//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.ee9.quickstart;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import jakarta.servlet.DispatcherType;
import jakarta.servlet.MultipartConfigElement;
import jakarta.servlet.ServletContext;
import jakarta.servlet.SessionCookieConfig;
import jakarta.servlet.SessionTrackingMode;
import jakarta.servlet.descriptor.JspPropertyGroupDescriptor;
import jakarta.servlet.descriptor.TaglibDescriptor;
import org.eclipse.jetty.ee9.annotations.AnnotationConfiguration;
import org.eclipse.jetty.ee9.nested.ServletConstraint;
import org.eclipse.jetty.ee9.nested.SessionHandler;
import org.eclipse.jetty.ee9.security.Authenticator;
import org.eclipse.jetty.ee9.security.ConstraintAware;
import org.eclipse.jetty.ee9.security.ConstraintMapping;
import org.eclipse.jetty.ee9.security.SecurityHandler;
import org.eclipse.jetty.ee9.security.authentication.FormAuthenticator;
import org.eclipse.jetty.ee9.servlet.ErrorPageErrorHandler;
import org.eclipse.jetty.ee9.servlet.FilterHolder;
import org.eclipse.jetty.ee9.servlet.FilterMapping;
import org.eclipse.jetty.ee9.servlet.ListenerHolder;
import org.eclipse.jetty.ee9.servlet.ServletContextHandler.JspConfig;
import org.eclipse.jetty.ee9.servlet.ServletContextHandler.ServletContainerInitializerStarter;
import org.eclipse.jetty.ee9.servlet.ServletHandler;
import org.eclipse.jetty.ee9.servlet.ServletHolder;
import org.eclipse.jetty.ee9.servlet.ServletMapping;
import org.eclipse.jetty.ee9.servlet.Source;
import org.eclipse.jetty.ee9.webapp.AbstractConfiguration;
import org.eclipse.jetty.ee9.webapp.MetaData;
import org.eclipse.jetty.ee9.webapp.MetaData.OriginInfo;
import org.eclipse.jetty.ee9.webapp.MetaInfConfiguration;
import org.eclipse.jetty.ee9.webapp.WebAppContext;
import org.eclipse.jetty.ee9.webapp.WebInfConfiguration;
import org.eclipse.jetty.http.MimeTypes;
import org.eclipse.jetty.plus.annotation.LifeCycleCallback;
import org.eclipse.jetty.plus.annotation.LifeCycleCallbackCollection;
import org.eclipse.jetty.util.QuotedStringTokenizer;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.resource.AttributeNormalizer;
import org.eclipse.jetty.util.resource.Resource;
import org.eclipse.jetty.xml.XmlAppendable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.eclipse.jetty.ee9.nested.Response.HttpCookieFacade.getCommentWithAttributes;

/**
 * QuickStartGeneratorConfiguration
 * <p>
 * Generate an effective web.xml from a WebAppContext, including all components
 * from web.xml, web-fragment.xmls annotations etc.
 * <p>
 * If generating quickstart for a different java platform than the current running
 * platform, then the org.eclipse.jetty.ee9.annotations.javaTargetPlatform attribute
 * should be set on the Context with the platform number of the target JVM (eg 8).
 */
public class QuickStartGeneratorConfiguration extends AbstractConfiguration
{
    static final Logger LOG = LoggerFactory.getLogger(QuickStartGeneratorConfiguration.class);
    public static final String ORIGIN = "org.eclipse.jetty.originAttribute";
    public static final String DEFAULT_ORIGIN_ATTRIBUTE_NAME = "origin";

    protected final boolean _abort;
    protected String _originAttribute;
    protected int _count;
    protected Path _quickStartWebXml;
   
    public QuickStartGeneratorConfiguration()
    {
        this(false);
    }

    public QuickStartGeneratorConfiguration(boolean abort)
    {
        super(false);
        _count = 0;
        _abort = abort;
    }

    @Override
    public boolean abort(WebAppContext context)
    {
        return _abort;
    }

    public void setOriginAttribute(String name)
    {
        _originAttribute = name;
    }

    /**
     * Get the originAttribute.
     * @return the originAttribute
     */
    public String getOriginAttribute()
    {
        return _originAttribute;
    }

    public Path getQuickStartWebXml()
    {
        return _quickStartWebXml;
    }

    public void setQuickStartWebXml(Path quickStartWebXml)
    {
        _quickStartWebXml = quickStartWebXml;
    }

