2 * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
3 * Copyright (c) 2023 PANTHEON.tech, s.r.o.
5 * This program and the accompanying materials are made available under the
6 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
7 * and is available at http://www.eclipse.org/legal/epl-v10.html
9 package org.opendaylight.restconf.nb.rfc8040.databind;
11 import com.google.common.collect.ImmutableList;
12 import java.io.IOException;
13 import java.io.InputStream;
14 import java.net.URISyntaxException;
15 import java.util.ArrayList;
16 import java.util.List;
17 import javax.xml.stream.XMLStreamException;
18 import javax.xml.transform.dom.DOMSource;
19 import org.eclipse.jdt.annotation.NonNull;
20 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
21 import org.opendaylight.restconf.common.patch.PatchContext;
22 import org.opendaylight.restconf.common.patch.PatchEntity;
23 import org.opendaylight.restconf.server.api.DataPatchPath;
24 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.patch.rev170222.yang.patch.yang.patch.Edit.Operation;
25 import org.opendaylight.yangtools.util.xml.UntrustedXML;
26 import org.opendaylight.yangtools.yang.common.ErrorTag;
27 import org.opendaylight.yangtools.yang.common.ErrorType;
28 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
29 import org.opendaylight.yangtools.yang.data.codec.xml.XmlParserStream;
30 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNormalizedNodeStreamWriter;
31 import org.opendaylight.yangtools.yang.data.impl.schema.NormalizationResultHolder;
32 import org.slf4j.Logger;
33 import org.slf4j.LoggerFactory;
34 import org.w3c.dom.Document;
35 import org.w3c.dom.Element;
36 import org.w3c.dom.Node;
37 import org.xml.sax.SAXException;
39 public final class XmlPatchBody extends PatchBody {
40 private static final Logger LOG = LoggerFactory.getLogger(XmlPatchBody.class);
42 public XmlPatchBody(final InputStream inputStream) {
47 PatchContext toPatchContext(final DataPatchPath path, final InputStream inputStream) throws IOException {
49 return parse(path, UntrustedXML.newDocumentBuilder().parse(inputStream));
50 } catch (XMLStreamException | SAXException | URISyntaxException e) {
51 LOG.debug("Failed to parse YANG Patch XML", e);
52 throw new RestconfDocumentedException("Error parsing YANG Patch XML: " + e.getMessage(), ErrorType.PROTOCOL,
53 ErrorTag.MALFORMED_MESSAGE, e);
57 private static @NonNull PatchContext parse(final DataPatchPath path, final Document doc)
58 throws XMLStreamException, IOException, SAXException, URISyntaxException {
59 final var entities = ImmutableList.<PatchEntity>builder();
60 final var patchId = doc.getElementsByTagName("patch-id").item(0).getFirstChild().getNodeValue();
61 final var editNodes = doc.getElementsByTagName("edit");
62 final var databind = path.databind();
64 for (int i = 0; i < editNodes.getLength(); i++) {
65 final Element element = (Element) editNodes.item(i);
66 final String operation = element.getElementsByTagName("operation").item(0).getFirstChild().getNodeValue();
67 final Operation oper = Operation.ofName(operation);
68 final String editId = element.getElementsByTagName("edit-id").item(0).getFirstChild().getNodeValue();
69 final String target = element.getElementsByTagName("target").item(0).getFirstChild().getNodeValue();
70 final List<Element> values = readValueNodes(element, oper);
71 final Element firstValueElement = values != null ? values.get(0) : null;
73 // find complete path to target, it can be also empty (only slash)
74 final var targetII = parsePatchTarget(path, target);
76 final var lookup = databind.schemaTree().enterPath(targetII).orElseThrow();
78 final var stack = lookup.stack();
79 final var inference = stack.toInference();
80 if (!stack.isEmpty()) {
84 if (requiresValue(oper)) {
85 final var resultHolder = new NormalizationResultHolder();
86 final var writer = ImmutableNormalizedNodeStreamWriter.from(resultHolder);
87 final var xmlParser = XmlParserStream.create(writer, databind.xmlCodecs(), inference);
88 xmlParser.traverse(new DOMSource(firstValueElement));
90 final var result = resultHolder.getResult().data();
91 // for lists allow to manipulate with list items through their parent
92 if (targetII.getLastPathArgument() instanceof NodeIdentifierWithPredicates) {
93 entities.add(new PatchEntity(editId, oper, targetII.getParent(), result));
95 entities.add(new PatchEntity(editId, oper, targetII, result));
98 entities.add(new PatchEntity(editId, oper, targetII));
102 return new PatchContext(patchId, entities.build());
108 * @param element Element of current edit operation
109 * @param operation Name of current operation
110 * @return List of value elements
112 private static List<Element> readValueNodes(final @NonNull Element element, final @NonNull Operation operation) {
113 final Node valueNode = element.getElementsByTagName("value").item(0);
115 final boolean isWithValue = requiresValue(operation);
116 if (isWithValue && valueNode == null) {
117 throw new RestconfDocumentedException("Error parsing input",
118 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
121 if (!isWithValue && valueNode != null) {
122 throw new RestconfDocumentedException("Error parsing input",
123 ErrorType.PROTOCOL, ErrorTag.MALFORMED_MESSAGE);
126 if (valueNode == null) {
130 final var result = new ArrayList<Element>();
131 final var childNodes = valueNode.getChildNodes();
132 for (int i = 0; i < childNodes.getLength(); i++) {
133 if (childNodes.item(i) instanceof Element childElement) {
134 result.add(childElement);