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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 | * |
24 | 4 | * Copyright 2018 Mike Becker. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | */ |
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29 | package de.uapcore.lightpit; |
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30 | |
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31 | import de.uapcore.lightpit.dao.DataAccessObjects; |
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32 | import de.uapcore.lightpit.dao.postgres.PGDataAccessObjects; |
33 | 33 | import org.slf4j.Logger; |
34 | import org.slf4j.LoggerFactory; | |
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; |
33 | 41 | import java.io.IOException; |
42 | import java.lang.reflect.Method; | |
43 | import java.lang.reflect.Modifier; | |
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44 | import java.sql.Connection; |
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45 | import java.sql.SQLException; |
33 | 46 | import java.util.*; |
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47 | |
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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 {@link LightPITModule}s. |
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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 HTML_FULL_DISPATCHER = Functions.jspPath("html_full"); |
33 | 57 | |
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58 | /** |
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59 | * The EL proxy is necessary, because the EL resolver cannot handle annotation properties. |
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60 | */ |
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61 | private LightPITModule.ELProxy moduleInfo = null; |
33 | 62 | |
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63 | /** |
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64 | * Invocation mapping gathered from the {@link RequestMapping} annotations. |
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65 | * <p> |
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66 | * Paths in this map must always start with a leading slash, although |
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67 | * the specification in the annotation must not start with a leading slash. |
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68 | * <p> |
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69 | * The reason for this is the different handling of empty paths in |
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70 | * {@link HttpServletRequest#getPathInfo()}. |
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71 | */ |
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72 | private final Map<HttpMethod, Map<String, Method>> mappings = new HashMap<>(); |
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73 | |
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74 | /** |
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75 | * Gives implementing modules access to the {@link ModuleManager}. |
33 | 76 | * |
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77 | * @return the module manager |
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78 | */ |
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79 | protected final ModuleManager getModuleManager() { |
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80 | return (ModuleManager) getServletContext().getAttribute(ModuleManager.SC_ATTR_NAME); |
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81 | } |
33 | 82 | |
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83 | |
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84 | /** |
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85 | * Creates a set of data access objects for the specified connection. |
33 | 86 | * |
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87 | * @param connection the SQL connection |
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88 | * @return a set of data access objects |
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89 | */ |
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90 | private DataAccessObjects createDataAccessObjects(Connection connection) throws SQLException { |
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91 | final var df = (DatabaseFacade) getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME); |
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92 | if (df.getSQLDialect() == DatabaseFacade.Dialect.Postgres) { |
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93 | return new PGDataAccessObjects(connection); |
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94 | } |
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95 | throw new AssertionError("Non-exhaustive if-else - this is a bug."); |
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96 | } |
33 | 97 | |
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98 | private ResponseType invokeMapping(Method method, HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws IOException { |
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99 | try { |
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100 | LOG.trace("invoke {}#{}", method.getDeclaringClass().getName(), method.getName()); |
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101 | return (ResponseType) method.invoke(this, req, resp, dao); |
12 | 102 | } catch (ReflectiveOperationException | ClassCastException ex) { |
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103 | LOG.error("invocation of method {} failed: {}", method.getName(), ex.getMessage()); |
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104 | LOG.debug("Details: ", ex); |
12 | 105 | resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); |
106 | return ResponseType.NONE; | |
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107 | } |
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108 | } |
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109 | |
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110 | @Override |
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111 | public void init() throws ServletException { |
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112 | moduleInfo = Optional.ofNullable(this.getClass().getAnnotation(LightPITModule.class)) |
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113 | .map(LightPITModule.ELProxy::new).orElse(null); |
33 | 114 | |
115 | if (moduleInfo != null) { | |
12 | 116 | scanForRequestMappings(); |
117 | } | |
33 | 118 | |
12 | 119 | LOG.trace("{} initialized", getServletName()); |
120 | } | |
121 | ||
122 | private void scanForRequestMappings() { | |
123 | try { | |
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124 | Method[] methods = getClass().getDeclaredMethods(); |
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125 | for (Method method : methods) { |
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126 | Optional<RequestMapping> mapping = Optional.ofNullable(method.getAnnotation(RequestMapping.class)); |
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127 | if (mapping.isPresent()) { |
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128 | if (!Modifier.isPublic(method.getModifiers())) { |
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129 | LOG.warn("{} is annotated with {} but is not public", |
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130 | method.getName(), RequestMapping.class.getSimpleName() |
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131 | ); |
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132 | continue; |
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133 | } |
