| /******************************************************************************* |
| * 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.sling.scripting.sightly.impl.engine.extension.use; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Modifier; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import javax.script.Bindings; |
| import javax.servlet.ServletRequest; |
| |
| import org.apache.sling.api.SlingHttpServletRequest; |
| import org.apache.sling.api.adapter.Adaptable; |
| import org.apache.sling.api.resource.Resource; |
| import org.apache.sling.api.scripting.SlingScriptHelper; |
| import org.apache.sling.scripting.sightly.impl.engine.compiled.SlingHTLMasterCompiler; |
| import org.apache.sling.scripting.sightly.impl.engine.precompiled.PrecompiledUnitManager; |
| import org.apache.sling.scripting.sightly.impl.utils.BindingsUtils; |
| import org.apache.sling.scripting.sightly.impl.utils.Patterns; |
| import org.apache.sling.scripting.sightly.pojo.Use; |
| import org.apache.sling.scripting.sightly.render.RenderContext; |
| import org.apache.sling.scripting.sightly.use.ProviderOutcome; |
| import org.apache.sling.scripting.sightly.use.UseProvider; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| import org.osgi.framework.Constants; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.component.annotations.ReferenceCardinality; |
| import org.osgi.service.component.annotations.ReferencePolicyOption; |
| import org.osgi.service.metatype.annotations.AttributeDefinition; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Component( |
| service = UseProvider.class, |
| configurationPid = "org.apache.sling.scripting.sightly.impl.engine.extension.use.JavaUseProvider", |
| property = { |
| Constants.SERVICE_RANKING + ":Integer=90" |
| } |
| ) |
| public class JavaUseProvider implements UseProvider { |
| |
| @interface Configuration { |
| |
| @AttributeDefinition( |
| name = "Service Ranking", |
| description = "The Service Ranking value acts as the priority with which this Use Provider is queried to return an " + |
| "Use-object. A higher value represents a higher priority." |
| ) |
| int service_ranking() default 90; |
| |
| } |
| |
| private static final String ADAPTABLE = "adaptable"; |
| private static final Logger LOG = LoggerFactory.getLogger(JavaUseProvider.class); |
| |
| @Reference(cardinality = ReferenceCardinality.OPTIONAL, policyOption = ReferencePolicyOption.GREEDY) |
| private SlingHTLMasterCompiler slingHTLMasterCompiler; |
| |
| @Reference(cardinality = ReferenceCardinality.OPTIONAL, policyOption = ReferencePolicyOption.GREEDY) |
| private PrecompiledUnitManager precompiledUnitManager; |
| |
| @Override |
| public ProviderOutcome provide(String identifier, RenderContext renderContext, Bindings arguments) { |
| if (!Patterns.JAVA_CLASS_NAME.matcher(identifier).matches()) { |
| LOG.debug("Identifier {} does not match a Java class name pattern.", identifier); |
| return ProviderOutcome.failure(); |
| } |
| Bindings globalBindings = renderContext.getBindings(); |
| SlingHttpServletRequest request = BindingsUtils.getRequest(globalBindings); |
| Map<String, Object> overrides = setRequestAttributes(request, arguments); |
| |
| try { |
| Exception failure = null; |
| if (precompiledUnitManager != null) { |
| ClassLoader unitClassLoader = precompiledUnitManager.getBundledRenderUnitClassloader(globalBindings); |
| if (unitClassLoader != null) { |
| try { |
| Class<?> clazz = unitClassLoader.loadClass(identifier); |
| return loadObject(clazz, cls -> precompiledUnitManager.getServiceForBundledRenderUnit(globalBindings, clazz), |
| globalBindings, |
| arguments); |
| } catch (Exception e) { |
| // maybe the class will actually come from the repository |
| failure = e; |
| } |
| } |
| } |
| if (slingHTLMasterCompiler != null) { |
