com.googlesource.gerrit.plugins.manifest.ManifestXml.java Source code

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Here is the source code for com.googlesource.gerrit.plugins.manifest.ManifestXml.java

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// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.googlesource.gerrit.plugins.manifest;

import org.jdom2.Document;
import org.jdom2.JDOMFactory;
import org.jdom2.input.SAXBuilder;
import org.jdom2.JDOMException;
import org.jdom2.input.sax.SAXHandler;
import org.jdom2.input.sax.SAXHandlerFactory;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import javax.xml.parsers.ParserConfigurationException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.UUID;

/** Some xml parsing routines tuned for our manifests */
public class ManifestXml {
    private Document doc;
    private ArrayList<DTDAttribute> dtdAttributes = new ArrayList<>();
    private String replacementText;

    public ManifestXml(String xml) throws IOException, ParserConfigurationException, SAXException, JDOMException {
        // Insert a unique identifier for entity definitions to prevent them from
        // getting expanded during the parse
        genReplacementText(xml);
        xml = xml.replaceAll("&([^;]*);", replacementText + "$1;");

        SAXBuilder builder = new SAXBuilder();
        builder.setSAXHandlerFactory(new SAXHandlerFactory() {
            @Override
            public SAXHandler createSAXHandler(JDOMFactory jdomFactory) {
                return new SAXHandler() {
                    @Override
                    public void attributeDecl(String eName, String aName, String type, String valueDefault,
                            String value) {
                        dtdAttributes.add(new DTDAttribute(eName, aName, type, valueDefault, value));
                        super.attributeDecl(eName, aName, type, valueDefault, value);
                    }
                };
            }
        });
        builder.setExpandEntities(false);
        doc = builder.build(new InputSource(new StringReader(xml)));
    }

    public Document getDocument() {
        return doc;
    }

    public String getManifestText() throws IOException {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        printDocument(stream);
        return stream.toString().replaceAll(replacementText, "&");
    }

    private void printDocument(OutputStream out) throws IOException {
        XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat());
        outputter.setXMLOutputProcessor(new CustomOutputter(dtdAttributes));

        outputter.output(doc, out);
    }

    private void genReplacementText(String xml) {
        String uuid = UUID.randomUUID().toString();
        while (xml.contains(uuid)) {
            uuid = UUID.randomUUID().toString();
        }
        replacementText = uuid;
    }
}