    /**
     * Perform the generation of the xml file
     *
     * @param stream the stream to generate the quickstart-web.xml to
     * @throws IOException if unable to generate the quickstart-web.xml
     * @throws FileNotFoundException if unable to find the file
     */
    public void generateQuickStartWebXml(WebAppContext context, OutputStream stream) throws FileNotFoundException, IOException
    {
        if (context == null)
            throw new IllegalStateException("No webapp for quickstart generation");
        if (stream == null)
            throw new IllegalStateException("No output for quickstart generation");

        if (_originAttribute == null)
            _originAttribute = DEFAULT_ORIGIN_ATTRIBUTE_NAME;
        context.getMetaData().getOrigins();

        if (context.getBaseResource() == null)
            throw new IllegalArgumentException("No base resource for " + this);

        MetaData md = context.getMetaData();

        Map<String, String> webappAttr = new HashMap<>();
        int major = context.getServletContext().getEffectiveMajorVersion();
        int minor = context.getServletContext().getEffectiveMinorVersion();
        String ns = (major < 5) ? "http://xmlns.jcp.org/xml/ns/javaee" : "https://jakarta.ee/xml/ns/jakartaee";

        webappAttr.put("xmlns", ns);
        webappAttr.put("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
        webappAttr.put("xsi:schemaLocation", String.format("%s %s/web-app_%d_%d.xsd", ns, ns, major, minor));
        webappAttr.put("metadata-complete", Boolean.toString(context.getMetaData().isMetaDataComplete()));
        webappAttr.put("version", major + "." + minor);

        XmlAppendable out = new XmlAppendable(stream);
        out.openTag("web-app", webappAttr);
        if (context.getDisplayName() != null)
            out.tag("display-name", context.getDisplayName());

        // Set some special context parameters
        Resource base = context.getBaseResource();
        base = (base != null ? base.iterator().next() : null);
        AttributeNormalizer normalizer = new AttributeNormalizer(base);

        // The library order
        addContextParamFromAttribute(context, out, ServletContext.ORDERED_LIBS);
        //the servlet container initializers
        //addContextParamFromAttribute(context, out, AnnotationConfiguration.CONTAINER_INITIALIZERS);
        //TODO think of better label rather than the unused attribute, also how to retrieve the scis
        ServletContainerInitializerStarter sciStarter = context.getBean(ServletContainerInitializerStarter.class);
        addContextParamFromCollection(context, out, AnnotationConfiguration.CONTAINER_INITIALIZERS,
            sciStarter == null ? Collections.emptySet() : sciStarter.getServletContainerInitializerHolders());
        //the tlds discovered
        addContextParamFromAttribute(context, out, MetaInfConfiguration.METAINF_TLDS, normalizer);
        //the META-INF/resources discovered
        addContextParamFromAttribute(context, out, MetaInfConfiguration.METAINF_RESOURCES, normalizer);

        // the default-context-path, if present
        String defaultContextPath = (String)context.getAttribute("default-context-path");
        if (defaultContextPath != null)
            out.tag("default-context-path", defaultContextPath);
        
        String requestEncoding = (String)context.getAttribute("request-character-encoding");
        if (!StringUtil.isBlank(requestEncoding))
            out.tag("request-character-encoding", requestEncoding);
        
        String responseEncoding = (String)context.getAttribute("response-character-encoding");
        if (!StringUtil.isBlank(responseEncoding))
            out.tag("response-character-encoding", responseEncoding);

        //add the name of the origin attribute, if it is being used
        if (StringUtil.isNotBlank(_originAttribute))
        {
            out.openTag("context-param")
                .tag("param-name", ORIGIN)
                .tag("param-value", _originAttribute)
                .closeTag();
        }

        // init params
        for (String p : context.getInitParams().keySet())
        {
            out.openTag("context-param", origin(md, "context-param." + p))
                .tag("param-name", p)
                .tag("param-value", context.getInitParameter(p))
                .closeTag();
        }

        if (context.getServletHandler().getListeners() != null)
            for (ListenerHolder e : context.getServletHandler().getListeners())
            {
                if (e.getSource() == Source.EMBEDDED)
                    continue;
                
                out.openTag("listener", origin(md, e.getClassName() + ".listener"))
                    .tag("listener-class", e.getClassName())
                    .closeTag();
            }

