/*
 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.xml.internal.ws.transport.http;

import com.sun.istack.internal.NotNull;
import com.sun.xml.internal.ws.api.BindingID;
import com.sun.xml.internal.ws.api.WSBinding;
import com.sun.xml.internal.ws.api.message.Packet;
import com.sun.xml.internal.ws.api.server.Container;
import com.sun.xml.internal.ws.api.server.SDDocumentSource;
import com.sun.xml.internal.ws.api.server.WSEndpoint;
import com.sun.xml.internal.ws.api.streaming.XMLStreamReaderFactory;
import com.sun.xml.internal.ws.binding.WebServiceFeatureList;
import com.sun.xml.internal.ws.handler.HandlerChainsModel;
import com.sun.xml.internal.ws.resources.ServerMessages;
import com.sun.xml.internal.ws.resources.WsservletMessages;
import com.sun.xml.internal.ws.server.EndpointFactory;
import com.sun.xml.internal.ws.server.ServerRtException;
import com.sun.xml.internal.ws.streaming.Attributes;
import com.sun.xml.internal.ws.streaming.TidyXMLStreamReader;
import com.sun.xml.internal.ws.streaming.XMLStreamReaderUtil;
import com.sun.xml.internal.ws.util.HandlerAnnotationInfo;
import com.sun.xml.internal.ws.util.exception.LocatableWebServiceException;
import com.sun.xml.internal.ws.util.xml.XmlUtil;
import org.xml.sax.EntityResolver;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.ws.WebServiceException;
import javax.xml.ws.http.HTTPBinding;
import javax.xml.ws.soap.MTOMFeature;
import javax.xml.ws.soap.SOAPBinding;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Parses {@code sun-jaxws.xml} into {@link WSEndpoint}.
 *
 * <p>
 * Since {@code sun-jaxws.xml} captures more information than what {@link WSEndpoint}
 * represents (in particular URL pattern and name), this class
 * takes a parameterization 'A' so that the user of this parser can choose to
 * create another type that wraps {@link WSEndpoint}.
 *
 * {@link HttpAdapter} and its derived type is used for this often,
 * but it can be anything.
 *
 * @author WS Development Team
 * @author Kohsuke Kawaguchi
 */
public class DeploymentDescriptorParser<A> {
    private final Container container;
    private final ClassLoader classLoader;
    private final ResourceLoader loader;
    private final AdapterFactory<A> adapterFactory;

    /**
     * Endpoint names that are declared.
     * Used to catch double definitions.
     */
    private final Set<String> names = new HashSet<String>();

    /**
     * WSDL/schema documents collected from /WEB-INF/wsdl. Keyed by the system ID.
     */
    private final Map<String,SDDocumentSource> docs = new HashMap<String,SDDocumentSource>();

    /**
     *
     * @param cl
     *      Used to load service implementations.
     * @param loader
     *      Used to locate resources, in particular WSDL.
     * @param container
     *      Optional {@link Container} that {@link WSEndpoint}s receive.
     * @param adapterFactory
     *      Creates {@link HttpAdapter} (or its derived class.)
     */
    public DeploymentDescriptorParser(ClassLoader cl, ResourceLoader loader, Container container, AdapterFactory<A> adapterFactory) throws MalformedURLException {
        classLoader = cl;
        this.loader = loader;
        this.container = container;
        this.adapterFactory = adapterFactory;

        collectDocs("/WEB-INF/wsdl/");
        logger.fine("war metadata="+docs);
    }

    /**
     * Parses the {@code sun-jaxws.xml} file and configures
     * a set of {@link HttpAdapter}s.
     */
    public @NotNull List<A> parse(String systemId, InputStream is) {
        XMLStreamReader reader = null;
        try {
            reader = new TidyXMLStreamReader(
                XMLStreamReaderFactory.create(systemId,is,true), is);
            XMLStreamReaderUtil.nextElementContent(reader);
            return parseAdapters(reader);
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (XMLStreamException e) {
                    throw new ServerRtException("runtime.parser.xmlReader",e);
                }
            }
            try {
                is.close();
            } catch (IOException e) {
                // ignore
            }
        }
    }

    /**
     * Parses the {@code sun-jaxws.xml} file and configures
     * a set of {@link HttpAdapter}s.
     */
    public @NotNull List<A> parse(File f) throws IOException {
        FileInputStream in = new FileInputStream(f);
        try {
            return parse(f.getPath(), in);
        } finally {
            in.close();
        }
    }

