Java tutorial
/** * Licensed to the Sakai Foundation (SF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The SF 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.sakaiproject.nakamura.files.pool; import org.apache.commons.lang.StringUtils; import org.apache.felix.scr.annotations.Component; import org.apache.felix.scr.annotations.Service; import org.apache.sling.api.SlingHttpServletRequest; import org.apache.sling.api.SlingHttpServletResponse; import org.apache.sling.api.request.RequestPathInfo; import org.apache.sling.api.resource.Resource; import org.apache.sling.api.servlets.SlingSafeMethodsServlet; import org.apache.sling.commons.json.JSONException; import org.apache.sling.commons.json.JSONObject; import org.sakaiproject.nakamura.api.files.FilesConstants; import org.sakaiproject.nakamura.api.http.usercontent.ServerProtectionVeto; import org.sakaiproject.nakamura.api.lite.StorageClientException; import org.sakaiproject.nakamura.api.lite.StorageClientUtils; import org.sakaiproject.nakamura.api.lite.accesscontrol.AccessDeniedException; import org.sakaiproject.nakamura.api.lite.content.Content; import org.sakaiproject.nakamura.api.lite.content.ContentManager; import org.sakaiproject.nakamura.util.ExtendedJSONWriter; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServletResponse; @Service({ ServerProtectionVeto.class, DefaultServletDelegate.class }) @Component(immediate = true, enabled = true, metatype = true) public class GetPoolStructureServlet extends SlingSafeMethodsServlet implements DefaultServletDelegate, ServerProtectionVeto { /** * */ private static final long serialVersionUID = 6091033560662167157L; private static final Logger LOGGER = LoggerFactory.getLogger(GetPoolStructureServlet.class); public void doDelegateGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException { doGet(request, response); } @Override protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException { try { Resource resource = request.getResource(); Content content = resource.adaptTo(Content.class); ContentManager contentManager = resource.adaptTo(ContentManager.class); String resourceId = getResourceId(request, content); if (resourceId != null) { String resourcePath = StorageClientUtils.newPath(content.getPath(), resourceId); Content resourceContent = contentManager.get(resourcePath); if (resourceContent != null) { if (contentManager.hasBody(resourcePath, null)) { LOGGER.debug("Getting Resource Path {} Has Body", resourcePath); StreamHelper streamHelper = new StreamHelper(); ServletContext sc = null; try { sc = getServletContext(); } catch (IllegalStateException e) { LOGGER.debug(e.getMessage(), e); } streamHelper.stream(request, contentManager, resourceContent, null, response, resource, sc); } else { LOGGER.debug("Getting Resource Path {} No Body", resourcePath); response.setContentType("application/json"); response.setCharacterEncoding("UTF-8"); ExtendedJSONWriter writer = new ExtendedJSONWriter(response.getWriter()); ExtendedJSONWriter.writeContentTreeToWriter(writer, resourceContent, false, 0); } } else { response.sendError(HttpServletResponse.SC_NOT_FOUND); } } } catch (JSONException e) { LOGGER.warn(e.getMessage(), e); throw new ServletException(e.getMessage(), e); } catch (StorageClientException e) { LOGGER.warn(e.getMessage(), e); throw new ServletException(e.getMessage(), e); } catch (AccessDeniedException e) { response.sendError(HttpServletResponse.SC_NOT_FOUND); } } public boolean accepts(SlingHttpServletRequest request) { if (request != null) { Resource resource = request.getResource(); if (resource != null) { Content content = resource.adaptTo(Content.class); if (content != null) { String contentPathInfo = getContentPathInfo(request, content); LOGGER.debug("Content Path Info is {} ", contentPathInfo); if (contentPathInfo != null && contentPathInfo.length() > 0) { String[] contentPathInfoSplit = StringUtils.split(contentPathInfo, "/", 2); if (contentPathInfoSplit.length > 0) { String structureId = FilesConstants.STRUCTURE_FIELD_STEM + contentPathInfoSplit[0]; if (content.hasProperty(structureId)) { return content.getProperty(structureId) != null; } } } } } } return false; } private String getContentPathInfo(SlingHttpServletRequest request, Content content) { RequestPathInfo requestPathInfo = request.getRequestPathInfo(); LOGGER.debug("RequestPath Info is {} {}", requestPathInfo); String requestPath = requestPathInfo.getResourcePath(); String contentPath = content.getPath(); LOGGER.debug("RequestPath {} Content Path is {}", requestPath, contentPath); int i = requestPath.indexOf(contentPath); String contentPathInfo = ""; if (i > 0) { contentPathInfo = requestPath.substring(i + contentPath.length()); } return contentPathInfo; } /** * Get the resource ID from the request * @param srequest * @param content * @return * @throws JSONException */ private String getResourceId(SlingHttpServletRequest srequest, Content content) throws JSONException { String contentPathInfo = getContentPathInfo(srequest, content); if (contentPathInfo == null || contentPathInfo.length() == 0) { return null; } String[] path = StringUtils.split(contentPathInfo, "/"); if (!content.hasProperty(FilesConstants.STRUCTURE_FIELD_STEM + path[0])) { return null; } JSONObject structure = new JSONObject( (String) content.getProperty(FilesConstants.STRUCTURE_FIELD_STEM + path[0])); for (int i = 1; i < path.length; i++) { structure = structure.getJSONObject(path[i]); LOGGER.debug("Got {} at {} ", structure, path[i]); if (structure == null) { return null; } } if (structure.has(FilesConstants.RESOURCE_REFERENCE_FIELD)) { return structure.getString(FilesConstants.RESOURCE_REFERENCE_FIELD); } else { return null; } } public boolean willVeto(SlingHttpServletRequest srequest) { if (srequest != null) { Resource resource = srequest.getResource(); if (resource != null) { if (FilesConstants.POOLED_CONTENT_RT.equals(resource.getResourceType()) || FilesConstants.POOLED_CONTENT_RT.equals(resource.getResourceSuperType())) { if (accepts(srequest)) { LOGGER.debug("Will Veto this request"); return true; } } else { LOGGER.debug("No Veto, No the right resource type {}", resource.getResourceType()); } } else { LOGGER.debug("No Veto, No resource"); } } else { LOGGER.debug("No Veto, No request"); } return false; } public boolean safeToStream(SlingHttpServletRequest srequest) { if (srequest != null) { Resource resource = srequest.getResource(); if (resource != null) { if (FilesConstants.POOLED_CONTENT_RT.equals(resource.getResourceType()) || FilesConstants.POOLED_CONTENT_RT.equals(resource.getResourceSuperType())) { try { if (accepts(srequest)) { Content content = resource.adaptTo(Content.class); LOGGER.debug("Content is {} ", content); if (content != null) { ContentManager contentManager = resource.adaptTo(ContentManager.class); String resourceId = getResourceId(srequest, content); LOGGER.debug("Resource ID is {} ", resourceId); if (resourceId != null) { return !contentManager.hasBody( StorageClientUtils.newPath(content.getPath(), resourceId), null); } else { LOGGER.debug("No Resource ID found"); } } } else { LOGGER.debug("Doesnt accept, so safe to stream"); return true; } } catch (JSONException e) { LOGGER.warn(e.getMessage(), e); } catch (StorageClientException e) { LOGGER.warn(e.getMessage(), e); } catch (AccessDeniedException e) { LOGGER.warn(e.getMessage(), e); } LOGGER.debug("Not Safe to stream for some reason"); return false; } else { LOGGER.debug("Resource is not of correct type {} ", resource.getResourceType()); } } else { LOGGER.debug("Resource is null"); } } return true; } }