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

Mon, 09 Aug 2021 16:57:56 +0200

author
Mike Becker <universe@uap-core.de>
date
Mon, 09 Aug 2021 16:57:56 +0200
changeset 217
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parent 210
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child 225
87328572e36f
permissions
-rw-r--r--

#104 changes base layout from fixed to grid

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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.dao.DataAccessObject
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29 import de.uapcore.lightpit.viewmodel.NavMenu
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30 import de.uapcore.lightpit.viewmodel.View
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31 import java.util.*
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32 import javax.servlet.http.HttpServletRequest
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33 import javax.servlet.http.HttpServletResponse
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34 import javax.servlet.http.HttpSession
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35 import kotlin.math.min
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36
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37 typealias MappingMethod = (HttpRequest, DataAccessObject) -> Unit
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38 typealias PathParameters = Map<String, String>
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39
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40 sealed interface ValidationResult<T>
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41 class ValidationError<T>(val message: String): ValidationResult<T>
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42 class ValidatedValue<T>(val result: T): ValidationResult<T>
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43
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44 class HttpRequest(
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45 val request: HttpServletRequest,
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46 val response: HttpServletResponse,
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47 val pathParams: PathParameters = emptyMap()
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48 ) {
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49 val session: HttpSession = request.session
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50
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51 val remoteUser: String? = request.remoteUser
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52
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53 /**
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54 * The name of the content page.
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55 *
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56 * @see Constants#REQ_ATTR_CONTENT_PAGE
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57 */
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58 var contentPage = ""
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59 set(value) {
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60 field = value
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61 request.setAttribute(Constants.REQ_ATTR_CONTENT_PAGE, jspPath(value))
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62 }
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63
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64 /**
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65 * The name of the content page.
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66 *
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67 * @see Constants#REQ_ATTR_PAGE_TITLE
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68 */
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69 var pageTitle = ""
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70 set(value) {
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71 field = value
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72 request.setAttribute(Constants.REQ_ATTR_PAGE_TITLE, value)
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73 }
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74
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75 /**
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76 * A list of additional style sheets.
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77 *
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78 * @see Constants#REQ_ATTR_STYLESHEET
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79 */
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80 var styleSheets = emptyList<String>()
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81 set(value) {
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82 field = value
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83 request.setAttribute(Constants.REQ_ATTR_STYLESHEET,
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84 value.map { it.withExt(".css") }
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85 )
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86 }
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87
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88 /**
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89 * A list of additional style sheets.
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90 *
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91 * @see Constants#REQ_ATTR_JAVASCRIPT
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92 */
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93 var javascript = ""
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94 set(value) {
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95 field = value
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96 request.setAttribute(Constants.REQ_ATTR_JAVASCRIPT,
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97 value.withExt(".js")
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98 )
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99 }
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100
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101 /**
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102 * The name of the navigation menu JSP.
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103 *
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104 * @see Constants#REQ_ATTR_NAVIGATION
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105 */
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106 var navigationMenu: NavMenu? = null
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107 set(value) {
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108 field = value
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109 request.setAttribute(Constants.REQ_ATTR_NAVIGATION, navigationMenu)
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110 }
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111
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112 var redirectLocation: String? = null
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113 set(value) {
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114 field = value
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115 if (value == null) {
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116 request.removeAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION)
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117 } else {
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118 request.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, baseHref + value)
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119 }
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120 }
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121
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122 var feedPath: String? = null
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123 set(value) {
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124 field = value
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125 if (value == null) {
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126 request.removeAttribute(Constants.REQ_ATTR_FEED_HREF)
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127 } else {
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128 request.setAttribute(Constants.REQ_ATTR_FEED_HREF, baseHref + value)
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129 }
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130 }
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131
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132 /**
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133 * The view object.
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134 *
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135 * @see Constants#REQ_ATTR_VIEWMODEL
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136 */
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137 var view: View? = null
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138 set(value) {
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139 field = value
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140 request.setAttribute(Constants.REQ_ATTR_VIEWMODEL, value)
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141 }
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142
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143 /**
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144 * Additional port info, if necessary.
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145 */
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146 private val portInfo =
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147 if ((request.scheme == "http" && request.serverPort == 80)
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148 || (request.scheme == "https" && request.serverPort == 443)
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149 ) "" else ":${request.serverPort}"
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150
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151 /**
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152 * The base path of this application.
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153 */
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154 val baseHref get() = "${request.scheme}://${request.serverName}$portInfo${request.contextPath}/"
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155
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156 private fun String.withExt(ext: String) = if (endsWith(ext)) this else plus(ext)
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157 private fun jspPath(name: String) = Constants.JSP_PATH_PREFIX.plus(name).withExt(".jsp")
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158
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159 fun param(name: String): String? = request.getParameter(name)
