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

Thu, 19 Nov 2020 13:58:54 +0100

author
mike@uapl01.localdomain
date
Thu, 19 Nov 2020 13:58:54 +0100
changeset 159
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parent 158
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child 160
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permissions
-rw-r--r--

migrates DAO classes

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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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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 = 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<PathPattern, 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 DaoProvider createDataAccessObjects(Connection connection) throws SQLException {
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104 final var df = (DataSourceProvider) getServletContext().getAttribute(DataSourceProvider.Companion.getSC_ATTR_NAME());
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105 if (df.getDialect() == DataSourceProvider.Dialect.Postgres) {
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106 return new PGDaoProvider(connection);
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107 }
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108 throw new UnsupportedOperationException("Non-exhaustive if-else - this is a bug.");
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109 }
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110
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111 private void invokeMapping(Map.Entry<PathPattern, Method> mapping, HttpServletRequest req, HttpServletResponse resp, DaoProvider dao) throws IOException {
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112 final var pathPattern = mapping.getKey();
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113 final var method = mapping.getValue();
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114 try {
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115 LOG.trace("invoke {}#{}", method.getDeclaringClass().getName(), method.getName());
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116 final var paramTypes = method.getParameterTypes();
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117 final var paramValues = new Object[paramTypes.length];
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118 for (int i = 0; i < paramTypes.length; i++) {
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119 if (paramTypes[i].isAssignableFrom(HttpServletRequest.class)) {
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120 paramValues[i] = req;
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121 } else if (paramTypes[i].isAssignableFrom(HttpServletResponse.class)) {
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122 paramValues[i] = resp;
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123 }
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124 if (paramTypes[i].isAssignableFrom(DaoProvider.class)) {
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125 paramValues[i] = dao;
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126 }
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127 if (paramTypes[i].isAssignableFrom(PathParameters.class)) {
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128 paramValues[i] = pathPattern.obtainPathParameters(sanitizeRequestPath(req));
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129 }
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130 }
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131 method.invoke(this, paramValues);
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132 } catch (InvocationTargetException ex) {
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133 LOG.error("invocation of method {}::{} failed: {}",
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134 method.getDeclaringClass().getName(), method.getName(), ex.getTargetException().getMessage());
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135 LOG.debug("Details: ", ex.getTargetException());
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136 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex.getTargetException().getMessage());
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137 } catch (ReflectiveOperationException | ClassCastException ex) {
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138 LOG.error("invocation of method {}::{} failed: {}",
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139 method.getDeclaringClass().getName(), method.getName(), ex.getMessage());
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140 LOG.debug("Details: ", ex);
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141 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, ex.getMessage());
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142 }
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143 }
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144
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145 @Override
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146 public void init() throws ServletException {
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147 scanForRequestMappings();
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148
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149 LOG.trace("{} initialized", getServletName());
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150 }
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151
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152 private void scanForRequestMappings() {
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153 try {
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154 Method[] methods = getClass().getDeclaredMethods();
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155 for (Method method : methods) {
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156 Optional<RequestMapping> mapping = Optional.ofNullable(method.getAnnotation(RequestMapping.class));
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157 if (mapping.isPresent()) {
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158 if (mapping.get().requestPath().isBlank()) {
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159 LOG.warn("{} is annotated with {} but request path is empty",
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160 method.getName(), RequestMapping.class.getSimpleName()
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161 );
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162 continue;
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163 }
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164
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165 if (!Modifier.isPublic(method.getModifiers())) {
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166 LOG.warn("{} is annotated with {} but is not public",
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167 method.getName(), RequestMapping.class.getSimpleName()
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168 );
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169 continue;
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170 }
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171 if (Modifier.isAbstract(method.getModifiers())) {
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172 LOG.warn("{} is annotated with {} but is abstract",
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173 method.getName(), RequestMapping.class.getSimpleName()
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174 );
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175 continue;
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176 }
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177
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178 boolean paramsInjectible = true;
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179 for (var param : method.getParameterTypes()) {
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180 paramsInjectible &= HttpServletRequest.class.isAssignableFrom(param)
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181 || HttpServletResponse.class.isAssignableFrom(param)
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182 || PathParameters.class.isAssignableFrom(param)
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183 || DaoProvider.class.isAssignableFrom(param);
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184 }
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185 if (paramsInjectible) {
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186 try {
