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annotate Plugins/Samples/ServeFolders/Plugin.cpp @ 2169:d15de5685ad8

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ServeFolders: "Extensions" configuration option
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 22 Nov 2016 15:03:14 +0100
parents 84033563f7f0
children fead5549aaa7
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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 *
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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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19
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21 #include "../Common/OrthancPluginCppWrapper.h"
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22
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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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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 static void Answer(OrthancPluginRestOutput* output,
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112 const char* content,
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113 size_t size,
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114 const std::string& mime)
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115 {
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116 if (generateETag_)
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117 {
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118 OrthancPlugins::OrthancString md5(context_, OrthancPluginComputeMd5(context_, content, size));
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119 std::string etag = "\"" + std::string(md5.GetContent()) + "\"";
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120 OrthancPluginSetHttpHeader(context_, output, "ETag", etag.c_str());
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121 }
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122
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123 SetHttpHeaders(output);
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124 OrthancPluginAnswerBuffer(context_, output, content, size, mime.c_str());
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125 }
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126
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127
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128 void ServeFolder(OrthancPluginRestOutput* output,
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129 const char* url,
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130 const OrthancPluginHttpRequest* request)
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131 {
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132 namespace fs = boost::filesystem;
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133
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134 if (request->method != OrthancPluginHttpMethod_Get)
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135 {
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136 OrthancPluginSendMethodNotAllowed(context_, output, "GET");
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137 return;
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138 }
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139
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140 std::string folder;
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141
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142 if (LookupFolder(folder, output, request))
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143 {
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144 const fs::path item(request->groups[1]);
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145 const fs::path parent((fs::path(folder) / item).parent_path());
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146
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147 if (item.filename().string() == "index.html" &&
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148 fs::is_directory(parent) &&
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149 !fs::is_regular_file(fs::path(folder) / item))
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150 {
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151 // On-the-fly generation of an "index.html"
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152 std::string s;
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153 s += "<html>\n";
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154 s += " <body>\n";
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155 s += " <ul>\n";
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156
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157 fs::directory_iterator end;
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158
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159 for (fs::directory_iterator it(parent) ; it != end; ++it)
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160 {
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161 if (fs::is_directory(it->status()))
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162 {
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163 std::string f = it->path().filename().string();
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164 s += " <li><a href=\"" + f + "/index.html\">" + f + "/</a></li>\n";
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165 }
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166 }
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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 fs::file_type type = it->status().type();
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171
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172 if (type == fs::regular_file ||
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173 type == fs::reparse_file) // cf. BitBucket issue #11
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174 {
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175 std::string f = it->path().filename().string();
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176 s += " <li><a href=\"" + f + "\">" + f + "</a></li>\n";
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177 }
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178 }
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179
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180 s += " </ul>\n";
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181 s += " </body>\n";
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182 s += "</html>\n";
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183
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184 Answer(output, s.c_str(), s.size(), "text/html");
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185 }
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186 else
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187 {
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188 std::string path = folder + "/" + item.string();
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189 std::string mime = GetMimeType(path);
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190
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191 OrthancPlugins::MemoryBuffer content(context_);
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192
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193 try
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194 {
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195 content.ReadFile(path);
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196 }
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197 catch (OrthancPlugins::PluginException&)
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198 {
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199 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_InexistentFile);
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200 }
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201
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202 boost::posix_time::ptime lastModification = boost::posix_time::from_time_t(fs::last_write_time(path));
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203 std::string t = boost::posix_time::to_iso_string(lastModification);
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204 OrthancPluginSetHttpHeader(context_, output, "Last-Modified", t.c_str());
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205
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206 Answer(output, content.GetData(), content.GetSize(), mime);
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207 }
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208 }
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209 }
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210
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211
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212 void ListServedFolders(OrthancPluginRestOutput* output,
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213 const char* url,
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214 const OrthancPluginHttpRequest* request)
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215 {
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216 if (request->method != OrthancPluginHttpMethod_Get)
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217 {
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218 OrthancPluginSendMethodNotAllowed(context_, output, "GET");
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219 return;
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220 }