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160 fun paramArray(name: String): Array<String> = request.getParameterValues(name) ?: emptyArray()
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161
210
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162 fun <T> param(name: String, validator: (String?) -> (ValidationResult<T>),
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163 defaultValue: T, errorMessages: MutableList<String>): T {
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164 return when (val result = validator(param(name))) {
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165 is ValidationError -> {
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166 errorMessages.add(i18n(result.message))
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167 defaultValue
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168 }
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169 is ValidatedValue -> {
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170 result.result
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171 }
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172 }
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173 }
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174
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175 private fun forward(jsp: String) {
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176 request.getRequestDispatcher(jspPath(jsp)).forward(request, response)
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177 }
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178
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179 fun renderFeed(page: String? = null) {
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180 page?.let { contentPage = it }
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181 forward("feed")
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182 }
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183
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184 fun render(page: String? = null) {
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185 page?.let { contentPage = it }
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186 forward("site")
184
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187 }
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188
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189 fun renderCommit(location: String? = null) {
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190 location?.let { redirectLocation = it }
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191 contentPage = Constants.JSP_COMMIT_SUCCESSFUL
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192 render()
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193 }
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194
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195 fun i18n(key: String) = ResourceBundle.getBundle("localization/strings", response.locale).getString(key)
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196 }
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197
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198 /**
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199 * A path pattern optionally containing placeholders.
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200 *
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201 * The special directories . and .. are disallowed in the pattern.
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202 * Placeholders start with a % sign.
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203 *
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204 * @param pattern the pattern
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205 */
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206 class PathPattern(pattern: String) {
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207 private val nodePatterns: List<String>
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208 private val collection: Boolean
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209
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210 private fun parse(pattern: String): List<String> {
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211 val nodes = pattern.split("/").filter { it.isNotBlank() }.toList()
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212 require(nodes.none { it == "." || it == ".." }) { "Path must not contain '.' or '..' nodes." }
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213 return nodes
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214 }
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215
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216 /**
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217 * Matches a path against this pattern.
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218 * The path must be canonical in the sense that no . or .. parts occur.
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219 *
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220 * @param path the path to match
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221 * @return true if the path matches the pattern, false otherwise
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222 */
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223 fun matches(path: String): Boolean {
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224 if (collection xor path.endsWith("/")) return false
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225 val nodes = parse(path)
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226 if (nodePatterns.size != nodes.size) return false
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227 for (i in nodePatterns.indices) {
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228 val pattern = nodePatterns[i]
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229 val node = nodes[i]
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230 if (pattern.startsWith("%")) continue
179
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231 if (pattern != node) return false
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232 }
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233 return true
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234 }
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235
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236 /**
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237 * Returns the path parameters found in the specified path using this pattern.
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238 * The return value of this method is undefined, if the patter does not match.
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239 *
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240 * @param path the path
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241 * @return the path parameters, if any, or an empty map
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242 * @see .matches
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243 */
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244 fun obtainPathParameters(path: String): PathParameters {
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245 val params = mutableMapOf<String, String>()
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246 val nodes = parse(path)
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247 for (i in 0 until min(nodes.size, nodePatterns.size)) {
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248 val pattern = nodePatterns[i]
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249 val node = nodes[i]
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250 if (pattern.startsWith("%")) {
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251 params[pattern.substring(1)] = node
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252 }
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253 }
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254 return params
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255 }
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256
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257 override fun hashCode(): Int {
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258 val str = StringBuilder()
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259 for (node in nodePatterns) {
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260 if (node.startsWith("%")) {
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261 str.append("/%")
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262 } else {
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263 str.append('/')
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264 str.append(node)
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265 }
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266 }
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267 if (collection) str.append('/')
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268 return str.toString().hashCode()
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269 }
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270
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271 override fun equals(other: Any?): Boolean {
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272 if (other is PathPattern) {
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273 if (collection xor other.collection || nodePatterns.size != other.nodePatterns.size) return false
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274 for (i in nodePatterns.indices) {
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275 val left = nodePatterns[i]
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276 val right = other.nodePatterns[i]
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277 if (left.startsWith("%") && right.startsWith("%")) continue
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278 if (left != right) return false
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279 }
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280 return true
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281 } else {
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282 return false
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283 }
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284 }
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285
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286 init {
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287 nodePatterns = parse(pattern)
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288 collection = pattern.endsWith("/")
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289 }
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290 }
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291

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