| Object result = slingHTLMasterCompiler.getResourceBackedUseObject(renderContext, identifier); |
| if (result != null) { |
| if (result instanceof Use) { |
| ((Use) result).init(BindingsUtils.merge(globalBindings, arguments)); |
| } |
| return ProviderOutcome.success(result); |
| } else { |
| SlingScriptHelper slingScriptHelper = BindingsUtils.getHelper(globalBindings); |
| if (slingScriptHelper != null) { |
| try { |
| Class<?> clazz = slingHTLMasterCompiler.getClassLoader().loadClass(identifier); |
| return loadObject(clazz, slingScriptHelper::getService, globalBindings, arguments); |
| } catch (Exception e) { |
| failure = e; |
| } |
| } |
| } |
| |
| } |
| if (failure != null) { |
| return ProviderOutcome.failure(failure); |
| } |
| return ProviderOutcome.failure(); |
| } catch (Exception e) { |
| // any other exception is an error |
| return ProviderOutcome.failure(e); |
| } finally { |
| resetRequestAttribute(request, overrides); |
| } |
| } |
| |
| private ProviderOutcome loadObject(@NotNull Class<?> cls, @NotNull ServiceLoader serviceLoader, @NotNull Bindings globalBindings, |
| @NotNull Bindings arguments) |
| throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, |
| InstantiationException { |
| // attempt OSGi service load |
| Object result = serviceLoader.getService(cls); |
| if (result != null) { |
| return ProviderOutcome.success(result); |
| } |
| Object adaptableCandidate = arguments.get(ADAPTABLE); |
| if (adaptableCandidate instanceof Adaptable) { |
| Adaptable adaptable = (Adaptable) adaptableCandidate; |
| result = adaptable.adaptTo(cls); |
| if (result != null) { |
| return ProviderOutcome.success(result); |
| } |
| } |
| SlingHttpServletRequest request = BindingsUtils.getRequest(globalBindings); |
| if (request != null) { |
| result = request.adaptTo(cls); |
| } |
| if (result == null) { |
| Resource resource = BindingsUtils.getResource(globalBindings); |
| if (resource != null) { |
| result = resource.adaptTo(cls); |
| } |
| } |
| if (result != null) { |
| return ProviderOutcome.success(result); |
| } else if (cls.isInterface() || Modifier.isAbstract(cls.getModifiers())) { |
| LOG.debug("Won't attempt to instantiate an interface or abstract class {}", cls.getName()); |
| return ProviderOutcome.failure(); |
| } else { |
| /* |
| * the object was cached by the class loader but it's not adaptable from {@link Resource} or {@link |
| * SlingHttpServletRequest}; attempt to load it like a regular POJO that optionally could implement {@link Use} |
| */ |
| result = cls.getDeclaredConstructor().newInstance(); |
| if (result instanceof Use) { |
| ((Use) result).init(BindingsUtils.merge(globalBindings, arguments)); |
| } |
| return ProviderOutcome.notNullOrFailure(result); |
| } |
| } |
| |
| private Map<String, Object> setRequestAttributes(ServletRequest request, Bindings arguments) { |
| Map<String, Object> overrides = new HashMap<>(); |
| for (Map.Entry<String, Object> entry : arguments.entrySet()) { |
| String key = entry.getKey(); |
| Object value = entry.getValue(); |
| Object oldValue = request.getAttribute(key); |
| if (oldValue != null) { |
| overrides.put(key, oldValue); |
| } else { |
| overrides.put(key, NULL); |
| } |
| request.setAttribute(key, value); |
| } |
| return overrides; |
| } |
| |
| private void resetRequestAttribute(ServletRequest request, Map<String, Object> overrides) { |
| for (Map.Entry<String, Object> entry : overrides.entrySet()) { |
| String key = entry.getKey(); |
| Object value = entry.getValue(); |
| if (value == NULL) { |
| request.removeAttribute(key); |
| } else { |
| request.setAttribute(key, value); |
| } |
| } |
| } |
| |
| private static final Object NULL = new Object(); |
| |
| private interface ServiceLoader { |
| @Nullable Object getService(Class<?> cls); |
| } |
| } |