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annotate Plugins/Samples/ServeFolders/Plugin.cpp @ 2168:84033563f7f0

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ServeFolders: Better protection against exceptions in the callbacks
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 22 Nov 2016 14:38:25 +0100
parents aa2915963531
children d15de5685ad8
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 **/
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21 #include "../Common/OrthancPluginCppWrapper.h"
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23 #include <json/reader.h>
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24 #include <json/value.h>
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25 #include <boost/filesystem.hpp>
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26 #include <boost/date_time/posix_time/posix_time.hpp>
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29 static OrthancPluginContext* context_ = NULL;
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30 static std::map<std::string, std::string> extensions_;
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31 static std::map<std::string, std::string> folders_;
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32 static const char* INDEX_URI = "/app/plugin-serve-folders.html";
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33 static bool allowCache_ = false;
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34 static bool generateETag_ = true;
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35
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36
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37 static void SetHttpHeaders(OrthancPluginRestOutput* output)
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38 {
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39 if (!allowCache_)
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40 {
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41 // http://stackoverflow.com/a/2068407/881731
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42 OrthancPluginSetHttpHeader(context_, output, "Cache-Control", "no-cache, no-store, must-revalidate");
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43 OrthancPluginSetHttpHeader(context_, output, "Pragma", "no-cache");
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44 OrthancPluginSetHttpHeader(context_, output, "Expires", "0");
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45 }
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46 }
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48
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49 static void RegisterDefaultExtensions()
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50 {
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51 extensions_["css"] = "text/css";
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52 extensions_["gif"] = "image/gif";
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53 extensions_["html"] = "text/html";
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54 extensions_["jpeg"] = "image/jpeg";
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55 extensions_["jpg"] = "image/jpeg";
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56 extensions_["js"] = "application/javascript";
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57 extensions_["json"] = "application/json";
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58 extensions_["nexe"] = "application/x-nacl";
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59 extensions_["nmf"] = "application/json";
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60 extensions_["pexe"] = "application/x-pnacl";
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61 extensions_["png"] = "image/png";
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62 extensions_["svg"] = "image/svg+xml";
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63 extensions_["woff"] = "application/x-font-woff";
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64 extensions_["xml"] = "application/xml";
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65 }
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66
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67
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68 static std::string GetMimeType(const std::string& path)
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69 {
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70 size_t dot = path.find_last_of('.');
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71
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72 std::string extension = (dot == std::string::npos) ? "" : path.substr(dot + 1);
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73 std::transform(extension.begin(), extension.end(), extension.begin(), tolower);
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74
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75 std::map<std::string, std::string>::const_iterator found = extensions_.find(extension);
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76
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77 if (found != extensions_.end() &&
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78 !found->second.empty())
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79 {
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80 return found->second;
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81 }
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82 else
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83 {
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84 OrthancPlugins::LogWarning(context_, "ServeFolders: Unknown MIME type for extension \"" + extension + "\"");
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85 return "application/octet-stream";
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86 }
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87 }
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89
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90 static bool LookupFolder(std::string& folder,
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91 OrthancPluginRestOutput* output,
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92 const OrthancPluginHttpRequest* request)
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93 {
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94 const std::string uri = request->groups[0];
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95
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96 std::map<std::string, std::string>::const_iterator found = folders_.find(uri);
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97 if (found == folders_.end())
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98 {
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99 OrthancPlugins::LogError(context_, "Unknown URI in plugin server-folders: " + uri);
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100 OrthancPluginSendHttpStatusCode(context_, output, 404);
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101 return false;
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102 }
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103 else
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104 {
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105 folder = found->second;
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106 return true;
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107 }
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108 }
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109
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110
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111 void ServeFolder(OrthancPluginRestOutput* output,
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112 const char* url,
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113 const OrthancPluginHttpRequest* request)
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114 {
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115 namespace fs = boost::filesystem;
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116
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117 if (request->method != OrthancPluginHttpMethod_Get)
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118 {
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119 OrthancPluginSendMethodNotAllowed(context_, output, "GET");
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120 return;
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121 }
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122
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123 std::string folder;
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124
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125 if (LookupFolder(folder, output, request))
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126 {
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127 const fs::path item(request->groups[1]);
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128 const fs::path parent((fs::path(folder) / item).parent_path());
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129
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130 if (item.filename().string() == "index.html" &&
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131 fs::is_directory(parent) &&
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132 !fs::is_regular_file(fs::path(folder) / item))
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133 {
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134 // On-the-fly generation of an "index.html"
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135 std::string s;
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136 s += "<html>\n";
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137 s += " <body>\n";
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138 s += " <ul>\n";
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139
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140 fs::directory_iterator end;
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141
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142 for (fs::directory_iterator it(parent) ; it != end; ++it)
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143 {
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144 if (fs::is_directory(it->status()))
