Mercurial > hg > orthanc
annotate OrthancFramework/Sources/HttpServer/HttpContentNegociation.cpp @ 5338:78c59b02b121
accept parameters are now provided to HttpContentNegociation::IHandler::Handle()
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 28 Jun 2023 08:29:43 +0200 |
| parents | 0ea402b4d901 |
| children | cb11e5ced4e3 |
| rev | line source |
|---|---|
| 1783 | 1 /** |
| 2 * Orthanc - A Lightweight, RESTful DICOM Store | |
| 1900 | 3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics |
| 1783 | 4 * Department, University Hospital of Liege, Belgium |
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
| 1783 | 7 * |
| 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. |
| 1783 | 12 * |
| 13 * This program is distributed in the hope that it will be useful, but | |
| 14 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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16 * Lesser General Public License for more details. |
| 1783 | 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/>. |
| 1783 | 21 **/ |
| 22 | |
| 23 | |
| 24 #include "../PrecompiledHeaders.h" | |
| 25 #include "HttpContentNegociation.h" | |
| 26 | |
| 27 #include "../Logging.h" | |
| 28 #include "../OrthancException.h" | |
| 29 #include "../Toolbox.h" | |
| 30 | |
| 31 #include <boost/lexical_cast.hpp> | |
| 32 | |
| 33 namespace Orthanc | |
| 34 { | |
| 35 HttpContentNegociation::Handler::Handler(const std::string& type, | |
| 36 const std::string& subtype, | |
| 37 IHandler& handler) : | |
| 38 type_(type), | |
| 39 subtype_(subtype), | |
| 40 handler_(handler) | |
| 41 { | |
| 42 } | |
| 43 | |
| 44 | |
| 45 bool HttpContentNegociation::Handler::IsMatch(const std::string& type, | |
| 46 const std::string& subtype) const | |
| 47 { | |
| 48 if (type == "*" && subtype == "*") | |
| 49 { | |
| 50 return true; | |
| 51 } | |
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52 else if (subtype == "*" && type == type_) |
| 1783 | 53 { |
| 54 return true; | |
| 55 } | |
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56 else |
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57 { |
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58 return type == type_ && subtype == subtype_; |
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59 } |
| 1783 | 60 } |
| 61 | |
| 62 | |
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63 class HttpContentNegociation::Reference : public boost::noncopyable |
| 1783 | 64 { |
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65 private: |
| 1783 | 66 const Handler& handler_; |
| 67 uint8_t level_; | |
| 68 float quality_; | |
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69 std::string application_; |
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70 Dictionary parameters_; |
| 1783 | 71 |
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72 static float GetQuality(const Dictionary& parameters) |
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73 { |
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74 Dictionary::const_iterator found = parameters.find("q"); |
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75 |
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76 if (found != parameters.end()) |
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77 { |
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78 float quality; |
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79 bool ok = false; |
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80 |
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81 try |
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82 { |
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83 quality = boost::lexical_cast<float>(found->second); |
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84 ok = (quality >= 0.0f && quality <= 1.0f); |
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85 } |
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86 catch (boost::bad_lexical_cast&) |
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87 { |
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88 } |
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89 |
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90 if (ok) |
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91 { |
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92 return quality; |
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93 } |
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94 else |
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95 { |
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96 throw OrthancException( |
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97 ErrorCode_BadRequest, |
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98 "Quality parameter out of range in a HTTP request (must be between 0 and 1): " + found->second); |
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99 } |
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100 } |
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101 else |
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102 { |
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103 return 1.0f; // Default quality |
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104 } |
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105 } |
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106 |
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107 public: |
| 1783 | 108 Reference(const Handler& handler, |
| 109 const std::string& type, | |
| 110 const std::string& subtype, | |
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111 const Dictionary& parameters) : |
| 1783 | 112 handler_(handler), |
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113 quality_(GetQuality(parameters)), |
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114 application_(type + "/" + subtype), |
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115 parameters_(parameters) |
| 1783 | 116 { |
| 117 if (type == "*" && subtype == "*") | |
| 118 { | |
| 119 level_ = 0; | |
| 120 } | |
| 121 else if (subtype == "*") | |
| 122 { | |
| 123 level_ = 1; | |
| 124 } | |
| 125 else | |
| 126 { | |
| 127 level_ = 2; | |
| 128 } | |
| 129 } | |
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130 |
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131 void Call() const |
