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

Fri, 18 Dec 2020 16:16:54 +0100

author
Mike Becker <universe@uap-core.de>
date
Fri, 18 Dec 2020 16:16:54 +0100
changeset 165
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parent 163
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child 167
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permissions
-rw-r--r--

Add mailto link to the display name above comments - fixes #112

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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.DaoProvider;
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32 import de.uapcore.lightpit.dao.postgres.PGDaoProvider;
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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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47 import java.util.stream.Collectors;
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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 LightPIT pages.
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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 = jspPath("site");
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59
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60 @FunctionalInterface
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61 protected interface SQLFindFunction<K, T> {
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62 T apply(K key) throws SQLException;
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64 default <V> SQLFindFunction<V, T> compose(Function<? super V, ? extends K> before) throws SQLException {
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65 Objects.requireNonNull(before);
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66 return (v) -> this.apply(before.apply(v));
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67 }
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69 default <V> SQLFindFunction<K, V> andThen(Function<? super T, ? extends V> after) throws SQLException {
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70 Objects.requireNonNull(after);
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71 return (t) -> after.apply(this.apply(t));
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72 }
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74 static <K> Function<K, K> identity() {
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75 return (t) -> t;
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76 }
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77 }
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79 /**
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80 * Invocation mapping gathered from the {@link RequestMapping} annotations.
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81 * <p>
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82 * Paths in this map must always start with a leading slash, although
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83 * the specification in the annotation must not start with a leading slash.
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84 * <p>
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85 * The reason for this is the different handling of empty paths in
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86 * {@link HttpServletRequest#getPathInfo()}.
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87 */
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88 private final Map<HttpMethod, Map<PathPattern, Method>> mappings = new HashMap<>();
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89
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90 /**
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91 * Returns the name of the resource bundle associated with this servlet.
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92 *
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93 * @return the resource bundle base name
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94 */
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95 protected abstract String getResourceBundleName();
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96
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97
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98 /**
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99 * Creates a set of data access objects for the specified connection.
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100 *
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101 * @param connection the SQL connection
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102 * @return a set of data access objects
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103 */
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104 private DaoProvider createDataAccessObjects(Connection connection) throws SQLException {
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105 final var df = (DataSourceProvider) getServletContext().getAttribute(DataSourceProvider.Companion.getSC_ATTR_NAME());
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106 if (df.getDialect() == DataSourceProvider.Dialect.Postgres) {
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107 return new PGDaoProvider(connection);
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108 }
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109 throw new UnsupportedOperationException("Non-exhaustive if-else - this is a bug.");
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110 }
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111
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112 private void invokeMapping(Map.Entry<PathPattern, Method> mapping, HttpServletRequest req, HttpServletResponse resp, DaoProvider dao) throws IOException {
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113 final var pathPattern = mapping.getKey();
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114 final var method = mapping.getValue();
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115 try {
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116 LOG.trace("invoke {}#{}", method.getDeclaringClass().getName(), method.getName());
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117 final var paramTypes = method.getParameterTypes();
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118 final var paramValues = new Object[paramTypes.length];
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119 for (int i = 0; i < paramTypes.length; i++) {
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120 if (paramTypes[i].isAssignableFrom(HttpServletRequest.class)) {
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121 paramValues[i] = req;
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122 } else if (paramTypes[i].isAssignableFrom(HttpServletResponse.class)) {
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123 paramValues[i] = resp;
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124 }
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125 if (paramTypes[i].isAssignableFrom(DaoProvider.class)) {
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126 paramValues[i] = dao;
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127 }
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128 if (paramTypes[i].isAssignableFrom(PathParameters.class)) {
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129 paramValues[i] = pathPattern.obtainPathParameters(sanitizeRequestPath(req));
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130 }
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131 }
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132 method.invoke(this, paramValues);
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133 } catch (InvocationTargetException ex) {
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134 LOG.error("invocation of method {}::{} failed: {}",
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135 method.getDeclaringClass().getName(), method.getName(), ex.getTargetException().getMessage());
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136 LOG.debug("Details: ", ex.getTargetException());
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137 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex.getTargetException().getMessage());
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138 } catch (ReflectiveOperationException | ClassCastException ex) {
