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annotate src/org/eclipse/jetty/server/handler/IPAccessHandler.java @ 820:8e9db0bbf4f9

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remove org.eclipse.jetty.util.log and upgrade slf4j
author Franklin Schmidt <fschmidt@gmail.com>
date Tue, 13 Sep 2016 23:13:06 -0600
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.server.handler;
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20
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21 import java.io.IOException;
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22 import java.util.Collections;
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23 import java.util.List;
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24 import java.util.Map;
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25
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26 import javax.servlet.ServletException;
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27 import javax.servlet.http.HttpServletRequest;
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28 import javax.servlet.http.HttpServletResponse;
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29
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30 import org.eclipse.jetty.http.HttpStatus;
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31 import org.eclipse.jetty.http.PathMap;
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32 import org.eclipse.jetty.io.EndPoint;
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33 import org.eclipse.jetty.server.AbstractHttpConnection;
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34 import org.eclipse.jetty.server.Request;
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35 import org.eclipse.jetty.util.IPAddressMap;
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36 import org.slf4j.Logger;
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37 import org.slf4j.LoggerFactory;
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38
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39
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40 /**
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41 * IP Access Handler
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42 * <p>
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43 * Controls access to the wrapped handler by the real remote IP. Control is provided
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44 * by white/black lists that include both internet addresses and URIs. This handler
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45 * uses the real internet address of the connection, not one reported in the forwarded
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46 * for headers, as this cannot be as easily forged.
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47 * <p>
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48 * Typically, the black/white lists will be used in one of three modes:
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49 * <ul>
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50 * <li>Blocking a few specific IPs/URLs by specifying several black list entries.
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51 * <li>Allowing only some specific IPs/URLs by specifying several white lists entries.
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52 * <li>Allowing a general range of IPs/URLs by specifying several general white list
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53 * entries, that are then further refined by several specific black list exceptions
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54 * </ul>
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55 * <p>
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56 * An empty white list is treated as match all. If there is at least one entry in
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57 * the white list, then a request must match a white list entry. Black list entries
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58 * are always applied, so that even if an entry matches the white list, a black list
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59 * entry will override it.
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60 * <p>
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61 * Internet addresses may be specified as absolute address or as a combination of
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62 * four octet wildcard specifications (a.b.c.d) that are defined as follows.
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63 * </p>
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64 * <pre>
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65 * nnn - an absolute value (0-255)
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66 * mmm-nnn - an inclusive range of absolute values,
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67 * with following shorthand notations:
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68 * nnn- => nnn-255
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69 * -nnn => 0-nnn
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70 * - => 0-255
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71 * a,b,... - a list of wildcard specifications
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72 * </pre>
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73 * <p>
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74 * Internet address specification is separated from the URI pattern using the "|" (pipe)
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75 * character. URI patterns follow the servlet specification for simple * prefix and
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76 * suffix wild cards (e.g. /, /foo, /foo/bar, /foo/bar/*, *.baz).
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77 * <p>
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78 * Earlier versions of the handler used internet address prefix wildcard specification
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79 * to define a range of the internet addresses (e.g. 127., 10.10., 172.16.1.).
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80 * They also used the first "/" character of the URI pattern to separate it from the
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81 * internet address. Both of these features have been deprecated in the current version.
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82 * <p>
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83 * Examples of the entry specifications are:
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84 * <ul>
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85 * <li>10.10.1.2 - all requests from IP 10.10.1.2
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86 * <li>10.10.1.2|/foo/bar - all requests from IP 10.10.1.2 to URI /foo/bar
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87 * <li>10.10.1.2|/foo/* - all requests from IP 10.10.1.2 to URIs starting with /foo/
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88 * <li>10.10.1.2|*.html - all requests from IP 10.10.1.2 to URIs ending with .html
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89 * <li>10.10.0-255.0-255 - all requests from IPs within 10.10.0.0/16 subnet
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90 * <li>10.10.0-.-255|/foo/bar - all requests from IPs within 10.10.0.0/16 subnet to URI /foo/bar
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91 * <li>10.10.0-3,1,3,7,15|/foo/* - all requests from IPs addresses with last octet equal
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92 * to 1,3,7,15 in subnet 10.10.0.0/22 to URIs starting with /foo/
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93 * </ul>
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94 * <p>
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95 * Earlier versions of the handler used internet address prefix wildcard specification
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96 * to define a range of the internet addresses (e.g. 127., 10.10., 172.16.1.).
