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/**
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* Copyright (C) 2017 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.config;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.util.Properties;
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import org.apache.log4j.Logger;
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import org.springframework.context.EnvironmentAware;
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import org.springframework.core.env.Environment;
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/**
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* Utility class for consistent access to and creation of per instance application configuration files.
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*
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* @author a.mueller
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* @author a.kohlbecker
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*/
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public class ConfigFileUtil implements EnvironmentAware {
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private static final Logger logger = Logger.getLogger(ConfigFileUtil.class);
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private static String userHome = null;
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/**
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* The per user cdm folder name: ".cdmLibrary"
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*/
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private static final String CDM_FOLDER_NAME = ".cdmLibrary";
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/**
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* The per user cdm folder "~/.cdmLibrary"
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*/
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private static File perUserCdmFolder = null;
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public static File perUserCdmFolder() {
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return perUserCdmFolder;
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}
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/**
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* Provides the <code>${user.home}./cdmLibrary</code> folder without taking
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* additional property sources into account which could be configured in
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* the Spring application context.
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* <p>
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* This method can be used if an application context is not (yet) available, but
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* should be used with caution, since this location might differ from the location
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* used by other components of the application which make use of the
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* {@link #perUserCdmFolder()} method.
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*
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* @deprecated Marked as deprecated as warning sign in the hope developers will
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* read the java doc for this method when using it.
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*
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*/
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@Deprecated
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public static File perUserCdmFolderFallback() {
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return new File(System.getProperty("user.home"), CDM_FOLDER_NAME);
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}
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/**
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* suggested sub folder for web app related data and configurations.
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* Each webapp instance should use a dedicated subfolder or file
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* which is named by the data source bean id.
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*/
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public static final String SUBFOLDER_WEBAPP = "remote-webapp";
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protected Environment env;
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@Override
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public void setEnvironment(Environment environment) {
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this.env = environment;
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if(userHome == null){
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ConfigFileUtil.userHome = env.getRequiredProperty("user.home");
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ConfigFileUtil.perUserCdmFolder = new File(userHome + File.separator + CDM_FOLDER_NAME );
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logger.info("user.home is set to " + ConfigFileUtil.userHome);
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}
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}
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public static File getCdmHomeDir() {
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return perUserCdmFolder;
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}
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@Deprecated
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public static File getCdmHomeDirFallback() {
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return new File(perUserCdmFolder, CDM_FOLDER_NAME);
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}
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/**
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* Returns specified the sub folder of {@link #CDM_FOLDER_NAME}.
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* If the sub folder does not exist it will be created.
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*
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* @param subFolderName
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* @return the sub folder or null in case the folder did not exist ant the attempt to create it has failed.
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*
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* @see {@link #SUBFOLDER_WEBAPP}
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*/
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public static File getCdmHomeSubDir(String subFolderName) {
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try{
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File parentFolder = getCdmHomeDir();
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return ensureSubfolderExists(parentFolder, subFolderName);
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}catch(Exception e){
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File parentFolder = perUserCdmFolderFallback();
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return ensureSubfolderExists(parentFolder, subFolderName);
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}
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}
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/**
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* Returns an instance specific folder folder in {@link #CDM_FOLDER_NAME}/<code>subFolderName</code>
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* Non existing folders will be created.
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*
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* @param subFolderName
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* The name of a subfolded. In most cases this will be {@link #SUBFOLDER_WEBAPP}
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* @param instanceName
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* The name of the application instance. The name should be related to the data source id.
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* @return the sub folder or null in case the folder did not exist ant the attempt to create it has failed.
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*
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* @see {@link #SUBFOLDER_WEBAPP}
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*/
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public static File getCdmInstanceSubDir(String subFolderName, String instanceName) {
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File subfolder = ensureSubfolderExists(getCdmHomeDir(), subFolderName);
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return ensureSubfolderExists(subfolder, instanceName);
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}
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/**
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* @param subFolderName
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* @param parentFolder
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* @return
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*/
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private static File ensureSubfolderExists(File parentFolder, String subFolderName) {
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if (!parentFolder.exists()){
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if (!parentFolder.mkdir()) {
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throw new RuntimeException("Parent folder could not be created: " + parentFolder.getAbsolutePath());
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}
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}
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File subfolder = new File(parentFolder, subFolderName);
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// if the directory does not exist, create it
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if (!subfolder.exists()) {
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if (!subfolder.mkdir()) {
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throw new RuntimeException("Subfolder could not be created: " + subfolder.getAbsolutePath());
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}
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}
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return subfolder;
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}
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public static final String CDM_CONFIGFILE_OVERRIDE = "cdm.configfile.override.";
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private Properties props = null;
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private String defaultContent = "";
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public ConfigFileUtil(){
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super();
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}
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public ConfigFileUtil setDefaultContent(String content) {
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if(content != null){
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defaultContent = content;
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}
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return this;
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}
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/**
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* Per default the <code>propertiesSet</code> is loaded from a file located in
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* <code>~/.cdmLibrary/remote-webapp/{instanceName}/{propertiesSet}.properties</code>.
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* <p>
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* This behavior can be overwritten by setting the java System property
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* <code>cdm.configfile.override.{propertiesSet}</code> to an alternative file location.
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* This mechanism should only be used for unit and integration tests.
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*
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* @param instanceName the name of the cdm instance. This value can be retrieved from the
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* Spring environment with the key DataSourceConfigurer.CDM_DATA_SOURCE_ID ("")
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* @param propertiesSet
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* The base name of the properties file to be loaded. This name is extended with
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* ".properties" to form the actual filename
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*
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* @return
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* The file containing the properties
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*/
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public File getPropertiesFile(String instanceName, String propertiesSet) {
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if(propertiesSet == null){
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throw new NullPointerException();
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}
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String override = System.getProperty(CDM_CONFIGFILE_OVERRIDE + propertiesSet);
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if(override != null){
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return new File(override);
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} else {
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File configFolder = ConfigFileUtil.getCdmInstanceSubDir(ConfigFileUtil.SUBFOLDER_WEBAPP, instanceName);
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return new File(configFolder, propertiesSet + ".properties");
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}
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}
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/**
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* Per default the <code>propertiesSet</code> is loaded from a file located in
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* <code>~/.cdmLibrary/remote-webapp/{instanceName}/{propertiesSet}.properties</code>.
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* <p>
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* This behavior can be overwritten by setting the java System property
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* <code>cdm.configfile.override.{propertiesSet}</code> to an alternative file location.
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* This mechanism should only be used for unit and integration tests.
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*
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* @param instanceName the name of the cdm instance. This value can be retrieved from the
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* Spring environment with the key DataSourceConfigurer.CDM_DATA_SOURCE_ID ("")
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* @param propertiesSet
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* The base name of the properties file to be loaded. This name is extended with
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* ".properties" to form the actual filename
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*
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* @return
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* The properties loaded from the file
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*/
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public Properties getProperties(String instanceName, String propertiesName) throws IOException {
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if(instanceName == null){
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throw new NullPointerException();
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}
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if(props == null){
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props = new Properties();
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File uiPropertiesFile = getPropertiesFile(instanceName, propertiesName);
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if(!uiPropertiesFile.exists()){
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BufferedWriter writer = Files.newBufferedWriter(uiPropertiesFile.toPath());
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writer.write(defaultContent);
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writer.close();
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}
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try {
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props.load(new FileInputStream(uiPropertiesFile));
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} catch (FileNotFoundException e) {
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// must not happen since we checked before
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}
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}
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return props;
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}
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}
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