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134 | if (Modifier.isAbstract(method.getModifiers())) { |
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135 | LOG.warn("{} is annotated with {} but is abstract", |
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136 | method.getName(), RequestMapping.class.getSimpleName() |
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137 | ); |
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138 | continue; |
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139 | } |
12 | 140 | if (!ResponseType.class.isAssignableFrom(method.getReturnType())) { |
141 | LOG.warn("{} is annotated with {} but has the wrong return type - 'ResponseType' required", | |
142 | method.getName(), RequestMapping.class.getSimpleName() | |
143 | ); | |
144 | continue; | |
145 | } | |
146 | ||
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147 | Class<?>[] params = method.getParameterTypes(); |
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148 | if (params.length == 3 |
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149 | && HttpServletRequest.class.isAssignableFrom(params[0]) |
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150 | && HttpServletResponse.class.isAssignableFrom(params[1]) |
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151 | && DataAccessObjects.class.isAssignableFrom(params[2])) { |
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152 | |
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153 | final String requestPath = "/" + mapping.get().requestPath(); |
12 | 154 | |
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155 | if (mappings |
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156 | .computeIfAbsent(mapping.get().method(), k -> new HashMap<>()) |
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157 | .putIfAbsent(requestPath, method) != null) { |
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158 | LOG.warn("{} {} has multiple mappings", |
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159 | mapping.get().method(), |
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160 | mapping.get().requestPath() |
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161 | ); |
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162 | } |
12 | 163 | |
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164 | LOG.debug("{} {} maps to {}::{}", |
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165 | mapping.get().method(), |
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166 | requestPath, |
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167 | getClass().getSimpleName(), |
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168 | method.getName() |
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169 | ); |
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170 | } else { |
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171 | LOG.warn("{} is annotated with {} but has the wrong parameters - (HttpServletRequest,HttpServletResponse,DataAccessObjects) required", |
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172 | method.getName(), RequestMapping.class.getSimpleName() |
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173 | ); |
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174 | } |
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175 | } |
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176 | } |
12 | 177 | } catch (SecurityException ex) { |
178 | LOG.error("Scan for request mappings on declared methods failed.", ex); | |
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179 | } |
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180 | } |
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181 | |
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182 | @Override |
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183 | public void destroy() { |
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184 | mappings.clear(); |
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185 | LOG.trace("{} destroyed", getServletName()); |
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186 | } |
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187 | |
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188 | /** |
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189 | * Sets the name of the dynamic fragment. |
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190 | * <p> |
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191 | * It is sufficient to specify the name without any extension. The extension |
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192 | * is added automatically if not specified. |
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193 | * <p> |
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194 | * The fragment must be located in the dynamic fragments folder. |
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195 | * |
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196 | * @param req the servlet request object |
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197 | * @param fragmentName the name of the fragment |
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198 | * @see Constants#DYN_FRAGMENT_PATH_PREFIX |
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199 | */ |
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200 | public void setDynamicFragment(HttpServletRequest req, String fragmentName) { |
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201 | req.setAttribute(Constants.REQ_ATTR_FRAGMENT, Functions.dynFragmentPath(fragmentName)); |
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202 | } |
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203 | |
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204 | /** |
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205 | * Specifies the name of an additional stylesheet used by the module. |
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206 | * <p> |
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207 | * Setting an additional stylesheet is optional, but quite common for HTML |
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208 | * output. |
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209 | * <p> |
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210 | * It is sufficient to specify the name without any extension. The extension |
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211 | * is added automatically if not specified. |
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212 | * |
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213 | * @param req the servlet request object |
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214 | * @param stylesheet the name of the stylesheet |
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215 | */ |
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216 | public void setStylesheet(HttpServletRequest req, String stylesheet) { |
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217 | req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css")); |
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218 | } |
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219 | |
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220 | private void forwardToFullView(HttpServletRequest req, HttpServletResponse resp) |
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221 | throws IOException, ServletException { |
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222 | |
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223 | req.setAttribute(Constants.REQ_ATTR_MENU, getModuleManager().getMainMenu()); |
