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annotate Plugins/Samples/ServeFolders/Plugin.cpp @ 2336:a95beca72e99 dcmtk-3.6.1

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fix header and query/retrieve in Orthanc Explorer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 17 Jul 2017 11:49:54 +0200
parents ce5c13b95dac
children b382879072a5
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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 Osimis, Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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22 #include "../Common/OrthancPluginCppWrapper.h"
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23
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24 #include <json/reader.h>
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25 #include <json/value.h>
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26 #include <boost/filesystem.hpp>
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27 #include <boost/date_time/posix_time/posix_time.hpp>
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30 #if HAS_ORTHANC_EXCEPTION == 1
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31 # error The macro HAS_ORTHANC_EXCEPTION must be set to 0 to compile this plugin
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32 #endif
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35
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36 static OrthancPluginContext* context_ = NULL;
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37 static std::map<std::string, std::string> extensions_;
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38 static std::map<std::string, std::string> folders_;
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39 static const char* INDEX_URI = "/app/plugin-serve-folders.html";
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40 static bool allowCache_ = false;
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41 static bool generateETag_ = true;
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42
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43
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44 static void SetHttpHeaders(OrthancPluginRestOutput* output)
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45 {
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46 if (!allowCache_)
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47 {
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48 // http://stackoverflow.com/a/2068407/881731
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49 OrthancPluginSetHttpHeader(context_, output, "Cache-Control", "no-cache, no-store, must-revalidate");
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50 OrthancPluginSetHttpHeader(context_, output, "Pragma", "no-cache");
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51 OrthancPluginSetHttpHeader(context_, output, "Expires", "0");
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52 }
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53 }
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55
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56 static void RegisterDefaultExtensions()
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57 {
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58 extensions_["css"] = "text/css";
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59 extensions_["gif"] = "image/gif";
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60 extensions_["html"] = "text/html";
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61 extensions_["jpeg"] = "image/jpeg";
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62 extensions_["jpg"] = "image/jpeg";
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63 extensions_["js"] = "application/javascript";
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64 extensions_["json"] = "application/json";
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65 extensions_["nexe"] = "application/x-nacl";
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66 extensions_["nmf"] = "application/json";
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67 extensions_["pexe"] = "application/x-pnacl";
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68 extensions_["png"] = "image/png";
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69 extensions_["svg"] = "image/svg+xml";
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70 extensions_["woff"] = "application/x-font-woff";
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71 extensions_["xml"] = "application/xml";
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72 }
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73
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74
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75 static std::string GetMimeType(const std::string& path)
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76 {
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77 size_t dot = path.find_last_of('.');
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78
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79 std::string extension = (dot == std::string::npos) ? "" : path.substr(dot + 1);
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80 std::transform(extension.begin(), extension.end(), extension.begin(), tolower);
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81
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82 std::map<std::string, std::string>::const_iterator found = extensions_.find(extension);
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83
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84 if (found != extensions_.end() &&
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85 !found->second.empty())
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86 {
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87 return found->second;
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88 }
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89 else
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90 {
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91 OrthancPlugins::LogWarning(context_, "ServeFolders: Unknown MIME type for extension \"" + extension + "\"");
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92 return "application/octet-stream";
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93 }
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94 }
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95
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96
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97 static bool LookupFolder(std::string& folder,
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98 OrthancPluginRestOutput* output,
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99 const OrthancPluginHttpRequest* request)
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100 {
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101 const std::string uri = request->groups[0];
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102
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103 std::map<std::string, std::string>::const_iterator found = folders_.find(uri);
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104 if (found == folders_.end())
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105 {
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106 OrthancPlugins::LogError(context_, "Unknown URI in plugin server-folders: " + uri);
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107 OrthancPluginSendHttpStatusCode(context_, output, 404);
