func getReferencedXML(reference *etree.Element, inputDoc *etree.Document) (outputDoc *etree.Document, err error) {
uri := reference.SelectAttrValue("URI", "")
uri = strings.Replace(uri, "#", "", 1)
// populate doc with the referenced xml from the Reference URI
if uri == "" {
outputDoc = inputDoc
} else {
path := fmt.Sprintf(".//[@ID='%s']", uri)
e := inputDoc.FindElement(path)
if e != nil {
outputDoc = etree.NewDocument()
outputDoc.SetRoot(e.Copy())
} else {
// SAML v1.1 Assertions use AssertionID
path := fmt.Sprintf(".//[@AssertionID='%s']", uri)
e := inputDoc.FindElement(path)
if e != nil {
outputDoc = etree.NewDocument()
outputDoc.SetRoot(e.Copy())
}
}
}
if outputDoc == nil {
return nil, errors.New("signedxml: unable to find refereced xml")
}
return outputDoc, nil
}
func processTransform(transform *etree.Element,
docIn *etree.Document) (docOut *etree.Document, err error) {
transformAlgoURI := transform.SelectAttrValue("Algorithm", "")
if transformAlgoURI == "" {
return nil, errors.New("signedxml: unable to find Algorithm in Transform")
}
transformAlgo, ok := CanonicalizationAlgorithms[transformAlgoURI]
if !ok {
return nil, fmt.Errorf("signedxml: unable to find matching transform"+
"algorithm for %s in CanonicalizationAlgorithms", transformAlgoURI)
}
var transformContent string
if transform.ChildElements() != nil {
tDoc := etree.NewDocument()
tDoc.SetRoot(transform.Copy())
transformContent, err = tDoc.WriteToString()
if err != nil {
return nil, err
}
}
docString, err := docIn.WriteToString()
if err != nil {
return nil, err
}
docString, err = transformAlgo.Process(docString, transformContent)
if err != nil {
return nil, err
}
docOut = etree.NewDocument()
docOut.ReadFromString(docString)
return docOut, nil
}
func (e ExclusiveCanonicalization) renderAttributes(node *etree.Element,
prefixesInScope []string, defaultNS string) (newDefaultNS string,
newPrefixesInScope []string) {
currentNS := node.SelectAttrValue("xmlns", defaultNS)
elementAttributes := []etree.Attr{}
nsListToRender := make(map[string]string)
attrListToRender := attributes{}
// load map with for prefix -> uri lookup
for _, attr := range node.Attr {
if attr.Space == "xmlns" {
e.namespaces[attr.Key] = attr.Value
}
}
// handle the namespace of the node itself
if node.Space != "" {
if !contains(prefixesInScope, node.Space) {
nsListToRender["xmlns:"+node.Space] = e.namespaces[node.Space]
prefixesInScope = append(prefixesInScope, node.Space)
}
} else if defaultNS != currentNS {
newDefaultNS = currentNS
elementAttributes = append(elementAttributes,
etree.Attr{Key: "xmlns", Value: currentNS})
}
for _, attr := range node.Attr {
// include the namespaces if they are in the inclusiveNamespacePrefixList
if attr.Space == "xmlns" {
if !contains(prefixesInScope, attr.Key) &&
contains(e.inclusiveNamespacePrefixList, attr.Key) {
nsListToRender["xmlns:"+attr.Key] = attr.Value
prefixesInScope = append(prefixesInScope, attr.Key)
}
}
// include namespaces for qualfied attributes
if attr.Space != "" &&
attr.Space != "xmlns" &&
!contains(prefixesInScope, attr.Space) {
nsListToRender["xmlns:"+attr.Space] = e.namespaces[attr.Space]
prefixesInScope = append(prefixesInScope, attr.Space)
}
// inclued all non-namespace attributes
if attr.Space != "xmlns" && attr.Key != "xmlns" {
attrListToRender = append(attrListToRender,
attribute{
prefix: attr.Space,
uri: e.namespaces[attr.Space],
key: attr.Key,
value: attr.Value,
})
}
}
// sort and add the namespace attributes first
sortedNSList := getSortedNamespaces(nsListToRender)
elementAttributes = append(elementAttributes, sortedNSList...)
// then sort and add the non-namespace attributes
sortedAttributes := getSortedAttributes(attrListToRender)
elementAttributes = append(elementAttributes, sortedAttributes...)
// replace the nodes attributes with the sorted copy
node.Attr = elementAttributes
return currentNS, prefixesInScope
}