src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java

Sat, 16 May 2020 17:22:02 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 16 May 2020 17:22:02 +0200
changeset 55
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parent 54
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child 57
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permissions
-rw-r--r--

access getClass() method in EL with bracket notation (otherwise more recent EL parsers will reject the expression)

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2018 Mike Becker. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 *
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28 */
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29 package de.uapcore.lightpit;
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30
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31 import de.uapcore.lightpit.dao.DataAccessObjects;
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32 import de.uapcore.lightpit.dao.postgres.PGDataAccessObjects;
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33 import org.slf4j.Logger;
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34 import org.slf4j.LoggerFactory;
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35
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36 import javax.servlet.ServletException;
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37 import javax.servlet.http.HttpServlet;
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38 import javax.servlet.http.HttpServletRequest;
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39 import javax.servlet.http.HttpServletResponse;
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40 import javax.servlet.http.HttpSession;
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41 import java.io.IOException;
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42 import java.lang.reflect.Constructor;
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43 import java.lang.reflect.Method;
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44 import java.lang.reflect.Modifier;
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45 import java.sql.Connection;
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46 import java.sql.SQLException;
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47 import java.util.*;
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48
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49 /**
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50 * A special implementation of a HTTPServlet which is focused on implementing
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51 * the necessary functionality for {@link LightPITModule}s.
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52 */
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53 public abstract class AbstractLightPITServlet extends HttpServlet {
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54
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55 private static final Logger LOG = LoggerFactory.getLogger(AbstractLightPITServlet.class);
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56
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57 private static final String SITE_JSP = Functions.jspPath("site");
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58
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59 /**
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60 * The EL proxy is necessary, because the EL resolver cannot handle annotation properties.
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61 */
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62 private LightPITModule.ELProxy moduleInfo = null;
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63
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64 /**
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65 * Invocation mapping gathered from the {@link RequestMapping} annotations.
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66 * <p>
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67 * Paths in this map must always start with a leading slash, although
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68 * the specification in the annotation must not start with a leading slash.
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69 * <p>
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70 * The reason for this is the different handling of empty paths in
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71 * {@link HttpServletRequest#getPathInfo()}.
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72 */
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73 private final Map<HttpMethod, Map<String, Method>> mappings = new HashMap<>();
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74
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75 private final List<MenuEntry> subMenu = new ArrayList<>();
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76
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77 /**
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78 * Gives implementing modules access to the {@link ModuleManager}.
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79 *
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80 * @return the module manager
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81 */
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82 protected final ModuleManager getModuleManager() {
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83 return (ModuleManager) getServletContext().getAttribute(ModuleManager.SC_ATTR_NAME);
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84 }
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85
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86
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87 /**
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88 * Creates a set of data access objects for the specified connection.
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89 *
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90 * @param connection the SQL connection
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91 * @return a set of data access objects
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92 */
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93 private DataAccessObjects createDataAccessObjects(Connection connection) throws SQLException {
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94 final var df = (DatabaseFacade) getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME);
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95 if (df.getSQLDialect() == DatabaseFacade.Dialect.Postgres) {
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96 return new PGDataAccessObjects(connection);
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97 }
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98 throw new AssertionError("Non-exhaustive if-else - this is a bug.");
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99 }
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100
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101 private ResponseType invokeMapping(Method method, HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws IOException {
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102 try {
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103 LOG.trace("invoke {}#{}", method.getDeclaringClass().getName(), method.getName());
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104 final var paramTypes = method.getParameterTypes();
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105 final var paramValues = new Object[paramTypes.length];
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106 for (int i = 0; i < paramTypes.length; i++) {
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107 if (paramTypes[i].isAssignableFrom(HttpServletRequest.class)) {
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108 paramValues[i] = req;
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109 } else if (paramTypes[i].isAssignableFrom(HttpServletResponse.class)) {
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110 paramValues[i] = resp;
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111 }
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112 if (paramTypes[i].isAssignableFrom(DataAccessObjects.class)) {
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113 paramValues[i] = dao;
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114 }
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115 }
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116 return (ResponseType) method.invoke(this, paramValues);
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117 } catch (ReflectiveOperationException | ClassCastException ex) {
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118 LOG.error("invocation of method {} failed: {}", method.getName(), ex.getMessage());
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119 LOG.debug("Details: ", ex);
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120 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
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121 return ResponseType.NONE;
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122 }
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123 }
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124
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125 @Override
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126 public void init() throws ServletException {
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127 moduleInfo = Optional.ofNullable(this.getClass().getAnnotation(LightPITModule.class))
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128 .map(LightPITModule.ELProxy::new).orElse(null);
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129
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130 if (moduleInfo != null) {
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131 scanForRequestMappings();
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132 }
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133
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134 LOG.trace("{} initialized", getServletName());
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135 }
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136
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137 private void scanForRequestMappings() {
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138 try {
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139 Method[] methods = getClass().getDeclaredMethods();
