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

Sat, 29 Aug 2020 16:48:15 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 29 Aug 2020 16:48:15 +0200
changeset 104
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parent 97
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child 106
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permissions
-rw-r--r--

fixes issue not containing version information in issue form

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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.*;
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43 import java.sql.Connection;
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44 import java.sql.SQLException;
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45 import java.util.*;
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46 import java.util.function.Function;
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48 /**
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49 * A special implementation of a HTTPServlet which is focused on implementing
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50 * the necessary functionality for LightPIT pages.
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51 */
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52 public abstract class AbstractLightPITServlet extends HttpServlet {
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53
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54 private static final Logger LOG = LoggerFactory.getLogger(AbstractLightPITServlet.class);
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55
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56 private static final String SITE_JSP = Functions.jspPath("site");
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58
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59 @FunctionalInterface
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60 protected interface SQLFindFunction<K, T> {
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61 T apply(K key) throws SQLException;
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63 default <V> SQLFindFunction<V, T> compose(Function<? super V, ? extends K> before) throws SQLException {
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64 Objects.requireNonNull(before);
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65 return (v) -> this.apply(before.apply(v));
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66 }
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68 default <V> SQLFindFunction<K, V> andThen(Function<? super T, ? extends V> after) throws SQLException {
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69 Objects.requireNonNull(after);
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70 return (t) -> after.apply(this.apply(t));
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71 }
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73 static <K> Function<K, K> identity() {
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74 return (t) -> t;
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75 }
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76 }
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77
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78 /**
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79 * Invocation mapping gathered from the {@link RequestMapping} annotations.
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80 * <p>
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81 * Paths in this map must always start with a leading slash, although
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82 * the specification in the annotation must not start with a leading slash.
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83 * <p>
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84 * The reason for this is the different handling of empty paths in
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85 * {@link HttpServletRequest#getPathInfo()}.
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86 */
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87 private final Map<HttpMethod, Map<String, Method>> mappings = new HashMap<>();
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89 /**
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90 * Returns the name of the resource bundle associated with this servlet.
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91 *
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92 * @return the resource bundle base name
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93 */
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94 protected abstract String getResourceBundleName();
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95
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96
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97 /**
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98 * Creates a set of data access objects for the specified connection.
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99 *
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100 * @param connection the SQL connection
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101 * @return a set of data access objects
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102 */
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103 private DataAccessObjects createDataAccessObjects(Connection connection) throws SQLException {
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104 final var df = (DatabaseFacade) getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME);
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105 if (df.getSQLDialect() == DatabaseFacade.Dialect.Postgres) {
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106 return new PGDataAccessObjects(connection);
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107 }
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108 throw new AssertionError("Non-exhaustive if-else - this is a bug.");
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109 }
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110
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111 private ResponseType invokeMapping(Method method, HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws IOException {
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112 try {
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113 LOG.trace("invoke {}#{}", method.getDeclaringClass().getName(), method.getName());
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114 final var paramTypes = method.getParameterTypes();
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115 final var paramValues = new Object[paramTypes.length];
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116 for (int i = 0; i < paramTypes.length; i++) {
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117 if (paramTypes[i].isAssignableFrom(HttpServletRequest.class)) {
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118 paramValues[i] = req;
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119 } else if (paramTypes[i].isAssignableFrom(HttpServletResponse.class)) {
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120 paramValues[i] = resp;
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121 }
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122 if (paramTypes[i].isAssignableFrom(DataAccessObjects.class)) {
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123 paramValues[i] = dao;
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124 }
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125 }
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126 return (ResponseType) method.invoke(this, paramValues);
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127 } catch (InvocationTargetException ex) {
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128 LOG.error("invocation of method {}::{} failed: {}",
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129 method.getDeclaringClass().getName(), method.getName(), ex.getTargetException().getMessage());
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130 LOG.debug("Details: ", ex.getTargetException());
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131 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex.getTargetException().getMessage());
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132 return ResponseType.NONE;
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133 } catch (ReflectiveOperationException | ClassCastException ex) {
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134 LOG.error("invocation of method {}::{} failed: {}",
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135 method.getDeclaringClass().getName(), method.getName(), ex.getMessage());
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136 LOG.debug("Details: ", ex);
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137 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex.getMessage());
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138 return ResponseType.NONE;
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139 }
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140 }
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141
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142 @Override
