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7 | 'use strict'
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8 |
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9 |
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10 |
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11 |
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12 |
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13 |
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14 | var debug = require('debug')('finalhandler')
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15 | var encodeUrl = require('encodeurl')
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16 | var escapeHtml = require('escape-html')
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17 | var onFinished = require('on-finished')
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18 | var parseUrl = require('parseurl')
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19 | var statuses = require('statuses')
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20 | var unpipe = require('unpipe')
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21 |
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22 |
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23 |
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24 |
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25 |
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26 |
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27 | var DOUBLE_SPACE_REGEXP = /\x20{2}/g
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28 | var NEWLINE_REGEXP = /\n/g
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29 |
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30 |
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31 | var defer = typeof setImmediate === 'function'
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32 | ? setImmediate
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33 | : function (fn) { process.nextTick(fn.bind.apply(fn, arguments)) }
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34 | var isFinished = onFinished.isFinished
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35 |
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36 |
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37 |
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38 |
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39 |
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40 |
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41 |
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42 |
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43 | function createHtmlDocument (message) {
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44 | var body = escapeHtml(message)
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45 | .replace(NEWLINE_REGEXP, '<br>')
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46 | .replace(DOUBLE_SPACE_REGEXP, ' ')
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47 |
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48 | return '<!DOCTYPE html>\n' +
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49 | '<html lang="en">\n' +
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50 | '<head>\n' +
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51 | '<meta charset="utf-8">\n' +
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52 | '<title>Error</title>\n' +
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53 | '</head>\n' +
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54 | '<body>\n' +
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55 | '<pre>' + body + '</pre>\n' +
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56 | '</body>\n' +
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57 | '</html>\n'
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58 | }
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59 |
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60 |
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61 |
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62 |
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63 |
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64 |
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65 | module.exports = finalhandler
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66 |
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67 |
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68 |
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69 |
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70 |
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71 |
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72 |
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73 |
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74 |
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75 |
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76 |
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77 | function finalhandler (req, res, options) {
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78 | var opts = options || {}
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79 |
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80 |
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81 | var env = opts.env || process.env.NODE_ENV || 'development'
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82 |
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83 |
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84 | var onerror = opts.onerror
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85 |
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86 | return function (err) {
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87 | var headers
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88 | var msg
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89 | var status
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90 |
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91 |
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92 | if (!err && headersSent(res)) {
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93 | debug('cannot 404 after headers sent')
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94 | return
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95 | }
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96 |
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97 |
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98 | if (err) {
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99 |
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100 | status = getErrorStatusCode(err)
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101 |
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102 | if (status === undefined) {
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103 |
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104 | status = getResponseStatusCode(res)
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105 | } else {
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106 |
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107 | headers = getErrorHeaders(err)
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108 | }
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109 |
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110 |
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111 | msg = getErrorMessage(err, status, env)
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112 | } else {
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113 |
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114 | status = 404
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115 | msg = 'Cannot ' + req.method + ' ' + encodeUrl(getResourceName(req))
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116 | }
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117 |
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118 | debug('default %s', status)
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119 |
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120 |
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121 | if (err && onerror) {
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122 | defer(onerror, err, req, res)
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123 | }
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124 |
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125 |
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126 | if (headersSent(res)) {
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127 | debug('cannot %d after headers sent', status)
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128 | req.socket.destroy()
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129 | return
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130 | }
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131 |
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132 |
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133 | send(req, res, status, headers, msg)
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134 | }
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135 | }
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136 |
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137 |
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138 |
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139 |
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140 |
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141 |
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142 |
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143 |
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144 |
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145 | function getErrorHeaders (err) {
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146 | if (!err.headers || typeof err.headers !== 'object') {
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147 | return undefined
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148 | }
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149 |
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150 | var headers = Object.create(null)
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151 | var keys = Object.keys(err.headers)
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152 |
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153 | for (var i = 0; i < keys.length; i++) {
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154 | var key = keys[i]
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155 | headers[key] = err.headers[key]
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156 | }
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157 |
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158 | return headers
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159 | }
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160 |
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161 |
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162 |
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163 |
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164 |
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165 |
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166 |
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167 |
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168 |
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169 |
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170 |
