Mercurial > hg > orthanc
annotate OrthancFramework/Sources/HttpServer/HttpContentNegociation.cpp @ 4831:7053502fbf97
added copyright UCLouvain
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 25 Nov 2021 19:01:11 +0100 |
| parents | d9473bd5ed43 |
| children | 43e613a7756b |
| 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) 2017-2021 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2021 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 } | |
| 52 | |
| 53 if (subtype == "*" && type == type_) | |
| 54 { | |
| 55 return true; | |
| 56 } | |
| 57 | |
| 58 return type == type_ && subtype == subtype_; | |
| 59 } | |
| 60 | |
| 61 | |
| 62 struct HttpContentNegociation::Reference : public boost::noncopyable | |
| 63 { | |
| 64 const Handler& handler_; | |
| 65 uint8_t level_; | |
| 66 float quality_; | |
| 67 | |
| 68 Reference(const Handler& handler, | |
| 69 const std::string& type, | |
| 70 const std::string& subtype, | |
| 71 float quality) : | |
| 72 handler_(handler), | |
| 73 quality_(quality) | |
| 74 { | |
| 75 if (type == "*" && subtype == "*") | |
| 76 { | |
| 77 level_ = 0; | |
| 78 } | |
| 79 else if (subtype == "*") | |
| 80 { | |
| 81 level_ = 1; | |
| 82 } | |
| 83 else | |
| 84 { | |
| 85 level_ = 2; | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 bool operator< (const Reference& other) const | |
| 90 { | |
| 91 if (level_ < other.level_) | |
| 92 { | |
| 93 return true; | |
| 94 } | |
| 95 | |
| 96 if (level_ > other.level_) | |
| 97 { | |
| 98 return false; | |
| 99 } | |
| 100 | |
| 101 return quality_ < other.quality_; | |
| 102 } | |
| 103 }; | |
| 104 | |
| 105 | |
| 106 bool HttpContentNegociation::SplitPair(std::string& first /* out */, | |
| 107 std::string& second /* out */, | |
| 108 const std::string& source, | |
| 109 char separator) | |
| 110 { | |
| 111 size_t pos = source.find(separator); | |
| 112 | |
| 113 if (pos == std::string::npos) | |
| 114 { | |
| 115 return false; | |
| 116 } | |
| 117 else | |
| 118 { | |
| 119 first = Toolbox::StripSpaces(source.substr(0, pos)); | |
| 120 second = Toolbox::StripSpaces(source.substr(pos + 1)); | |
| 121 return true; | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 | |
| 126 float HttpContentNegociation::GetQuality(const Tokens& parameters) | |
| 127 { | |
| 128 for (size_t i = 1; i < parameters.size(); i++) | |
| 129 { | |
| 130 std::string key, value; | |
| 131 if (SplitPair(key, value, parameters[i], '=') && | |
| 132 key == "q") | |
| 133 { | |
| 134 float quality; | |
| 135 bool ok = false; | |
| 136 | |
| 137 try | |
| 138 { | |
| 139 quality = boost::lexical_cast<float>(value); | |
| 140 ok = (quality >= 0.0f && quality <= 1.0f); | |
| 141 } | |
| 142 catch (boost::bad_lexical_cast&) | |
| 143 { | |
| 144 } | |
| 145 | |
| 146 if (ok) | |
| 147 { | |
| 148 return quality; | |
| 149 } | |
| 150 else | |
| 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); |
| 1783 | 155 } |
| 156 } | |
| 157 } | |
| 158 | |
| 159 return 1.0f; // Default quality | |
| 160 } | |
| 161 | |
| 162 | |
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163 void HttpContentNegociation::SelectBestMatch(std::unique_ptr<Reference>& best, |
| 1783 | 164 const Handler& handler, |
| 165 const std::string& type, | |
| 166 const std::string& subtype, | |
| 167 float quality) | |
| 168 { | |
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169 std::unique_ptr<Reference> match(new Reference(handler, type, subtype, quality)); |
| 1783 | 170 |
| 171 if (best.get() == NULL || | |
| 172 *best < *match) | |
| 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 |
| 1783 | 179 } |
| 180 } | |
| 181 | |
| 182 | |
| 183 void HttpContentNegociation::Register(const std::string& mime, | |
| 184 IHandler& handler) | |
| 185 { | |
| 186 std::string type, subtype; | |
| 187 | |
| 188 if (SplitPair(type, subtype, mime, '/') && | |
| 189 type != "*" && | |
| 190 subtype != "*") | |
| 191 { | |
| 192 handlers_.push_back(Handler(type, subtype, handler)); | |
| 193 } | |
| 194 else | |
| 195 { | |
| 196 throw OrthancException(ErrorCode_ParameterOutOfRange); | |
| 197 } | |
| 198 } | |
| 199 | |
| 200 | |
| 201 bool HttpContentNegociation::Apply(const HttpHeaders& headers) | |
| 202 { | |
| 203 HttpHeaders::const_iterator accept = headers.find("accept"); | |
| 204 if (accept != headers.end()) | |
| 205 { | |
| 206 return Apply(accept->second); | |
| 207 } | |
| 208 else | |
| 209 { | |
| 210 return Apply("*/*"); | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 | |
| 215 bool HttpContentNegociation::Apply(const std::string& accept) | |
| 216 { | |
| 217 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1 | |
| 218 // https://en.wikipedia.org/wiki/Content_negotiation | |
| 219 // http://www.newmediacampaigns.com/blog/browser-rest-http-accept-headers | |
| 220 | |
| 221 Tokens mediaRanges; | |
| 222 Toolbox::TokenizeString(mediaRanges, accept, ','); | |
| 223 | |
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224 std::unique_ptr<Reference> bestMatch; |
| 1783 | 225 |
| 226 for (Tokens::const_iterator it = mediaRanges.begin(); | |
| 227 it != mediaRanges.end(); ++it) | |
| 228 { | |
| 229 Tokens parameters; | |
| 230 Toolbox::TokenizeString(parameters, *it, ';'); | |
| 231 | |
| 232 if (parameters.size() > 0) | |
| 233 { | |
| 234 float quality = GetQuality(parameters); | |
| 235 | |
| 236 std::string type, subtype; | |
| 237 if (SplitPair(type, subtype, parameters[0], '/')) | |
| 238 { | |
| 239 for (Handlers::const_iterator it2 = handlers_.begin(); | |
| 240 it2 != handlers_.end(); ++it2) | |
| 241 { | |
| 242 if (it2->IsMatch(type, subtype)) | |
| 243 { | |
| 244 SelectBestMatch(bestMatch, *it2, type, subtype, quality); | |
| 245 } | |
| 246 } | |
| 247 } | |
| 248 } | |
| 249 } | |
| 250 | |
| 251 if (bestMatch.get() == NULL) // No match was found | |
| 252 { | |
| 253 return false; | |
| 254 } | |
| 255 else | |
| 256 { | |
| 257 bestMatch->handler_.Call(); | |
| 258 return true; | |
| 259 } | |
| 260 } | |
| 261 } |