annotate OrthancFramework/Sources/HttpServer/HttpContentNegociation.cpp @ 4844:55e8fb8e8028

tagging a pre-release of the Orthanc framework for WSI 1.1
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 07 Dec 2021 14:01:17 +0100
parents 7053502fbf97
children 43e613a7756b
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "HttpContentNegociation.h"
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26
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27 #include "../Logging.h"
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28 #include "../OrthancException.h"
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29 #include "../Toolbox.h"
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30
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31 #include <boost/lexical_cast.hpp>
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32
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33 namespace Orthanc
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34 {
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35 HttpContentNegociation::Handler::Handler(const std::string& type,
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36 const std::string& subtype,
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37 IHandler& handler) :
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38 type_(type),
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39 subtype_(subtype),
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40 handler_(handler)
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41 {
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42 }
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43
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44
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45 bool HttpContentNegociation::Handler::IsMatch(const std::string& type,
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46 const std::string& subtype) const
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47 {
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48 if (type == "*" && subtype == "*")
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49 {
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50 return true;
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51 }
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52
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53 if (subtype == "*" && type == type_)
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54 {
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55 return true;
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56 }
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57
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58 return type == type_ && subtype == subtype_;
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59 }
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60
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61
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62 struct HttpContentNegociation::Reference : public boost::noncopyable
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63 {
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64 const Handler& handler_;
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65 uint8_t level_;
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66 float quality_;
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67
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68 Reference(const Handler& handler,
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69 const std::string& type,
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70 const std::string& subtype,
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71 float quality) :
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72 handler_(handler),
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73 quality_(quality)
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74 {
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75 if (type == "*" && subtype == "*")
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76 {
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77 level_ = 0;
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78 }
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79 else if (subtype == "*")
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80 {
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81 level_ = 1;
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82 }
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83 else
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84 {
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85 level_ = 2;
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86 }
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87 }
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88
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89 bool operator< (const Reference& other) const
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90 {
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91 if (level_ < other.level_)
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92 {
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93 return true;
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94 }
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95
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96 if (level_ > other.level_)
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97 {
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98 return false;
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99 }
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100
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101 return quality_ < other.quality_;
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102 }
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103 };
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104
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105
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106 bool HttpContentNegociation::SplitPair(std::string& first /* out */,
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107 std::string& second /* out */,
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108 const std::string& source,
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109 char separator)
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110 {
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111 size_t pos = source.find(separator);
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112
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113 if (pos == std::string::npos)
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114 {
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115 return false;
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116 }
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117 else
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118 {
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119 first = Toolbox::StripSpaces(source.substr(0, pos));
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120 second = Toolbox::StripSpaces(source.substr(pos + 1));
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121 return true;
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122 }
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123 }
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124
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125
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126 float HttpContentNegociation::GetQuality(const Tokens& parameters)
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127 {
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128 for (size_t i = 1; i < parameters.size(); i++)
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129 {
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130 std::string key, value;
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131 if (SplitPair(key, value, parameters[i], '=') &&
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132 key == "q")
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133 {
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134 float quality;
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135 bool ok = false;
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136
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137 try
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138 {
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139 quality = boost::lexical_cast<float>(value);
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140 ok = (quality >= 0.0f && quality <= 1.0f);
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141 }
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142 catch (boost::bad_lexical_cast&)
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143 {
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144 }
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145
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146 if (ok)
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147 {
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148 return quality;
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149 }
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150 else
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151 {
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152 throw OrthancException(
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153 ErrorCode_BadRequest,
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154 "Quality parameter out of range in a HTTP request (must be between 0 and 1): " + value);
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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 return 1.0f; // Default quality
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160 }
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161
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162
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163 void HttpContentNegociation::SelectBestMatch(std::unique_ptr<Reference>& best,
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164 const Handler& handler,
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165 const std::string& type,
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166 const std::string& subtype,
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167 float quality)
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168 {
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169 std::unique_ptr<Reference> match(new Reference(handler, type, subtype, quality));
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170
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171 if (best.get() == NULL ||
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172 *best < *match)
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173 {
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174 #if __cplusplus < 201103L
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175 best.reset(match.release());
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176 #else
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177 best = std::move(match);
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178 #endif
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179 }
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180 }
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181
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182
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183 void HttpContentNegociation::Register(const std::string& mime,
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184 IHandler& handler)
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185 {
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186 std::string type, subtype;
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187
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188 if (SplitPair(type, subtype, mime, '/') &&
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189 type != "*" &&
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190 subtype != "*")
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191 {
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192 handlers_.push_back(Handler(type, subtype, handler));
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193 }
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194 else
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195 {
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196 throw OrthancException(ErrorCode_ParameterOutOfRange);
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197 }
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198 }
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199
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200
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201 bool HttpContentNegociation::Apply(const HttpHeaders& headers)
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202 {
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203 HttpHeaders::const_iterator accept = headers.find("accept");
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204 if (accept != headers.end())
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205 {
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206 return Apply(accept->second);
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207 }
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208 else
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209 {
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210 return Apply("*/*");
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211 }
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212 }
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213
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214
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215 bool HttpContentNegociation::Apply(const std::string& accept)
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216 {
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217 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1
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218 // https://en.wikipedia.org/wiki/Content_negotiation
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219 // http://www.newmediacampaigns.com/blog/browser-rest-http-accept-headers
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220
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221 Tokens mediaRanges;
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222 Toolbox::TokenizeString(mediaRanges, accept, ',');
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223
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224 std::unique_ptr<Reference> bestMatch;
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225
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226 for (Tokens::const_iterator it = mediaRanges.begin();
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227 it != mediaRanges.end(); ++it)
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228 {
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229 Tokens parameters;
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230 Toolbox::TokenizeString(parameters, *it, ';');
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231
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232 if (parameters.size() > 0)
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233 {
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234 float quality = GetQuality(parameters);
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235
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236 std::string type, subtype;
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237 if (SplitPair(type, subtype, parameters[0], '/'))
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238 {
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239 for (Handlers::const_iterator it2 = handlers_.begin();
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240 it2 != handlers_.end(); ++it2)
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241 {
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242 if (it2->IsMatch(type, subtype))
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243 {
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244 SelectBestMatch(bestMatch, *it2, type, subtype, quality);
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245 }
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246 }
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247 }
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248 }
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249 }
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250
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251 if (bestMatch.get() == NULL) // No match was found
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252 {
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253 return false;
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254 }
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255 else
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256 {
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257 bestMatch->handler_.Call();
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258 return true;
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259 }
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260 }
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261 }