        ServletHandler servlets = context.getServletHandler();

        if (servlets.getFilters() != null)
        {
            for (FilterHolder holder : servlets.getFilters())
            {
                if (holder.getSource() == Source.EMBEDDED)
                    continue;
                outholder(out, md, holder);
            }
        }

        if (servlets.getFilterMappings() != null)
        {
            for (FilterMapping mapping :servlets.getFilterMappings())
            {
                FilterHolder f = servlets.getFilter(mapping.getFilterName());
                if (f != null && f.getSource() == Source.EMBEDDED)
                    continue;
                
                out.openTag("filter-mapping", origin(md, mapping.getFilterName() + ".filter.mapping." + Long.toHexString(mapping.hashCode())));
                out.tag("filter-name", mapping.getFilterName());
                if (mapping.getPathSpecs() != null)
                    for (String s : mapping.getPathSpecs())
                    {
                        out.tag("url-pattern", s);
                    }
                if (mapping.getServletNames() != null)
                    for (String n : mapping.getServletNames())
                    {
                        out.tag("servlet-name", n);
                    }

                if (!mapping.isDefaultDispatches())
                {
                    if (mapping.appliesTo(DispatcherType.REQUEST))
                        out.tag("dispatcher", "REQUEST");
                    if (mapping.appliesTo(DispatcherType.ASYNC))
                        out.tag("dispatcher", "ASYNC");
                    if (mapping.appliesTo(DispatcherType.ERROR))
                        out.tag("dispatcher", "ERROR");
                    if (mapping.appliesTo(DispatcherType.FORWARD))
                        out.tag("dispatcher", "FORWARD");
                    if (mapping.appliesTo(DispatcherType.INCLUDE))
                        out.tag("dispatcher", "INCLUDE");
                }
                out.closeTag();
            }
        }

        if (servlets.getServlets() != null)
        {
            for (ServletHolder holder : servlets.getServlets())
            {
                if (holder.getSource() == Source.EMBEDDED)
                    continue;
                outholder(out, md, holder);
            }
        }

        if (servlets.getServletMappings() != null)
        {
            for (ServletMapping mapping : servlets.getServletMappings())
            {
                ServletHolder sh = servlets.getServlet(mapping.getServletName());
                if (sh != null && sh.getSource() == Source.EMBEDDED)
                    continue;
                
                out.openTag("servlet-mapping", origin(md, mapping.getServletName() + ".servlet.mapping." + Long.toHexString(mapping.hashCode())));
                out.tag("servlet-name", mapping.getServletName());
                if (mapping.getPathSpecs() != null)
                    for (String s : mapping.getPathSpecs())
                    {
                        out.tag("url-pattern", s);
                    }
                out.closeTag();
            }
        }

        // Security elements
        SecurityHandler security = context.getSecurityHandler();

        if (security != null && (security.getRealmName() != null || security.getAuthMethod() != null))
        {
            out.openTag("login-config");
            if (security.getAuthMethod() != null)
                out.tag("auth-method", origin(md, "auth-method"), security.getAuthMethod());
            if (security.getRealmName() != null)
                out.tag("realm-name", origin(md, "realm-name"), security.getRealmName());

            if (Authenticator.FORM_AUTH.equalsIgnoreCase(security.getAuthMethod()))
            {
                out.openTag("form-login-config");
                out.tag("form-login-page", origin(md, "form-login-page"), security.getInitParameter(FormAuthenticator.__FORM_LOGIN_PAGE));
                out.tag("form-error-page", origin(md, "form-error-page"), security.getInitParameter(FormAuthenticator.__FORM_ERROR_PAGE));
                out.closeTag();
            }

            out.closeTag();
        }

        if (security instanceof ConstraintAware)
        {
            ConstraintAware ca = (ConstraintAware)security;
            for (String r : ca.getRoles())
            {
                out.openTag("security-role", origin(md, "security-role." + r))
                    .tag("role-name", r)
                    .closeTag();
            }

            for (ConstraintMapping m : ca.getConstraintMappings())
            {
                out.openTag("security-constraint");

                out.openTag("web-resource-collection");
                {
                    if (m.getConstraint().getName() != null)
                        out.tag("web-resource-name", m.getConstraint().getName());
                    if (m.getPathSpec() != null)
                        out.tag("url-pattern", origin(md, "constraint.url." + m.getPathSpec()), m.getPathSpec());
                    if (m.getMethod() != null)
                        out.tag("http-method", m.getMethod());