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108 return false;
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109 }
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110 else
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111 {
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112 folder = found->second;
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113 return true;
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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 static void Answer(OrthancPluginRestOutput* output,
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119 const char* content,
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120 size_t size,
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121 const std::string& mime)
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122 {
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123 if (generateETag_)
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124 {
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125 OrthancPlugins::OrthancString md5(context_);
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126 md5.Assign(OrthancPluginComputeMd5(context_, content, size));
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127
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128 std::string etag = "\"" + std::string(md5.GetContent()) + "\"";
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129 OrthancPluginSetHttpHeader(context_, output, "ETag", etag.c_str());
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130 }
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131
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132 SetHttpHeaders(output);
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133 OrthancPluginAnswerBuffer(context_, output, content, size, mime.c_str());
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134 }
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135
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136
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137 void ServeFolder(OrthancPluginRestOutput* output,
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138 const char* url,
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139 const OrthancPluginHttpRequest* request)
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140 {
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141 namespace fs = boost::filesystem;
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142
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143 if (request->method != OrthancPluginHttpMethod_Get)
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144 {
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145 OrthancPluginSendMethodNotAllowed(context_, output, "GET");
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146 return;
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147 }
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148
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149 std::string folder;
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150
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151 if (LookupFolder(folder, output, request))
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152 {
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153 const fs::path item(request->groups[1]);
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154 const fs::path parent((fs::path(folder) / item).parent_path());
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155
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156 if (item.filename().string() == "index.html" &&
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157 fs::is_directory(parent) &&
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158 !fs::is_regular_file(fs::path(folder) / item))
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159 {
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160 // On-the-fly generation of an "index.html"
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161 std::string s;
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162 s += "<html>\n";
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163 s += " <body>\n";
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164 s += " <ul>\n";
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165
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166 fs::directory_iterator end;
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167
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168 for (fs::directory_iterator it(parent) ; it != end; ++it)
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169 {
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170 if (fs::is_directory(it->status()))
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171 {
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172 std::string f = it->path().filename().string();
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173 s += " <li><a href=\"" + f + "/index.html\">" + f + "/</a></li>\n";
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174 }
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175 }
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176
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177 for (fs::directory_iterator it(parent) ; it != end; ++it)
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178 {
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179 fs::file_type type = it->status().type();
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180
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181 if (type == fs::regular_file ||
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182 type == fs::reparse_file) // cf. BitBucket issue #11
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183 {
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184 std::string f = it->path().filename().string();
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185 s += " <li><a href=\"" + f + "\">" + f + "</a></li>\n";
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186 }
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187 }
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188
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189 s += " </ul>\n";
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190 s += " </body>\n";
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191 s += "</html>\n";
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192
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193 Answer(output, s.c_str(), s.size(), "text/html");
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194 }
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195 else
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196 {
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197 std::string path = folder + "/" + item.string();
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198 std::string mime = GetMimeType(path);
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199
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200 OrthancPlugins::MemoryBuffer content(context_);
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201
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202 try
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203 {
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204 content.ReadFile(path);
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205 }
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206 catch (...)
