2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2018 Huawei Technologies Co., Ltd. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
21 package org.onap.ccsdk.sli.plugins.yangserializers.dfserializer;
23 import static javax.xml.transform.OutputKeys.INDENT;
24 import static org.onap.ccsdk.sli.plugins.yangserializers.dfserializer.XmlNodeType.OBJECT_NODE;
25 import static org.onap.ccsdk.sli.plugins.yangserializers.dfserializer.XmlNodeType.TEXT_NODE;
26 import static org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.MdsalPropertiesNodeUtils.getRevision;
27 import java.io.IOException;
28 import java.io.StringReader;
29 import java.io.StringWriter;
30 import java.io.Writer;
32 import java.net.URISyntaxException;
33 import java.util.Iterator;
35 import javax.xml.XMLConstants;
36 import javax.xml.parsers.DocumentBuilder;
37 import javax.xml.parsers.DocumentBuilderFactory;
38 import javax.xml.parsers.ParserConfigurationException;
39 import javax.xml.transform.Transformer;
40 import javax.xml.transform.TransformerException;
41 import javax.xml.transform.TransformerFactory;
42 import javax.xml.transform.dom.DOMSource;
43 import javax.xml.transform.stream.StreamResult;
44 import org.dom4j.Element;
45 import org.onap.ccsdk.sli.core.sli.SvcLogicException;
46 import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.Namespace;
47 import org.onap.ccsdk.sli.plugins.yangserializers.pnserializer.PropertiesNode;
48 import org.opendaylight.yangtools.yang.common.XMLNamespace;
49 import org.opendaylight.yangtools.yang.model.api.Module;
50 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
51 import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
52 import org.w3c.dom.Document;
53 import org.xml.sax.InputSource;
54 import org.xml.sax.SAXException;
57 * Utilities for data format serializer.
59 public final class DfSerializerUtil {
61 static final String JSON_WRITE_ERR = "Unable to write to JSON from " +
64 static final String NODE_TYPE_ERR = "The node type %s is not supported.";
66 static final String JSON_LIS_ERR = "The JSON serializer doesn't have " +
69 static final String XML_LIS_ERR = "The XML serializer doesn't have XML " +
72 static final String PROP_NODE_ERR = "The property node doesn't have " +
73 "schema node bound to it.";
75 static final String DF_ERR = "Type mismatch for the node %s. The schema " +
76 "node does not match with the data format node type %s.";
78 static final String XML_PREFIX = "yangid";
80 private static final String YES = "yes";
82 private static final String INDENT_XMLNS = "{http://xml.apache" +
83 ".org/xslt}indent-amount";
85 private static final String XML_PARSE_ERR = "Unable to parse the xml to " +
88 private static final String URI_ERR = "Unable to parse the URI";
91 * Data format error message for unsupported types.
93 public static final String FORMAT_ERR = "Only JSON and XML formats are " +
94 "supported. %s is not supported";
97 * UTF header message for XML data format message.
99 public static final String UTF_HEADER = "<?xml version=\"1.0\" " +
100 "encoding=\"UTF-8\"?>";
103 * Error message when a JSON tree creation fails.
105 public static final String JSON_TREE_ERR = "Unable to form JSON tree " +
106 "object from the JSON body provided.";
109 * Error message when a XML tree creation fails.
111 public static final String XML_TREE_ERR = "Unable to form XML tree object" +
112 " from the XML body provided.";
115 private DfSerializerUtil() {
119 * Returns the writer which contains the pretty formatted XML string.
121 * @param input input XML
122 * @param indent indentation level
123 * @return writer with XML
124 * @throws SvcLogicException when transformation of source fails
126 public static Writer getXmlWriter(String input, String indent)
127 throws SvcLogicException {
129 TransformerFactory factory = javax.xml.transform.TransformerFactory.newInstance();
130 // Remediate XML external entity vulnerabilty - prohibit the use of all protocols by external entities:
131 factory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
132 factory.setAttribute(XMLConstants.ACCESS_EXTERNAL_STYLESHEET, "");
133 Transformer transformer = factory.newTransformer();
134 transformer.setOutputProperty(INDENT, YES);
135 transformer.setOutputProperty(INDENT_XMLNS, indent);
136 StreamResult result = new StreamResult(new StringWriter());
137 DOMSource source = new DOMSource(parseXml(input));
138 transformer.transform(source, result);
139 return result.getWriter();
140 } catch (TransformerException e) {
141 throw new SvcLogicException(XML_PARSE_ERR + input, e);
146 * Parses the XML and converts it into dom document which can be used for
147 * formatting the XML.
149 * @param in input XML
150 * @return dom document of XML
151 * @throws SvcLogicException when document building fails
153 private static Document parseXml(String in) throws SvcLogicException {
154 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
157 // To remediate XML external entity vulnerability, completely disable external entities declarations:
158 dbf.setFeature("http://xml.org/sax/features/external-general-entities", false);
159 dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
160 DocumentBuilder db = dbf.newDocumentBuilder();
161 InputSource is = new InputSource(new StringReader(in));
163 } catch (SAXException | IOException | ParserConfigurationException e) {
164 throw new SvcLogicException(XML_PARSE_ERR + in, e);
169 * Returns the resolved namespace object from the input received from the
170 * abstract data format.
172 * @param mName module name
173 * @param mUri module URI
174 * @param ctx schema context
175 * @param parent parent properties node
177 * @throws SvcLogicException when resolving namespace fails
179 static Namespace getResolvedNamespace(String mName, String mUri,
181 PropertiesNode parent)
182 throws SvcLogicException {
183 if (mName == null && mUri == null) {
184 Namespace parentNs = parent.namespace();
185 return new Namespace(parentNs.moduleName(), parentNs.moduleNs(),
186 parentNs.revision());
189 Iterator<? extends Module> it;
192 it = ctx.findModules(mName).iterator();
195 it = ctx.findModules(XMLNamespace.of(mUri)).iterator();
203 return new Namespace(mod.getName(), mod.getQNameModule().getNamespace(),
204 getRevision(mod.getRevision()));
208 * Returns the node type of a XML element.
210 * @param element XML element
211 * @return node type of the XML element
213 static XmlNodeType getXmlNodeType(Element element) {
214 Element newElement = element.createCopy();
215 newElement.remove(element.getNamespace());
216 return newElement.hasContent() && newElement.isTextOnly() ?
217 TEXT_NODE : OBJECT_NODE;
221 * Resolves the super type to the base type from type definition.
223 * @param type super type
224 * @return base type definition
226 static TypeDefinition<?> resolveBaseTypeFrom(TypeDefinition<?> type) {
227 TypeDefinition superType = type;
228 while (superType.getBaseType() != null) {
229 superType = superType.getBaseType();