                    if (m.getMethodOmissions() != null)
                        for (String o : m.getMethodOmissions())
                        {
                            out.tag("http-method-omission", o);
                        }

                    out.closeTag();
                }

                if (m.getConstraint().getAuthenticate())
                {
                    String[] roles = m.getConstraint().getRoles();
                    if (roles != null && roles.length > 0)
                    {
                        out.openTag("auth-constraint");
                        if (m.getConstraint().getRoles() != null)
                            for (String r : m.getConstraint().getRoles())
                            {
                                out.tag("role-name", r);
                            }
                        out.closeTag();
                    }
                    else
                        out.tag("auth-constraint");
                }

                switch (m.getConstraint().getDataConstraint())
                {
                    case ServletConstraint.DC_NONE:
                        out.openTag("user-data-constraint").tag("transport-guarantee", "NONE").closeTag();
                        break;

                    case ServletConstraint.DC_INTEGRAL:
                        out.openTag("user-data-constraint").tag("transport-guarantee", "INTEGRAL").closeTag();
                        break;

                    case ServletConstraint.DC_CONFIDENTIAL:
                        out.openTag("user-data-constraint").tag("transport-guarantee", "CONFIDENTIAL").closeTag();
                        break;

                    default:
                        break;
                }

                out.closeTag();
            }
        }

        if (context.getWelcomeFiles() != null)
        {
            out.openTag("welcome-file-list");
            for (String welcomeFile : context.getWelcomeFiles())
            {
                out.tag("welcome-file", origin(md, "welcome-file." + welcomeFile), welcomeFile);
            }
            out.closeTag();
        }

        Map<String, String> localeEncodings = context.getLocaleEncodings();
        if (localeEncodings != null && !localeEncodings.isEmpty())
        {
            out.openTag("locale-encoding-mapping-list");
            for (Map.Entry<String, String> entry : localeEncodings.entrySet())
            {
                out.openTag("locale-encoding-mapping", origin(md, "locale-encoding." + entry.getKey()));
                out.tag("locale", entry.getKey());
                out.tag("encoding", entry.getValue());
                out.closeTag();
            }
            out.closeTag();
        }

        //session-config
        SessionHandler sessionHandler = context.getSessionHandler();
        if (sessionHandler != null)
        {
            out.openTag("session-config");
            int maxInactiveSec = sessionHandler.getMaxInactiveInterval();
            out.tag("session-timeout", (maxInactiveSec == 0 ? "0" : Integer.toString(maxInactiveSec / 60)));

            //cookie-config
            SessionCookieConfig cookieConfig = sessionHandler.getSessionCookieConfig();
            if (cookieConfig != null)
            {
                out.openTag("cookie-config");
                
                if (cookieConfig.getName() != null)
                    out.tag("name", origin(md, "cookie-config.name"), cookieConfig.getName());

                if (cookieConfig.getDomain() != null)
                    out.tag("domain", origin(md, "cookie-config.domain"), cookieConfig.getDomain());

                if (cookieConfig.getPath() != null)
                    out.tag("path", origin(md, "cookie-config.path"), cookieConfig.getPath());

                String comment = getCommentWithAttributes(cookieConfig.getComment(), sessionHandler.isPartitioned(), sessionHandler.getSameSite());
                if (comment != null)
                    out.tag("comment", origin(md, "cookie-config.comment"), comment);

                out.tag("http-only", origin(md, "cookie-config.http-only"), Boolean.toString(cookieConfig.isHttpOnly()));
                out.tag("secure", origin(md, "cookie-config.secure"), Boolean.toString(cookieConfig.isSecure()));
                out.tag("max-age", origin(md, "cookie-config.max-age"), Integer.toString(cookieConfig.getMaxAge()));
                out.closeTag();
            }