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187 PathPattern pathPattern = new PathPattern(mapping.get().requestPath());
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188
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189 final var methodMappings = mappings.computeIfAbsent(mapping.get().method(), k -> new HashMap<>());
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190 final var currentMapping = methodMappings.putIfAbsent(pathPattern, method);
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191 if (currentMapping != null) {
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192 LOG.warn("Cannot map {} {} to {} in class {} - this would override the mapping to {}",
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193 mapping.get().method(),
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194 mapping.get().requestPath(),
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195 method.getName(),
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196 getClass().getSimpleName(),
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197 currentMapping.getName()
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198 );
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199 }
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200
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201 LOG.debug("{} {} maps to {}::{}",
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202 mapping.get().method(),
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203 mapping.get().requestPath(),
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204 getClass().getSimpleName(),
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205 method.getName()
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206 );
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207 } catch (IllegalArgumentException ex) {
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208 LOG.warn("Request mapping for {} failed: path pattern '{}' is syntactically invalid",
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209 method.getName(), mapping.get().requestPath()
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210 );
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211 }
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212 } else {
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213 LOG.warn("{} is annotated with {} but has the wrong parameters - only HttpServletRequest, HttpServletResponse, PathParameters, and DataAccessObjects are allowed",
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214 method.getName(), RequestMapping.class.getSimpleName()
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215 );
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216 }
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217 }
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218 }
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219 } catch (SecurityException ex) {
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220 LOG.error("Scan for request mappings on declared methods failed.", ex);
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221 }
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222 }
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223
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224 @Override
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225 public void destroy() {
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226 mappings.clear();
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227 LOG.trace("{} destroyed", getServletName());
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228 }
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229
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230 /**
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231 * Sets the name of the content page.
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232 * <p>
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233 * It is sufficient to specify the name without any extension. The extension
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234 * is added automatically if not specified.
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235 *
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236 * @param req the servlet request object
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237 * @param pageName the name of the content page
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238 * @see Constants#REQ_ATTR_CONTENT_PAGE
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239 */
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240 protected void setContentPage(HttpServletRequest req, String pageName) {
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241 req.setAttribute(Constants.REQ_ATTR_CONTENT_PAGE, jspPath(pageName));
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242 }
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243
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244 /**
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245 * Sets the navigation menu.
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246 *
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247 * @param req the servlet request object
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248 * @param jspName the name of the menu's jsp file
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249 * @see Constants#REQ_ATTR_NAVIGATION
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250 */
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251 protected void setNavigationMenu(HttpServletRequest req, String jspName) {
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252 req.setAttribute(Constants.REQ_ATTR_NAVIGATION, jspPath(jspName));
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253 }
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254
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255 /**
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256 * @param req the servlet request object
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257 * @param location the location where to redirect
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258 * @see Constants#REQ_ATTR_REDIRECT_LOCATION
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259 */
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260 protected void setRedirectLocation(HttpServletRequest req, String location) {
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261 if (location.startsWith("./")) {
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262 location = location.replaceFirst("\\./", baseHref(req));
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263 }
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264 req.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, location);
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265 }
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266
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267 /**
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268 * Specifies the name of an additional stylesheet used by the module.
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269 * <p>
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270 * Setting an additional stylesheet is optional, but quite common for HTML
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271 * output.
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272 * <p>
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273 * It is sufficient to specify the name without any extension. The extension
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274 * is added automatically if not specified.
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275 *
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276 * @param req the servlet request object
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277 * @param stylesheet the name of the stylesheet
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278 */
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279 public void setStylesheet(HttpServletRequest req, String stylesheet) {
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280 req.setAttribute(Constants.REQ_ATTR_STYLESHEET, enforceExt(stylesheet, ".css"));
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281 }
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282
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283 /**
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284 * Sets the view model object.
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285 * The type must match the expected type in the JSP file.
