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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 2017 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 java.io.IOException; |
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32 | import java.lang.reflect.Method; |
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33 | import java.lang.reflect.Modifier; |
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34 | import java.util.Arrays; |
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35 | import java.util.HashMap; |
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36 | import java.util.List; |
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37 | import java.util.Locale; |
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38 | import java.util.Map; |
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39 | import java.util.Optional; |
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40 | import javax.servlet.ServletException; |
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41 | import javax.servlet.http.HttpServlet; |
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42 | import javax.servlet.http.HttpServletRequest; |
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43 | import javax.servlet.http.HttpServletResponse; |
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44 | import javax.servlet.http.HttpSession; |
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45 | import org.slf4j.Logger; |
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46 | import org.slf4j.LoggerFactory; |
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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"); |
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57 | |
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58 | /** |
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59 | * Store a reference to the annotation for quicker access. |
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60 | */ |
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61 | private Optional<LightPITModule> moduleInfo = Optional.empty(); |
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62 | |
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63 | /** |
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64 | * The EL proxy is necessary, because the EL resolver cannot handle annotation properties. |
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65 | */ |
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66 | private Optional<LightPITModule.ELProxy> moduleInfoELProxy = Optional.empty(); |
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67 | |
12 | 68 | |
69 | @FunctionalInterface | |
70 | private static interface HandlerMethod { | |
71 | ResponseType apply(HttpServletRequest t, HttpServletResponse u) throws IOException, ServletException; | |
72 | } | |
73 | ||
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74 | /** |
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75 | * Invocation mapping gathered from the {@link RequestMapping} annotations. |
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76 | * |
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77 | * Paths in this map must always start with a leading slash, although |
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78 | * the specification in the annotation must not start with a leading slash. |
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79 | * |
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80 | * The reason for this is the different handling of empty paths in |
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81 | * {@link HttpServletRequest#getPathInfo()}. |
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82 | */ |
12 | 83 | private final Map<HttpMethod, Map<String, HandlerMethod>> mappings = new HashMap<>(); |
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84 | |
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85 | /** |
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86 | * Gives implementing modules access to the {@link ModuleManager}. |
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87 | * @return the module manager |
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88 | */ |
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89 | protected final ModuleManager getModuleManager() { |
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90 | return (ModuleManager) getServletContext().getAttribute(ModuleManager.SC_ATTR_NAME); |
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91 | } |
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92 | |
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93 | /** |
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94 | * Gives implementing modules access to the {@link DatabaseFacade}. |
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95 | * @return the database facade |
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96 | */ |
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97 | protected final DatabaseFacade getDatabaseFacade() { |
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98 | return (DatabaseFacade) getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME); |
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99 | } |
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100 | |
12 | 101 | private ResponseType invokeMapping(Method method, HttpServletRequest req, HttpServletResponse resp) |
102 | throws IOException, ServletException { | |
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103 | try { |
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104 | LOG.trace("invoke {}#{}", method.getDeclaringClass().getName(), method.getName()); |
12 | 105 | return (ResponseType) method.invoke(this, req, resp); |
106 | } catch (ReflectiveOperationException | ClassCastException ex) { | |
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107 | LOG.error(String.format("invocation of method %s failed", method.getName()), ex); |
12 | 108 | resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); |
109 | return ResponseType.NONE; | |
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110 | } |
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111 | } |
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112 | |
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113 | @Override |
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114 | public void init() throws ServletException { |
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115 | moduleInfo = Optional.ofNullable(this.getClass().getAnnotation(LightPITModule.class)); |
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116 | moduleInfoELProxy = moduleInfo.map(LightPITModule.ELProxy::convert); |
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117 | |
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118 | if (moduleInfo.isPresent()) { |
12 | 119 | scanForRequestMappings(); |
120 | } | |
121 | ||
122 | LOG.trace("{} initialized", getServletName()); | |
123 | } | |
124 | ||
125 | private void scanForRequestMappings() { | |
126 | try { | |
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127 | Method[] methods = getClass().getDeclaredMethods(); |