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139 LOG.error("invocation of method {}::{} failed: {}",
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140 method.getDeclaringClass().getName(), method.getName(), ex.getMessage());
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141 LOG.debug("Details: ", ex);
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142 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex.getMessage());
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143 }
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144 }
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145
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146 @Override
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147 public void init() throws ServletException {
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148 scanForRequestMappings();
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149
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150 LOG.trace("{} initialized", getServletName());
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151 }
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152
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153 private void scanForRequestMappings() {
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154 try {
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155 Method[] methods = getClass().getDeclaredMethods();
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156 for (Method method : methods) {
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157 Optional<RequestMapping> mapping = Optional.ofNullable(method.getAnnotation(RequestMapping.class));
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158 if (mapping.isPresent()) {
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159 if (mapping.get().requestPath().isBlank()) {
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160 LOG.warn("{} is annotated with {} but request path is empty",
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161 method.getName(), RequestMapping.class.getSimpleName()
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162 );
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163 continue;
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164 }
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165
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166 if (!Modifier.isPublic(method.getModifiers())) {
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167 LOG.warn("{} is annotated with {} but is not public",
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168 method.getName(), RequestMapping.class.getSimpleName()
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169 );
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170 continue;
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171 }
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172 if (Modifier.isAbstract(method.getModifiers())) {
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173 LOG.warn("{} is annotated with {} but is abstract",
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174 method.getName(), RequestMapping.class.getSimpleName()
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175 );
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176 continue;
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177 }
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178
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179 boolean paramsInjectible = true;
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180 for (var param : method.getParameterTypes()) {
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181 paramsInjectible &= HttpServletRequest.class.isAssignableFrom(param)
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182 || HttpServletResponse.class.isAssignableFrom(param)
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183 || PathParameters.class.isAssignableFrom(param)
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184 || DaoProvider.class.isAssignableFrom(param);
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185 }
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186 if (paramsInjectible) {
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187 try {
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188 PathPattern pathPattern = new PathPattern(mapping.get().requestPath());
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189
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190 final var methodMappings = mappings.computeIfAbsent(mapping.get().method(), k -> new HashMap<>());
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191 final var currentMapping = methodMappings.putIfAbsent(pathPattern, method);
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192 if (currentMapping != null) {
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193 LOG.warn("Cannot map {} {} to {} in class {} - this would override the mapping to {}",
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194 mapping.get().method(),
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195 mapping.get().requestPath(),
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196 method.getName(),
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197 getClass().getSimpleName(),
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198 currentMapping.getName()
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199 );
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200 }
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201
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202 LOG.debug("{} {} maps to {}::{}",
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203 mapping.get().method(),
130
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204 mapping.get().requestPath(),
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205 getClass().getSimpleName(),
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206 method.getName()
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207 );
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208 } catch (IllegalArgumentException ex) {
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209 LOG.warn("Request mapping for {} failed: path pattern '{}' is syntactically invalid",
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210 method.getName(), mapping.get().requestPath()
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211 );
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212 }
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213 } else {
130
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214 LOG.warn("{} is annotated with {} but has the wrong parameters - only HttpServletRequest, HttpServletResponse, PathParameters, and DataAccessObjects are allowed",
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215 method.getName(), RequestMapping.class.getSimpleName()
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216 );
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217 }
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218 }
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219 }
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220 } catch (SecurityException ex) {
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221 LOG.error("Scan for request mappings on declared methods failed.", ex);
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222 }
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223 }
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224
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225 @Override
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226 public void destroy() {
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227 mappings.clear();
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228 LOG.trace("{} destroyed", getServletName());
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229 }
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230
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231 /**
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232 * Sets the name of the content page.
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233 * <p>
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234 * It is sufficient to specify the name without any extension. The extension
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235 * is added automatically if not specified.