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143 public void init() throws ServletException {
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144 scanForRequestMappings();
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145
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146 LOG.trace("{} initialized", getServletName());
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147 }
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148
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149 private void scanForRequestMappings() {
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150 try {
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151 Method[] methods = getClass().getDeclaredMethods();
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152 for (Method method : methods) {
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153 Optional<RequestMapping> mapping = Optional.ofNullable(method.getAnnotation(RequestMapping.class));
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154 if (mapping.isPresent()) {
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155 if (!Modifier.isPublic(method.getModifiers())) {
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156 LOG.warn("{} is annotated with {} but is not public",
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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 if (Modifier.isAbstract(method.getModifiers())) {
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162 LOG.warn("{} is annotated with {} but is abstract",
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163 method.getName(), RequestMapping.class.getSimpleName()
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164 );
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165 continue;
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166 }
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167 if (!ResponseType.class.isAssignableFrom(method.getReturnType())) {
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168 LOG.warn("{} is annotated with {} but has the wrong return type - 'ResponseType' required",
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169 method.getName(), RequestMapping.class.getSimpleName()
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170 );
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171 continue;
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172 }
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173
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174 boolean paramsInjectible = true;
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175 for (var param : method.getParameterTypes()) {
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176 paramsInjectible &= HttpServletRequest.class.isAssignableFrom(param)
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177 || HttpServletResponse.class.isAssignableFrom(param)
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178 || DataAccessObjects.class.isAssignableFrom(param);
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179 }
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180 if (paramsInjectible) {
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181 String requestPath = "/" + mapping.get().requestPath();
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182
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183 if (mappings
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184 .computeIfAbsent(mapping.get().method(), k -> new HashMap<>())
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185 .putIfAbsent(requestPath, method) != null) {
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186 LOG.warn("{} {} has multiple mappings",
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187 mapping.get().method(),
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188 mapping.get().requestPath()
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189 );
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190 }
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191
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192 LOG.debug("{} {} maps to {}::{}",
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193 mapping.get().method(),
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194 requestPath,
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195 getClass().getSimpleName(),
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196 method.getName()
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197 );
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198 } else {
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199 LOG.warn("{} is annotated with {} but has the wrong parameters - only HttpServletRequest. HttpServletResponse, and DataAccessObjects are allowed",
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200 method.getName(), RequestMapping.class.getSimpleName()
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201 );
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202 }
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203 }
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204 }
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205 } catch (SecurityException ex) {
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206 LOG.error("Scan for request mappings on declared methods failed.", ex);
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207 }
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208 }
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209
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210 @Override
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211 public void destroy() {
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212 mappings.clear();
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213 LOG.trace("{} destroyed", getServletName());
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214 }
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215
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216 /**
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217 * Sets the name of the content page.
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218 * <p>
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219 * It is sufficient to specify the name without any extension. The extension
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220 * is added automatically if not specified.
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221 *
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222 * @param req the servlet request object
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223 * @param pageName the name of the content page
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224 * @see Constants#REQ_ATTR_CONTENT_PAGE
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225 */
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226 protected void setContentPage(HttpServletRequest req, String pageName) {
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227 req.setAttribute(Constants.REQ_ATTR_CONTENT_PAGE, Functions.jspPath(pageName));
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228 }
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229
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230 /**
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231 * Sets the navigation menu.
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232 *
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233 * @param req the servlet request object
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234 * @param navigationItems the menu entries for the navigation menu
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235 * @see Constants#REQ_ATTR_NAVIGATION
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236 */
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237 protected void setNavigationMenu(HttpServletRequest req, List<MenuEntry> navigationItems) {
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238 req.setAttribute(Constants.REQ_ATTR_NAVIGATION, navigationItems);
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239 }
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240
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241 /**
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242 * @param req the servlet request object
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243 * @param location the location where to redirect
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244 * @see Constants#REQ_ATTR_REDIRECT_LOCATION
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245 */
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246 protected void setRedirectLocation(HttpServletRequest req, String location) {
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247 if (location.startsWith("./")) {
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248 location = location.replaceFirst("\\./", Functions.baseHref(req));
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249 }
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250 req.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, location);
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251 }
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252
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253 /**
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254 * Specifies the name of an additional stylesheet used by the module.
