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annotate Core/RestApi/RestApi.cpp @ 1046:00f9f36bcd94

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on-the-fly conversion of JSON to XML according to HTTP Accept
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 18 Jul 2014 17:15:34 +0200
parents 8d1845feb277
children 0332e6e8c679
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege,
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4 * 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 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "RestApi.h"
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35
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36 #include <stdlib.h> // To define "_exit()" under Windows
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37 #include <glog/logging.h>
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38
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39 #include <stdio.h>
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40
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41 namespace Orthanc
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42 {
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43 namespace
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44 {
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45 // Anonymous namespace to avoid clashes between compilation modules
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46 class HttpHandlerVisitor : public RestApiHierarchy::IVisitor
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47 {
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48 private:
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49 RestApi& api_;
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50 RestApiOutput& output_;
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51 HttpMethod method_;
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52 const HttpHandler::Arguments& headers_;
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53 const HttpHandler::Arguments& getArguments_;
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54 const std::string& postData_;
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55
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56 public:
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57 HttpHandlerVisitor(RestApi& api,
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58 RestApiOutput& output,
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59 HttpMethod method,
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60 const HttpHandler::Arguments& headers,
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61 const HttpHandler::Arguments& getArguments,
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62 const std::string& postData) :
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63 api_(api),
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64 output_(output),
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65 method_(method),
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66 headers_(headers),
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67 getArguments_(getArguments),
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68 postData_(postData)
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69 {
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70 }
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71
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72 virtual bool Visit(const RestApiHierarchy::Resource& resource,
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73 const UriComponents& uri,
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74 const HttpHandler::Arguments& components,
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75 const UriComponents& trailing)
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76 {
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77 if (resource.HasHandler(method_))
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78 {
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79 switch (method_)
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80 {
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81 case HttpMethod_Get:
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82 {
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83 RestApiGetCall call(output_, api_, headers_, components, trailing, uri, getArguments_);
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84 resource.Handle(call);
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85 return true;
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86 }
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87
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88 case HttpMethod_Post:
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89 {
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90 RestApiPostCall call(output_, api_, headers_, components, trailing, uri, postData_);
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91 resource.Handle(call);
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92 return true;
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93 }
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94
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95 case HttpMethod_Delete:
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96 {
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97 RestApiDeleteCall call(output_, api_, headers_, components, trailing, uri);
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98 resource.Handle(call);
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99 return true;
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100 }
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101
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102 case HttpMethod_Put:
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103 {
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104 RestApiPutCall call(output_, api_, headers_, components, trailing, uri, postData_);
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105 resource.Handle(call);
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106 return true;
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107 }
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108
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109 default:
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110 return false;
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111 }
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112 }
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113
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114 return false;
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115 }
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116 };
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117 }
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118
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119
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120
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121 static void AddMethod(std::string& target,
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122 const std::string& method)
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123 {
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124 if (target.size() > 0)
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125 target += "," + method;
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126 else
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127 target = method;
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128 }
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129
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130 static std::string MethodsToString(const std::set<HttpMethod>& methods)
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131 {
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132 std::string s;
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133
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134 if (methods.find(HttpMethod_Get) != methods.end())
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135 {
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136 AddMethod(s, "GET");
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137 }
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138
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139 if (methods.find(HttpMethod_Post) != methods.end())
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140 {
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141 AddMethod(s, "POST");
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142 }
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143
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144 if (methods.find(HttpMethod_Put) != methods.end())
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145 {
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146 AddMethod(s, "PUT");
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147 }
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148
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149 if (methods.find(HttpMethod_Delete) != methods.end())
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150 {
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151 AddMethod(s, "DELETE");
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152 }
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153
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154 return s;
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155 }
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156
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157
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158
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159 bool RestApi::Handle(HttpOutput& output,
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160 HttpMethod method,
209
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161 const UriComponents& uri,
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162 const Arguments& headers,
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163 const Arguments& getArguments,
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164 const std::string& postData)
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165 {
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166 RestApiOutput wrappedOutput(output);
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167
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168 #if ORTHANC_PUGIXML_ENABLED == 1
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169 // Look if the user wishes XML answers instead of JSON
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170 // http://www.w3.org/Protocols/HTTP/HTRQ_Headers.html#z3
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171 Arguments::const_iterator it = headers.find("accept");
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172 if (it != headers.end())
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173 {
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174 std::vector<std::string> accepted;
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175 Toolbox::TokenizeString(accepted, it->second, ';');
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176 for (size_t i = 0; i < accepted.size(); i++)
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177 {
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178 if (accepted[i] == "application/xml")
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179 {
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180 wrappedOutput.SetConvertJsonToXml(true);
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181 }
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182
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183 if (accepted[i] == "application/json")
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184 {
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185 wrappedOutput.SetConvertJsonToXml(false);
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186 }
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187 }
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188 }
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189 #endif
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190
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191 HttpHandlerVisitor visitor(*this, wrappedOutput, method, headers, getArguments, postData);
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192
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193 if (root_.LookupResource(uri, visitor))
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7d88f3f4a3b3 refactoring IsServedUri, answer PNG images, regular expression groups
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194 {
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195 return true;
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196 }
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197
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198 Json::Value directory;
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199 if (root_.GetDirectory(directory, uri))
209
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200 {
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201 wrappedOutput.AnswerJson(directory);
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202 return true;
209
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203 }
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204
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205 std::set<HttpMethod> methods;
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206 root_.GetAcceptedMethods(methods, uri);
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207
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208 if (methods.empty())
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209 {
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210 return false; // This URI is not served by this REST API
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211 }
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212 else
209
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213 {
477
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diff changeset
214 LOG(INFO) << "REST method " << EnumerationToString(method)
416
1188cb0ddaa5 http method faking
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diff changeset
215 << " not allowed on: " << Toolbox::FlattenUri(uri);
980
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216
1042
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
217 output.SendMethodNotAllowed(MethodsToString(methods));
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218
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219 return true;
209
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220 }
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221 }
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222
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223 void RestApi::Register(const std::string& path,
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224 RestApiGetCall::Handler handler)
209
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225 {
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diff changeset
226 root_.Register(path, handler);
209
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227 }
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228
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229 void RestApi::Register(const std::string& path,
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230 RestApiPutCall::Handler handler)
209
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diff changeset
231 {
977
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232 root_.Register(path, handler);
209
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233 }
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234
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235 void RestApi::Register(const std::string& path,
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236 RestApiPostCall::Handler handler)
209
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237 {
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238 root_.Register(path, handler);
209
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239 }
9960642f0f45 abstraction of RestApi
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240
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241 void RestApi::Register(const std::string& path,
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242 RestApiDeleteCall::Handler handler)
209
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diff changeset
243 {
977
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diff changeset
244 root_.Register(path, handler);
209
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245 }
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246 }