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236 *
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237 * @param req the servlet request object
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238 * @param pageName the name of the content page
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239 * @see Constants#REQ_ATTR_CONTENT_PAGE
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240 */
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241 protected void setContentPage(HttpServletRequest req, String pageName) {
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242 req.setAttribute(Constants.REQ_ATTR_CONTENT_PAGE, jspPath(pageName));
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243 }
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244
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245 /**
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246 * Sets the navigation menu.
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247 *
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248 * @param req the servlet request object
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249 * @param jspName the name of the menu's jsp file
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250 * @see Constants#REQ_ATTR_NAVIGATION
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251 */
109
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252 protected void setNavigationMenu(HttpServletRequest req, String jspName) {
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253 req.setAttribute(Constants.REQ_ATTR_NAVIGATION, jspPath(jspName));
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254 }
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255
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256 /**
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257 * @param req the servlet request object
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258 * @param location the location where to redirect
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259 * @see Constants#REQ_ATTR_REDIRECT_LOCATION
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260 */
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261 protected void setRedirectLocation(HttpServletRequest req, String location) {
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262 if (location.startsWith("./")) {
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263 location = location.replaceFirst("\\./", baseHref(req));
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264 }
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265 req.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, location);
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266 }
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267
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268 /**
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269 * Specifies the names of additional stylesheets used by this Servlet.
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270 * <p>
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271 * It is sufficient to specify the name without any extension. The extension
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272 * is added automatically if not specified.
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273 *
163
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274 * @param req the servlet request object
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275 * @param stylesheets the names of the stylesheets
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276 */
163
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277 public void setStylesheet(HttpServletRequest req, String ... stylesheets) {
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278 req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Arrays
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279 .stream(stylesheets)
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280 .map(s -> enforceExt(s, ".css"))
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281 .collect(Collectors.toUnmodifiableList()));
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282 }
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283
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284 /**
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285 * Sets the view model object.
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286 * The type must match the expected type in the JSP file.
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287 *
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288 * @param req the servlet request object
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289 * @param viewModel the view model object
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290 */
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291 public void setViewModel(HttpServletRequest req, Object viewModel) {
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292 req.setAttribute(Constants.REQ_ATTR_VIEWMODEL, viewModel);
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293 }
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294
131
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295 private <T> Optional<T> parseParameter(String paramValue, Class<T> clazz) {
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296 if (paramValue == null) return Optional.empty();
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297 if (clazz.equals(Boolean.class)) {
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298 if (paramValue.toLowerCase().equals("false") || paramValue.equals("0")) {
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299 return Optional.of((T) Boolean.FALSE);
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300 } else {
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301 return Optional.of((T) Boolean.TRUE);
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302 }
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303 }
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304 if (clazz.equals(String.class)) return Optional.of((T) paramValue);
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305 if (java.sql.Date.class.isAssignableFrom(clazz)) {
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306 try {
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307 return Optional.of((T) java.sql.Date.valueOf(paramValue));
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308 } catch (IllegalArgumentException ex) {
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309 return Optional.empty();
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310 }
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311 }
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312 try {
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313 final Constructor<T> ctor = clazz.getConstructor(String.class);
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314 return Optional.of(ctor.newInstance(paramValue));
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315 } catch (ReflectiveOperationException e) {
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316 // does not type check and is not convertible - treat as if the parameter was never set
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317 return Optional.empty();
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318 }
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319 }
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320
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321 /**
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322 * Obtains a request parameter of the specified type.
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323 * The specified type must have a single-argument constructor accepting a string to perform conversion.
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324 * The constructor of the specified type may throw an exception on conversion failures.