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207 {
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208 ORTHANC_PLUGINS_THROW_EXCEPTION(InexistentFile);
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209 }
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210
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211 boost::posix_time::ptime lastModification = boost::posix_time::from_time_t(fs::last_write_time(path));
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212 std::string t = boost::posix_time::to_iso_string(lastModification);
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213 OrthancPluginSetHttpHeader(context_, output, "Last-Modified", t.c_str());
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214
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215 Answer(output, content.GetData(), content.GetSize(), mime);
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216 }
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217 }
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218 }
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219
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220
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221 void ListServedFolders(OrthancPluginRestOutput* output,
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222 const char* url,
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223 const OrthancPluginHttpRequest* request)
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224 {
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225 if (request->method != OrthancPluginHttpMethod_Get)
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226 {
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227 OrthancPluginSendMethodNotAllowed(context_, output, "GET");
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228 return;
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229 }
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230
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231 std::string s = "<html><body><h1>Additional folders served by Orthanc</h1>\n";
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232
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233 if (folders_.empty())
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234 {
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235 s += "<p>Empty section <tt>ServeFolders</tt> in your configuration file: No additional folder is served.</p>\n";
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236 }
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237 else
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238 {
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239 s += "<ul>\n";
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240 for (std::map<std::string, std::string>::const_iterator
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241 it = folders_.begin(); it != folders_.end(); ++it)
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242 {
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243 // The URI is relative to INDEX_URI ("/app/plugin-serve-folders.html")
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244 s += "<li><a href=\"../" + it->first + "/index.html\">" + it->first + "</li>\n";
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245 }
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246
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247 s += "</ul>\n";
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248 }
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249
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250 s += "</body></html>\n";
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251
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252 Answer(output, s.c_str(), s.size(), "text/html");
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253 }
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254
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255
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256 static void ConfigureFolders(const Json::Value& folders)
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257 {
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258 if (folders.type() != Json::objectValue)
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259 {
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260 OrthancPlugins::LogError(context_, "The list of folders to be served is badly formatted (must be a JSON object)");
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261 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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262 }
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263
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264 Json::Value::Members members = folders.getMemberNames();
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265
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266 // Register the callback for each base URI
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267 for (Json::Value::Members::const_iterator
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268 it = members.begin(); it != members.end(); ++it)
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269 {
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270 if (folders[*it].type() != Json::stringValue)
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271 {
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272 OrthancPlugins::LogError(context_, "The folder to be served \"" + *it +
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273 "\" must be associated with a string value (its mapped URI)");
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274 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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275 }
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276
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277 std::string baseUri = *it;
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278
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279 // Remove the heading and trailing slashes in the root URI, if any
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280 while (!baseUri.empty() &&
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281 *baseUri.begin() == '/')
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282 {
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283 baseUri = baseUri.substr(1);
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284 }
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285
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286 while (!baseUri.empty() &&
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287 *baseUri.rbegin() == '/')
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288 {
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289 baseUri.resize(baseUri.size() - 1);
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290 }
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291
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292 if (baseUri.empty())
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293 {
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294 OrthancPlugins::LogError(context_, "The URI of a folder to be served cannot be empty");
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295 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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296 }
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297
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298 // Check whether the source folder exists and is indeed a directory
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299 const std::string folder = folders[*it].asString();
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300 if (!boost::filesystem::is_directory(folder))
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301 {
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302 OrthancPlugins::LogError(context_, "Trying and serve an inexistent folder: " + folder);
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303 ORTHANC_PLUGINS_THROW_EXCEPTION(InexistentFile);
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304 }
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305
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306 folders_[baseUri] = folder;
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307
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308 // Register the callback to serve the folder
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309 {
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310 const std::string regex = "/(" + baseUri + ")/(.*)";
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311 OrthancPlugins::RegisterRestCallback<ServeFolder>(context_, regex.c_str(), true);
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312 }
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313 }
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314 }
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315
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316
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317 static void ConfigureExtensions(const Json::Value& extensions)
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318 {
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319 if (extensions.type() != Json::objectValue)
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320 {
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321 OrthancPlugins::LogError(context_, "The list of extensions is badly formatted (must be a JSON object)");
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322 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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323 }
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324
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325 Json::Value::Members members = extensions.getMemberNames();
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326
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327 for (Json::Value::Members::const_iterator
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328 it = members.begin(); it != members.end(); ++it)
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329 {
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330 if (extensions[*it].type() != Json::stringValue)
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331 {
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332 OrthancPlugins::LogError(context_, "The file extension \"" + *it +
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333 "\" must be associated with a string value (its MIME type)");
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334 ORTHANC_PLUGINS_THROW_EXCEPTION(BadFileFormat);
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335 }
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336
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337 const std::string& mime = extensions[*it].asString();
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338
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339 std::string name = *it;
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340
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341 if (!name.empty() &&
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342 name[0] == '.')
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343 {
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344 name = name.substr(1); // Remove the leading dot "."