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255 * <p>
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256 * Setting an additional stylesheet is optional, but quite common for HTML
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257 * output.
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258 * <p>
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259 * It is sufficient to specify the name without any extension. The extension
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260 * is added automatically if not specified.
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261 *
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262 * @param req the servlet request object
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263 * @param stylesheet the name of the stylesheet
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264 */
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265 public void setStylesheet(HttpServletRequest req, String stylesheet) {
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266 req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css"));
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267 }
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268
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269 /**
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270 * Sets the view model object.
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271 * The type must match the expected type in the JSP file.
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272 *
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273 * @param req the servlet request object
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274 * @param viewModel the view model object
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275 */
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276 public void setViewModel(HttpServletRequest req, Object viewModel) {
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277 req.setAttribute(Constants.REQ_ATTR_VIEWMODEL, viewModel);
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278 }
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279
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280 /**
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281 * Obtains a request parameter of the specified type.
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282 * The specified type must have a single-argument constructor accepting a string to perform conversion.
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283 * The constructor of the specified type may throw an exception on conversion failures.
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284 *
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285 * @param req the servlet request object
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286 * @param clazz the class object of the expected type
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287 * @param name the name of the parameter
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288 * @param <T> the expected type
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289 * @return the parameter value or an empty optional, if no parameter with the specified name was found
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290 */
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291 protected <T> Optional<T> getParameter(HttpServletRequest req, Class<T> clazz, String name) {
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292 if (clazz.isArray()) {
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293 final String[] paramValues = req.getParameterValues(name);
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294 int len = paramValues == null ? 0 : paramValues.length;
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295 final var array = (T) Array.newInstance(clazz.getComponentType(), len);
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296 for (int i = 0; i < len; i++) {
83
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297 try {
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298 final Constructor<?> ctor = clazz.getComponentType().getConstructor(String.class);
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299 Array.set(array, i, ctor.newInstance(paramValues[i]));
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300 } catch (ReflectiveOperationException e) {
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301 throw new RuntimeException(e);
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302 }
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303 }
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304 return Optional.of(array);
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305 } else {
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306 final String paramValue = req.getParameter(name);
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307 if (paramValue == null) return Optional.empty();
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308 if (clazz.equals(Boolean.class)) {
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309 if (paramValue.toLowerCase().equals("false") || paramValue.equals("0")) {
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310 return Optional.of((T) Boolean.FALSE);
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311 } else {
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312 return Optional.of((T) Boolean.TRUE);
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313 }
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314 }
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315 if (clazz.equals(String.class)) return Optional.of((T) paramValue);
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316 if (java.sql.Date.class.isAssignableFrom(clazz)) {
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317 try {
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318 return Optional.of((T) java.sql.Date.valueOf(paramValue));
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319 } catch (IllegalArgumentException ex) {
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320 return Optional.empty();
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321 }
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322 }
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323 try {
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324 final Constructor<T> ctor = clazz.getConstructor(String.class);
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325 return Optional.of(ctor.newInstance(paramValue));
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326 } catch (ReflectiveOperationException e) {
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327 throw new RuntimeException(e);
80
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328 }
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329 }
47
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330 }
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331
63
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332 /**
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333 * Tries to look up an entity with a key obtained from a request parameter.