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325 *
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326 * @param req the servlet request object
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327 * @param clazz the class object of the expected type
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328 * @param name the name of the parameter
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329 * @param <T> the expected type
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330 * @return the parameter value or an empty optional, if no parameter with the specified name was found
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331 */
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332 protected <T> Optional<T> getParameter(HttpServletRequest req, Class<T> clazz, String name) {
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333 if (clazz.isArray()) {
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334 final String[] paramValues = req.getParameterValues(name);
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335 int len = paramValues == null ? 0 : paramValues.length;
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336 final var array = (T) Array.newInstance(clazz.getComponentType(), len);
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337 for (int i = 0; i < len; i++) {
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338 try {
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339 final Constructor<?> ctor = clazz.getComponentType().getConstructor(String.class);
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340 Array.set(array, i, ctor.newInstance(paramValues[i]));
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341 } catch (ReflectiveOperationException e) {
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342 throw new RuntimeException(e);
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343 }
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344 }
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345 return Optional.of(array);
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346 } else {
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347 return parseParameter(req.getParameter(name), clazz);
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348 }
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349 }
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350
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351 /**
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352 * Tries to look up an entity with a key obtained from a request parameter.
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353 *
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354 * @param req the servlet request object
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355 * @param clazz the class representing the type of the request parameter
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356 * @param name the name of the request parameter
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357 * @param find the find function (typically a DAO function)
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358 * @param <T> the type of the request parameter
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359 * @param <R> the type of the looked up entity
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360 * @return the retrieved entity or an empty optional if there is no such entity or the request parameter was missing
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361 * @throws SQLException if the find function throws an exception
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362 */
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363 protected <T, R> Optional<R> findByParameter(HttpServletRequest req, Class<T> clazz, String name, SQLFindFunction<? super T, ? extends R> find) throws SQLException {
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364 final var param = getParameter(req, clazz, name);
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365 if (param.isPresent()) {
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366 return Optional.ofNullable(find.apply(param.get()));
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367 } else {
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368 return Optional.empty();
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369 }
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370 }
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371
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372 private String sanitizeRequestPath(HttpServletRequest req) {
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373 return Optional.ofNullable(req.getPathInfo()).orElse("/");
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374 }
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375
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376 private Optional<Map.Entry<PathPattern, Method>> findMapping(HttpMethod method, HttpServletRequest req) {
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377 return Optional.ofNullable(mappings.get(method)).flatMap(rm ->
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378 rm.entrySet().stream().filter(
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379 kv -> kv.getKey().matches(sanitizeRequestPath(req))
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380 ).findAny()
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381 );
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382 }
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383
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384 protected void renderSite(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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385 req.getRequestDispatcher(SITE_JSP).forward(req, resp);
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386 }
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387
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388 protected Optional<String[]> availableLanguages() {
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389 return Optional.ofNullable(getServletContext().getInitParameter(Constants.CTX_ATTR_LANGUAGES)).map((x) -> x.split("\\s*,\\s*"));
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390 }
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391
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392 private static String baseHref(HttpServletRequest req) {
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393 return String.format("%s://%s:%d%s/",
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394 req.getScheme(),
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395 req.getServerName(),
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396 req.getServerPort(),
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397 req.getContextPath());
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398 }
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399
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400 private static String enforceExt(String filename, String ext) {
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401 return filename.endsWith(ext) ? filename : filename + ext;
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402 }
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403
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404 private static String jspPath(String filename) {
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405 return enforceExt(Constants.JSP_PATH_PREFIX + filename, ".jsp");
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406 }
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407
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408 private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
160
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409 // the very first thing to do is to force UTF-8
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410 req.setCharacterEncoding("UTF-8");
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411
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412 // choose the requested language as session language (if available) or fall back to english, otherwise
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413 HttpSession session = req.getSession();
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414 if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) {
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415 Optional<List<String>> availableLanguages = availableLanguages().map(Arrays::asList);
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416 Optional<Locale> reqLocale = Optional.of(req.getLocale());
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417 Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH);