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286 *
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287 * @param req the servlet request object
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288 * @param viewModel the view model object
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289 */
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290 public void setViewModel(HttpServletRequest req, Object viewModel) {
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291 req.setAttribute(Constants.REQ_ATTR_VIEWMODEL, viewModel);
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292 }
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293
131
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294 private <T> Optional<T> parseParameter(String paramValue, Class<T> clazz) {
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295 if (paramValue == null) return Optional.empty();
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296 if (clazz.equals(Boolean.class)) {
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297 if (paramValue.toLowerCase().equals("false") || paramValue.equals("0")) {
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298 return Optional.of((T) Boolean.FALSE);
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299 } else {
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300 return Optional.of((T) Boolean.TRUE);
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301 }
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302 }
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303 if (clazz.equals(String.class)) return Optional.of((T) paramValue);
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304 if (java.sql.Date.class.isAssignableFrom(clazz)) {
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305 try {
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306 return Optional.of((T) java.sql.Date.valueOf(paramValue));
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307 } catch (IllegalArgumentException ex) {
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308 return Optional.empty();
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309 }
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310 }
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311 try {
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312 final Constructor<T> ctor = clazz.getConstructor(String.class);
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313 return Optional.of(ctor.newInstance(paramValue));
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314 } catch (ReflectiveOperationException e) {
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315 // does not type check and is not convertible - treat as if the parameter was never set
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316 return Optional.empty();
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317 }
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318 }
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319
86
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320 /**
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321 * Obtains a request parameter of the specified type.
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322 * The specified type must have a single-argument constructor accepting a string to perform conversion.
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323 * The constructor of the specified type may throw an exception on conversion failures.
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324 *
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325 * @param req the servlet request object
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326 * @param clazz the class object of the expected type
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327 * @param name the name of the parameter
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328 * @param <T> the expected type
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329 * @return the parameter value or an empty optional, if no parameter with the specified name was found
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330 */
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331 protected <T> Optional<T> getParameter(HttpServletRequest req, Class<T> clazz, String name) {
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332 if (clazz.isArray()) {
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333 final String[] paramValues = req.getParameterValues(name);
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334 int len = paramValues == null ? 0 : paramValues.length;
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335 final var array = (T) Array.newInstance(clazz.getComponentType(), len);
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336 for (int i = 0; i < len; i++) {
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337 try {
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338 final Constructor<?> ctor = clazz.getComponentType().getConstructor(String.class);
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339 Array.set(array, i, ctor.newInstance(paramValues[i]));
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340 } catch (ReflectiveOperationException e) {
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341 throw new RuntimeException(e);
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342 }
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343 }
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344 return Optional.of(array);
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345 } else {
131
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346 return parseParameter(req.getParameter(name), clazz);
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347 }
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348 }
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349
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350 /**
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351 * Tries to look up an entity with a key obtained from a request parameter.
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352 *
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353 * @param req the servlet request object
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354 * @param clazz the class representing the type of the request parameter
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355 * @param name the name of the request parameter
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356 * @param find the find function (typically a DAO function)
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357 * @param <T> the type of the request parameter
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358 * @param <R> the type of the looked up entity
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359 * @return the retrieved entity or an empty optional if there is no such entity or the request parameter was missing
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360 * @throws SQLException if the find function throws an exception
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361 */
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362 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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363 final var param = getParameter(req, clazz, name);
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364 if (param.isPresent()) {
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365 return Optional.ofNullable(find.apply(param.get()));
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366 } else {
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367 return Optional.empty();
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368 }
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369 }
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370
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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<Map.Entry<PathPattern, Method>> findMapping(HttpMethod method, HttpServletRequest req) {
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376 return Optional.ofNullable(mappings.get(method)).flatMap(rm ->
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377 rm.entrySet().stream().filter(
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378 kv -> kv.getKey().matches(sanitizeRequestPath(req))
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379 ).findAny()
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380 );
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381 }
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382
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383 protected void renderSite(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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384 req.getRequestDispatcher(SITE_JSP).forward(req, resp);
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385 }
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386
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387 protected Optional<String[]> availableLanguages() {
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388 return Optional.ofNullable(getServletContext().getInitParameter(Constants.CTX_ATTR_LANGUAGES)).map((x) -> x.split("\\s*,\\s*"));
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389 }
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390