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334 *
71
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335 * @param req the servlet request object
63
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336 * @param clazz the class representing the type of the request parameter
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337 * @param name the name of the request parameter
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338 * @param find the find function (typically a DAO function)
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339 * @param <T> the type of the request parameter
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340 * @param <R> the type of the looked up entity
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341 * @return the retrieved entity or an empty optional if there is no such entity or the request parameter was missing
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342 * @throws SQLException if the find function throws an exception
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343 */
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344 protected <T, R> Optional<R> findByParameter(HttpServletRequest req, Class<T> clazz, String name, SQLFindFunction<? super T, ? extends R> find) throws SQLException {
63
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345 final var param = getParameter(req, clazz, name);
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346 if (param.isPresent()) {
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347 return Optional.ofNullable(find.apply(param.get()));
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348 } else {
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349 return Optional.empty();
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350 }
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351 }
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352
10
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353 private void forwardToFullView(HttpServletRequest req, HttpServletResponse resp)
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354 throws IOException, ServletException {
34
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355
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356 final String lightpitBundle = "localization.lightpit";
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357 final var mainMenu = List.of(
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358 new MenuEntry(new ResourceKey(lightpitBundle, "menu.projects"), "projects/"),
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359 new MenuEntry(new ResourceKey(lightpitBundle, "menu.users"), "teams/"),
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360 new MenuEntry(new ResourceKey(lightpitBundle, "menu.languages"), "language/")
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361 );
71
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362 for (var entry : mainMenu) {
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363 if (Functions.fullPath(req).startsWith("/" + entry.getPathName())) {
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364 entry.setActive(true);
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365 }
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366 }
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367 req.setAttribute(Constants.REQ_ATTR_MENU, mainMenu);
43
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368 req.getRequestDispatcher(SITE_JSP).forward(req, resp);
10
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369 }
34
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370
45
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371 private String sanitizeRequestPath(HttpServletRequest req) {
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372 return Optional.ofNullable(req.getPathInfo()).orElse("/");
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373 }
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374
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375 private Optional<Method> findMapping(HttpMethod method, HttpServletRequest req) {
45
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376 return Optional.ofNullable(mappings.get(method)).map(rm -> rm.get(sanitizeRequestPath(req)));
11
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377 }
34
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378
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379 private void forwardAsSpecified(ResponseType type, HttpServletRequest req, HttpServletResponse resp)
12
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380 throws ServletException, IOException {
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381 switch (type) {
34
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382 case NONE:
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383 return;
43
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384 case HTML:
12
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385 forwardToFullView(req, resp);
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386 return;
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387 // TODO: implement remaining response types
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388 default:
34
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389 throw new AssertionError("ResponseType switch is not exhaustive - this is a bug!");
12
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390 }
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391 }
34
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392
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diff changeset
393 private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
27
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diff changeset
394
13
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395 // choose the requested language as session language (if available) or fall back to english, otherwise
20
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396 HttpSession session = req.getSession();
13
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diff changeset
397 if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) {
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diff changeset
398 Optional<List<String>> availableLanguages = Functions.availableLanguages(getServletContext()).map(Arrays::asList);
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diff changeset
399 Optional<Locale> reqLocale = Optional.of(req.getLocale());
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400 Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH);
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diff changeset
401 session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale);
34
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diff changeset
402 LOG.debug("Setting language for new session {}: {}", session.getId(), sessionLocale.getDisplayLanguage());
14
2b270c714678 changed logger implementation to log4j2
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diff changeset
403 } else {
15
bb594abac796 language selector completed
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diff changeset
404 Locale sessionLocale = (Locale) session.getAttribute(Constants.SESSION_ATTR_LANGUAGE);
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diff changeset
405 resp.setLocale(sessionLocale);
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diff changeset
406 LOG.trace("Continuing session {} with language {}", session.getId(), sessionLocale);
13
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diff changeset
407 }
34
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diff changeset
408
21
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diff changeset
409 // set some internal request attributes
53
6a8498291606 fixes bug where displaying an error page for missing data source would also require that data source (error pages don't try to get database connections now)
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diff changeset
410 final String fullPath = Functions.fullPath(req);
47
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diff changeset
411 req.setAttribute(Constants.REQ_ATTR_BASE_HREF, Functions.baseHref(req));
53
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diff changeset
412 req.setAttribute(Constants.REQ_ATTR_PATH, fullPath);
78