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140 for (Method method : methods) {
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141 Optional<RequestMapping> mapping = Optional.ofNullable(method.getAnnotation(RequestMapping.class));
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142 if (mapping.isPresent()) {
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143 if (!Modifier.isPublic(method.getModifiers())) {
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144 LOG.warn("{} is annotated with {} but is not public",
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145 method.getName(), RequestMapping.class.getSimpleName()
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146 );
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147 continue;
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148 }
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149 if (Modifier.isAbstract(method.getModifiers())) {
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150 LOG.warn("{} is annotated with {} but is abstract",
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151 method.getName(), RequestMapping.class.getSimpleName()
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152 );
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153 continue;
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154 }
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155 if (!ResponseType.class.isAssignableFrom(method.getReturnType())) {
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156 LOG.warn("{} is annotated with {} but has the wrong return type - 'ResponseType' required",
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157 method.getName(), RequestMapping.class.getSimpleName()
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158 );
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159 continue;
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160 }
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161
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162 boolean paramsInjectible = true;
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163 for (var param : method.getParameterTypes()) {
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164 paramsInjectible &= HttpServletRequest.class.isAssignableFrom(param)
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165 || HttpServletResponse.class.isAssignableFrom(param)
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166 || DataAccessObjects.class.isAssignableFrom(param);
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167 }
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168 if (paramsInjectible) {
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169 final String requestPath = "/" + mapping.get().requestPath();
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170
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171 if (mappings
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172 .computeIfAbsent(mapping.get().method(), k -> new HashMap<>())
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173 .putIfAbsent(requestPath, method) != null) {
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174 LOG.warn("{} {} has multiple mappings",
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175 mapping.get().method(),
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176 mapping.get().requestPath()
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177 );
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178 }
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179
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180 final var menuKey = mapping.get().menuKey();
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181 if (!menuKey.isBlank()) {
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182 subMenu.add(new MenuEntry(
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183 new ResourceKey(moduleInfo.getBundleBaseName(), menuKey),
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184 moduleInfo.getModulePath() + requestPath,
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185 mapping.get().menuSequence()));
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186 }
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187
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188 LOG.debug("{} {} maps to {}::{}",
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189 mapping.get().method(),
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190 requestPath,
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191 getClass().getSimpleName(),
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192 method.getName()
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193 );
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194 } else {
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195 LOG.warn("{} is annotated with {} but has the wrong parameters - only HttpServletRequest. HttpServletResponse, and DataAccessObjects are allowed",
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196 method.getName(), RequestMapping.class.getSimpleName()
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197 );
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198 }
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199 }
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200 }
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201 } catch (SecurityException ex) {
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202 LOG.error("Scan for request mappings on declared methods failed.", ex);
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203 }
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204 }
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205
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206 @Override
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207 public void destroy() {
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208 mappings.clear();
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209 LOG.trace("{} destroyed", getServletName());
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210 }
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211
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212 /**
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213 * Sets the name of the dynamic fragment.
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214 * <p>
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215 * It is sufficient to specify the name without any extension. The extension
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216 * is added automatically if not specified.
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217 * <p>
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218 * The fragment must be located in the dynamic fragments folder.
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219 *
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220 * @param req the servlet request object
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221 * @param fragmentName the name of the fragment
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222 * @see Constants#DYN_FRAGMENT_PATH_PREFIX
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223 */
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224 public void setDynamicFragment(HttpServletRequest req, String fragmentName) {
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225 req.setAttribute(Constants.REQ_ATTR_FRAGMENT, Functions.dynFragmentPath(fragmentName));
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226 }
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227
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228 /**
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229 * @param req the servlet request object
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230 * @param location the location where to redirect
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231 * @see Constants#REQ_ATTR_REDIRECT_LOCATION
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232 */
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233 public void setRedirectLocation(HttpServletRequest req, String location) {
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234 if (location.startsWith("./")) {
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235 location = location.replaceFirst("\\./", Functions.baseHref(req));
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236 }
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237 req.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, location);
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238 }
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239
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240 /**
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241 * Specifies the name of an additional stylesheet used by the module.
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242 * <p>
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243 * Setting an additional stylesheet is optional, but quite common for HTML
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244 * output.
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245 * <p>
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246 * It is sufficient to specify the name without any extension. The extension
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247 * is added automatically if not specified.
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248 *
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249 * @param req the servlet request object
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250 * @param stylesheet the name of the stylesheet
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251 */
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252 public void setStylesheet(HttpServletRequest req, String stylesheet) {
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253 req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css"));
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254 }
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255
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256 /**
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257 * Obtains a request parameter of the specified type.
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258 * The specified type must have a single-argument constructor accepting a string to perform conversion.
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259 * The constructor of the specified type may throw an exception on conversion failures.