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97 * They also used the first "/" character of the URI pattern to separate it from the
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98 * internet address. Both of these features have been deprecated in the current version.
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99 */
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100 public class IPAccessHandler extends HandlerWrapper
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101 {
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102 private static final Logger LOG = LoggerFactory.getLogger(IPAccessHandler.class);
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103
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104 IPAddressMap<PathMap> _white = new IPAddressMap<PathMap>();
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105 IPAddressMap<PathMap> _black = new IPAddressMap<PathMap>();
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106
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107 /* ------------------------------------------------------------ */
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108 /**
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109 * Creates new handler object
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110 */
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111 public IPAccessHandler()
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112 {
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113 super();
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114 }
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115
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116 /* ------------------------------------------------------------ */
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117 /**
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118 * Creates new handler object and initializes white- and black-list
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119 *
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120 * @param white array of whitelist entries
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121 * @param black array of blacklist entries
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122 */
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123 public IPAccessHandler(String[] white, String []black)
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124 {
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125 super();
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126
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127 if (white != null && white.length > 0)
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128 setWhite(white);
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129 if (black != null && black.length > 0)
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130 setBlack(black);
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131 }
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132
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133 /* ------------------------------------------------------------ */
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134 /**
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135 * Add a whitelist entry to an existing handler configuration
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136 *
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137 * @param entry new whitelist entry
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138 */
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139 public void addWhite(String entry)
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140 {
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141 add(entry, _white);
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142 }
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143
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144 /* ------------------------------------------------------------ */
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145 /**
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146 * Add a blacklist entry to an existing handler configuration
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147 *
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148 * @param entry new blacklist entry
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149 */
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150 public void addBlack(String entry)
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151 {
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152 add(entry, _black);
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153 }
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154
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155 /* ------------------------------------------------------------ */
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156 /**
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157 * Re-initialize the whitelist of existing handler object
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158 *
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159 * @param entries array of whitelist entries
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160 */
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161 public void setWhite(String[] entries)
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162 {
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163 set(entries, _white);
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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 * Re-initialize the blacklist of existing handler object
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169 *
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170 * @param entries array of blacklist entries
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171 */
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172 public void setBlack(String[] entries)
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173 {
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174 set(entries, _black);
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175 }
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176
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177 /* ------------------------------------------------------------ */
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178 /**
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179 * Checks the incoming request against the whitelist and blacklist
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180 *
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181 * @see org.eclipse.jetty.server.handler.HandlerWrapper#handle(java.lang.String, org.eclipse.jetty.server.Request, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
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182 */
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183 @Override
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184 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
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185 {
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186 // Get the real remote IP (not the one set by the forwarded headers (which may be forged))
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187 AbstractHttpConnection connection = baseRequest.getConnection();
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188 if (connection!=null)
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189 {
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190 EndPoint endp=connection.getEndPoint();
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191 if (endp!=null)
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192 {
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193 String addr = endp.getRemoteAddr();
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194 if (addr!=null && !isAddrUriAllowed(addr,baseRequest.getPathInfo()))
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195 {
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196 response.sendError(HttpStatus.FORBIDDEN_403);
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197 baseRequest.setHandled(true);
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198 return;
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199 }
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200 }
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201 }
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202
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203 getHandler().handle(target,baseRequest, request, response);
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204 }
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205
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206
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207 /* ------------------------------------------------------------ */
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208 /**
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209 * Helper method to parse the new entry and add it to
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210 * the specified address pattern map.
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211 *
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212 * @param entry new entry
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213 * @param patternMap target address pattern map
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214 */
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215 protected void add(String entry, IPAddressMap<PathMap> patternMap)
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216 {
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217 if (entry != null && entry.length() > 0)
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218 {
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219 boolean deprecated = false;
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220 int idx;
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221 if (entry.indexOf('|') > 0 )
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222 {
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223 idx = entry.indexOf('|');
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224 }
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225 else
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226 {
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227 idx = entry.indexOf('/');
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228 deprecated = (idx >= 0);
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229 }
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230
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231 String addr = idx > 0 ? entry.substring(0,idx) : entry;
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232 String path = idx > 0 ? entry.substring(idx) : "/*";
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233
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234 if (addr.endsWith("."))