    /**
     * Get all the WSDL & schema documents recursively.
     */
    private void collectDocs(String dirPath) throws MalformedURLException {
        Set<String> paths = loader.getResourcePaths(dirPath);
        if (paths != null) {
            for (String path : paths) {
                if (path.endsWith("/")) {
                    if(path.endsWith("/CVS/") || path.endsWith("/.svn/"))
                        continue;
                    collectDocs(path);
                } else {
                    URL res = loader.getResource(path);
                    docs.put(res.toString(),SDDocumentSource.create(res));
                }
            }
        }
    }


    private List<A> parseAdapters(XMLStreamReader reader) {
        if (!reader.getName().equals(QNAME_ENDPOINTS)) {
            failWithFullName("runtime.parser.invalidElement", reader);
        }

        List<A> adapters = new ArrayList<A>();

        Attributes attrs = XMLStreamReaderUtil.getAttributes(reader);
        String version = getMandatoryNonEmptyAttribute(reader, attrs, ATTR_VERSION);
        if (!version.equals(ATTRVALUE_VERSION_1_0)) {
            failWithLocalName("runtime.parser.invalidVersionNumber",
                reader, version);
        }

        while (XMLStreamReaderUtil.nextElementContent(reader) !=
            XMLStreamConstants.END_ELEMENT) if (reader.getName().equals(QNAME_ENDPOINT)) {

            attrs = XMLStreamReaderUtil.getAttributes(reader);
            String name = getMandatoryNonEmptyAttribute(reader, attrs, ATTR_NAME);
            if (!names.add(name)) {
                logger.warning(
                        WsservletMessages.SERVLET_WARNING_DUPLICATE_ENDPOINT_NAME(/*name*/));
            }

            String implementationName =
                    getMandatoryNonEmptyAttribute(reader, attrs, ATTR_IMPLEMENTATION);
            Class<?> implementorClass = getImplementorClass(implementationName,reader);
            EndpointFactory.verifyImplementorClass(implementorClass);

            SDDocumentSource primaryWSDL = getPrimaryWSDL(reader, attrs, implementorClass);

            QName serviceName = getQNameAttribute(attrs, ATTR_SERVICE);
            if (serviceName == null)
                serviceName = EndpointFactory.getDefaultServiceName(implementorClass);

            QName portName = getQNameAttribute(attrs, ATTR_PORT);
            if (portName == null)
                portName = EndpointFactory.getDefaultPortName(serviceName, implementorClass);

            //get enable-mtom attribute value
            String enable_mtom = getAttribute(attrs, ATTR_ENABLE_MTOM);
            String mtomThreshold = getAttribute(attrs, ATTR_MTOM_THRESHOLD_VALUE);
            String bindingId = getAttribute(attrs, ATTR_BINDING);
            if (bindingId != null)
                // Convert short-form tokens to API's binding ids
                bindingId = getBindingIdForToken(bindingId);
            WSBinding binding = createBinding(bindingId,implementorClass,
                    enable_mtom,mtomThreshold);
            String urlPattern =
                    getMandatoryNonEmptyAttribute(reader, attrs, ATTR_URL_PATTERN);

            // TODO use 'docs' as the metadata. If wsdl is non-null it's the primary.

            boolean handlersSetInDD = setHandlersAndRoles(binding, reader, serviceName, portName);

            ensureNoContent(reader);
            WSEndpoint<?> endpoint = WSEndpoint.create(
                    implementorClass, !handlersSetInDD,
                    null,
                    serviceName, portName, container, binding,
                    primaryWSDL, docs.values(), createEntityResolver(),false
            );
            adapters.add(adapterFactory.createAdapter(name, urlPattern, endpoint));
        } else {
            failWithLocalName("runtime.parser.invalidElement", reader);
        }
        return adapters;
    }

    /**
     * @param ddBindingId
     *      binding id explicitlyspecified in the DeploymentDescriptor or parameter
     * @param implClass
     *      Endpoint Implementation class
     * @param mtomEnabled
     *      represents mtom-enabled attribute in DD
     * @param mtomThreshold
     *      threshold value specified in DD
     * @return
     *      is returned with only MTOMFeature set resolving the various precendece rules
     */
    private static WSBinding createBinding(String ddBindingId,Class implClass,
                                          String mtomEnabled, String mtomThreshold) {
        // Features specified through DD
        WebServiceFeatureList features;

        MTOMFeature mtomfeature = null;
        if (mtomEnabled != null) {
            if (mtomThreshold != null)
                mtomfeature = new MTOMFeature(Boolean.valueOf(mtomEnabled),
                        Integer.valueOf(mtomThreshold));
            else
                mtomfeature = new MTOMFeature(Boolean.valueOf(mtomEnabled));
        }


