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annotate OrthancServer/Plugins/Samples/ServeFolders/Plugin.cpp @ 5853:4d932683049d get-scu tip

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very first implementation of C-Get SCU
author Alain Mazy <am@orthanc.team>
date Tue, 29 Oct 2024 17:25:49 +0100
parents f7adfb22e20e
children
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
1900
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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 * Copyright (C) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU General Public License as
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11 * published by the Free Software Foundation, either version 3 of the
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12 * License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU General Public License
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20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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21 **/
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24 #define SERVE_FOLDERS_NAME "serve-folders"
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26 #include "../Common/OrthancPluginCppWrapper.h"
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28 #include <json/value.h>
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29 #include <boost/filesystem.hpp>
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30 #include <boost/date_time/posix_time/posix_time.hpp>
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33 #if HAS_ORTHANC_EXCEPTION == 1
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34 # error The macro HAS_ORTHANC_EXCEPTION must be set to 0 to compile this plugin
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35 #endif
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36
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38
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39 static std::map<std::string, std::string> extensions_;
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40 static std::map<std::string, std::string> folders_;
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41 static const char* INDEX_URI = "/app/plugin-serve-folders.html";
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42 static bool allowCache_ = false;
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43 static bool generateETag_ = true;
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44
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45
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46 static void SetHttpHeaders(OrthancPluginRestOutput* output)
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47 {
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48 if (!allowCache_)
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49 {
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50 // http://stackoverflow.com/a/2068407/881731
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51 OrthancPluginContext* context = OrthancPlugins::GetGlobalContext();
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52 OrthancPluginSetHttpHeader(context, output, "Cache-Control", "no-cache, no-store, must-revalidate");
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53 OrthancPluginSetHttpHeader(context, output, "Pragma", "no-cache");
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54 OrthancPluginSetHttpHeader(context, output, "Expires", "0");
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55 }
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56 }
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58
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59 static void RegisterDefaultExtensions()
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60 {
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61 extensions_["css"] = "text/css";
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62 extensions_["gif"] = "image/gif";
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63 extensions_["html"] = "text/html";
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64 extensions_["jpeg"] = "image/jpeg";
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65 extensions_["jpg"] = "image/jpeg";
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66 extensions_["js"] = "application/javascript";
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67 extensions_["json"] = "application/json";
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68 extensions_["map"] = "application/octet-stream"; // https://stackoverflow.com/a/19912684/881731
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69 extensions_["nexe"] = "application/x-nacl";
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70 extensions_["nmf"] = "application/json";
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71 extensions_["pdf"] = "application/pdf";
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72 extensions_["pexe"] = "application/x-pnacl";
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73 extensions_["png"] = "image/png";
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74 extensions_["svg"] = "image/svg+xml";
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75 extensions_["wasm"] = "application/wasm";
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76 extensions_["woff"] = "application/x-font-woff";
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77 extensions_["woff2"] = "font/woff2";
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78 extensions_["xml"] = "application/xml";
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79 }
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80
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81
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82 static std::string GetMimeType(const std::string& path)
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83 {
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84 size_t dot = path.find_last_of('.');
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85
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86 std::string extension = (dot == std::string::npos) ? "" : path.substr(dot + 1);
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87 std::transform(extension.begin(), extension.end(), extension.begin(), tolower);
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88
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89 std::map<std::string, std::string>::const_iterator found = extensions_.find(extension);
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90
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91 if (found != extensions_.end() &&
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92 !found->second.empty())
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93 {
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94 return found->second;
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95 }
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96 else
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97 {
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98 ORTHANC_PLUGINS_LOG_WARNING("ServeFolders: Unknown MIME type for extension \"" + extension + "\"");
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99 return "application/octet-stream";
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100 }
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101 }
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102
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103
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104 static bool LookupFolder(std::string& folder,
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105 OrthancPluginRestOutput* output,
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106 const OrthancPluginHttpRequest* request)
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107 {
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108 const std::string uri = request->groups[0];
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109
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110 std::map<std::string, std::string>::const_iterator found = folders_.find(uri);
