Mercurial > hg > orthanc
annotate Core/HttpServer/HttpContentNegociation.cpp @ 3844:c9c34bb50f0a
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 16 Apr 2020 17:27:18 +0200 |
| parents | 2a170a8f1faf |
| children |
| 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) 2017-2020 Osimis S.A., Belgium |
| 1783 | 6 * |
| 7 * This program is free software: you can redistribute it and/or | |
| 8 * modify it under the terms of the GNU General Public License as | |
| 9 * published by the Free Software Foundation, either version 3 of the | |
| 10 * License, or (at your option) any later version. | |
| 11 * | |
| 12 * In addition, as a special exception, the copyright holders of this | |
| 13 * program give permission to link the code of its release with the | |
| 14 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
| 15 * that use the same license as the "OpenSSL" library), and distribute | |
| 16 * the linked executables. You must obey the GNU General Public License | |
| 17 * in all respects for all of the code used other than "OpenSSL". If you | |
| 18 * modify file(s) with this exception, you may extend this exception to | |
| 19 * your version of the file(s), but you are not obligated to do so. If | |
| 20 * you do not wish to do so, delete this exception statement from your | |
| 21 * version. If you delete this exception statement from all source files | |
| 22 * in the program, then also delete it here. | |
| 23 * | |
| 24 * This program is distributed in the hope that it will be useful, but | |
| 25 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 27 * General Public License for more details. | |
| 28 * | |
| 29 * You should have received a copy of the GNU General Public License | |
| 30 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 31 **/ | |
| 32 | |
| 33 | |
| 34 #include "../PrecompiledHeaders.h" | |
| 35 #include "HttpContentNegociation.h" | |
| 36 | |
| 37 #include "../Logging.h" | |
| 38 #include "../OrthancException.h" | |
| 39 #include "../Toolbox.h" | |
| 40 | |
| 41 #include <boost/lexical_cast.hpp> | |
| 42 | |
| 43 namespace Orthanc | |
| 44 { | |
| 45 HttpContentNegociation::Handler::Handler(const std::string& type, | |
| 46 const std::string& subtype, | |
| 47 IHandler& handler) : | |
| 48 type_(type), | |
| 49 subtype_(subtype), | |
| 50 handler_(handler) | |
| 51 { | |
| 52 } | |
| 53 | |
| 54 | |
| 55 bool HttpContentNegociation::Handler::IsMatch(const std::string& type, | |
| 56 const std::string& subtype) const | |
| 57 { | |
| 58 if (type == "*" && subtype == "*") | |
| 59 { | |
| 60 return true; | |
| 61 } | |
| 62 | |
| 63 if (subtype == "*" && type == type_) | |
| 64 { | |
| 65 return true; | |
| 66 } | |
| 67 | |
| 68 return type == type_ && subtype == subtype_; | |
| 69 } | |
| 70 | |
| 71 | |
| 72 struct HttpContentNegociation::Reference : public boost::noncopyable | |
| 73 { | |
| 74 const Handler& handler_; | |
| 75 uint8_t level_; | |
| 76 float quality_; | |
| 77 | |
| 78 Reference(const Handler& handler, | |
| 79 const std::string& type, | |
| 80 const std::string& subtype, | |
| 81 float quality) : | |
| 82 handler_(handler), | |
| 83 quality_(quality) | |
| 84 { | |
| 85 if (type == "*" && subtype == "*") | |
| 86 { | |
| 87 level_ = 0; | |
| 88 } | |
| 89 else if (subtype == "*") | |
| 90 { | |
| 91 level_ = 1; | |
| 92 } | |
| 93 else | |
| 94 { | |
| 95 level_ = 2; | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 bool operator< (const Reference& other) const | |
| 100 { | |
| 101 if (level_ < other.level_) | |
| 102 { | |
| 103 return true; | |
| 104 } | |
| 105 | |
| 106 if (level_ > other.level_) | |
| 107 { | |
| 108 return false; | |
| 109 } | |
| 110 | |
| 111 return quality_ < other.quality_; | |
| 112 } | |
| 113 }; | |
| 114 | |
| 115 | |
| 116 bool HttpContentNegociation::SplitPair(std::string& first /* out */, | |
| 117 std::string& second /* out */, | |
| 118 const std::string& source, | |
| 119 char separator) | |
| 120 { | |
| 121 size_t pos = source.find(separator); | |
| 122 | |
| 123 if (pos == std::string::npos) | |
| 124 { | |
| 125 return false; | |
| 126 } | |
| 127 else | |
| 128 { | |
| 129 first = Toolbox::StripSpaces(source.substr(0, pos)); | |
| 130 second = Toolbox::StripSpaces(source.substr(pos + 1)); | |
| 131 return true; | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 | |