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260 *
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261 * @param req the servlet request object
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262 * @param clazz the class object of the expected type
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263 * @param name the name of the parameter
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264 * @param <T> the expected type
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265 * @return the parameter value or an empty optional, if no parameter with the specified name was found
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266 */
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267 public<T> Optional<T> getParameter(HttpServletRequest req, Class<T> clazz, String name) {
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268 final String paramValue = req.getParameter(name);
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269 if (paramValue == null) return Optional.empty();
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270 if (clazz.equals(String.class)) return Optional.of((T)paramValue);
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271 try {
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272 final Constructor<T> ctor = clazz.getConstructor(String.class);
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273 return Optional.of(ctor.newInstance(paramValue));
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274 } catch (ReflectiveOperationException e) {
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275 throw new RuntimeException(e);
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276 }
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277
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278 }
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279
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280 private void forwardToFullView(HttpServletRequest req, HttpServletResponse resp)
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281 throws IOException, ServletException {
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282
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283 req.setAttribute(Constants.REQ_ATTR_MENU, getModuleManager().getMainMenu());
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284 req.setAttribute(Constants.REQ_ATTR_SUB_MENU, subMenu);
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285 req.getRequestDispatcher(SITE_JSP).forward(req, resp);
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286 }
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287
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288 private String sanitizeRequestPath(HttpServletRequest req) {
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289 return Optional.ofNullable(req.getPathInfo()).orElse("/");
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290 }
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291
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292 private Optional<Method> findMapping(HttpMethod method, HttpServletRequest req) {
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293 return Optional.ofNullable(mappings.get(method)).map(rm -> rm.get(sanitizeRequestPath(req)));
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294 }
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295
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296 private void forwardAsSpecified(ResponseType type, HttpServletRequest req, HttpServletResponse resp)
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297 throws ServletException, IOException {
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298 switch (type) {
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299 case NONE:
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300 return;
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301 case HTML:
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302 forwardToFullView(req, resp);
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303 return;
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304 // TODO: implement remaining response types
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305 default:
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306 throw new AssertionError("ResponseType switch is not exhaustive - this is a bug!");
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307 }
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308 }
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309
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310 private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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311
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312 // choose the requested language as session language (if available) or fall back to english, otherwise
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313 HttpSession session = req.getSession();
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314 if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) {
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315 Optional<List<String>> availableLanguages = Functions.availableLanguages(getServletContext()).map(Arrays::asList);
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316 Optional<Locale> reqLocale = Optional.of(req.getLocale());
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317 Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH);
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318 session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale);
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319 LOG.debug("Setting language for new session {}: {}", session.getId(), sessionLocale.getDisplayLanguage());
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320 } else {
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321 Locale sessionLocale = (Locale) session.getAttribute(Constants.SESSION_ATTR_LANGUAGE);
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322 resp.setLocale(sessionLocale);
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323 LOG.trace("Continuing session {} with language {}", session.getId(), sessionLocale);
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324 }
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325
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326 // set some internal request attributes
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327 final String fullPath = Functions.fullPath(req);
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328 req.setAttribute(Constants.REQ_ATTR_BASE_HREF, Functions.baseHref(req));
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329 req.setAttribute(Constants.REQ_ATTR_PATH, fullPath);
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330 Optional.ofNullable(moduleInfo).ifPresent((proxy) -> req.setAttribute(Constants.REQ_ATTR_MODULE_INFO, proxy));
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331
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332 // if this is an error path, bypass the normal flow
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333 if (fullPath.startsWith("/error/")) {
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334 final var mapping = findMapping(method, req);
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335 if (mapping.isPresent()) {
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336 forwardAsSpecified(invokeMapping(mapping.get(), req, resp, null), req, resp);
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337 }
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338 return;
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339 }
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340
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341 // obtain a connection and create the data access objects
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342 final var db = (DatabaseFacade) req.getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME);
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343 final var ds = db.getDataSource();
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344 if (ds == null) {
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345 resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, "JNDI DataSource lookup failed. See log for details.");
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346 return;
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347 }
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348 try (final var connection = ds.getConnection()) {
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349 final var dao = createDataAccessObjects(connection);
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350 try {
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351 connection.setAutoCommit(false);
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352 // call the handler, if available, or send an HTTP 404 error
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353 final var mapping = findMapping(method, req);
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354 if (mapping.isPresent()) {
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355 forwardAsSpecified(invokeMapping(mapping.get(), req, resp, dao), req, resp);
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356 } else {
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357 resp.sendError(HttpServletResponse.SC_NOT_FOUND);
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358 }
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359 connection.commit();
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360 } catch (SQLException ex) {
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361 LOG.warn("Database transaction failed (Code {}): {}", ex.getErrorCode(), ex.getMessage());
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362 LOG.debug("Details: ", ex);
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363 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Unhandled Transaction Error - Code: " + ex.getErrorCode());
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364 connection.rollback();
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365 }
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366 } catch (SQLException ex) {
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367 LOG.error("Severe Database Exception (Code {}): {}", ex.getErrorCode(), ex.getMessage());
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368 LOG.debug("Details: ", ex);
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369 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database Error - Code: " + ex.getErrorCode());
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370 }
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371 }
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372
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373 @Override
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374 protected final void doGet(HttpServletRequest req, HttpServletResponse resp)
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375 throws ServletException, IOException {
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376 doProcess(HttpMethod.GET, req, resp);
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377 }
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378
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379 @Override
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380 protected final void doPost(HttpServletRequest req, HttpServletResponse resp)
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381 throws ServletException, IOException {
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382 doProcess(HttpMethod.POST, req, resp);
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383 }
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384 }

mercurial