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345 }
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346
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347 extensions_[name] = mime;
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348
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349 if (mime.empty())
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350 {
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351 OrthancPlugins::LogWarning(context_, "ServeFolders: Removing MIME type for file extension \"." + name + "\"");
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352 }
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353 else
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354 {
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diff changeset
355 OrthancPlugins::LogWarning(context_, "ServeFolders: Associating file extension \"." + name +
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356 "\" with MIME type \"" + mime + "\"");
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357 }
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358 }
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359 }
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diff changeset
360
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diff changeset
361
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362 static void ReadConfiguration()
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363 {
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364 OrthancPlugins::OrthancConfiguration configuration;
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365
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366 {
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367 OrthancPlugins::OrthancConfiguration globalConfiguration(context_);
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368 globalConfiguration.GetSection(configuration, "ServeFolders");
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369 }
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370
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371 if (!configuration.IsSection("Folders"))
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372 {
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373 // This is a basic configuration
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374 ConfigureFolders(configuration.GetJson());
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375 }
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376 else
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377 {
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378 // This is an advanced configuration
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379 ConfigureFolders(configuration.GetJson()["Folders"]);
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380
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diff changeset
381 bool tmp;
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382
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383 if (configuration.LookupBooleanValue(tmp, "AllowCache"))
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384 {
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385 allowCache_ = tmp;
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386 OrthancPlugins::LogWarning(context_, "ServeFolders: Requesting the HTTP client to " +
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387 std::string(tmp ? "enable" : "disable") +
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388 " its caching mechanism");
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389 }
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390
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391 if (configuration.LookupBooleanValue(tmp, "GenerateETag"))
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392 {
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393 generateETag_ = tmp;
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394 OrthancPlugins::LogWarning(context_, "ServeFolders: The computation of an ETag for the served resources is " +
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395 std::string(tmp ? "enabled" : "disabled"));
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396 }
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397
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398 OrthancPlugins::OrthancConfiguration extensions;
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399 configuration.GetSection(extensions, "Extensions");
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400 ConfigureExtensions(extensions.GetJson());
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401 }
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402
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403 if (folders_.empty())
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404 {
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405 OrthancPlugins::LogWarning(context_, "ServeFolders: Empty configuration file: No additional folder will be served!");
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406 }
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407 }
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408
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409
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410 extern "C"
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411 {
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412 ORTHANC_PLUGINS_API int32_t OrthancPluginInitialize(OrthancPluginContext* context)
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413 {
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414 context_ = context;
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415
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416 /* Check the version of the Orthanc core */
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417 if (OrthancPluginCheckVersion(context_) == 0)
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418 {
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419 OrthancPlugins::ReportMinimalOrthancVersion(context_,
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420 ORTHANC_PLUGINS_MINIMAL_MAJOR_NUMBER,
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421 ORTHANC_PLUGINS_MINIMAL_MINOR_NUMBER,
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422 ORTHANC_PLUGINS_MINIMAL_REVISION_NUMBER);
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423 return -1;
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424 }
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425
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426 RegisterDefaultExtensions();
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427 OrthancPluginSetDescription(context_, "Serve additional folders with the HTTP server of Orthanc.");
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428 OrthancPluginSetRootUri(context, INDEX_URI);
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429 OrthancPlugins::RegisterRestCallback<ListServedFolders>(context_, INDEX_URI, true);
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430
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431 try
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432 {
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433 ReadConfiguration();
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434 }
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435 catch (OrthancPlugins::PluginException& e)
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436 {
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437 OrthancPlugins::LogError(context_, "Error while initializing the ServeFolders plugin: " +
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438 std::string(e.What(context_)));
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439 }
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440
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441 return 0;
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442 }
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443
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444
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445 ORTHANC_PLUGINS_API void OrthancPluginFinalize()
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446 {
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447 }
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448
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449
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450 ORTHANC_PLUGINS_API const char* OrthancPluginGetName()
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451 {
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452 return "serve-folders";
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453 }
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454
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455
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456 ORTHANC_PLUGINS_API const char* OrthancPluginGetVersion()
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457 {
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458 return SERVE_FOLDERS_VERSION;
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459 }
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460 }