        BindingID bindingID;
        if (ddBindingId != null) {
            bindingID = BindingID.parse(ddBindingId);
            features = bindingID.createBuiltinFeatureList();

            if(checkMtomConflict(features.get(MTOMFeature.class),mtomfeature)) {
                throw new ServerRtException(ServerMessages.DD_MTOM_CONFLICT(ddBindingId, mtomEnabled));
            }
        } else {
            bindingID = BindingID.parse(implClass);
            // Since bindingID is coming from implclass,
            // mtom through Feature annotation or DD takes precendece

            features = new WebServiceFeatureList();
            if(mtomfeature != null)
                features.add(mtomfeature); // this wins over MTOM setting in bindingID
            features.addAll(bindingID.createBuiltinFeatureList());
        }

        return bindingID.createBinding(features.toArray());
    }

    private static boolean checkMtomConflict(MTOMFeature lhs, MTOMFeature rhs) {
        if(lhs==null || rhs==null)  return false;
        return lhs.isEnabled() ^ rhs.isEnabled();
    }

    /**
     * JSR-109 defines short-form tokens for standard binding Ids. These are
     * used only in DD. So stand alone deployment descirptor should also honor
     * these tokens. This method converts the tokens to API's standard
     * binding ids
     *
     * @param lexical binding attribute value from DD. Always not null
     *
     * @return returns corresponding API's binding ID or the same lexical
     */
    public static @NotNull String getBindingIdForToken(@NotNull String lexical) {
        if (lexical.equals("##SOAP11_HTTP")) {
            return SOAPBinding.SOAP11HTTP_BINDING;
        } else if (lexical.equals("##SOAP11_HTTP_MTOM")) {
            return SOAPBinding.SOAP11HTTP_MTOM_BINDING;
        } else if (lexical.equals("##SOAP12_HTTP")) {
            return SOAPBinding.SOAP12HTTP_BINDING;
        } else if (lexical.equals("##SOAP12_HTTP_MTOM")) {
            return SOAPBinding.SOAP12HTTP_MTOM_BINDING;
        } else if (lexical.equals("##XML_HTTP")) {
            return HTTPBinding.HTTP_BINDING;
        }
        return lexical;
    }

    /**
     * Creates a new "Adapter".
     *
     * <P>
     * Normally 'A' would be {@link HttpAdapter} or some derived class.
     * But the parser doesn't require that to be of any particular type.
     */
    public static interface AdapterFactory<A> {
        A createAdapter(String name, String urlPattern, WSEndpoint<?> endpoint);
    }

    /**
     * Checks the deployment descriptor or {@link @WebServiceProvider} annotation
     * to see if it points to any WSDL. If so, returns the {@link SDDocumentSource}.
     *
     * @return
     *      The pointed WSDL, if any. Otherwise null.
     */
    private SDDocumentSource getPrimaryWSDL(XMLStreamReader xsr, Attributes attrs, Class<?> implementorClass) {

        String wsdlFile = getAttribute(attrs, ATTR_WSDL);
        if (wsdlFile == null) {
            wsdlFile = EndpointFactory.getWsdlLocation(implementorClass);
        }

        if (wsdlFile!=null) {
            if (!wsdlFile.startsWith(JAXWS_WSDL_DD_DIR)) {
                logger.warning("Ignoring wrong wsdl="+wsdlFile+". It should start with "
                        +JAXWS_WSDL_DD_DIR
                        +". Going to generate and publish a new WSDL.");
                return null;
            }

            URL wsdl;
            try {
                wsdl = loader.getResource('/'+wsdlFile);
            } catch (MalformedURLException e) {
                throw new LocatableWebServiceException(
                    ServerMessages.RUNTIME_PARSER_WSDL_NOT_FOUND(wsdlFile), e, xsr );
            }
            if (wsdl == null) {
                throw new LocatableWebServiceException(
                    ServerMessages.RUNTIME_PARSER_WSDL_NOT_FOUND(wsdlFile), xsr );
            }
            SDDocumentSource docInfo = docs.get(wsdl.toExternalForm());
            assert docInfo != null;
            return docInfo;
        }

        return null;
    }

    /**
     * Creates an {@link EntityResolver} that consults {@code /WEB-INF/jax-ws-catalog.xml}.
     */
    private EntityResolver createEntityResolver() {
        try {
            return XmlUtil.createEntityResolver(loader.getCatalogFile());
        } catch(MalformedURLException e) {
            throw new WebServiceException(e);
        }
    }

    protected String getAttribute(Attributes attrs, String name) {
        String value = attrs.getValue(name);
        if (value != null) {
            value = value.trim();
        }
        return value;
    }

    protected QName getQNameAttribute(Attributes attrs, String name) {
        String value = getAttribute(attrs, name);
        if (value == null || value.equals("")) {
            return null;
        } else {
            return QName.valueOf(value);
        }
    }

    protected String getNonEmptyAttribute(XMLStreamReader reader, Attributes attrs, String name) {
        String value = getAttribute(attrs, name);
        if (value != null && value.equals("")) {
            failWithLocalName(
                "runtime.parser.invalidAttributeValue",
                reader,
                name);
        }
        return value;
    }

    protected String getMandatoryAttribute(XMLStreamReader reader, Attributes attrs, String name) {
        String value = getAttribute(attrs, name);
        if (value == null) {
            failWithLocalName("runtime.parser.missing.attribute", reader, name);
        }
        return value;
    }

    protected String getMandatoryNonEmptyAttribute(XMLStreamReader reader, Attributes attributes,
                                                   String name) {
        String value = getAttribute(attributes, name);
        if (value == null) {
            failWithLocalName("runtime.parser.missing.attribute", reader, name);
        } else if (value.equals("")) {
            failWithLocalName(
                "runtime.parser.invalidAttributeValue",
                reader,
                name);
        }
        return value;
    }