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171 | function getErrorMessage (err, status, env) {
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172 | var msg
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173 |
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174 | if (env !== 'production') {
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175 |
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176 | msg = err.stack
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177 |
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178 |
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179 | if (!msg && typeof err.toString === 'function') {
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180 | msg = err.toString()
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181 | }
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182 | }
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183 |
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184 | return msg || statuses.message[status]
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185 | }
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186 |
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187 |
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188 |
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189 |
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190 |
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191 |
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192 |
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193 |
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194 |
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195 | function getErrorStatusCode (err) {
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196 |
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197 | if (typeof err.status === 'number' && err.status >= 400 && err.status < 600) {
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198 | return err.status
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199 | }
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200 |
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201 |
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202 | if (typeof err.statusCode === 'number' && err.statusCode >= 400 && err.statusCode < 600) {
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203 | return err.statusCode
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204 | }
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205 |
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206 | return undefined
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207 | }
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208 |
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209 |
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210 |
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211 |
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212 |
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213 |
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214 |
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215 |
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216 |
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217 |
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218 |
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219 |
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220 | function getResourceName (req) {
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221 | try {
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222 | return parseUrl.original(req).pathname
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223 | } catch (e) {
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224 | return 'resource'
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225 | }
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226 | }
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227 |
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228 |
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229 |
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230 |
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231 |
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232 |
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233 |
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234 |
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235 |
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236 | function getResponseStatusCode (res) {
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237 | var status = res.statusCode
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238 |
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239 |
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240 | if (typeof status !== 'number' || status < 400 || status > 599) {
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241 | status = 500
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242 | }
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243 |
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244 | return status
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245 | }
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246 |
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247 |
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248 |
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249 |
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250 |
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251 |
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252 |
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253 |
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254 |
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255 | function headersSent (res) {
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256 | return typeof res.headersSent !== 'boolean'
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257 | ? Boolean(res._header)
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258 | : res.headersSent
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259 | }
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260 |
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261 |
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262 |
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263 |
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264 |
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265 |
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266 |
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267 |
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268 |
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269 |
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270 |
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271 |
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272 | function send (req, res, status, headers, message) {
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273 | function write () {
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274 |
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275 | var body = createHtmlDocument(message)
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276 |
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277 |
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278 | res.statusCode = status
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279 | res.statusMessage = statuses.message[status]
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280 |
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281 |
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282 | res.removeHeader('Content-Encoding')
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283 | res.removeHeader('Content-Language')
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284 | res.removeHeader('Content-Range')
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285 |
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286 |
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287 | setHeaders(res, headers)
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288 |
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289 |
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290 | res.setHeader('Content-Security-Policy', "default-src 'none'")
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291 | res.setHeader('X-Content-Type-Options', 'nosniff')
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292 |
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293 |
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294 | res.setHeader('Content-Type', 'text/html; charset=utf-8')
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295 | res.setHeader('Content-Length', Buffer.byteLength(body, 'utf8'))
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296 |
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297 | if (req.method === 'HEAD') {
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298 | res.end()
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299 | return
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300 | }
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301 |
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302 | res.end(body, 'utf8')
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303 | }
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304 |
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305 | if (isFinished(req)) {
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306 | write()
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307 | return
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308 | }
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309 |
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310 |
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311 | unpipe(req)
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312 |
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313 |
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314 | onFinished(req, write)
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315 | req.resume()
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316 | }
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317 |
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318 |
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319 |
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320 |
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321 |
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322 |
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323 |
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324 |
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325 |
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326 | function setHeaders (res, headers) {
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327 | if (!headers) {
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328 | return
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329 | }
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330 |
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331 | var keys = Object.keys(headers)
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332 | for (var i = 0; i < keys.length; i++) {
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333 | var key = keys[i]
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334 | res.setHeader(key, headers[key])
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335 | }
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336 | }
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