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128 | for (Method method : methods) { |
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129 | Optional<RequestMapping> mapping = Optional.ofNullable(method.getAnnotation(RequestMapping.class)); |
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130 | if (mapping.isPresent()) { |
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131 | if (!Modifier.isPublic(method.getModifiers())) { |
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132 | LOG.warn("{} is annotated with {} but is not public", |
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133 | method.getName(), RequestMapping.class.getSimpleName() |
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134 | ); |
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135 | continue; |
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136 | } |
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137 | if (Modifier.isAbstract(method.getModifiers())) { |
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138 | LOG.warn("{} is annotated with {} but is abstract", |
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139 | method.getName(), RequestMapping.class.getSimpleName() |
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140 | ); |
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141 | continue; |
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142 | } |
12 | 143 | if (!ResponseType.class.isAssignableFrom(method.getReturnType())) { |
144 | LOG.warn("{} is annotated with {} but has the wrong return type - 'ResponseType' required", | |
145 | method.getName(), RequestMapping.class.getSimpleName() | |
146 | ); | |
147 | continue; | |
148 | } | |
149 | ||
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150 | Class<?>[] params = method.getParameterTypes(); |
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151 | if (params.length == 2 |
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152 | && HttpServletRequest.class.isAssignableFrom(params[0]) |
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153 | && HttpServletResponse.class.isAssignableFrom(params[1])) { |
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154 | |
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155 | final String requestPath = "/"+mapping.get().requestPath(); |
12 | 156 | |
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157 | if (mappings.computeIfAbsent(mapping.get().method(), k -> new HashMap<>()). |
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158 | putIfAbsent(requestPath, |
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159 | (req, resp) -> invokeMapping(method, req, resp)) != null) { |
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160 | LOG.warn("{} {} has multiple mappings", |
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161 | mapping.get().method(), |
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162 | mapping.get().requestPath() |
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163 | ); |
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164 | } |
12 | 165 | |
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166 | LOG.debug("{} {} maps to {}::{}", |
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167 | mapping.get().method(), |
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168 | requestPath, |
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169 | getClass().getSimpleName(), |
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170 | method.getName() |
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171 | ); |
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172 | } else { |
12 | 173 | LOG.warn("{} is annotated with {} but has the wrong parameters - (HttpServletRequest,HttpServletResponse) required", |
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174 | method.getName(), RequestMapping.class.getSimpleName() |
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175 | ); |
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176 | } |
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177 | } |
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178 | } |
12 | 179 | } catch (SecurityException ex) { |
180 | LOG.error("Scan for request mappings on declared methods failed.", ex); | |
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181 | } |
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182 | } |
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183 | |
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184 | @Override |
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185 | public void destroy() { |
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186 | mappings.clear(); |
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187 | LOG.trace("{} destroyed", getServletName()); |
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188 | } |
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189 | |
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190 | /** |
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191 | * Sets the name of the dynamic fragment. |
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192 | * |
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193 | * It is sufficient to specify the name without any extension. The extension |
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194 | * is added automatically if not specified. |
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195 | * |
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196 | * The fragment must be located in the dynamic fragments folder. |
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197 | * |
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198 | * @param req the servlet request object |
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199 | * @param fragmentName the name of the fragment |
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200 | * @see Constants#DYN_FRAGMENT_PATH_PREFIX |
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201 | */ |
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202 | public void setDynamicFragment(HttpServletRequest req, String fragmentName) { |
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203 | req.setAttribute(Constants.REQ_ATTR_FRAGMENT, Functions.dynFragmentPath(fragmentName)); |
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204 | } |
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205 | |
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206 | /** |
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207 | * Specifies the name of an additional stylesheet used by the module. |
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208 | * |
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209 | * Setting an additional stylesheet is optional, but quite common for HTML |
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210 | * output. |
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211 | * |
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212 | * It is sufficient to specify the name without any extension. The extension |