| 136 float HttpContentNegociation::GetQuality(const Tokens& parameters) | |
| 137 { | |
| 138 for (size_t i = 1; i < parameters.size(); i++) | |
| 139 { | |
| 140 std::string key, value; | |
| 141 if (SplitPair(key, value, parameters[i], '=') && | |
| 142 key == "q") | |
| 143 { | |
| 144 float quality; | |
| 145 bool ok = false; | |
| 146 | |
| 147 try | |
| 148 { | |
| 149 quality = boost::lexical_cast<float>(value); | |
| 150 ok = (quality >= 0.0f && quality <= 1.0f); | |
| 151 } | |
| 152 catch (boost::bad_lexical_cast&) | |
| 153 { | |
| 154 } | |
| 155 | |
| 156 if (ok) | |
| 157 { | |
| 158 return quality; | |
| 159 } | |
| 160 else | |
| 161 { | |
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162 throw OrthancException( |
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163 ErrorCode_BadRequest, |
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164 "Quality parameter out of range in a HTTP request (must be between 0 and 1): " + value); |
| 1783 | 165 } |
| 166 } | |
| 167 } | |
| 168 | |
| 169 return 1.0f; // Default quality | |
| 170 } | |
| 171 | |
| 172 | |
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173 void HttpContentNegociation::SelectBestMatch(std::unique_ptr<Reference>& best, |
| 1783 | 174 const Handler& handler, |
| 175 const std::string& type, | |
| 176 const std::string& subtype, | |
| 177 float quality) | |
| 178 { | |
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179 std::unique_ptr<Reference> match(new Reference(handler, type, subtype, quality)); |
| 1783 | 180 |
| 181 if (best.get() == NULL || | |
| 182 *best < *match) | |
| 183 { | |
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184 #if __cplusplus < 201103L |
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185 best.reset(match.release()); |
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186 #else |
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187 best = std::move(match); |
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188 #endif |
| 1783 | 189 } |
| 190 } | |
| 191 | |
| 192 | |
| 193 void HttpContentNegociation::Register(const std::string& mime, | |
| 194 IHandler& handler) | |
| 195 { | |
| 196 std::string type, subtype; | |
| 197 | |
| 198 if (SplitPair(type, subtype, mime, '/') && | |
| 199 type != "*" && | |
| 200 subtype != "*") | |
| 201 { | |
| 202 handlers_.push_back(Handler(type, subtype, handler)); | |
| 203 } | |
| 204 else | |
| 205 { | |
| 206 throw OrthancException(ErrorCode_ParameterOutOfRange); | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 | |
| 211 bool HttpContentNegociation::Apply(const HttpHeaders& headers) | |
| 212 { | |
| 213 HttpHeaders::const_iterator accept = headers.find("accept"); | |
| 214 if (accept != headers.end()) | |
| 215 { | |
| 216 return Apply(accept->second); | |
| 217 } | |
| 218 else | |
| 219 { | |
| 220 return Apply("*/*"); | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 | |
| 225 bool HttpContentNegociation::Apply(const std::string& accept) | |
| 226 { | |
| 227 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1 | |
| 228 // https://en.wikipedia.org/wiki/Content_negotiation | |
| 229 // http://www.newmediacampaigns.com/blog/browser-rest-http-accept-headers | |
| 230 | |
| 231 Tokens mediaRanges; | |
| 232 Toolbox::TokenizeString(mediaRanges, accept, ','); | |
| 233 | |
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234 std::unique_ptr<Reference> bestMatch; |
| 1783 | 235 |
| 236 for (Tokens::const_iterator it = mediaRanges.begin(); | |
| 237 it != mediaRanges.end(); ++it) | |
| 238 { | |
| 239 Tokens parameters; | |
| 240 Toolbox::TokenizeString(parameters, *it, ';'); | |
| 241 | |
| 242 if (parameters.size() > 0) | |
| 243 { | |
| 244 float quality = GetQuality(parameters); | |
| 245 | |
| 246 std::string type, subtype; | |
| 247 if (SplitPair(type, subtype, parameters[0], '/')) | |
| 248 { | |
| 249 for (Handlers::const_iterator it2 = handlers_.begin(); | |
| 250 it2 != handlers_.end(); ++it2) | |
| 251 { | |
| 252 if (it2->IsMatch(type, subtype)) | |
| 253 { | |
| 254 SelectBestMatch(bestMatch, *it2, type, subtype, quality); | |
| 255 } | |
| 256 } | |
| 257 } | |
| 258 } | |
| 259 } | |
| 260 | |
| 261 if (bestMatch.get() == NULL) // No match was found | |
| 262 { | |
| 263 return false; | |
| 264 } | |
| 265 else | |
| 266 { | |
| 267 bestMatch->handler_.Call(); | |
| 268 return true; | |
| 269 } | |
| 270 } | |
| 271 } |