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235 deprecated = true;
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236 if (path!=null && (path.startsWith("|") || path.startsWith("/*.")))
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237 path=path.substring(1);
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238
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239 PathMap pathMap = patternMap.get(addr);
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240 if (pathMap == null)
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241 {
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242 pathMap = new PathMap(true);
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243 patternMap.put(addr,pathMap);
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244 }
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245 if (path != null && !"".equals(path))
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246 pathMap.put(path,path);
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247
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248 if (deprecated)
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249 LOG.debug(toString() +" - deprecated specification syntax: "+entry);
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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 * Helper method to process a list of new entries and replace
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256 * the content of the specified address pattern map
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257 *
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258 * @param entries new entries
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259 * @param patternMap target address pattern map
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260 */
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261 protected void set(String[] entries, IPAddressMap<PathMap> patternMap)
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262 {
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263 patternMap.clear();
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264
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265 if (entries != null && entries.length > 0)
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266 {
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267 for (String addrPath:entries)
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268 {
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269 add(addrPath, patternMap);
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270 }
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271 }
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272 }
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273
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274 /* ------------------------------------------------------------ */
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275 /**
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276 * Check if specified request is allowed by current IPAccess rules.
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277 *
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278 * @param addr internet address
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279 * @param path context path
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280 * @return true if request is allowed
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281 *
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282 */
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283 protected boolean isAddrUriAllowed(String addr, String path)
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284 {
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285 if (_white.size()>0)
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286 {
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287 boolean match = false;
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288
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289 Object whiteObj = _white.getLazyMatches(addr);
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290 if (whiteObj != null)
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291 {
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292 List whiteList = (whiteObj instanceof List) ? (List)whiteObj : Collections.singletonList(whiteObj);
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293
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294 for (Object entry: whiteList)
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295 {
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296 PathMap pathMap = ((Map.Entry<String,PathMap>)entry).getValue();
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297 if (match = (pathMap!=null && (pathMap.size()==0 || pathMap.match(path)!=null)))
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298 break;
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299 }
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300 }
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301
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302 if (!match)
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303 return false;
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304 }
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305
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306 if (_black.size() > 0)
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307 {
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308 Object blackObj = _black.getLazyMatches(addr);
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309 if (blackObj != null)
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310 {
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311 List blackList = (blackObj instanceof List) ? (List)blackObj : Collections.singletonList(blackObj);
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312
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313 for (Object entry: blackList)
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314 {
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315 PathMap pathMap = ((Map.Entry<String,PathMap>)entry).getValue();
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316 if (pathMap!=null && (pathMap.size()==0 || pathMap.match(path)!=null))
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317 return false;
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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 return true;
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323 }
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324
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325 /* ------------------------------------------------------------ */
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326 /**
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327 * Dump the white- and black-list configurations when started
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328 *
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329 * @see org.eclipse.jetty.server.handler.HandlerWrapper#doStart()
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330 */
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331 @Override
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332 protected void doStart()
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333 throws Exception
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334 {
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335 super.doStart();
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336
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337 if (LOG.isDebugEnabled())
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338 {
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339 System.err.println(dump());
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340 }
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341 }
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342
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343 /* ------------------------------------------------------------ */
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344 /**
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345 * Dump the handler configuration
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346 */
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347 public String dump()
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348 {
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349 StringBuilder buf = new StringBuilder();
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350
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351 buf.append(toString());
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352 buf.append(" WHITELIST:\n");
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353 dump(buf, _white);
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354 buf.append(toString());
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355 buf.append(" BLACKLIST:\n");
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356 dump(buf, _black);
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357
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358 return buf.toString();
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359 }
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360
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361 /* ------------------------------------------------------------ */
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362 /**
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363 * Dump a pattern map into a StringBuilder buffer
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364 *
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365 * @param buf buffer
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366 * @param patternMap pattern map to dump
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367 */
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368 protected void dump(StringBuilder buf, IPAddressMap<PathMap> patternMap)
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369 {
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370 for (String addr: patternMap.keySet())
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371 {
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372 for (Object path: ((PathMap)patternMap.get(addr)).values())
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373 {
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374 buf.append("# ");
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375 buf.append(addr);
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376 buf.append("|");
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377 buf.append(path);
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378 buf.append("\n");
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379 }
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380 }
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381 }
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382 }