/*
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Nutzerverwaltung - A Generic User Manager
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Copyright (c) 2016 Ulrich Hilger
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package de.uhilger.um.api;
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import de.uhilger.baselink.GenericRecord;
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import de.uhilger.baselink.PersistenceManager;
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import de.uhilger.baselink.Record;
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import de.uhilger.transit.web.WebKontext;
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import de.uhilger.um.Digester;
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import de.uhilger.um.daten.User;
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import de.uhilger.um.daten.UserRole;
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import java.sql.Connection;
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import java.util.List;
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import java.util.Properties;
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import javax.servlet.ServletContext;
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/**
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* <p>Die Methoden der Klasse UserMgr sind
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* die 'Fassade', die über Transit als Programmschnittstelle
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* (Application Programming Interface, API)
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* nach außen bereitgestellt wird. UserMgr dient weitgehend
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* als 'Durchreiche' für die Funktionalität anderer Klassen.</p>
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*
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* <p>
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* Der UserMgr erhält die benötigten Methoden aus dem ServletContext.
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* Auf diese Weise sind keine statischen Abhängigkeiten in den Code
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* gewandert. Die folgenden Elemente werden vom UserMgr im ServletContext
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* erwartet:
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*
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* [noch auspraegen]
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*
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* PersistenceManager
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* SQL-Properties
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* Digester
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* </p>
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*
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* @author Copyright (c) Ulrich Hilger, http://uhilger.de
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* @author Published under the terms and conditions of the
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* <a href="http://www.gnu.org/licenses/agpl-3.0" target="_blank">GNU Affero
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* General Public License</a>
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*
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* @version 2, December 27, 2016
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*/
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public class UserMgr implements WebKontext {
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private ServletContext ctx;
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private static final Record UserMapper = new GenericRecord(User.class);
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private static final Record UserRoleMapper = new GenericRecord(UserRole.class);
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/** Name, unter dem das Properties-Objekt mit den SQL-Befehlen im ServletContext hinterlegt ist */
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public static final String UM_SQL_PROPERTIES = "umSqlProperties";
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public static final String P_DIGESTER = "digester";
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/** Name, unter dem das Zugriffsobjekt zur Datenbank im ServletContext hinterlegt ist */
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public static final String UM_DB = "umDb";
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/** Boolean-Konstante zur Kennzeichnung von Datenbankergebnissen ohne Blobs */
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public static final boolean WITHOUT_BLOBS = false;
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public static final String SQL_GET_USER_LIST = "getUserList";
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public static final String SQL_GET_USER_NAME_LIST = "getUserNameList";
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public static final String SQL_GET_ROLE_LIST = "getRoleList";
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public static final String SQL_GET_USER_ROLES = "getUserRoles";
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public static final String SQL_DELETE_USER = "deleteUser";
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public static final String SQL_DELETE_USER_ROLES = "deleteUserRoles";
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/* ----------- Benutzer -------------- */
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public User createUser(User user) throws ClassNotFoundException, InstantiationException, IllegalAccessException {
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String kw = user.getPw();
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String digesterClassName = ctx.getInitParameter(P_DIGESTER);
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Digester digester = (Digester) Class.forName(digesterClassName).newInstance();
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String digestedPw = digester.digest(kw, Digester.MD5, null);
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user.setPw(digestedPw);
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getDb().insert(user, UserMapper);
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return user;
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}
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public List getUserNameList() {
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return getDb().select(getSql(SQL_GET_USER_NAME_LIST), WITHOUT_BLOBS);
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}
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public User deleteUser(User user) {
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PersistenceManager pm = getDb();
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Connection c = pm.getConnection();
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pm.startTransaction(c);
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pm.execute(c, getSql(SQL_DELETE_USER_ROLES), user.getId());
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User deletedUser = (User) pm.delete(c, user, UserMapper);
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pm.commit(c);
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return deletedUser;
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}
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/* ------------ Rollen ------------------ */
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public UserRole grantRole(String userId, String roleName) {
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UserRole ur = new UserRole();
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ur.setRole(roleName);
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ur.setUser(userId);
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getDb().insert(ur, UserRoleMapper);
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return ur;
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}
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public UserRole revokeRole(String userId, String roleName) {
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UserRole ur = new UserRole();
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ur.setRole(roleName);
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ur.setUser(userId);
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getDb().delete(ur, UserRoleMapper);
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return ur;
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}
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public List getRoleNamesGranted() {
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return getDb().select(getSql(SQL_GET_ROLE_LIST), WITHOUT_BLOBS);
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}
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public List getUserRoleNames(String userId) {
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return getDb().select(getSql(SQL_GET_USER_ROLES), WITHOUT_BLOBS, userId);
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}
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/* ----------- Helfer ---- */
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/**
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* Ein benanntes SQL-Kommando ermitteln
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* @param id Name des gewuenschten SQL-Kommandos
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* @return das SQL-Kommando mit der in id angegebenen Bezeichnung
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*/
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private String getSql(String id) {
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Properties sql = (Properties) ctx.getAttribute(UserMgr.UM_SQL_PROPERTIES);
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return sql.getProperty(id);
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}
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private PersistenceManager getDb() {
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return (PersistenceManager) ctx.getAttribute(UM_DB);
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}
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/* ------------- Implementierung WebKontext ------------- */
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@Override
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public ServletContext getServletContext() {
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return ctx;
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}
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@Override
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public void setServletContext(ServletContext servletContext) {
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this.ctx = servletContext;
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}
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}
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