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Core ACS AEM Commons OSGi Bundle. Includes commons utilities.
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/*
 * #%L
 * ACS AEM Commons Bundle
 * %%
 * Copyright (C) 2019 Adobe
 * %%
 * Licensed 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.
 * #L%
 */
package com.adobe.acs.commons.util;

import com.adobe.acs.commons.util.impl.Activator;
import com.adobe.cq.sightly.WCMBindings;
import com.day.cq.wcm.api.Page;
import com.day.cq.wcm.api.PageManager;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.adapter.AdapterManager;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.scripting.SlingBindings;
import org.apache.sling.api.wrappers.SlingHttpServletRequestWrapper;
import org.apache.sling.scripting.api.AbstractScriptEngineFactory;
import org.apache.sling.scripting.api.BindingsValuesProvider;
import org.apache.sling.scripting.api.BindingsValuesProvidersByContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.SimpleBindings;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Request wrapper to get the Resource and SlingBindings objects for a request scoped to a specified path.
 *
 * Among other things, this enables injection of sling models from a SlingHttpServletRequest
 * object rather than simply a Resource, which is required by some sling models for full
 * functionality.
 */
public class OverridePathSlingRequestWrapper extends SlingHttpServletRequestWrapper {
    private static final String ATTR_SLING_BINDINGS = SlingBindings.class.getName();
    private static final Logger LOG = LoggerFactory.getLogger(OverridePathSlingRequestWrapper.class);

    private final SlingBindings myBindings = new SlingBindings();
    private final Resource resource;

    private final Map, Object> adaptersCache = new HashMap<>();

    /**
     * Constructor for generic request wrapper.
     *
     * @param request A valid sling request.
     * @param path    Path to represent by this request wrapper.
     */
    public OverridePathSlingRequestWrapper(final SlingHttpServletRequest request, final String path) {
        super(request);

        SlingBindings slingBindings = (SlingBindings) getSlingRequest().getAttribute(ATTR_SLING_BINDINGS);

        // Using `resolve` instead of `getResource` in order to support requests to non-existent resources
        this.resource = getSlingRequest().getResourceResolver().resolve(getSlingRequest(), path);

        if (slingBindings != null) {
            this.myBindings.putAll(slingBindings);
        }
        this.myBindings.put(WCMBindings.PROPERTIES, this.resource.getValueMap());
        this.myBindings.put(SlingBindings.RESOURCE, this.resource);
        this.myBindings.put(SlingBindings.REQUEST, this);
        this.myBindings.put(SlingBindings.RESOLVER, this.resource.getResourceResolver());

        Page currentPage = null;
        PageManager pageManager = getSlingRequest().getResourceResolver().adaptTo(PageManager.class);
        if (pageManager != null) {
            currentPage = pageManager.getContainingPage(this.resource);
        }
        this.myBindings.put(WCMBindings.CURRENT_PAGE, currentPage);
    }

    /**
     * Constructor for request wrapper to be used for sling model injection.
     *
     * Ensures the wrapped request is created with all standard sling model bindings.
     *
     * @param request                          A valid sling request.
     * @param path                             Path to represent by this request wrapper.
     * @param bindingsValuesProvidersByContext Service reference to list of bindings providers.
     */
    public OverridePathSlingRequestWrapper(final SlingHttpServletRequest request, final String path, BindingsValuesProvidersByContext bindingsValuesProvidersByContext) {
        this(request, path);

        SimpleBindings additionalBindings = new SimpleBindings();
        additionalBindings.putAll(this.myBindings);

        Collection bindingsValuesProviders = bindingsValuesProvidersByContext.getBindingsValuesProviders(new SlingModelsScriptEngineFactory(), "request");
        Iterator bindingsValuesProviderIterator = bindingsValuesProviders.iterator();
        while (bindingsValuesProviderIterator.hasNext()) {
            BindingsValuesProvider provider = bindingsValuesProviderIterator.next();
            provider.addBindings(additionalBindings);
        }
        this.myBindings.putAll(additionalBindings);
    }

    @Override
    public Object getAttribute(final String name) {
        if (ATTR_SLING_BINDINGS.equals(name)) {
            return this.myBindings;
        } else {
            return super.getAttribute(name);
        }
    }

    @Override
    public Resource getResource() {
        return this.resource;
    }

    /**
     * Overriding `adaptTo` to avoid using the original request as the adaptable.
     */
    @Override
    public  AdapterType adaptTo(Class type) {
        AdapterType result = null;
        synchronized(this) {
            result = (AdapterType) this.adaptersCache.get(type);

            if (result == null) {
                AdapterManager mgr = Activator.getAdapterManager();
                if (mgr == null) {
                    LOG.warn("Unable to adapt request for path {} to {} because AdapterManager is null", this.resource.getPath(), type);
                } else {
                    result = mgr.getAdapter(this, type);
                }
                if (result != null) {
                    this.adaptersCache.put(type, result);
                }
            }

            return result;
        }
    }

    private static class SlingModelsScriptEngineFactory extends AbstractScriptEngineFactory implements ScriptEngineFactory {
        SlingModelsScriptEngineFactory() {
            this.setNames(new String[]{"sling-models-exporter", "sling-models"});
        }

        public String getLanguageName() {
            return null;
        }

        public String getLanguageVersion() {
            return null;
        }

        public ScriptEngine getScriptEngine() {
            return null;
        }
    }
}