// ApplyMods changes a SAML message by applying an array of xpath expressions and a value
// If the value is "" the nodes are unlinked
// if the value starts with "+ " the the node content is prefixed with the rest of the value
// Otherwise the node content is replaced with the value
func ApplyMods(xp *gosaml.Xp, m mods) {
//log.Printf("%+v\n", m)
//log.Println(xp.X2s())
for _, change := range m {
if change.value == "" {
//log.Printf("changeval: '%s'\n", change.value)
for _, element := range xp.Query(nil, change.path) {
//log.Printf("unlink: %s\n", change.path)
xp.UnlinkNode(element)
}
} else if strings.HasPrefix(change.value, "+ ") {
for _, element := range xp.Query(nil, change.path) {
value := xp.NodeGetContent(element)
xp.NodeSetContent(element, strings.Fields(change.value)[1]+value)
}
} else {
xp.QueryDashP(nil, change.path, change.value, nil)
}
}
//log.Println(xp.X2s())
}
