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/*

plist - An open source library to parse and generate property lists
Copyright (C) 2014 Daniel Dreibrodt
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE. */ package com.dd.plist;

import org.w3c.dom.*; import org.xml.sax.EntityResolver; import org.xml.sax.InputSource; import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import java.io.*; import java.text.ParseException; import java.util.ArrayList; import java.util.List;

/**

Parses XML property lists.
@author Daniel Dreibrodt */ public class XMLPropertyListParser { private static final DocumentBuilderFactory FACTORY = DocumentBuilderFactory.newInstance();

static { // // Attempt to disable parser features that can lead to XXE exploits; see: // https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Prevention_Cheat_Sheet#Java // try { FACTORY.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false); } catch (ParserConfigurationException ignored) { }
```
 try {
     FACTORY.setFeature("http://xml.org/sax/features/external-general-entities", false);
 } catch (ParserConfigurationException ignored) {
 }

 try {
     FACTORY.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
 } catch (ParserConfigurationException ignored) {
 }

 try {
     FACTORY.setXIncludeAware(false);
 } catch (UnsupportedOperationException ignored) {
 }

 FACTORY.setExpandEntityReferences(false);
 FACTORY.setNamespaceAware(false);
 FACTORY.setIgnoringComments(true);
 FACTORY.setCoalescing(true);
 FACTORY.setValidating(false);
```
}

/**
- Gets a {@link DocumentBuilder} to parse a XML property list.
- As {@link DocumentBuilder} instance are not thread-safe a new {@link DocumentBuilder} is generated for each request.
- @return A new {@link DocumentBuilder} that can parse property lists without an internet connection.
- @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
- ```
                                                   could not be created. This should not occur.
```
*/ public static DocumentBuilder getDocBuilder() throws ParserConfigurationException { DocumentBuilder builder = FACTORY.newDocumentBuilder(); builder.setEntityResolver(new PlistDtdResolver()); return builder; }

/**
- Parses a XML property list file.
- @param f The XML property list file.
- @return The root object of the property list. This is usually a {@link NSDictionary} but can also be a {@link NSArray}.
- @see javax.xml.parsers.DocumentBuilder#parse(java.io.File)
- @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
- ```
                                                   could not be created. This should not occur.
```
- @throws java.io.IOException If any I/O error occurs while reading the file.
- @throws org.xml.sax.SAXException If any parse error occurs.
- @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
- @throws java.text.ParseException If a date string could not be parsed. */ public static NSObject parse(File f) throws ParserConfigurationException, IOException, SAXException, PropertyListFormatException, ParseException { InputStream fileInputStream = new FileInputStream(f); try { return parse(getDocBuilder().parse(fileInputStream)); } finally { try { fileInputStream.close(); } catch (IOException e) { // ignore } } }
/**
- Parses a XML property list from a byte array.
- @param bytes The byte array containing the property list's data.
- @return The root object of the property list. This is usually a {@link NSDictionary} but can also be a {@link NSArray}.
- @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
- ```
                                                   could not be created. This should not occur.
```
- @throws java.io.IOException If any I/O error occurs while reading the file.
- @throws org.xml.sax.SAXException If any parse error occurs.
- @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
- @throws java.text.ParseException If a date string could not be parsed. */ public static NSObject parse(final byte[] bytes) throws ParserConfigurationException, ParseException, SAXException, PropertyListFormatException, IOException { InputStream inputStream = new ByteArrayInputStream(bytes); try { return parse(getDocBuilder().parse(inputStream)); } finally { try { inputStream.close(); } catch (IOException e) { // ignore } } }
/**
- Parses a XML property list from an input stream.
- This method does not close the specified input stream.
- @param is The input stream pointing to the property list's data.
- @return The root object of the property list. This is usually a {@link NSDictionary} but can also be a {@link NSArray}.
- @see javax.xml.parsers.DocumentBuilder#parse(java.io.InputStream)
- @throws javax.xml.parsers.ParserConfigurationException If a document builder for parsing a XML property list
- ```
                                                   could not be created. This should not occur.
```
- @throws java.io.IOException If any I/O error occurs while reading the file.
- @throws org.xml.sax.SAXException If any parse error occurs.
- @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
- @throws java.text.ParseException If a date string could not be parsed. */ public static NSObject parse(InputStream is) throws ParserConfigurationException, IOException, SAXException, PropertyListFormatException, ParseException { InputStream filteredInputStream = new FilterInputStream(is) { @Override public void close() {} }; return parse(getDocBuilder().parse(filteredInputStream)); }
/**
- Parses a property list from an XML document.
- @param doc The XML document.
- @return The root NSObject of the property list contained in the XML document.
- @throws java.io.IOException If any I/O error occurs while reading the file.
- @throws com.dd.plist.PropertyListFormatException If the given property list has an invalid format.
- @throws java.text.ParseException If a date string could not be parsed. */ public static NSObject parse(Document doc) throws PropertyListFormatException, IOException, ParseException { DocumentType docType = doc.getDoctype(); if (docType == null) { if (!doc.getDocumentElement().getNodeName().equals("plist")) { throw new UnsupportedOperationException("The given XML document is not a property list."); } } else if (!docType.getName().equals("plist")) { throw new UnsupportedOperationException("The given XML document is not a property list."); }
  
