Java tutorial
/* * JasperReports - Free Java Reporting Library. * Copyright (C) 2001 - 2019 TIBCO Software Inc. All rights reserved. * http://www.jaspersoft.com * * Unless you have purchased a commercial license agreement from Jaspersoft, * the following license terms apply: * * This program is part of JasperReports. * * JasperReports is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * JasperReports is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with JasperReports. If not, see <http://www.gnu.org/licenses/>. */ package net.sf.jasperreports.repo; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.file.Path; import java.nio.file.Paths; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import net.sf.jasperreports.engine.JRRuntimeException; import net.sf.jasperreports.engine.JasperReportsContext; import net.sf.jasperreports.engine.util.JRResourcesUtil; /** * @author Teodor Danciu (teodord@users.sourceforge.net) */ public class FileRepositoryService implements StreamRepositoryService { private static final Log log = LogFactory.getLog(FileRepositoryService.class); public static final String EXCEPTION_MESSAGE_KEY_NOT_IMPLEMENTED = "repo.file.not.implemented"; private JasperReportsContext jasperReportsContext; private String root; private boolean resolveAbsolutePath;//FIXMEREPO consider giving up on this private volatile Path rootNormalizedPath; private Path rootRealPath; /** * */ public FileRepositoryService(JasperReportsContext jasperReportsContext, String root, boolean resolveAbsolutePath) { this.jasperReportsContext = jasperReportsContext; this.root = root; this.resolveAbsolutePath = resolveAbsolutePath; setRootRealPath(); } /** * */ public void setRoot(String root) { this.root = root; setRootRealPath(); } /** * */ public String getRoot() { return root; } protected Path rootNormalizedPath() { Path rootPath = rootNormalizedPath; if (rootPath == null) { Path path = Paths.get(root); rootPath = rootNormalizedPath = path.normalize(); } return rootPath; } @Override public InputStream getInputStream(String uri) { return getInputStream(SimpleRepositoryContext.of(jasperReportsContext), uri); } public File getFile(RepositoryContext context, String uri) { File file = null; if (uri != null) { file = JRResourcesUtil.resolveFile(context, uri, this::locateFile); if (file != null && !file.isFile()) { file = null; } } return file; } @Override public InputStream getInputStream(RepositoryContext context, String uri) { InputStream is = null; File file = getFile(context, uri); if (file != null) { try { is = new FileInputStream(file); } catch (IOException e) { throw new JRRuntimeException(e); } } return is; } protected File locateFile(String location) { File file = new File(getRoot(), location); if (file.exists()) { //checking that syntactically the requested path is still inside the root //we are not dealing with symlinks/real paths for now Path rootPath = rootNormalizedPath(); Path filePath = file.toPath().normalize(); if (!filePath.startsWith(rootPath)) { log.warn("Requested path " + location + " normalized to " + filePath + ", which falls outside repository root path " + rootPath); file = null; } } else { if (resolveAbsolutePath) { file = new File(location); if (!file.exists()) { file = null; } } else { file = null; } } return file; } @Override public OutputStream getOutputStream(String uri) { File file = null; if (uri != null) { file = new File(getRoot(), uri); } OutputStream os = null; if (file != null) { try { os = new FileOutputStream(file); } catch (IOException e) { throw new JRRuntimeException(e); } } return os; } @Override public Resource getResource(String uri) { throw new JRRuntimeException(EXCEPTION_MESSAGE_KEY_NOT_IMPLEMENTED, (Object[]) null);//FIXMEREPO } @Override public void saveResource(String uri, Resource resource) { PersistenceService persistenceService = PersistenceUtil.getInstance(jasperReportsContext) .getService(FileRepositoryService.class, resource.getClass()); if (persistenceService != null) { persistenceService.save(resource, uri, this); } } @Override public <K extends Resource> K getResource(String uri, Class<K> resourceType) { return getResource(SimpleRepositoryContext.of(jasperReportsContext), uri, resourceType); } @Override public <K extends Resource> K getResource(RepositoryContext context, String uri, Class<K> resourceType) { PersistenceService persistenceService = PersistenceUtil.getInstance(jasperReportsContext) .getService(FileRepositoryService.class, resourceType); if (persistenceService != null) { return (K) persistenceService.load(context, uri, this); } return null; } private void setRootRealPath() { Path path = Paths.get(root); try { rootRealPath = path.toRealPath(); } catch (IOException e) { log.warn("Failed to resolve real path for root " + root, e); rootRealPath = null; } } @Override public ResourceInfo getResourceInfo(RepositoryContext context, String location) { File file = getFile(context, location); if (file != null) { try { Path filePath = file.toPath().toRealPath(); if (rootRealPath != null && filePath.startsWith(rootRealPath)) { Path relativePath = rootRealPath.relativize(filePath); return StandardResourceInfo.from(relativePath); } else if (resolveAbsolutePath) { return StandardResourceInfo.from(filePath); } } catch (IOException e) { log.warn("Failed to resolve real path for file " + file, e); } } return null; } }