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391 private static String baseHref(HttpServletRequest req) {
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392 return String.format("%s://%s:%d%s/",
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393 req.getScheme(),
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394 req.getServerName(),
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395 req.getServerPort(),
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396 req.getContextPath());
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397 }
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398
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399 private static String enforceExt(String filename, String ext) {
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400 return filename.endsWith(ext) ? filename : filename + ext;
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401 }
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402
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403 private static String jspPath(String filename) {
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404 return enforceExt(Constants.JSP_PATH_PREFIX + filename, ".jsp");
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405 }
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406
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407 private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
27
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408
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409 // choose the requested language as session language (if available) or fall back to english, otherwise
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410 HttpSession session = req.getSession();
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411 if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) {
158
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412 Optional<List<String>> availableLanguages = availableLanguages().map(Arrays::asList);
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413 Optional<Locale> reqLocale = Optional.of(req.getLocale());
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414 Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH);
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415 session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale);
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416 LOG.debug("Setting language for new session {}: {}", session.getId(), sessionLocale.getDisplayLanguage());
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417 } else {
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418 Locale sessionLocale = (Locale) session.getAttribute(Constants.SESSION_ATTR_LANGUAGE);
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419 resp.setLocale(sessionLocale);
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420 LOG.trace("Continuing session {} with language {}", session.getId(), sessionLocale);
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421 }
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422
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423 // set some internal request attributes
158
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424 final String fullPath = req.getServletPath() + Optional.ofNullable(req.getPathInfo()).orElse("");
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425 req.setAttribute(Constants.REQ_ATTR_BASE_HREF, baseHref(req));
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426 req.setAttribute(Constants.REQ_ATTR_PATH, fullPath);
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427 req.setAttribute(Constants.REQ_ATTR_RESOURCE_BUNDLE, getResourceBundleName());
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428
53
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429 // if this is an error path, bypass the normal flow
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430 if (fullPath.startsWith("/error/")) {
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431 final var mapping = findMapping(method, req);
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432 if (mapping.isPresent()) {
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433 invokeMapping(mapping.get(), req, resp, null);
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434 }
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435 return;
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436 }
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437
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438 // obtain a connection and create the data access objects
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439 final var db = (DataSourceProvider) req.getServletContext().getAttribute(DataSourceProvider.Companion.getSC_ATTR_NAME());
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440 final var ds = db.getDataSource();
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441 if (ds == null) {
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442 resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, "JNDI DataSource lookup failed. See log for details.");
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443 return;
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444 }
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445 try (final var connection = ds.getConnection()) {
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446 final var dao = createDataAccessObjects(connection);
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447 try {
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448 connection.setAutoCommit(false);
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449 // call the handler, if available, or send an HTTP 404 error
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450 final var mapping = findMapping(method, req);
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451 if (mapping.isPresent()) {
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452 invokeMapping(mapping.get(), req, resp, dao);
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453 } else {
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454 resp.sendError(HttpServletResponse.SC_NOT_FOUND);
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455 }
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456 connection.commit();
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457 } catch (SQLException ex) {
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458 LOG.warn("Database transaction failed (Code {}): {}", ex.getErrorCode(), ex.getMessage());
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459 LOG.debug("Details: ", ex);
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460 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Unhandled Transaction Error - Code: " + ex.getErrorCode());
39
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461 connection.rollback();
38
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462 }
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463 } catch (SQLException ex) {
39
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464 LOG.error("Severe Database Exception (Code {}): {}", ex.getErrorCode(), ex.getMessage());
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465 LOG.debug("Details: ", ex);
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diff changeset
466 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database Error - Code: " + ex.getErrorCode());
12
005d27918b57 implements ResponseTypes
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parents: 11
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467 }
005d27918b57 implements ResponseTypes
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parents: 11
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468 }
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diff changeset
469
7
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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470 @Override
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471 protected final void doGet(HttpServletRequest req, HttpServletResponse resp)
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parents:
diff changeset
472 throws ServletException, IOException {
12
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diff changeset
473 doProcess(HttpMethod.GET, req, resp);
7
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parents:
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474 }
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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parents:
diff changeset
475
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff changeset
476 @Override
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parents:
diff changeset
477 protected final void doPost(HttpServletRequest req, HttpServletResponse resp)
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parents:
diff changeset
478 throws ServletException, IOException {
12
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diff changeset
479 doProcess(HttpMethod.POST, req, resp);
7
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parents:
diff changeset
480 }
598670d5b0b8 core functionality should also use the modules system, changed the code structure accordingly
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parents:
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481 }

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