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221
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222 std::string s = "<html><body><h1>Additional folders served by Orthanc</h1>\n";
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223
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224 if (folders_.empty())
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225 {
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226 s += "<p>Empty section <tt>ServeFolders</tt> in your configuration file: No additional folder is served.</p>\n";
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227 }
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228 else
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229 {
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230 s += "<ul>\n";
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231 for (std::map<std::string, std::string>::const_iterator
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232 it = folders_.begin(); it != folders_.end(); ++it)
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233 {
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234 // The URI is relative to INDEX_URI ("/app/plugin-serve-folders.html")
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235 s += "<li><a href=\"../" + it->first + "/index.html\">" + it->first + "</li>\n";
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236 }
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237
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238 s += "</ul>\n";
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239 }
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240
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241 s += "</body></html>\n";
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242
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243 Answer(output, s.c_str(), s.size(), "text/html");
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244 }
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245
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246
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247 static void ConfigureFolders(const Json::Value& folders)
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248 {
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249 if (folders.type() != Json::objectValue)
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250 {
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251 OrthancPlugins::LogError(context_, "The list of folders to be served is badly formatted (must be a JSON object)");
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252 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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253 }
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254
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255 Json::Value::Members members = folders.getMemberNames();
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256
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257 // Register the callback for each base URI
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258 for (Json::Value::Members::const_iterator
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259 it = members.begin(); it != members.end(); ++it)
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260 {
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261 if (folders[*it].type() != Json::stringValue)
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262 {
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263 OrthancPlugins::LogError(context_, "The folder to be served \"" + *it +
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264 "\" must be associated with a string value (its mapped URI)");
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265 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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266 }
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267
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268 std::string baseUri = *it;
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269
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270 // Remove the heading and trailing slashes in the root URI, if any
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271 while (!baseUri.empty() &&
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272 *baseUri.begin() == '/')
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273 {
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274 baseUri = baseUri.substr(1);
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275 }
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276
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277 while (!baseUri.empty() &&
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278 *baseUri.rbegin() == '/')
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279 {
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280 baseUri.resize(baseUri.size() - 1);
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281 }
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282
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283 if (baseUri.empty())
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284 {
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285 OrthancPlugins::LogError(context_, "The URI of a folder to be served cannot be empty");
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286 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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287 }
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288
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289 // Check whether the source folder exists and is indeed a directory
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290 const std::string folder = folders[*it].asString();
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291 if (!boost::filesystem::is_directory(folder))
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292 {
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293 OrthancPlugins::LogError(context_, "Trying and serve an inexistent folder: " + folder);
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294 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_InexistentFile);
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295 }
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296
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297 folders_[baseUri] = folder;
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298
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299 // Register the callback to serve the folder
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300 {
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301 const std::string regex = "/(" + baseUri + ")/(.*)";
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302 OrthancPlugins::RegisterRestCallback<ServeFolder>(context_, regex.c_str(), true);
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303 }
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304 }
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305 }
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306
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307
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308 static void ConfigureExtensions(const Json::Value& extensions)
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309 {
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310 if (extensions.type() != Json::objectValue)
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311 {
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312 OrthancPlugins::LogError(context_, "The list of extensions is badly formatted (must be a JSON object)");
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313 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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314 }
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315
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316 Json::Value::Members members = extensions.getMemberNames();
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317
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318 for (Json::Value::Members::const_iterator
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319 it = members.begin(); it != members.end(); ++it)
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320 {
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321 if (extensions[*it].type() != Json::stringValue)
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322 {
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323 OrthancPlugins::LogError(context_, "The file extension \"" + *it +
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324 "\" must be associated with a string value (its MIME type)");
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325 throw OrthancPlugins::PluginException(OrthancPluginErrorCode_BadFileFormat);
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326 }
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327
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328 const std::string& mime = extensions[*it].asString();
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329
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330 std::string name = *it;
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331
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332 if (!name.empty() &&
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333 name[0] == '.')
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334 {
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335 name = name.substr(1); // Remove the leading dot "."