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diff changeset
413 req.setAttribute(Constants.REQ_ATTR_RESOURCE_BUNDLE, getResourceBundleName());
34
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diff changeset
414
53
6a8498291606 fixes bug where displaying an error page for missing data source would also require that data source (error pages don't try to get database connections now)
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diff changeset
415 // if this is an error path, bypass the normal flow
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diff changeset
416 if (fullPath.startsWith("/error/")) {
6a8498291606 fixes bug where displaying an error page for missing data source would also require that data source (error pages don't try to get database connections now)
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diff changeset
417 final var mapping = findMapping(method, req);
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diff changeset
418 if (mapping.isPresent()) {
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diff changeset
419 forwardAsSpecified(invokeMapping(mapping.get(), req, resp, null), req, resp);
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diff changeset
420 }
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diff changeset
421 return;
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diff changeset
422 }
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parents: 47
diff changeset
423
38
cf85ef18f231 adds DAO for Project entity and save/update methods
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diff changeset
424 // obtain a connection and create the data access objects
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diff changeset
425 final var db = (DatabaseFacade) req.getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME);
53
6a8498291606 fixes bug where displaying an error page for missing data source would also require that data source (error pages don't try to get database connections now)
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diff changeset
426 final var ds = db.getDataSource();
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diff changeset
427 if (ds == null) {
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parents: 47
diff changeset
428 resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, "JNDI DataSource lookup failed. See log for details.");
6a8498291606 fixes bug where displaying an error page for missing data source would also require that data source (error pages don't try to get database connections now)
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429 return;
6a8498291606 fixes bug where displaying an error page for missing data source would also require that data source (error pages don't try to get database connections now)
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430 }
6a8498291606 fixes bug where displaying an error page for missing data source would also require that data source (error pages don't try to get database connections now)
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431 try (final var connection = ds.getConnection()) {
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432 final var dao = createDataAccessObjects(connection);
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433 try {
e722861558bb fixes minor issues that were reported by default inspection
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434 connection.setAutoCommit(false);
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435 // call the handler, if available, or send an HTTP 404 error
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436 final var mapping = findMapping(method, req);
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437 if (mapping.isPresent()) {
e722861558bb fixes minor issues that were reported by default inspection
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438 forwardAsSpecified(invokeMapping(mapping.get(), req, resp, dao), req, resp);
e722861558bb fixes minor issues that were reported by default inspection
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439 } else {
e722861558bb fixes minor issues that were reported by default inspection
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440 resp.sendError(HttpServletResponse.SC_NOT_FOUND);
e722861558bb fixes minor issues that were reported by default inspection
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441 }
e722861558bb fixes minor issues that were reported by default inspection
Mike Becker <universe@uap-core.de>
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442 connection.commit();
e722861558bb fixes minor issues that were reported by default inspection
Mike Becker <universe@uap-core.de>
parents: 38
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443 } catch (SQLException ex) {
e722861558bb fixes minor issues that were reported by default inspection
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444 LOG.warn("Database transaction failed (Code {}): {}", ex.getErrorCode(), ex.getMessage());
e722861558bb fixes minor issues that were reported by default inspection
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445 LOG.debug("Details: ", ex);
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446 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Unhandled Transaction Error - Code: " + ex.getErrorCode());
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447 connection.rollback();
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cf85ef18f231 adds DAO for Project entity and save/update methods
Mike Becker <universe@uap-core.de>
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448 }
cf85ef18f231 adds DAO for Project entity and save/update methods
Mike Becker <universe@uap-core.de>
parents: 36
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449 } catch (SQLException ex) {
39
e722861558bb fixes minor issues that were reported by default inspection
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parents: 38
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450 LOG.error("Severe Database Exception (Code {}): {}", ex.getErrorCode(), ex.getMessage());
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451 LOG.debug("Details: ", ex);
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452 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database Error - Code: " + ex.getErrorCode());
12
005d27918b57 implements ResponseTypes
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453 }
005d27918b57 implements ResponseTypes
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parents: 11
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454 }
34
824d4042c857 cleanup and simplification of database access layer
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parents: 33
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455
7
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456 @Override
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457 protected final void doGet(HttpServletRequest req, HttpServletResponse resp)
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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parents:
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458 throws ServletException, IOException {
12
005d27918b57 implements ResponseTypes
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459 doProcess(HttpMethod.GET, req, resp);
7
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parents:
diff changeset
460 }
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff changeset
461
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff changeset
462 @Override
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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parents:
diff changeset
463 protected final void doPost(HttpServletRequest req, HttpServletResponse resp)
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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parents:
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464 throws ServletException, IOException {
12
005d27918b57 implements ResponseTypes
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diff changeset
465 doProcess(HttpMethod.POST, req, resp);
7
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parents:
diff changeset
466 }
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff changeset
467 }

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