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145 {
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146 std::string f = it->path().filename().string();
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147 s += " <li><a href=\"" + f + "/index.html\">" + f + "/</a></li>\n";
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148 }
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149 }
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150
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151 for (fs::directory_iterator it(parent) ; it != end; ++it)
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152 {
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153 fs::file_type type = it->status().type();
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154
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155 if (type == fs::regular_file ||
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156 type == fs::reparse_file) // cf. BitBucket issue #11
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157 {
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158 std::string f = it->path().filename().string();
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159 s += " <li><a href=\"" + f + "\">" + f + "</a></li>\n";
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160 }
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161 }
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162
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163 s += " </ul>\n";
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164 s += " </body>\n";
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165 s += "</html>\n";
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166
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167 SetHttpHeaders(output);
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168 OrthancPluginAnswerBuffer(context_, output, s.c_str(), s.size(), "text/html");
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169 }
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170 else
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171 {
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172 std::string path = folder + "/" + item.string();
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173 std::string mime = GetMimeType(path);
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174
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175 OrthancPlugins::MemoryBuffer content(context_);
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176
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177 try
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178 {
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179 content.ReadFile(path);
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180 }
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181 catch (OrthancPlugins::PluginException&)
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182 {
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183 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_InexistentFile);
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184 }
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185
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186 if (generateETag_)
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187 {
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188 OrthancPlugins::OrthancString md5(context_, OrthancPluginComputeMd5(context_, content.GetData(), content.GetSize()));
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189 std::string etag = "\"" + std::string(md5.GetContent()) + "\"";
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190 OrthancPluginSetHttpHeader(context_, output, "ETag", etag.c_str());
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191 }
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192
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193 boost::posix_time::ptime lastModification = boost::posix_time::from_time_t(fs::last_write_time(path));
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194 std::string t = boost::posix_time::to_iso_string(lastModification);
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195 OrthancPluginSetHttpHeader(context_, output, "Last-Modified", t.c_str());
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196
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197 SetHttpHeaders(output);
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198 OrthancPluginAnswerBuffer(context_, output, content.GetData(), content.GetSize(), mime.c_str());
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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
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204 void ListServedFolders(OrthancPluginRestOutput* output,
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205 const char* url,
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206 const OrthancPluginHttpRequest* request)
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207 {
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208 if (request->method != OrthancPluginHttpMethod_Get)
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209 {
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210 OrthancPluginSendMethodNotAllowed(context_, output, "GET");
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211 return;
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212 }
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213
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214 std::string s = "<html><body><h1>Additional folders served by Orthanc</h1>\n";
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215
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216 if (folders_.empty())
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217 {
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218 s += "<p>Empty section <tt>ServeFolders</tt> in your configuration file: No additional folder is served.</p>\n";
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219 }
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220 else
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221 {
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222 s += "<ul>\n";
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223 for (std::map<std::string, std::string>::const_iterator
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224 it = folders_.begin(); it != folders_.end(); ++it)
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225 {
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226 // The URI is relative to INDEX_URI ("/app/plugin-serve-folders.html")
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227 s += "<li><a href=\"../" + it->first + "/index.html\">" + it->first + "</li>\n";
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228 }
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229
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230 s += "</ul>\n";
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231 }
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232
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233 s += "</body></html>\n";
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234
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235 SetHttpHeaders(output);
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236 OrthancPluginAnswerBuffer(context_, output, s.c_str(), s.size(), "text/html");
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237 }
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238
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239
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240 static void ConfigureFolders(const Json::Value& folders)
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241 {
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242 if (folders.type() != Json::objectValue)
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243 {
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244 OrthancPlugins::LogError(context_, "The list of folders to be served is badly formatted (must be a JSON object)");
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245 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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246 }
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247
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248 Json::Value::Members members = folders.getMemberNames();
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249
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250 // Register the callback for each base URI
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251 for (Json::Value::Members::const_iterator
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252 it = members.begin(); it != members.end(); ++it)
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253 {
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254 if (folders[*it].type() != Json::stringValue)
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255 {
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256 OrthancPlugins::LogError(context_, "The folder to be server \"" + *it +
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257 "\" must be associated with a string value (its mapped URI)");
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258 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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259 }
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260
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261 std::string baseUri = *it;
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262
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263 // Remove the heading and trailing slashes in the root URI, if any
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264 while (!baseUri.empty() &&
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265 *baseUri.begin() == '/')
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266 {
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267 baseUri = baseUri.substr(1);
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268 }
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269
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270 while (!baseUri.empty() &&