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111 if (found == folders_.end())
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112 {
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113 ORTHANC_PLUGINS_LOG_ERROR("Unknown URI in plugin server-folders: " + uri);
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114 OrthancPluginSendHttpStatusCode(OrthancPlugins::GetGlobalContext(), output, 404);
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115 return false;
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116 }
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117 else
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118 {
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119 folder = found->second;
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120 return true;
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121 }
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122 }
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123
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124
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125 static void Answer(OrthancPluginRestOutput* output,
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126 const char* content,
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127 size_t size,
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128 const std::string& mime)
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129 {
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130 if (generateETag_)
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131 {
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132 OrthancPlugins::OrthancString md5;
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133 md5.Assign(OrthancPluginComputeMd5(OrthancPlugins::GetGlobalContext(), content, size));
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134
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135 std::string etag = "\"" + std::string(md5.GetContent()) + "\"";
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136 OrthancPluginSetHttpHeader(OrthancPlugins::GetGlobalContext(), output, "ETag", etag.c_str());
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137 }
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138
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139 SetHttpHeaders(output);
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140 OrthancPluginAnswerBuffer(OrthancPlugins::GetGlobalContext(), output, content, size, mime.c_str());
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141 }
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142
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143
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144 void ServeFolder(OrthancPluginRestOutput* output,
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145 const char* url,
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146 const OrthancPluginHttpRequest* request)
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147 {
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148 namespace fs = boost::filesystem;
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149
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150 if (request->method != OrthancPluginHttpMethod_Get)
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151 {
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152 OrthancPluginSendMethodNotAllowed(OrthancPlugins::GetGlobalContext(), output, "GET");
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153 return;
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154 }
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155
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156 std::string folder;
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157
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158 if (LookupFolder(folder, output, request))
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159 {
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160 const fs::path item(request->groups[1]);
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161 const fs::path parent((fs::path(folder) / item).parent_path());
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162
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163 if (item.filename().string() == "index.html" &&
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164 fs::is_directory(parent) &&
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165 !fs::is_regular_file(fs::path(folder) / item))
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166 {
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167 // On-the-fly generation of an "index.html"
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168 std::string s;
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169 s += "<html>\n";
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170 s += " <body>\n";
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171 s += " <ul>\n";
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172
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173 fs::directory_iterator end;
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174
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175 for (fs::directory_iterator it(parent) ; it != end; ++it)
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176 {
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177 if (fs::is_directory(it->status()))
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178 {
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179 std::string f = it->path().filename().string();
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180 s += " <li><a href=\"" + f + "/index.html\">" + f + "/</a></li>\n";
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181 }
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182 }
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183
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184 for (fs::directory_iterator it(parent) ; it != end; ++it)
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185 {
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186 fs::file_type type = it->status().type();
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187
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188 if (type == fs::regular_file ||
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189 type == fs::reparse_file) // cf. BitBucket issue #11
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190 {
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191 std::string f = it->path().filename().string();
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192 s += " <li><a href=\"" + f + "\">" + f + "</a></li>\n";
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193 }
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194 }
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195
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196 s += " </ul>\n";
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197 s += " </body>\n";
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198 s += "</html>\n";
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199
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200 Answer(output, s.c_str(), s.size(), "text/html");
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201 }
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202 else
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203 {
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204 std::string path = folder + "/" + item.string();
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205 std::string mime = GetMimeType(path);
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206
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207 OrthancPlugins::MemoryBuffer content;
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208
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209 try
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210 {
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211 content.ReadFile(path);
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212 }
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213 catch (...)
