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    • org.exist.extensions.exquery.restxq.impl.RestXqServiceImpl Maven / Gradle / Ivy

    /*
 Copyright (c) 2012, Adam Retter
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 * Neither the name of Adam Retter Consulting nor the
 names of its contributors may be used to endorse or promote products
 derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL Adam Retter BE LIABLE FOR ANY
 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.exist.extensions.exquery.restxq.impl;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.function.Predicate;

import org.apache.commons.io.input.CloseShieldInputStream;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.exist.extensions.exquery.xdm.type.impl.BinaryTypedValue;
import org.exist.extensions.exquery.xdm.type.impl.DocumentTypedValue;
import org.exist.extensions.exquery.xdm.type.impl.StringTypedValue;
import org.exist.dom.memtree.DocumentBuilderReceiver;
import org.exist.dom.memtree.DocumentImpl;
import org.exist.dom.memtree.MemTreeBuilder;
import org.exist.storage.BrokerPool;
import org.exist.util.Configuration;
import org.exist.util.MimeTable;
import org.exist.util.MimeType;
import org.exist.util.io.CachingFilterInputStream;
import org.exist.util.io.FastByteArrayOutputStream;
import org.exist.util.io.FilterInputStreamCache;
import org.exist.util.io.FilterInputStreamCacheFactory;
import org.exist.xquery.XPathException;
import org.exist.xquery.value.Base64BinaryValueType;
import org.exist.xquery.value.BinaryValue;
import org.exist.xquery.value.BinaryValueFromInputStream;
import org.exist.xquery.value.BinaryValueManager;
import org.exist.xquery.value.StringValue;
import org.exquery.http.HttpRequest;
import org.exquery.http.HttpResponse;
import org.exquery.restxq.ResourceFunction;
import org.exquery.restxq.ResourceFunctionExecuter;
import org.exquery.restxq.RestXqErrorCodes;
import org.exquery.restxq.RestXqServiceException;
import org.exquery.restxq.RestXqServiceSerializer;
import org.exquery.restxq.impl.AbstractRestXqService;
import org.exquery.xdm.type.SequenceImpl;
import org.exquery.xquery.Sequence;
import org.exquery.xquery.Type;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;

/**
 *
 * @author Adam Retter
 */
class RestXqServiceImpl extends AbstractRestXqService {

    private final static Logger LOG = LogManager.getLogger(RestXqServiceImpl.class);

    private final BrokerPool brokerPool;
    private final BinaryValueManager binaryValueManager;

    public RestXqServiceImpl(final ResourceFunction resourceFunction, final BrokerPool brokerPool) {
        super(resourceFunction);
        this.brokerPool = brokerPool;
        this.binaryValueManager = new BinaryValueManager() {

            final Deque binaryValues = new ArrayDeque<>();

            @Override
            public void registerBinaryValueInstance(final BinaryValue binaryValue) {
                binaryValues.push(binaryValue);
            }

            @Override
            public void runCleanupTasks(final Predicate predicate) {
                while (!binaryValues.isEmpty()) {
                    try {
                        if(predicate.test(binaryValues.peek())) {
                            final BinaryValue binaryValue = binaryValues.pop();
                            binaryValue.close();
                        }
                    } catch (final IOException ioe) {
                        LOG.error("Unable to close binary value: " + ioe.getMessage(), ioe);
                    }
                }
            }

            @Override
            public String getCacheClass() {
                return (String) getBrokerPool().getConfiguration().getProperty(Configuration.BINARY_CACHE_CLASS_PROPERTY);
            }
        };
    }

    private BrokerPool getBrokerPool() {
        return brokerPool;
    }

    @Override
    public void service(final HttpRequest request, final HttpResponse response, final ResourceFunctionExecuter resourceFunctionExecuter, final RestXqServiceSerializer restXqServiceSerializer) throws RestXqServiceException {
        super.service(request, response, resourceFunctionExecuter, restXqServiceSerializer);
        binaryValueManager.runCleanupTasks();
    }

    @Override
    protected Sequence extractRequestBody(final HttpRequest request) throws RestXqServiceException {

        //TODO don't use close shield input stream and move parsing of form parameters from HttpServletRequestAdapter into RequestBodyParser
        InputStream is;
        FilterInputStreamCache cache = null;

        try {

            //first, get the content of the request
            is = new CloseShieldInputStream(request.getInputStream());

            if (is.available() <= 0) {
                return null;
            }

            //if marking is not supported, we have to cache the input stream, so we can reread it, as we may use it twice (once for xml attempt and once for string attempt)
            if (!is.markSupported()) {
                cache = FilterInputStreamCacheFactory.getCacheInstance(() -> {
                    final Configuration configuration = getBrokerPool().getConfiguration();
                    return (String) configuration.getProperty(Configuration.BINARY_CACHE_CLASS_PROPERTY);
                }, is);

                is = new CachingFilterInputStream(cache);
            }

            is.mark(Integer.MAX_VALUE);
        } catch (final IOException ioe) {
            throw new RestXqServiceException(RestXqErrorCodes.RQDY0014, ioe);
        }