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271 *baseUri.rbegin() == '/')
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272 {
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273 baseUri.resize(baseUri.size() - 1);
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274 }
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275
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276 if (baseUri.empty())
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277 {
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278 OrthancPlugins::LogError(context_, "The URI of a folder to be served cannot be empty");
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279 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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280 }
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281
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282 // Check whether the source folder exists and is indeed a directory
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283 const std::string folder = folders[*it].asString();
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284 if (!boost::filesystem::is_directory(folder))
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285 {
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286 OrthancPlugins::LogError(context_, "Trying and serve an inexistent folder: " + folder);
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287 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_InexistentFile);
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288 }
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289
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290 folders_[baseUri] = folder;
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291
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292 // Register the callback to serve the folder
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293 {
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294 const std::string regex = "/(" + baseUri + ")/(.*)";
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295 OrthancPlugins::RegisterRestCallback<ServeFolder>(context_, regex.c_str(), true);
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296 }
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297 }
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298 }
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299
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300
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301 static void ReadConfiguration()
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302 {
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303 OrthancPlugins::OrthancConfiguration configuration;
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304
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305 {
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306 OrthancPlugins::OrthancConfiguration globalConfiguration(context_);
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307 globalConfiguration.GetSection(configuration, "ServeFolders");
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308 }
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309
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310 if (!configuration.IsSection("Folders"))
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311 {
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312 // This is a basic configuration
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313 ConfigureFolders(configuration.GetJson());
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314 }
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315 else
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316 {
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317 // This is an advanced configuration
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318 ConfigureFolders(configuration.GetJson()["Folders"]);
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319
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320 bool tmp;
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321
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322 if (configuration.LookupBooleanValue(tmp, "AllowCache"))
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323 {
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324 allowCache_ = tmp;
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325 OrthancPlugins::LogWarning(context_, "ServeFolders: Requesting the HTTP client to " +
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326 std::string(tmp ? "enable" : "disable") +
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327 " its caching mechanism");
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328 }
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329
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330 if (configuration.LookupBooleanValue(tmp, "GenerateETag"))
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331 {
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332 generateETag_ = tmp;
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333 OrthancPlugins::LogWarning(context_, "ServeFolders: The computation of an ETag for the served resources is " +
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334 std::string(tmp ? "enabled" : "disabled"));
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335 }
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336 }
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337
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338 if (folders_.empty())
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339 {
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340 OrthancPlugins::LogWarning(context_, "ServeFolders: Empty configuration file: No additional folder will be served!");
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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 extern "C"
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346 {
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347 ORTHANC_PLUGINS_API int32_t OrthancPluginInitialize(OrthancPluginContext* context)
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348 {
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349 context_ = context;
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350
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351 /* Check the version of the Orthanc core */
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352 if (OrthancPluginCheckVersion(context_) == 0)
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353 {
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354 char info[1024];
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355 sprintf(info, "Your version of Orthanc (%s) must be above %d.%d.%d to run this plugin",
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356 context_->orthancVersion,
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357 ORTHANC_PLUGINS_MINIMAL_MAJOR_NUMBER,
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358 ORTHANC_PLUGINS_MINIMAL_MINOR_NUMBER,
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359 ORTHANC_PLUGINS_MINIMAL_REVISION_NUMBER);
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360 OrthancPluginLogError(context_, info);
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361 return -1;
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362 }
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363
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364 RegisterDefaultExtensions();
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365 OrthancPluginSetDescription(context_, "Serve additional folders with the HTTP server of Orthanc.");
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366 OrthancPluginSetRootUri(context, INDEX_URI);
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367 OrthancPlugins::RegisterRestCallback<ListServedFolders>(context_, INDEX_URI, true);
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368
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369 try
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370 {
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371 ReadConfiguration();
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372 }
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373 catch (OrthancPlugins::PluginException& e)
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374 {
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375 OrthancPlugins::LogError(context, "Error while initializing the ServeFolders plugin: " +
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376 std::string(e.GetErrorDescription(context)));
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377 return -1;
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378 }
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379
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380 return 0;
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381 }
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382
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383
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384 ORTHANC_PLUGINS_API void OrthancPluginFinalize()
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385 {
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386 }
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387
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388
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389 ORTHANC_PLUGINS_API const char* OrthancPluginGetName()
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390 {
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391 return "serve-folders";
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392 }
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Sebastien Jodogne <s.jodogne@gmail.com>
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393
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394
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395 ORTHANC_PLUGINS_API const char* OrthancPluginGetVersion()
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396 {
1391
b3119c32c920 version in ServerFolders plugin
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397 return SERVE_FOLDERS_VERSION;
1322
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398 }
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399 }