    /**
     * Parses the handler and role information and sets it
     * on the {@link WSBinding}.
     * @return true if <handler-chains> element present in DD
     *         false otherwise.
     */
    protected boolean setHandlersAndRoles(WSBinding binding, XMLStreamReader reader, QName serviceName, QName portName) {

        if (XMLStreamReaderUtil.nextElementContent(reader) ==
            XMLStreamConstants.END_ELEMENT ||
            !reader.getName().equals(
            HandlerChainsModel.QNAME_HANDLER_CHAINS)) {

            return false;
        }

        HandlerAnnotationInfo handlerInfo = HandlerChainsModel.parseHandlerFile(
            reader, classLoader,serviceName, portName, binding);

        binding.setHandlerChain(handlerInfo.getHandlers());
        if (binding instanceof SOAPBinding) {
            ((SOAPBinding)binding).setRoles(handlerInfo.getRoles());
        }

        // move past </handler-chains>
        XMLStreamReaderUtil.nextContent(reader);
        return true;
    }

    protected static void ensureNoContent(XMLStreamReader reader) {
        if (reader.getEventType() != XMLStreamConstants.END_ELEMENT) {
            fail("runtime.parser.unexpectedContent", reader);
        }
    }

    protected static void fail(String key, XMLStreamReader reader) {
        logger.log(Level.SEVERE, key + reader.getLocation().getLineNumber());
        throw new ServerRtException(
            key,
            Integer.toString(reader.getLocation().getLineNumber()));
    }

    protected static void failWithFullName(String key, XMLStreamReader reader) {
        throw new ServerRtException(
            key,
            reader.getLocation().getLineNumber(),
            reader.getName());
    }

    protected static void failWithLocalName(String key, XMLStreamReader reader) {
        throw new ServerRtException(
            key,
            reader.getLocation().getLineNumber(),
            reader.getLocalName());
    }

    protected static void failWithLocalName(
        String key,
        XMLStreamReader reader,
        String arg) {
        throw new ServerRtException(
            key,
            reader.getLocation().getLineNumber(),
            reader.getLocalName(),
            arg);
    }

    protected Class loadClass(String name) {
        try {
            return Class.forName(name, true, classLoader);
        } catch (ClassNotFoundException e) {
            logger.log(Level.SEVERE, e.getMessage(), e);
            throw new ServerRtException(
                "runtime.parser.classNotFound",
                name);
        }
    }


    /**
     * Loads the class of the given name.
     *
     * @param xsr
     *      Used to report the source location information if there's any error.
     */
    private Class getImplementorClass(String name, XMLStreamReader xsr) {
        try {
            return Class.forName(name, true, classLoader);
        } catch (ClassNotFoundException e) {
            logger.log(Level.SEVERE, e.getMessage(), e);
            throw new LocatableWebServiceException(
                ServerMessages.RUNTIME_PARSER_CLASS_NOT_FOUND(name), e, xsr );
        }
    }

    public static final String NS_RUNTIME =
        "http://java.sun.com/xml/ns/jax-ws/ri/runtime";

    public static final String JAXWS_WSDL_DD_DIR = "WEB-INF/wsdl";

    public static final QName QNAME_ENDPOINTS =
        new QName(NS_RUNTIME, "endpoints");
    public static final QName QNAME_ENDPOINT =
        new QName(NS_RUNTIME, "endpoint");

    public static final String ATTR_VERSION = "version";
    public static final String ATTR_NAME = "name";
    public static final String ATTR_IMPLEMENTATION = "implementation";
    public static final String ATTR_WSDL = "wsdl";
    public static final String ATTR_SERVICE = "service";
    public static final String ATTR_PORT = "port";
    public static final String ATTR_URL_PATTERN = "url-pattern";
    public static final String ATTR_ENABLE_MTOM = "enable-mtom";
    public static final String ATTR_MTOM_THRESHOLD_VALUE = "mtom-threshold-value";
    public static final String ATTR_BINDING = "binding";

    public static final String ATTRVALUE_VERSION_1_0 = "2.0";
    private static final Logger logger =
        Logger.getLogger(
            com.sun.xml.internal.ws.util.Constants.LoggingDomain + ".server.http");
}