  Node rootNode;
  
  if (doc.getDocumentElement().getNodeName().equals("plist")) { //Root element wrapped in plist tag List rootNodes = filterElementNodes(doc.getDocumentElement().getChildNodes()); if (rootNodes.isEmpty()) { throw new PropertyListFormatException("The given XML property list has no root element!"); } else if (rootNodes.size() == 1) { rootNode = rootNodes.get(0); } else { throw new PropertyListFormatException("The given XML property list has more than one root element!"); } } else { //Root NSObject not wrapped in plist-tag rootNode = doc.getDocumentElement(); }
  
  return parseObject(rootNode); }
/**
- Parses a node in the XML structure and returns the corresponding NSObject
- @param n The XML node.
- @return The corresponding NSObject.
- @throws java.io.IOException If any I/O error occurs while parsing a Base64 encoded NSData object.
- @throws java.text.ParseException If a date string could not be parsed. */ private static NSObject parseObject(Node n) throws ParseException, IOException { String type = n.getNodeName(); if (type.equals("dict")) { NSDictionary dict = new NSDictionary(); List children = filterElementNodes(n.getChildNodes()); for (int i = 0; i < children.size(); i += 2) { Node key = children.get(i); Node val = children.get(i + 1);
```
     String keyString = getNodeTextContents(key);

     dict.put(keyString, parseObject(val));
 }
 return dict;
```
  } else if (type.equals("array")) { List children = filterElementNodes(n.getChildNodes()); NSArray array = new NSArray(children.size()); for (int i = 0; i < children.size(); i++) { array.setValue(i, parseObject(children.get(i))); } return array; } else if (type.equals("true")) { return new NSNumber(true); } else if (type.equals("false")) { return new NSNumber(false); } else if (type.equals("integer")) { return new NSNumber(getNodeTextContents(n)); } else if (type.equals("real")) { return new NSNumber(getNodeTextContents(n)); } else if (type.equals("string")) { return new NSString(getNodeTextContents(n)); } else if (type.equals("data")) { return new NSData(getNodeTextContents(n)); } else if (type.equals("date")) { return new NSDate(getNodeTextContents(n)); } return null; }
/**
- Returns all element nodes that are contained in a list of nodes.
- @param list The list of nodes to search.
- @return The sub-list containing only nodes representing actual elements. */ private static List filterElementNodes(NodeList list) { List result = new ArrayList(list.getLength()); for (int i = 0; i < list.getLength(); i++) { if (list.item(i).getNodeType() == Node.ELEMENT_NODE) { result.add(list.item(i)); } } return result; }
/**
- Returns a node's text content.
- This method will return the text value represented by the node's direct children.
- If the given node is a TEXT or CDATA node, then its value is returned.
- @param n The node.
- @return The node's text content. */ private static String getNodeTextContents(Node n) { if (n.getNodeType() == Node.TEXT_NODE || n.getNodeType() == Node.CDATA_SECTION_NODE) { Text txtNode = (Text) n; String content = txtNode.getWholeText(); //This concatenates any adjacent text/cdata/entity nodes if (content == null) return ""; else return content; } else { if (n.hasChildNodes()) { NodeList children = n.getChildNodes();
```
     for (int i = 0; i < children.getLength(); i++) {
         //Skip any non-text nodes, like comments or entities
         Node child = children.item(i);
         if (child.getNodeType() == Node.TEXT_NODE || child.getNodeType() == Node.CDATA_SECTION_NODE) {
             Text txtNode = (Text) child;
             String content = txtNode.getWholeText(); //This concatenates any adjacent text/cdata/entity nodes
             if (content == null)
                 return "";
             else
                 return content;
         }
     }

     return "";
 } else {
     return "";
 }
```
  } }
/**
- Offline resolver for Apple's PLIST DTDs. */ private static class PlistDtdResolver implements EntityResolver { private static final String PLIST_PUBLIC_ID_1 = "-//Apple Computer//DTD PLIST 1.0//EN"; private static final String PLIST_PUBLIC_ID_2 = "-//Apple//DTD PLIST 1.0//EN";
  
  PlistDtdResolver() { }
  
  /**
  - Allow the application to resolve external entities.
  - This specific implementation returns an empty definition for Apple's PLIST DTDs
  - so that parsing can happen offline.
  - @param publicId The public identifier of the external entity being referenced, or null if none was supplied.
  - @param systemId The system identifier of the external entity being referenced.
  - @return An empty input source for the PLIST DTDs. For all other DTDs null is returned. */ public InputSource resolveEntity(String publicId, String systemId) { if (PLIST_PUBLIC_ID_1.equals(publicId) || PLIST_PUBLIC_ID_2.equals(publicId)) { return new InputSource(new ByteArrayInputStream(new byte[0])); } return null; } }

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