            // tracking-modes
            Set<SessionTrackingMode> modes = sessionHandler.getEffectiveSessionTrackingModes();
            if (modes != null)
            {
                for (SessionTrackingMode mode : modes)
                {
                    out.tag("tracking-mode", mode.toString());
                }
            }

            out.closeTag();
        }

        //error-pages
        Map<String, String> errorPages = ((ErrorPageErrorHandler)context.getErrorHandler()).getErrorPages();
        if (errorPages != null)
        {
            for (Map.Entry<String, String> entry : errorPages.entrySet())
            {
                out.openTag("error-page", origin(md, "error." + entry.getKey()));
                //a global or default error page has no code or exception               
                if (!ErrorPageErrorHandler.GLOBAL_ERROR_PAGE.equals(entry.getKey()))
                {
                    if (entry.getKey().matches("\\d{3}"))
                        out.tag("error-code", entry.getKey());
                    else
                        out.tag("exception-type", entry.getKey());
                }
                out.tag("location", entry.getValue());
                out.closeTag();
            }
        }

        //mime-types
        MimeTypes mimeTypes = context.getMimeTypes();
        if (mimeTypes != null)
        {
            for (Map.Entry<String, String> entry : mimeTypes.getMimeMap().entrySet())
            {
                out.openTag("mime-mapping");
                out.tag("extension", origin(md, "extension." + entry.getKey()), entry.getKey());
                out.tag("mime-type", entry.getValue());
                out.closeTag();
            }
        }

        //jsp-config
        JspConfig jspConfig = (JspConfig)context.getServletContext().getJspConfigDescriptor();
        if (jspConfig != null)
        {
            out.openTag("jsp-config");
            Collection<TaglibDescriptor> tlds = jspConfig.getTaglibs();
            if (tlds != null && !tlds.isEmpty())
            {
                for (TaglibDescriptor tld : tlds)
                {
                    out.openTag("taglib");
                    out.tag("taglib-uri", tld.getTaglibURI());
                    out.tag("taglib-location", tld.getTaglibLocation());
                    out.closeTag();
                }
            }

            Collection<JspPropertyGroupDescriptor> jspPropertyGroups = jspConfig.getJspPropertyGroups();
            if (jspPropertyGroups != null && !jspPropertyGroups.isEmpty())
            {
                for (JspPropertyGroupDescriptor jspPropertyGroup : jspPropertyGroups)
                {
                    out.openTag("jsp-property-group");
                    Collection<String> strings = jspPropertyGroup.getUrlPatterns();
                    if (strings != null && !strings.isEmpty())
                    {
                        for (String urlPattern : strings)
                        {
                            out.tag("url-pattern", urlPattern);
                        }
                    }

                    if (jspPropertyGroup.getElIgnored() != null)
                        out.tag("el-ignored", jspPropertyGroup.getElIgnored());

                    if (jspPropertyGroup.getPageEncoding() != null)
                        out.tag("page-encoding", jspPropertyGroup.getPageEncoding());

                    if (jspPropertyGroup.getScriptingInvalid() != null)
                        out.tag("scripting-invalid", jspPropertyGroup.getScriptingInvalid());

                    if (jspPropertyGroup.getIsXml() != null)
                        out.tag("is-xml", jspPropertyGroup.getIsXml());

                    if (jspPropertyGroup.getDeferredSyntaxAllowedAsLiteral() != null)
                        out.tag("deferred-syntax-allowed-as-literal", jspPropertyGroup.getDeferredSyntaxAllowedAsLiteral());

                    if (jspPropertyGroup.getTrimDirectiveWhitespaces() != null)
                        out.tag("trim-directive-whitespaces", jspPropertyGroup.getTrimDirectiveWhitespaces());

                    if (jspPropertyGroup.getDefaultContentType() != null)
                        out.tag("default-content-type", jspPropertyGroup.getDefaultContentType());

                    if (jspPropertyGroup.getBuffer() != null)
                        out.tag("buffer", jspPropertyGroup.getBuffer());

                    if (jspPropertyGroup.getErrorOnUndeclaredNamespace() != null)
                        out.tag("error-on-undeclared-namespace", jspPropertyGroup.getErrorOnUndeclaredNamespace());

                    strings = jspPropertyGroup.getIncludePreludes();
                    if (strings != null && !strings.isEmpty())
                    {
                        for (String prelude : strings)
                        {
                            out.tag("include-prelude", prelude);
                        }
                    }

                    strings = jspPropertyGroup.getIncludeCodas();
                    if (strings != null && !strings.isEmpty())
                    {
                        for (String coda : strings)
                        {
                            out.tag("include-coda", coda);
                        }
                    }