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224 | req.getRequestDispatcher(HTML_FULL_DISPATCHER).forward(req, resp); |
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225 | } |
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226 | |
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227 | private Optional<Method> findMapping(HttpMethod method, HttpServletRequest req) { |
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228 | return Optional.ofNullable(mappings.get(method)) |
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229 | .map(rm -> rm.get(Optional.ofNullable(req.getPathInfo()).orElse("/")) |
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230 | ); |
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231 | } |
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232 | |
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233 | private void forwardAsSpecified(ResponseType type, HttpServletRequest req, HttpServletResponse resp) |
12 | 234 | throws ServletException, IOException { |
235 | switch (type) { | |
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236 | case NONE: |
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237 | return; |
12 | 238 | case HTML_FULL: |
239 | forwardToFullView(req, resp); | |
240 | return; | |
241 | // TODO: implement remaining response types | |
242 | default: | |
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243 | throw new AssertionError("ResponseType switch is not exhaustive - this is a bug!"); |
12 | 244 | } |
245 | } | |
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246 | |
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247 | private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { |
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248 | |
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249 | // choose the requested language as session language (if available) or fall back to english, otherwise |
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250 | HttpSession session = req.getSession(); |
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251 | if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) { |
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252 | Optional<List<String>> availableLanguages = Functions.availableLanguages(getServletContext()).map(Arrays::asList); |
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253 | Optional<Locale> reqLocale = Optional.of(req.getLocale()); |
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254 | Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH); |
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255 | session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale); |
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256 | LOG.debug("Setting language for new session {}: {}", session.getId(), sessionLocale.getDisplayLanguage()); |
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257 | } else { |
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258 | Locale sessionLocale = (Locale) session.getAttribute(Constants.SESSION_ATTR_LANGUAGE); |
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259 | resp.setLocale(sessionLocale); |
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260 | LOG.trace("Continuing session {} with language {}", session.getId(), sessionLocale); |
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261 | } |
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262 | |
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263 | // set some internal request attributes |
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264 | req.setAttribute(Constants.REQ_ATTR_PATH, Functions.fullPath(req)); |
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265 | req.setAttribute(Constants.REQ_ATTR_MODULE_CLASSNAME, this.getClass().getName()); |
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266 | Optional.ofNullable(moduleInfo).ifPresent((proxy) -> req.setAttribute(Constants.REQ_ATTR_MODULE_INFO, proxy)); |
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267 | |
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268 | // obtain a connection and create the data access objects |
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269 | final var db = (DatabaseFacade) req.getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME); |
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270 | try (final var connection = db.getDataSource().getConnection()) { |
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271 | final var dao = createDataAccessObjects(connection); |
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272 | try { |
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273 | connection.setAutoCommit(false); |
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274 | // call the handler, if available, or send an HTTP 404 error |
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275 | final var mapping = findMapping(method, req); |
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276 | if (mapping.isPresent()) { |
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277 | forwardAsSpecified(invokeMapping(mapping.get(), req, resp, dao), req, resp); |
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278 | } else { |
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279 | resp.sendError(HttpServletResponse.SC_NOT_FOUND); |
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280 | } |
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281 | connection.commit(); |
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282 | } catch (SQLException ex) { |
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283 | LOG.warn("Database transaction failed (Code {}): {}", ex.getErrorCode(), ex.getMessage()); |
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284 | LOG.debug("Details: ", ex); |
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285 | resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Unhandled Transaction Error - Code:" + ex.getErrorCode()); |
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286 | connection.rollback(); |
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287 | } |
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288 | } catch (SQLException ex) { |
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289 | LOG.error("Severe Database Exception (Code {}): {}", ex.getErrorCode(), ex.getMessage()); |
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290 | LOG.debug("Details: ", ex); |
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291 | resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database Error - Code:" + ex.getErrorCode()); |
12 | 292 | } |
293 | } | |
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294 | |
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295 | @Override |
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296 | protected final void doGet(HttpServletRequest req, HttpServletResponse resp) |
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297 | throws ServletException, IOException { |
12 | 298 | doProcess(HttpMethod.GET, req, resp); |
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299 | } |
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300 | |
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301 | @Override |
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302 | protected final void doPost(HttpServletRequest req, HttpServletResponse resp) |
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303 | throws ServletException, IOException { |
12 | 304 | doProcess(HttpMethod.POST, req, resp); |
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305 | } |
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306 | } |