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213 | * is added automatically if not specified. |
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214 | * |
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215 | * @param req the servlet request object |
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216 | * @param stylesheet the name of the stylesheet |
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217 | */ |
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218 | public void setStylesheet(HttpServletRequest req, String stylesheet) { |
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219 | req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css")); |
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220 | } |
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221 | |
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222 | private void forwardToFullView(HttpServletRequest req, HttpServletResponse resp) |
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223 | throws IOException, ServletException { |
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224 | |
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225 | req.setAttribute(Constants.REQ_ATTR_MENU, getModuleManager().getMainMenu()); |
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226 | req.getRequestDispatcher(HTML_FULL_DISPATCHER).forward(req, resp); |
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227 | } |
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228 | |
12 | 229 | private Optional<HandlerMethod> findMapping(HttpMethod method, HttpServletRequest req) { |
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230 | return Optional.ofNullable(mappings.get(method)).map( |
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231 | (rm) -> rm.get(Optional.ofNullable(req.getPathInfo()).orElse("/")) |
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232 | ); |
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233 | } |
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234 | |
12 | 235 | private void forwardAsSepcified(ResponseType type, HttpServletRequest req, HttpServletResponse resp) |
236 | throws ServletException, IOException { | |
237 | switch (type) { | |
238 | case NONE: return; | |
239 | case HTML_FULL: | |
240 | forwardToFullView(req, resp); | |
241 | return; | |
242 | // TODO: implement remaining response types | |
243 | default: | |
244 | // this code should be unreachable | |
245 | LOG.error("ResponseType switch is not exhaustive - this is a bug!"); | |
246 | throw new UnsupportedOperationException(); | |
247 | } | |
248 | } | |
249 | ||
250 | private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp) | |
251 | throws ServletException, IOException { | |
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252 | |
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253 | // Synchronize module information with database |
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254 | getModuleManager().syncWithDatabase(getDatabaseFacade()); |
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255 | |
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256 | // choose the requested language as session language (if available) or fall back to english, otherwise |
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257 | HttpSession session = req.getSession(); |
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258 | if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) { |
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259 | Optional<List<String>> availableLanguages = Functions.availableLanguages(getServletContext()).map(Arrays::asList); |
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260 | Optional<Locale> reqLocale = Optional.of(req.getLocale()); |
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261 | Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH); |
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262 | session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale); |
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263 | LOG.debug("Settng language for new session {}: {}", session.getId(), sessionLocale.getDisplayLanguage()); |
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264 | } else { |
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265 | Locale sessionLocale = (Locale) session.getAttribute(Constants.SESSION_ATTR_LANGUAGE); |
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266 | resp.setLocale(sessionLocale); |
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267 | LOG.trace("Continuing session {} with language {}", session.getId(), sessionLocale); |
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268 | } |
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269 | |
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270 | // set some internal request attributes |
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271 | req.setAttribute(Constants.REQ_ATTR_PATH, Functions.fullPath(req)); |
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272 | req.setAttribute(Constants.REQ_ATTR_MODULE_CLASSNAME, this.getClass().getName()); |
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273 | moduleInfoELProxy.ifPresent((proxy) -> req.setAttribute(Constants.REQ_ATTR_MODULE_INFO, proxy)); |
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274 | |
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275 | |
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276 | // call the handler, if available, or send an HTTP 404 error |
12 | 277 | Optional<HandlerMethod> mapping = findMapping(method, req); |
278 | if (mapping.isPresent()) { | |
279 | forwardAsSepcified(mapping.get().apply(req, resp), req, resp); | |
280 | } else { | |
281 | resp.sendError(HttpServletResponse.SC_NOT_FOUND); | |
282 | } | |
283 | } | |
284 | ||
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285 | @Override |
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286 | protected final void doGet(HttpServletRequest req, HttpServletResponse resp) |
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Mike Becker <universe@uap-core.de>
parents:
diff
changeset
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287 | throws ServletException, IOException { |
12 | 288 | doProcess(HttpMethod.GET, req, resp); |
7
598670d5b0b8
core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff
changeset
|
289 | } |
598670d5b0b8
core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff
changeset
|
290 | |
598670d5b0b8
core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff
changeset
|
291 | @Override |
598670d5b0b8
core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff
changeset
|
292 | protected final void doPost(HttpServletRequest req, HttpServletResponse resp) |
598670d5b0b8
core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff
changeset
|
293 | throws ServletException, IOException { |
12 | 294 | doProcess(HttpMethod.POST, req, resp); |
7
598670d5b0b8
core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff
changeset
|
295 | } |
598670d5b0b8
core functionality should also use the modules system, changed the code structure accordingly
Mike Becker <universe@uap-core.de>
parents:
diff
changeset
|
296 | } |