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/*
* This file is part of LibEuFin.
* Copyright (C) 2020, 2024 Taler Systems S.A.
*
* LibEuFin is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation; either version 3, or
* (at your option) any later version.
*
* LibEuFin is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General
* Public License for more details.
*
* You should have received a copy of the GNU Affero General Public
* License along with LibEuFin; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>
*/
package tech.libeufin.nexus
import org.w3c.dom.*
import java.io.InputStream
import java.io.StringWriter
import java.time.LocalDate
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter
import javax.xml.parsers.*
import javax.xml.stream.XMLOutputFactory
import javax.xml.stream.XMLStreamWriter
interface XmlBuilder {
fun el(path: String, lambda: XmlBuilder.() -> Unit = {})
fun el(path: String, content: String) {
el(path) {
text(content)
}
}
fun attr(namespace: String, name: String, value: String)
fun attr(name: String, value: String)
fun text(content: String)
companion object {
fun toBytes(root: String, f: XmlBuilder.() -> Unit): ByteArray {
val factory = XMLOutputFactory.newFactory()
val stream = StringWriter()
var writer = factory.createXMLStreamWriter(stream)
/**
* NOTE: commenting out because it wasn't obvious how to output the
* "standalone = 'yes' directive". Manual forge was therefore preferred.
*/
stream.write("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>")
XmlStreamBuilder(writer).el(root) {
this.f()
}
writer.writeEndDocument()
return stream.buffer.toString().toByteArray()
}
fun toDom(root: String, schema: String?, f: XmlBuilder.() -> Unit): Document {
val factory = DocumentBuilderFactory.newInstance();
factory.isNamespaceAware = true
val builder = factory.newDocumentBuilder();
val doc = builder.newDocument();
doc.setXmlVersion("1.0")
doc.setXmlStandalone(true)
val root = doc.createElementNS(schema, root)
doc.appendChild(root);
XmlDOMBuilder(doc, schema, root).f()
doc.normalize()
return doc
}
}
}
private class XmlStreamBuilder(private val w: XMLStreamWriter): XmlBuilder {
override fun el(path: String, lambda: XmlBuilder.() -> Unit) {
path.splitToSequence('/').forEach {
w.writeStartElement(it)
}
lambda()
path.splitToSequence('/').forEach {
w.writeEndElement()
}
}
override fun attr(namespace: String, name: String, value: String) {
w.writeAttribute(namespace, name, value)
}
override fun attr(name: String, value: String) {
w.writeAttribute(name, value)
}
override fun text(content: String) {
w.writeCharacters(content)
}
}
private class XmlDOMBuilder(private val doc: Document, private val schema: String?, private var node: Element): XmlBuilder {
override fun el(path: String, lambda: XmlBuilder.() -> Unit) {
val current = node
path.splitToSequence('/').forEach {
val new = doc.createElementNS(schema, it)
node.appendChild(new)
node = new
}
lambda()
node = current
}
override fun attr(namespace: String, name: String, value: String) {
node.setAttributeNS(namespace, name, value)
}
override fun attr(name: String, value: String) {
node.setAttribute(name, value)
}
override fun text(content: String) {
node.appendChild(doc.createTextNode(content));
}
}
class DestructionError(m: String) : Exception(m)
private fun Element.childrenByTag(tag: String): Sequence<Element> = sequence {
for (i in 0..childNodes.length) {
val el = childNodes.item(i)
if (el !is Element) {
continue
}
if (el.localName != tag) {
continue
}
yield(el)
}
}
class XmlDestructor internal constructor(private val el: Element) {
fun each(path: String, f: XmlDestructor.() -> Unit) {
el.childrenByTag(path).forEach {
f(XmlDestructor(it))
}
}
fun <T> map(path: String, f: XmlDestructor.() -> T): List<T> {
return el.childrenByTag(path).map {
f(XmlDestructor(it))
}.toList()
}
fun one(path: String): XmlDestructor {
val children = el.childrenByTag(path).iterator()
if (!children.hasNext()) {
throw DestructionError("expected a single $path child, got none instead at $el")
}
val el = children.next()
if (children.hasNext()) {
throw DestructionError("expected a single $path child, got ${children.asSequence() + 1} instead at $el")
}
return XmlDestructor(el)
}
fun opt(path: String): XmlDestructor? {
val children = el.childrenByTag(path).iterator()
if (!children.hasNext()) {
return null
}
val el = children.next()
if (children.hasNext()) {
throw DestructionError("expected an optional $path child, got ${children.asSequence().count() + 1} instead at $el")
}
return XmlDestructor(el)
}
fun <T> one(path: String, f: XmlDestructor.() -> T): T = f(one(path))
fun <T> opt(path: String, f: XmlDestructor.() -> T): T? = opt(path)?.run(f)
fun text(): String = el.textContent
fun bool(): Boolean = el.textContent.toBoolean()
fun date(): LocalDate = LocalDate.parse(text(), DateTimeFormatter.ISO_DATE)
fun dateTime(): LocalDateTime = LocalDateTime.parse(text(), DateTimeFormatter.ISO_DATE_TIME)
inline fun <reified T : Enum<T>> enum(): T = java.lang.Enum.valueOf(T::class.java, text())
fun attr(index: String): String = el.getAttribute(index)
companion object {
fun <T> fromStream(xml: InputStream, root: String, f: XmlDestructor.() -> T): T {
val doc = XMLUtil.parseIntoDom(xml)
return fromDoc(doc, root, f)
}
fun <T> fromDoc(doc: Document, root: String, f: XmlDestructor.() -> T): T {
if (doc.documentElement.tagName != root) {
throw DestructionError("expected root '$root' got '${doc.documentElement.tagName}'")
}
val destr = XmlDestructor(doc.documentElement)
return f(destr)
}
}
}
fun <T> destructXml(xml: InputStream, root: String, f: XmlDestructor.() -> T): T
= XmlDestructor.fromStream(xml, root, f)
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