| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.knox.gateway.filter.rewrite.impl.xml; |
| |
| import org.apache.commons.beanutils.BeanUtils; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterBufferDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterContentDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterGroupDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterPathDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterScopeDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFlowDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFunctionDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteRuleDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteRulesDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteStepDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.i18n.UrlRewriteMessages; |
| import org.apache.knox.gateway.filter.rewrite.spi.UrlRewriteRulesExporter; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterApplyDescriptor; |
| import org.apache.knox.gateway.filter.rewrite.api.UrlRewriteFilterDetectDescriptor; |
| import org.apache.knox.gateway.i18n.messages.MessagesFactory; |
| import org.apache.knox.gateway.util.XmlUtils; |
| import org.w3c.dom.Attr; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Element; |
| |
| import javax.xml.parsers.ParserConfigurationException; |
| import javax.xml.transform.TransformerException; |
| import java.beans.BeanInfo; |
| import java.beans.IntrospectionException; |
| import java.beans.Introspector; |
| import java.beans.PropertyDescriptor; |
| import java.io.IOException; |
| import java.io.Writer; |
| import java.lang.reflect.InvocationTargetException; |
| |
| public class XmlUrlRewriteRulesExporter implements UrlRewriteRulesExporter, XmlRewriteRulesTags { |
| |
| private static final UrlRewriteMessages LOG = MessagesFactory.get( UrlRewriteMessages.class ); |
| |
| @Override |
| public String getFormat() { |
| return "xml"; |
| } |
| |
| @Override |
| public Object store(UrlRewriteRulesDescriptor descriptor, Writer writer) throws IOException { |
| return store(descriptor, writer, false); |
| } |
| |
| public Object store( UrlRewriteRulesDescriptor descriptor, Writer writer, boolean omitXmlHeader ) throws IOException { |
| try { |
| Document document = XmlUtils.createDocument(); |
| |
| Element root = document.createElement( ROOT ); |
| document.appendChild( root ); |
| |
| if( !descriptor.getFunctions().isEmpty() ) { |
| Element functionsElement = document.createElement( FUNCTIONS ); |
| root.appendChild( functionsElement ); |
| for( UrlRewriteFunctionDescriptor function : descriptor.getFunctions() ) { |
| Element functionElement = createElement( document, function.name(), function ); |
| functionsElement.appendChild( functionElement ); |
| } |
| } |
| |
| if( !descriptor.getRules().isEmpty() ) { |
| for( UrlRewriteRuleDescriptor rule : descriptor.getRules() ) { |
| Element ruleElement = createRule( document, rule ); |
| root.appendChild( ruleElement ); |
| } |
| } |
| |
| if( !descriptor.getFilters().isEmpty() ) { |
| for( UrlRewriteFilterDescriptor filter : descriptor.getFilters() ) { |
| Element filterElement = createFilter( document, filter ); |
| root.appendChild( filterElement ); |
| } |
| } |
| |
| XmlUtils.writeXml( document, writer, omitXmlHeader); |
| |
| return document; |
| |
| } catch( ParserConfigurationException | TransformerException e ) { |
| throw new IOException( e ); |
| } catch( InvocationTargetException | IllegalAccessException | IntrospectionException | NoSuchMethodException e ) { |
| LOG.failedToWriteRulesDescriptor( e ); |
| return null; |
| } |
| } |
| |
| private Element createFilter( Document document, UrlRewriteFilterDescriptor parent ) |
| throws IntrospectionException, InvocationTargetException, NoSuchMethodException, IllegalAccessException { |
| Element parentElement = createElement( document, FILTER, parent ); |
| for( UrlRewriteFilterContentDescriptor child: parent.getContents() ) { |