                    out.closeTag();
                }
            }

            out.closeTag();
        }

        //lifecycle: post-construct, pre-destroy
        LifeCycleCallbackCollection lifecycles = ((LifeCycleCallbackCollection)context.getAttribute(LifeCycleCallbackCollection.LIFECYCLE_CALLBACK_COLLECTION));
        if (lifecycles != null)
        {
            Collection<LifeCycleCallback> tmp = lifecycles.getPostConstructCallbacks();

            for (LifeCycleCallback c : tmp)
            {
                out.openTag("post-construct");
                out.tag("lifecycle-callback-class", c.getTargetClassName());
                out.tag("lifecycle-callback-method", c.getMethodName());
                out.closeTag();
            }

            tmp = lifecycles.getPreDestroyCallbacks();
            for (LifeCycleCallback c : tmp)
            {
                out.openTag("pre-destroy");
                out.tag("lifecycle-callback-class", c.getTargetClassName());
                out.tag("lifecycle-callback-method", c.getMethodName());
                out.closeTag();
            }
        }

        ExtraXmlDescriptorProcessor extraXmlProcessor = (ExtraXmlDescriptorProcessor)context.getAttribute(ExtraXmlDescriptorProcessor.class.getName());
        out.literal(extraXmlProcessor.getXML());
        out.closeTag();
    }

    private void addContextParamFromCollection(WebAppContext context, XmlAppendable out, String name, Collection<?> collection)
        throws IOException
    {
        if (collection == null)
            return;

        StringBuilder v = new StringBuilder();
        for (Object i : collection)
        {
            if (i != null)
            {
                if (v.length() > 0)
                    v.append(",\n    ");
                else
                    v.append("\n    ");
                QuotedStringTokenizer.CSV.quote(v, i.toString());
            }
        }
        out.openTag("context-param")
            .tag("param-name", name)
            .tagCDATA("param-value", v.toString())
            .closeTag();
    }
    
    /**
     * Turn attribute into context-param to store.
     */
    private void addContextParamFromAttribute(WebAppContext context, XmlAppendable out, String attribute) throws IOException
    {
        Object o = context.getAttribute(attribute);
        if (o == null)
            return;

        Collection<?> c = (o instanceof Collection) ? (Collection<?>)o : Collections.singletonList(o);
        addContextParamFromCollection(context, out, attribute, c);
    }

    /**
     * Turn context attribute into context-param to store.
     */
    private void addContextParamFromAttribute(WebAppContext context, XmlAppendable out, String attribute, AttributeNormalizer normalizer) throws IOException
    {
        Object o = context.getAttribute(attribute);
        if (o == null)
            return;

        Collection<?> c = (o instanceof Collection) ? (Collection<?>)o : Collections.singletonList(o);
        StringBuilder v = new StringBuilder();
        for (Object i : c)
        {
            if (i != null)
            {
                if (v.length() > 0)
                    v.append(",\n    ");
                else
                    v.append("\n    ");
                QuotedStringTokenizer.CSV.quote(v, normalizer.normalize(i));
            }
        }
        out.openTag("context-param")
            .tag("param-name", attribute)
            .tagCDATA("param-value", v.toString())
            .closeTag();
    }

    /**
     * Generate xml for a Holder (Filter/Servlet)
     */
    private void outholder(XmlAppendable out, MetaData md, FilterHolder holder) throws IOException
    {
        if (LOG.isDebugEnabled())
            out.openTag("filter", Collections.singletonMap("source", holder.getSource().toString()));
        else
            out.openTag("filter");

        String n = holder.getName();
        out.tag("filter-name", n);

        String ot = n + ".filter.";

        if (holder instanceof FilterHolder)
        {
            out.tag("filter-class", origin(md, ot + "filter-class"), holder.getClassName());
            out.tag("async-supported", origin(md, ot + "async-supported"), holder.isAsyncSupported() ? "true" : "false");
        }

        for (String p : holder.getInitParameters().keySet())
        {
            out.openTag("init-param", origin(md, ot + "init-param." + p))
                .tag("param-name", p)
                .tag("param-value", holder.getInitParameter(p))
                .closeTag();
        }

        out.closeTag();
    }

    private void outholder(XmlAppendable out, MetaData md, ServletHolder holder) throws IOException
    {

        if (LOG.isDebugEnabled())
            out.openTag("servlet", Collections.singletonMap("source", holder.getSource().toString()));
        else
            out.openTag("servlet");

