XML, but is commonly used regardless.
+			x.XSDPath = ns[0]
+		} else {
+			if ns[0] == x.DefaultNS {
+				x.XSDPath = ns[1]
+			}
+		}
+	}
+	return nil
+}
+
+// parse parses the x.XML into its x.LXML
+func (x *NsXml) parse() error {
+	if x.LXML != nil {
+		return nil // Already parsed
+	}
+	if x.XML == nil {
+		return errors.New("XML property is empty")
+	}
+	x.LXML, err = lxml.Parse(*x.XML, lxmlp.XMLParseBigLines, lxmlp.XMLParseXInclude)
+	if err != nil {
+		return err
+	}
+	de, err := x.LXML.DocumentElement()
+	if err != nil {
+		return err
+	}
+	x.Root = de.(lxmlt.Element)
+	return nil
+}