| Element childElement = createFilterContent( document, child ); |
| parentElement.appendChild( childElement ); |
| } |
| return parentElement; |
| } |
| |
| private Element createFilterContent( Document document, UrlRewriteFilterContentDescriptor parent ) |
| throws IntrospectionException, InvocationTargetException, NoSuchMethodException, IllegalAccessException { |
| Element parentElement = createElement( document, CONTENT, parent ); |
| for( UrlRewriteFilterPathDescriptor child: parent.getSelectors() ) { |
| Element childElement = createFilterSelector( document, child ); |
| parentElement.appendChild( childElement ); |
| } |
| return parentElement; |
| } |
| |
| private Element createFilterSelector( Document document, UrlRewriteFilterPathDescriptor parent ) |
| throws IntrospectionException, InvocationTargetException, NoSuchMethodException, IllegalAccessException { |
| Element parentElement = createElement( document, toTagName( parent ), parent ); |
| if( parent instanceof UrlRewriteFilterGroupDescriptor) { |
| for( UrlRewriteFilterPathDescriptor child: ((UrlRewriteFilterGroupDescriptor)parent).getSelectors() ) { |
| Element childElement = createFilterSelector( document, child ); |
| parentElement.appendChild( childElement ); |
| } |
| } |
| return parentElement; |
| } |
| |
| private Element createRule( Document document, UrlRewriteRuleDescriptor rule ) |
| throws IntrospectionException, InvocationTargetException, NoSuchMethodException, IllegalAccessException { |
| Element ruleElement = createElement( document, RULE, rule ); |
| for( UrlRewriteStepDescriptor step: rule.steps() ) { |
| Element childElement = createStep( document, step ); |
| ruleElement.appendChild( childElement ); |
| } |
| return ruleElement; |
| } |
| |
| private Element createStep( Document document, UrlRewriteStepDescriptor step ) |
| throws IntrospectionException, InvocationTargetException, NoSuchMethodException, IllegalAccessException { |
| Element parentElement = createElement( document, step.type(), step ); |
| if( step instanceof UrlRewriteFlowDescriptor) { |
| UrlRewriteFlowDescriptor flow = (UrlRewriteFlowDescriptor)step; |
| for( Object child: flow.steps() ) { |
| UrlRewriteStepDescriptor childStep = (UrlRewriteStepDescriptor)child; |
| Element childElement = createStep( document, childStep ); |
| parentElement.appendChild( childElement ); |
| } |
| |
| } |
| return parentElement; |
| } |
| |
| private Element createElement( Document document, String name, Object bean ) |
| throws IntrospectionException, InvocationTargetException, NoSuchMethodException, IllegalAccessException { |
| Element element = document.createElement( name ); |
| BeanInfo beanInfo = Introspector.getBeanInfo( bean.getClass(), Object.class ); |
| for( PropertyDescriptor propInfo: beanInfo.getPropertyDescriptors() ) { |
| String propName = propInfo.getName(); |
| if( propInfo.getReadMethod() != null && String.class.isAssignableFrom( propInfo.getPropertyType() ) ) { |
| String propValue = BeanUtils.getProperty( bean, propName ); |
| if( propValue != null && !propValue.isEmpty() ) { |
| // Doing it the hard way to avoid having the &'s in the query string escaped at & |
| Attr attr = document.createAttribute( propName ); |
| attr.setValue( propValue ); |
| element.setAttributeNode( attr ); |
| //element.setAttribute( propName, propValue ); |
| } |
| } |
| } |
| return element; |
| } |
| |
| private static String toTagName( final UrlRewriteFilterPathDescriptor descriptor ) { |
| if( descriptor instanceof UrlRewriteFilterApplyDescriptor) { |
| return APPLY; |
| } else if( descriptor instanceof UrlRewriteFilterDetectDescriptor) { |
| return DETECT; |
| } else if( descriptor instanceof UrlRewriteFilterBufferDescriptor) { |
| return BUFFER; |
| } else if( descriptor instanceof UrlRewriteFilterScopeDescriptor) { |
| return SCOPE; |
| } else { |
| throw new IllegalArgumentException(); |
| } |
| } |
| |
| } |