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336 }
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diff changeset
337
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338 extensions_[name] = mime;
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339
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340 if (mime.empty())
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341 {
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diff changeset
342 OrthancPlugins::LogWarning(context_, "ServeFolders: Removing MIME type for file extension \"." + name + "\"");
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343 }
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344 else
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345 {
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diff changeset
346 OrthancPlugins::LogWarning(context_, "ServeFolders: Associating file extension \"." + name +
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347 "\" with MIME type \"" + mime + "\"");
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348 }
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349 }
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350 }
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diff changeset
351
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diff changeset
352
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diff changeset
353 static void ReadConfiguration()
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354 {
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355 OrthancPlugins::OrthancConfiguration configuration;
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356
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diff changeset
357 {
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358 OrthancPlugins::OrthancConfiguration globalConfiguration(context_);
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359 globalConfiguration.GetSection(configuration, "ServeFolders");
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360 }
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361
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diff changeset
362 if (!configuration.IsSection("Folders"))
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diff changeset
363 {
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364 // This is a basic configuration
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365 ConfigureFolders(configuration.GetJson());
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366 }
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367 else
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368 {
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369 // This is an advanced configuration
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370 ConfigureFolders(configuration.GetJson()["Folders"]);
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371
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diff changeset
372 bool tmp;
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373
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374 if (configuration.LookupBooleanValue(tmp, "AllowCache"))
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diff changeset
375 {
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diff changeset
376 allowCache_ = tmp;
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diff changeset
377 OrthancPlugins::LogWarning(context_, "ServeFolders: Requesting the HTTP client to " +
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diff changeset
378 std::string(tmp ? "enable" : "disable") +
2167
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diff changeset
379 " its caching mechanism");
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diff changeset
380 }
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diff changeset
381
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diff changeset
382 if (configuration.LookupBooleanValue(tmp, "GenerateETag"))
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diff changeset
383 {
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384 generateETag_ = tmp;
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385 OrthancPlugins::LogWarning(context_, "ServeFolders: The computation of an ETag for the served resources is " +
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386 std::string(tmp ? "enabled" : "disabled"));
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387 }
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388
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389 OrthancPlugins::OrthancConfiguration extensions;
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390 configuration.GetSection(extensions, "Extensions");
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391 ConfigureExtensions(extensions.GetJson());
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392 }
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393
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394 if (folders_.empty())
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395 {
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396 OrthancPlugins::LogWarning(context_, "ServeFolders: Empty configuration file: No additional folder will be served!");
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397 }
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398 }
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399
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400
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401 extern "C"
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402 {
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403 ORTHANC_PLUGINS_API int32_t OrthancPluginInitialize(OrthancPluginContext* context)
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404 {
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405 context_ = context;
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406
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407 /* Check the version of the Orthanc core */
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408 if (OrthancPluginCheckVersion(context_) == 0)
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409 {
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410 char info[1024];
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411 sprintf(info, "Your version of Orthanc (%s) must be above %d.%d.%d to run this plugin",
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412 context_->orthancVersion,
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413 ORTHANC_PLUGINS_MINIMAL_MAJOR_NUMBER,
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414 ORTHANC_PLUGINS_MINIMAL_MINOR_NUMBER,
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415 ORTHANC_PLUGINS_MINIMAL_REVISION_NUMBER);
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416 OrthancPluginLogError(context_, info);
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417 return -1;
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418 }
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419
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420 RegisterDefaultExtensions();
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421 OrthancPluginSetDescription(context_, "Serve additional folders with the HTTP server of Orthanc.");
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422 OrthancPluginSetRootUri(context, INDEX_URI);
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423 OrthancPlugins::RegisterRestCallback<ListServedFolders>(context_, INDEX_URI, true);
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424
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425 try
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426 {
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427 ReadConfiguration();
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428 }
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429 catch (OrthancPlugins::PluginException& e)
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430 {
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431 OrthancPlugins::LogError(context, "Error while initializing the ServeFolders plugin: " +
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432 std::string(e.GetErrorDescription(context)));
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433 return -1;
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434 }
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435
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436 return 0;
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437 }
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438
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439
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440 ORTHANC_PLUGINS_API void OrthancPluginFinalize()
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441 {
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442 }
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443
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444
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445 ORTHANC_PLUGINS_API const char* OrthancPluginGetName()
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446 {
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447 return "serve-folders";
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448 }
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449
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450
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451 ORTHANC_PLUGINS_API const char* OrthancPluginGetVersion()
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452 {
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453 return SERVE_FOLDERS_VERSION;
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454 }
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455 }