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214 {
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215 ORTHANC_PLUGINS_THROW_EXCEPTION(InexistentFile);
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216 }
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217
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218 boost::posix_time::ptime lastModification =
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219 boost::posix_time::from_time_t(fs::last_write_time(path));
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220 std::string t = boost::posix_time::to_iso_string(lastModification);
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221 OrthancPluginSetHttpHeader(OrthancPlugins::GetGlobalContext(),
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222 output, "Last-Modified", t.c_str());
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223
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224 Answer(output, content.GetData(), content.GetSize(), mime);
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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 void ListServedFolders(OrthancPluginRestOutput* output,
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231 const char* url,
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232 const OrthancPluginHttpRequest* request)
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233 {
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234 if (request->method != OrthancPluginHttpMethod_Get)
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235 {
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236 OrthancPluginSendMethodNotAllowed(OrthancPlugins::GetGlobalContext(), output, "GET");
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237 return;
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238 }
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239
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240 std::string s = "<html><body><h1>Additional folders served by Orthanc</h1>\n";
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241
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242 if (folders_.empty())
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243 {
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244 s += "<p>Empty section <tt>ServeFolders</tt> in your configuration file: No additional folder is served.</p>\n";
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245 }
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246 else
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247 {
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248 s += "<ul>\n";
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249 for (std::map<std::string, std::string>::const_iterator
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250 it = folders_.begin(); it != folders_.end(); ++it)
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251 {
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252 // The URI is relative to INDEX_URI ("/app/plugin-serve-folders.html")
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253 s += "<li><a href=\"../" + it->first + "/index.html\">" + it->first + "</li>\n";
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254 }
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255
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256 s += "</ul>\n";
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257 }
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258
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259 s += "</body></html>\n";
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260
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261 Answer(output, s.c_str(), s.size(), "text/html");
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262 }
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263
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264
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265 static void ConfigureFolders(const Json::Value& folders)
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266 {
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267 if (folders.type() != Json::objectValue)
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268 {
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269 ORTHANC_PLUGINS_LOG_ERROR("The list of folders to be served is badly formatted (must be a JSON object)");
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270 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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271 }
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272
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273 Json::Value::Members members = folders.getMemberNames();
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274
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275 // Register the callback for each base URI
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276 for (Json::Value::Members::const_iterator
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277 it = members.begin(); it != members.end(); ++it)
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278 {
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279 if (folders[*it].type() != Json::stringValue)
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280 {
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281 ORTHANC_PLUGINS_LOG_ERROR("The folder to be served \"" + *it +
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282 "\" must be associated with a string value (its mapped URI)");
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283 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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284 }
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285
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286 std::string baseUri = *it;
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287
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288 // Remove the heading and trailing slashes in the root URI, if any
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289 while (!baseUri.empty() &&
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290 *baseUri.begin() == '/')
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291 {
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292 baseUri = baseUri.substr(1);
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293 }
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294
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295 while (!baseUri.empty() &&
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296 *baseUri.rbegin() == '/')
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297 {
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298 baseUri.resize(baseUri.size() - 1);
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299 }
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300
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301 if (baseUri.empty())
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302 {
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303 ORTHANC_PLUGINS_LOG_ERROR("The URI of a folder to be served cannot be empty");
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304 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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305 }
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306
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307 // Check whether the source folder exists and is indeed a directory
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308 const std::string folder = folders[*it].asString();
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309 if (!boost::filesystem::is_directory(folder))
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310 {
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311 ORTHANC_PLUGINS_LOG_ERROR("Trying to serve an inexistent folder: " + folder);
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312 ORTHANC_PLUGINS_THROW_EXCEPTION(InexistentFile);
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313 }
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314
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315 folders_[baseUri] = folder;
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316
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317 // Register the callback to serve the folder
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318 {
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319 const std::string regex = "/(" + baseUri + ")/(.*)";
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320 OrthancPlugins::RegisterRestCallback<ServeFolder>(regex.c_str(), true);
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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 static void ConfigureExtensions(const Json::Value& extensions)
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327 {
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328 if (extensions.type() != Json::objectValue)
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329 {
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330 ORTHANC_PLUGINS_LOG_ERROR("The list of extensions is badly formatted (must be a JSON object)");
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331 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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332 }
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333
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334 Json::Value::Members members = extensions.getMemberNames();
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335
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336 for (Json::Value::Members::const_iterator
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337 it = members.begin(); it != members.end(); ++it)
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338 {
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339 if (extensions[*it].type() != Json::stringValue)
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340 {
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341 ORTHANC_PLUGINS_LOG_ERROR("The file extension \"" + *it +
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342 "\" must be associated with a string value (its MIME type)");
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343 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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344 }
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345
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346 const std::string& mime = extensions[*it].asString();
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347
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348 std::string name = *it;
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349
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350 if (!name.empty() &&
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351 name[0] == '.')
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352 {
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353 name = name.substr(1); // Remove the leading dot "."