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418 session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale);
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419 LOG.debug("Setting language for new session {}: {}", session.getId(), sessionLocale.getDisplayLanguage());
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420 } else {
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421 Locale sessionLocale = (Locale) session.getAttribute(Constants.SESSION_ATTR_LANGUAGE);
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422 resp.setLocale(sessionLocale);
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423 LOG.trace("Continuing session {} with language {}", session.getId(), sessionLocale);
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424 }
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425
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426 // set some internal request attributes
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427 final String fullPath = req.getServletPath() + Optional.ofNullable(req.getPathInfo()).orElse("");
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428 req.setAttribute(Constants.REQ_ATTR_BASE_HREF, baseHref(req));
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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 req.setAttribute(Constants.REQ_ATTR_PATH, fullPath);
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bb4c52bf3439 bloat removal 2/3 - moduleInfo
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430 req.setAttribute(Constants.REQ_ATTR_RESOURCE_BUNDLE, getResourceBundleName());
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824d4042c857 cleanup and simplification of database access layer
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parents: 33
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431
53
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432 // if this is an error path, bypass the normal flow
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parents: 47
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433 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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parents: 47
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434 final var mapping = findMapping(method, req);
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parents: 47
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435 if (mapping.isPresent()) {
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436 invokeMapping(mapping.get(), req, resp, null);
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parents: 47
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437 }
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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parents: 47
diff changeset
438 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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parents: 47
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439 }
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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parents: 47
diff changeset
440
38
cf85ef18f231 adds DAO for Project entity and save/update methods
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441 // obtain a connection and create the data access objects
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442 final var db = (DataSourceProvider) req.getServletContext().getAttribute(DataSourceProvider.Companion.getSC_ATTR_NAME());
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parents: 47
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443 final var ds = db.getDataSource();
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parents: 47
diff changeset
444 if (ds == null) {
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parents: 47
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445 resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, "JNDI DataSource lookup failed. See log for details.");
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parents: 47
diff changeset
446 return;
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parents: 47
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447 }
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parents: 47
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448 try (final var connection = ds.getConnection()) {
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449 final var dao = createDataAccessObjects(connection);
39
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450 try {
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451 connection.setAutoCommit(false);
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452 // call the handler, if available, or send an HTTP 404 error
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parents: 38
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453 final var mapping = findMapping(method, req);
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parents: 38
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454 if (mapping.isPresent()) {
157
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455 invokeMapping(mapping.get(), req, resp, dao);
39
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456 } else {
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457 resp.sendError(HttpServletResponse.SC_NOT_FOUND);
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458 }
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459 connection.commit();
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460 } catch (SQLException ex) {
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461 LOG.warn("Database transaction failed (Code {}): {}", ex.getErrorCode(), ex.getMessage());
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462 LOG.debug("Details: ", ex);
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parents: 53
diff changeset
463 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Unhandled Transaction Error - Code: " + ex.getErrorCode());
39
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parents: 38
diff changeset
464 connection.rollback();
38
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Mike Becker <universe@uap-core.de>
parents: 36
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465 }
cf85ef18f231 adds DAO for Project entity and save/update methods
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parents: 36
diff changeset
466 } catch (SQLException ex) {
39
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parents: 38
diff changeset
467 LOG.error("Severe Database Exception (Code {}): {}", ex.getErrorCode(), ex.getMessage());
38
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parents: 36
diff changeset
468 LOG.debug("Details: ", ex);
54
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parents: 53
diff changeset
469 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database Error - Code: " + ex.getErrorCode());
12
005d27918b57 implements ResponseTypes
Mike Becker <universe@uap-core.de>
parents: 11
diff changeset
470 }
005d27918b57 implements ResponseTypes
Mike Becker <universe@uap-core.de>
parents: 11
diff changeset
471 }
34
824d4042c857 cleanup and simplification of database access layer
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parents: 33
diff changeset
472
7
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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parents:
diff changeset
473 @Override
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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parents:
diff changeset
474 protected final void doGet(HttpServletRequest req, HttpServletResponse resp)
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parents:
diff changeset
475 throws ServletException, IOException {
12
005d27918b57 implements ResponseTypes
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parents: 11
diff changeset
476 doProcess(HttpMethod.GET, req, resp);
7
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parents:
diff changeset
477 }
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff changeset
478
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff changeset
479 @Override
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parents:
diff changeset
480 protected final void doPost(HttpServletRequest req, HttpServletResponse resp)
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parents:
diff changeset
481 throws ServletException, IOException {
12
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parents: 11
diff changeset
482 doProcess(HttpMethod.POST, req, resp);
7
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parents:
diff changeset
483 }
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff changeset
484 }

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