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132 { |
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133 handler_.Call(parameters_); |
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134 } |
| 1783 | 135 |
| 136 bool operator< (const Reference& other) const | |
| 137 { | |
| 138 if (level_ < other.level_) | |
| 139 { | |
| 140 return true; | |
| 141 } | |
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142 else if (level_ > other.level_) |
| 1783 | 143 { |
| 144 return false; | |
| 145 } | |
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146 else |
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147 { |
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148 return quality_ < other.quality_; |
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149 } |
| 1783 | 150 } |
| 151 }; | |
| 152 | |
| 153 | |
| 154 bool HttpContentNegociation::SplitPair(std::string& first /* out */, | |
| 155 std::string& second /* out */, | |
| 156 const std::string& source, | |
| 157 char separator) | |
| 158 { | |
| 159 size_t pos = source.find(separator); | |
| 160 | |
| 161 if (pos == std::string::npos) | |
| 162 { | |
| 163 return false; | |
| 164 } | |
| 165 else | |
| 166 { | |
| 167 first = Toolbox::StripSpaces(source.substr(0, pos)); | |
| 168 second = Toolbox::StripSpaces(source.substr(pos + 1)); | |
| 169 return true; | |
| 170 } | |
| 171 } | |
| 172 | |
| 173 | |
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174 void HttpContentNegociation::SelectBestMatch(std::unique_ptr<Reference>& target, |
| 1783 | 175 const Handler& handler, |
| 176 const std::string& type, | |
| 177 const std::string& subtype, | |
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178 const Dictionary& parameters) |
| 1783 | 179 { |
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180 std::unique_ptr<Reference> match(new Reference(handler, type, subtype, parameters)); |
| 1783 | 181 |
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182 if (target.get() == NULL || |
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183 *target < *match) |
| 1783 | 184 { |
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185 #if __cplusplus < 201103L |
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186 target.reset(match.release()); |
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187 #else |
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188 target = std::move(match); |
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189 #endif |
| 1783 | 190 } |
| 191 } | |
| 192 | |
| 193 | |
| 194 void HttpContentNegociation::Register(const std::string& mime, | |
| 195 IHandler& handler) | |
| 196 { | |
| 197 std::string type, subtype; | |
| 198 | |
| 199 if (SplitPair(type, subtype, mime, '/') && | |
| 200 type != "*" && | |
| 201 subtype != "*") | |
| 202 { | |
| 203 handlers_.push_back(Handler(type, subtype, handler)); | |
| 204 } | |
| 205 else | |
| 206 { | |
| 207 throw OrthancException(ErrorCode_ParameterOutOfRange); | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 | |
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212 bool HttpContentNegociation::Apply(const Dictionary& headers) |
| 1783 | 213 { |
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214 Dictionary::const_iterator accept = headers.find("accept"); |
| 1783 | 215 if (accept != headers.end()) |
| 216 { | |
| 217 return Apply(accept->second); | |
| 218 } | |
| 219 else | |
| 220 { | |
| 221 return Apply("*/*"); | |
| 222 } | |
| 223 } | |
| 224 | |
| 225 | |
| 226 bool HttpContentNegociation::Apply(const std::string& accept) | |
| 227 { | |
| 228 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1 | |
| 229 // https://en.wikipedia.org/wiki/Content_negotiation | |
| 230 // http://www.newmediacampaigns.com/blog/browser-rest-http-accept-headers | |
| 231 | |
| 232 Tokens mediaRanges; | |
| 233 Toolbox::TokenizeString(mediaRanges, accept, ','); | |
| 234 | |
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235 std::unique_ptr<Reference> bestMatch; |
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236 Dictionary bestParameters; |
| 1783 | 237 |
| 238 for (Tokens::const_iterator it = mediaRanges.begin(); | |
| 239 it != mediaRanges.end(); ++it) | |
| 240 { | |
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241 Tokens tokens; |
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242 Toolbox::TokenizeString(tokens, *it, ';'); |
| 1783 | 243 |
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244 if (tokens.size() > 0) |
| 1783 | 245 { |
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246 Dictionary parameters; |
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247 for (size_t i = 1; i < tokens.size(); i++) |
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248 { |
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249 std::string key, value; |
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250 |
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251 if (!SplitPair(key, value, tokens[i], '=')) |
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252 { |
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253 key = Toolbox::StripSpaces(tokens[i]); |
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254 value = ""; |
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255 } |
| 1783 | 256 |
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257 parameters[key] = value; |
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258 } |
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259 |
| 1783 | 260 std::string type, subtype; |
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261 if (SplitPair(type, subtype, tokens[0], '/')) |
| 1783 | 262 { |
| 263 for (Handlers::const_iterator it2 = handlers_.begin(); | |
| 264 it2 != handlers_.end(); ++it2) | |
| 265 { | |
| 266 if (it2->IsMatch(type, subtype)) | |
| 267 { | |
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268 SelectBestMatch(bestMatch, *it2, type, subtype, parameters); |
| 1783 | 269 } |
| 270 } | |
| 271 } | |
| 272 } | |
| 273 } | |
| 274 | |
| 275 if (bestMatch.get() == NULL) // No match was found | |
| 276 { | |
| 277 return false; | |
| 278 } | |
| 279 else | |
| 280 { | |
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281 bestMatch->Call(); |
| 1783 | 282 return true; |
| 283 } | |
| 284 } | |
| 285 } |