        Sequence result = null;
        try {

            //was there any POST content?
            if (is != null && is.available() > 0) {
                String contentType = request.getContentType();
                // 1) determine if exists mime database considers this binary data
                if (contentType != null) {
                    //strip off any charset encoding info
                    if (contentType.contains(";")) {
                        contentType = contentType.substring(0, contentType.indexOf(";"));
                    }

                    MimeType mimeType = MimeTable.getInstance().getContentType(contentType);
                    if (mimeType != null && !mimeType.isXMLType()) {

                        //binary data
                        try {

                            final BinaryValue binaryValue = BinaryValueFromInputStream.getInstance(binaryValueManager, new Base64BinaryValueType(), is);
                            if (binaryValue != null) {
                                result = new SequenceImpl<>(new BinaryTypedValue(binaryValue));
                            }
                        } catch (final XPathException xpe) {
                            throw new RestXqServiceException(RestXqErrorCodes.RQDY0014, xpe);
                        }
                    }
                }

                if (result == null) {
                    //2) not binary, try and parse as an XML document
                    final DocumentImpl doc = parseAsXml(is);
                    if (doc != null) {
                        result = new SequenceImpl<>(new DocumentTypedValue(doc));
                    }
                }

                if (result == null) {

                    String encoding = request.getCharacterEncoding();
                    // 3) not a valid XML document, return a string representation of the document
                    if (encoding == null) {
                        encoding = "UTF-8";
                    }

                    try {
                        //reset the stream, as we need to reuse for string parsing
                        is.reset();

                        final StringValue str = parseAsString(is, encoding);
                        if (str != null) {
                            result = new SequenceImpl<>(new StringTypedValue(str));
                        }
                    } catch (final IOException ioe) {
                        throw new RestXqServiceException(RestXqErrorCodes.RQDY0014, ioe);
                    }
                }
            }
        } catch (IOException e) {
            throw new RestXqServiceException(e.getMessage());
        } finally {

            if (cache != null) {
                try {
                    cache.invalidate();
                } catch (final IOException ioe) {
                    LOG.error(ioe.getMessage(), ioe);
                }
            }

            if (is != null) {
                /*
                 * Do NOT close the stream if its a binary value,
                 * because we will need it later for serialization
                 */
                boolean isBinaryType = false;
                if (result != null) {
                    try {
                        final Type type = result.head().getType();
                        isBinaryType = (type == Type.BASE64_BINARY || type == Type.HEX_BINARY);
                    } catch (final IndexOutOfBoundsException ioe) {
                        LOG.warn("Called head on an empty HTTP Request body sequence", ioe);
                    }
                }

                if (!isBinaryType) {
                    try {
                        is.close();
                    } catch (final IOException ioe) {
                        LOG.error(ioe.getMessage(), ioe);
                    }
                }
            }
        }

        if (result != null) {
            return result;
        } else {
            return Sequence.EMPTY_SEQUENCE;
        }
    }

    private DocumentImpl parseAsXml(final InputStream is) {

        DocumentImpl result = null;
        XMLReader reader = null;

        try {
            //try and construct xml document from input stream, we use eXist's in-memory DOM implementation

            //we have to use CloseShieldInputStream otherwise the parser closes the stream and we cant later reread
            final InputSource src = new InputSource(new CloseShieldInputStream(is));

            reader = getBrokerPool().getParserPool().borrowXMLReader();
            final MemTreeBuilder builder = new MemTreeBuilder();
            builder.startDocument();
            final DocumentBuilderReceiver receiver = new DocumentBuilderReceiver(builder, true);
            reader.setContentHandler(receiver);
            reader.setProperty("http://xml.org/sax/properties/lexical-handler", receiver);
            reader.parse(src);
            builder.endDocument();
            final Document doc = receiver.getDocument();

            result = (DocumentImpl) doc;
        } catch (final SAXException | IOException saxe) {
            //do nothing, we will default to trying to return a string below
        } finally {
            if (reader != null) {
                getBrokerPool().getParserPool().returnXMLReader(reader);
            }
        }

        return result;
    }

    private static StringValue parseAsString(final InputStream is, final String encoding) throws IOException {
        final String s;
        try (final FastByteArrayOutputStream bos = new FastByteArrayOutputStream(4096)) {
            bos.write(is);
            s = new String(bos.toByteArray(), encoding);
        }
        return new StringValue(s);
    }
}
    
    
    
    

    




    
    
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