src/main/kotlin/de/uapcore/lightpit/AbstractServlet.kt

Tue, 10 Aug 2021 18:36:46 +0200

author
Mike Becker <universe@uap-core.de>
date
Tue, 10 Aug 2021 18:36:46 +0200
changeset 221
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parent 208
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child 247
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permissions
-rw-r--r--

#102 add installation instructions

184
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1 /*
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2 * Copyright 2021 Mike Becker. All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * 1. Redistributions of source code must retain the above copyright
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8 * notice, this list of conditions and the following disclaimer.
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9 *
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10 * 2. Redistributions in binary form must reproduce the above copyright
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11 * notice, this list of conditions and the following disclaimer in the
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12 * documentation and/or other materials provided with the distribution.
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13 *
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14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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17 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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21 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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24 */
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25
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26 package de.uapcore.lightpit
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27
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28 import de.uapcore.lightpit.DataSourceProvider.Companion.SC_ATTR_NAME
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29 import de.uapcore.lightpit.dao.DataAccessObject
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30 import de.uapcore.lightpit.dao.createDataAccessObject
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31 import java.sql.SQLException
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32 import java.util.*
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33 import javax.servlet.http.HttpServlet
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34 import javax.servlet.http.HttpServletRequest
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35 import javax.servlet.http.HttpServletResponse
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36
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37 abstract class AbstractServlet : LoggingTrait, HttpServlet() {
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38
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39 /**
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40 * Contains the GET request mappings.
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41 */
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42 private val getMappings = mutableMapOf<PathPattern, MappingMethod>()
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43
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44 /**
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45 * Contains the POST request mappings.
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46 */
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47 private val postMappings = mutableMapOf<PathPattern, MappingMethod>()
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48
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49 protected fun get(pattern: String, method: MappingMethod) {
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50 getMappings[PathPattern(pattern)] = method
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51 }
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52
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53 protected fun post(pattern: String, method: MappingMethod) {
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54 postMappings[PathPattern(pattern)] = method
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55 }
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56
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57 private fun notFound(http: HttpRequest, dao: DataAccessObject) {
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58 http.response.sendError(HttpServletResponse.SC_NOT_FOUND)
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59 }
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60
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61 private fun findMapping(
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62 mappings: Map<PathPattern, MappingMethod>,
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63 req: HttpServletRequest
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64 ): Pair<PathPattern, MappingMethod> {
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65 val requestPath = sanitizedRequestPath(req)
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66 val candidates = mappings.filter { it.key.matches(requestPath) }
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67 return if (candidates.isEmpty()) {
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68 Pair(PathPattern(requestPath), ::notFound)
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69 } else {
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70 if (candidates.size > 1) {
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71 logger().warn("Ambiguous mapping for request path '{}'", requestPath)
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72 }
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73 candidates.entries.first().toPair()
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74 }
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75 }
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76
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77 private fun invokeMapping(
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78 mapping: Pair<PathPattern, MappingMethod>,
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79 req: HttpServletRequest,
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80 resp: HttpServletResponse,
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81 dao: DataAccessObject
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82 ) {
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83 val params = mapping.first.obtainPathParameters(sanitizedRequestPath(req))
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84 val method = mapping.second
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85 logger().trace("invoke {}", method)
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86 method(HttpRequest(req, resp, params), dao)
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87 }
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88
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89 private fun sanitizedRequestPath(req: HttpServletRequest) = req.pathInfo ?: "/"
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90
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91 private fun doProcess(
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92 req: HttpServletRequest,
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93 resp: HttpServletResponse,
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94 mappings: Map<PathPattern, MappingMethod>
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95 ) {
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96 val session = req.session
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97
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98 // the very first thing to do is to force UTF-8
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99 req.characterEncoding = "UTF-8"
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100
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101 // choose the requested language as session language (if available) or fall back to english, otherwise
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102 if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) {
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103 val availableLanguages = availableLanguages()
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104 val reqLocale = req.locale
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105 val sessionLocale = if (availableLanguages.contains(reqLocale)) reqLocale else availableLanguages.first()
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106 session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale)
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107 resp.locale = sessionLocale
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108 logger().debug(
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109 "Setting language for new session {}: {}", session.id, sessionLocale.displayLanguage
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110 )
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111 } else {
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112 val sessionLocale = session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) as Locale
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113 resp.locale = sessionLocale
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114 logger().trace("Continuing session {} with language {}", session.id, sessionLocale)
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115 }
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116
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117 // set some internal request attributes
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118 val http = HttpRequest(req, resp)
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119 val fullPath = req.servletPath + Optional.ofNullable(req.pathInfo).orElse("")
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120 req.setAttribute(Constants.REQ_ATTR_BASE_HREF, http.baseHref)
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121 req.setAttribute(Constants.REQ_ATTR_PATH, fullPath)
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122 req.getHeader("Referer")?.let {
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123 // TODO: add a sanity check to avoid link injection
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124 req.setAttribute(Constants.REQ_ATTR_REFERER, it)
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125 }
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126
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127 // if this is an error path, bypass the normal flow
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128 if (fullPath.startsWith("/error/")) {
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129 http.styleSheets = listOf("error")
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130 http.render("error")
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131 return
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132 }
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133
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134 // obtain a connection and create the data access objects
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135 val dsp = req.servletContext.getAttribute(SC_ATTR_NAME) as DataSourceProvider
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136 val dialect = dsp.dialect
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137 val ds = dsp.dataSource
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138 if (ds == null) {
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139 resp.sendError(
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140 HttpServletResponse.SC_SERVICE_UNAVAILABLE,
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141 "JNDI DataSource lookup failed. See log for details."
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142 )
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143 return
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144 }
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145 try {
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146 ds.connection.use { connection ->
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147 val dao = createDataAccessObject(dialect, connection)
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148 try {
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149 connection.autoCommit = false
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150 invokeMapping(findMapping(mappings, req), req, resp, dao)
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151 connection.commit()
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152 } catch (ex: SQLException) {
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153 logger().warn("Database transaction failed (Code {}): {}", ex.errorCode, ex.message)
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154 logger().debug("Details: ", ex)
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155 resp.sendError(
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156 HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
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157 "Unhandled Transaction Error - Code: " + ex.errorCode
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158 )
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159 connection.rollback()
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160 }
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161 }
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162 } catch (ex: SQLException) {
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163 logger().error("Severe Database Exception (Code {}): {}", ex.errorCode, ex.message)
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164 logger().debug("Details: ", ex)
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165 resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database Error - Code: " + ex.errorCode)
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166 }
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167 }
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168
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169 override fun doGet(req: HttpServletRequest, resp: HttpServletResponse) {
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170 doProcess(req, resp, getMappings)
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171 }
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172
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173 override fun doPost(req: HttpServletRequest, resp: HttpServletResponse) {
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174 doProcess(req, resp, postMappings)
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175 }
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176
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177 protected fun availableLanguages(): List<Locale> {
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178 val langTags = servletContext.getInitParameter(Constants.CTX_ATTR_LANGUAGES)?.split(",")?.map(String::trim) ?: emptyList()
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179 val locales = langTags.map(Locale::forLanguageTag).filter { it.language.isNotEmpty() }
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180 return locales.ifEmpty { listOf(Locale.ENGLISH) }
184
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181 }
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182
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183 }

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