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354 }
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355
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356 extensions_[name] = mime;
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357
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358 if (mime.empty())
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359 {
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360 ORTHANC_PLUGINS_LOG_WARNING("ServeFolders: Removing MIME type for file extension \"." +
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361 name + "\"");
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362 }
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363 else
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364 {
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365 ORTHANC_PLUGINS_LOG_WARNING("ServeFolders: Associating file extension \"." + name +
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366 "\" with MIME type \"" + mime + "\"");
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367 }
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368 }
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369 }
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370
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371
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372 static void ReadConfiguration()
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373 {
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374 OrthancPlugins::OrthancConfiguration configuration;
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375
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376 {
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377 OrthancPlugins::OrthancConfiguration globalConfiguration;
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378 globalConfiguration.GetSection(configuration, "ServeFolders");
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379 }
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380
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381 if (!configuration.IsSection("Folders"))
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382 {
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383 // This is a basic configuration
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384 ConfigureFolders(configuration.GetJson());
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385 }
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386 else
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387 {
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388 // This is an advanced configuration
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389 ConfigureFolders(configuration.GetJson()["Folders"]);
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390
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391 bool tmp;
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392
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393 if (configuration.LookupBooleanValue(tmp, "AllowCache"))
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394 {
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395 allowCache_ = tmp;
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396 ORTHANC_PLUGINS_LOG_WARNING("ServeFolders: Requesting the HTTP client to " +
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397 std::string(tmp ? "enable" : "disable") +
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398 " its caching mechanism");
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399 }
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400
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401 if (configuration.LookupBooleanValue(tmp, "GenerateETag"))
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402 {
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403 generateETag_ = tmp;
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404 ORTHANC_PLUGINS_LOG_WARNING("ServeFolders: The computation of an ETag for the served resources is " +
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405 std::string(tmp ? "enabled" : "disabled"));
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406 }
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407
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408 OrthancPlugins::OrthancConfiguration extensions;
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409 configuration.GetSection(extensions, "Extensions");
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410 ConfigureExtensions(extensions.GetJson());
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411 }
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412
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413 if (folders_.empty())
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414 {
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415 ORTHANC_PLUGINS_LOG_WARNING("ServeFolders: Empty configuration file: No additional folder will be served!");
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416 }
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417 }
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418
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419
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420 extern "C"
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421 {
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422 ORTHANC_PLUGINS_API int32_t OrthancPluginInitialize(OrthancPluginContext* context)
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423 {
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424 OrthancPlugins::SetGlobalContext(context, SERVE_FOLDERS_NAME);
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425
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426 /* Check the version of the Orthanc core */
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427 if (OrthancPluginCheckVersion(context) == 0)
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428 {
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429 OrthancPlugins::ReportMinimalOrthancVersion(ORTHANC_PLUGINS_MINIMAL_MAJOR_NUMBER,
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430 ORTHANC_PLUGINS_MINIMAL_MINOR_NUMBER,
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431 ORTHANC_PLUGINS_MINIMAL_REVISION_NUMBER);
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432 return -1;
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433 }
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434
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435 RegisterDefaultExtensions();
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436 OrthancPluginSetDescription2(context, SERVE_FOLDERS_NAME, "Serve additional folders with the HTTP server of Orthanc.");
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437 OrthancPluginSetRootUri2(context, SERVE_FOLDERS_NAME, INDEX_URI);
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438 OrthancPlugins::RegisterRestCallback<ListServedFolders>(INDEX_URI, true);
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439
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440 try
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5a92665dee23 Sample plugin: Serve folders
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441 {
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442 ReadConfiguration();
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443 }
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444 catch (OrthancPlugins::PluginException& e)
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445 {
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446 ORTHANC_PLUGINS_LOG_ERROR("Error while initializing the ServeFolders plugin: " +
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447 std::string(e.What(context)));
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448 }
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449
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450 return 0;
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451 }
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452
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453
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454 ORTHANC_PLUGINS_API void OrthancPluginFinalize()
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455 {
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456 }
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457
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458
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459 ORTHANC_PLUGINS_API const char* OrthancPluginGetName()
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460 {
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461 return SERVE_FOLDERS_NAME;
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462 }
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463
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464
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465 ORTHANC_PLUGINS_API const char* OrthancPluginGetVersion()
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466 {
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467 return SERVE_FOLDERS_VERSION;
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468 }
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469 }