        String n = holder.getName();
        out.tag("servlet-name", n);

        String ot = n + ".servlet.";

        ServletHolder s = (ServletHolder)holder;
        if (s.getForcedPath() != null && s.getClassName() == null)
            out.tag("jsp-file", s.getForcedPath());
        else
            out.tag("servlet-class", origin(md, ot + "servlet-class"), s.getClassName());

        for (String p : holder.getInitParameters().keySet())
        {
            if ("jsp".equalsIgnoreCase(n) && "scratchdir".equalsIgnoreCase(p)) //don't preconfigure the temp dir for jsp output
                continue;
            out.openTag("init-param", origin(md, ot + "init-param." + p))
                .tag("param-name", p)
                .tag("param-value", holder.getInitParameter(p))
                .closeTag();
        }

        if (s.getInitOrder() >= 0)
            out.tag("load-on-startup", Integer.toString(s.getInitOrder()));

        if (!s.isEnabled())
            out.tag("enabled", origin(md, ot + "enabled"), "false");

        out.tag("async-supported", origin(md, ot + "async-supported"), holder.isAsyncSupported() ? "true" : "false");

        if (s.getRunAsRole() != null)
            out.openTag("run-as", origin(md, ot + "run-as"))
                .tag("role-name", s.getRunAsRole())
                .closeTag();

        Map<String, String> roles = s.getRoleRefMap();
        if (roles != null)
        {
            for (Map.Entry<String, String> e : roles.entrySet())
            {
                out.openTag("security-role-ref", origin(md, ot + "role-name." + e.getKey()))
                    .tag("role-name", e.getKey())
                    .tag("role-link", e.getValue())
                    .closeTag();
            }
        }

        //multipart-config
        MultipartConfigElement multipartConfig = ((ServletHolder.Registration)s.getRegistration()).getMultipartConfig();
        if (multipartConfig != null)
        {
            out.openTag("multipart-config", origin(md, s.getName() + ".servlet.multipart-config"));
            if (multipartConfig.getLocation() != null)
                out.tag("location", multipartConfig.getLocation());
            out.tag("max-file-size", Long.toString(multipartConfig.getMaxFileSize()));
            out.tag("max-request-size", Long.toString(multipartConfig.getMaxRequestSize()));
            out.tag("file-size-threshold", Long.toString(multipartConfig.getFileSizeThreshold()));
            out.closeTag();
        }

        out.closeTag();
    }

    /**
     * Find the origin (web.xml, fragment, annotation etc) of a web artifact from MetaData.
     *
     * @param md the metadata
     * @param name the name
     * @return the origin map
     */
    public Map<String, String> origin(MetaData md, String name)
    {
        if (StringUtil.isBlank(_originAttribute))
            return Collections.emptyMap();
        if (name == null)
            return Collections.emptyMap();
        OriginInfo origin = md.getOriginInfo(name);
        if (LOG.isDebugEnabled())
            LOG.debug("origin of {} is {}", name, origin);
        if (origin == null)
            return Collections.emptyMap();
        return Collections.singletonMap(_originAttribute, origin.toString() + ":" + (_count++));
    }

    @Override
    public void preConfigure(WebAppContext context) throws Exception
    {
        ExtraXmlDescriptorProcessor extraXmlProcessor = new ExtraXmlDescriptorProcessor();
        extraXmlProcessor.setOriginAttribute(getOriginAttribute());
        context.getMetaData().addDescriptorProcessor(extraXmlProcessor);
        context.setAttribute(ExtraXmlDescriptorProcessor.class.getName(), extraXmlProcessor);
        super.preConfigure(context);
    }

    @Override
    public void configure(WebAppContext context) throws Exception
    {
        MetaData metadata = context.getMetaData();
        metadata.resolve(context);
        try (OutputStream os = Files.newOutputStream(_quickStartWebXml))
        {
            generateQuickStartWebXml(context, os);
            LOG.info("Generated {}", _quickStartWebXml);
            if (context.getAttribute(WebInfConfiguration.TEMPORARY_RESOURCE_BASE) != null && !context.isPersistTempDirectory())
                LOG.warn("Generated to non persistent location: {}", _quickStartWebXml);
        }
    }

    @Override
    public void deconfigure(WebAppContext context) throws Exception
    {
        super.deconfigure(context);
    }

}
