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annotate OrthancFramework/Sources/HttpServer/HttpContentNegociation.cpp @ 4544:ae63b301d522 Orthanc-1.7.4
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Tue, 02 Mar 2021 16:52:26 +0100 |
| parents | bf7b9edf6b81 |
| children | d9473bd5ed43 |
| 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 | |
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8 * modify it under the terms of the GNU Lesser General Public License |
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9 * as published by the Free Software Foundation, either version 3 of |
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10 * the License, or (at your option) any later version. |
| 1783 | 11 * |
| 12 * This program is distributed in the hope that it will be useful, but | |
| 13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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15 * Lesser General Public License for more details. |
| 1783 | 16 * |
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17 * You should have received a copy of the GNU Lesser General Public |
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18 * License along with this program. If not, see |
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19 * <http://www.gnu.org/licenses/>. |
| 1783 | 20 **/ |
| 21 | |
| 22 | |
| 23 #include "../PrecompiledHeaders.h" | |
| 24 #include "HttpContentNegociation.h" | |
| 25 | |
| 26 #include "../Logging.h" | |
| 27 #include "../OrthancException.h" | |
| 28 #include "../Toolbox.h" | |
| 29 | |
| 30 #include <boost/lexical_cast.hpp> | |
| 31 | |
| 32 namespace Orthanc | |
| 33 { | |
| 34 HttpContentNegociation::Handler::Handler(const std::string& type, | |
| 35 const std::string& subtype, | |
| 36 IHandler& handler) : | |
| 37 type_(type), | |
| 38 subtype_(subtype), | |
| 39 handler_(handler) | |
| 40 { | |
| 41 } | |
| 42 | |
| 43 | |
| 44 bool HttpContentNegociation::Handler::IsMatch(const std::string& type, | |
| 45 const std::string& subtype) const | |
| 46 { | |
| 47 if (type == "*" && subtype == "*") | |
| 48 { | |
| 49 return true; | |
| 50 } | |
| 51 | |
| 52 if (subtype == "*" && type == type_) | |
| 53 { | |
| 54 return true; | |
| 55 } | |
| 56 | |
| 57 return type == type_ && subtype == subtype_; | |
| 58 } | |
| 59 | |
| 60 | |
| 61 struct HttpContentNegociation::Reference : public boost::noncopyable | |
| 62 { | |
| 63 const Handler& handler_; | |
| 64 uint8_t level_; | |
| 65 float quality_; | |
| 66 | |
| 67 Reference(const Handler& handler, | |
| 68 const std::string& type, | |
| 69 const std::string& subtype, | |
| 70 float quality) : | |
| 71 handler_(handler), | |
| 72 quality_(quality) | |
| 73 { | |
| 74 if (type == "*" && subtype == "*") | |
| 75 { | |
| 76 level_ = 0; | |
| 77 } | |
| 78 else if (subtype == "*") | |
| 79 { | |
| 80 level_ = 1; | |
| 81 } | |
| 82 else | |
| 83 { | |
| 84 level_ = 2; | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 bool operator< (const Reference& other) const | |
| 89 { | |
| 90 if (level_ < other.level_) | |
| 91 { | |
| 92 return true; | |
| 93 } | |
| 94 | |
| 95 if (level_ > other.level_) | |
| 96 { | |
| 97 return false; | |
| 98 } | |
| 99 | |
| 100 return quality_ < other.quality_; | |
| 101 } | |
| 102 }; | |
| 103 | |
| 104 | |
| 105 bool HttpContentNegociation::SplitPair(std::string& first /* out */, | |
| 106 std::string& second /* out */, | |
| 107 const std::string& source, | |
| 108 char separator) | |
| 109 { | |
| 110 size_t pos = source.find(separator); | |
| 111 | |
| 112 if (pos == std::string::npos) | |
| 113 { | |
| 114 return false; | |
| 115 } | |
| 116 else | |
| 117 { | |
| 118 first = Toolbox::StripSpaces(source.substr(0, pos)); | |
| 119 second = Toolbox::StripSpaces(source.substr(pos + 1)); | |
| 120 return true; | |
| 121 } | |
| 122 } | |
| 123 | |
| 124 | |
| 125 float HttpContentNegociation::GetQuality(const Tokens& parameters) | |
| 126 { | |
| 127 for (size_t i = 1; i < parameters.size(); i++) | |
| 128 { | |
| 129 std::string key, value; | |
| 130 if (SplitPair(key, value, parameters[i], '=') && | |
| 131 key == "q") | |
| 132 { | |
| 133 float quality; | |
| 134 bool ok = false; | |
| 135 | |
| 136 try | |
| 137 { | |
| 138 quality = boost::lexical_cast<float>(value); | |
| 139 ok = (quality >= 0.0f && quality <= 1.0f); | |
| 140 } | |
| 141 catch (boost::bad_lexical_cast&) | |
| 142 { | |
| 143 } | |
| 144 | |
| 145 if (ok) | |
| 146 { | |
| 147 return quality; | |
| 148 } | |
| 149 else | |
| 150 { | |
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151 throw OrthancException( |
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152 ErrorCode_BadRequest, |
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153 "Quality parameter out of range in a HTTP request (must be between 0 and 1): " + value); |
| 1783 | 154 } |
| 155 } | |
| 156 } | |
| 157 | |
| 158 return 1.0f; // Default quality | |
| 159 } | |
| 160 | |
| 161 | |
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162 void HttpContentNegociation::SelectBestMatch(std::unique_ptr<Reference>& best, |
| 1783 | 163 const Handler& handler, |
| 164 const std::string& type, | |
| 165 const std::string& subtype, | |
| 166 float quality) | |
| 167 { | |
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168 std::unique_ptr<Reference> match(new Reference(handler, type, subtype, quality)); |
| 1783 | 169 |
| 170 if (best.get() == NULL || | |
| 171 *best < *match) | |
| 172 { | |
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173 #if __cplusplus < 201103L |
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174 best.reset(match.release()); |
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175 #else |
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176 best = std::move(match); |
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177 #endif |
| 1783 | 178 } |
| 179 } | |
| 180 | |
| 181 | |
| 182 void HttpContentNegociation::Register(const std::string& mime, | |
| 183 IHandler& handler) | |
| 184 { | |
| 185 std::string type, subtype; | |
| 186 | |
| 187 if (SplitPair(type, subtype, mime, '/') && | |
| 188 type != "*" && | |
| 189 subtype != "*") | |
| 190 { | |
| 191 handlers_.push_back(Handler(type, subtype, handler)); | |
| 192 } | |
| 193 else | |
| 194 { | |
| 195 throw OrthancException(ErrorCode_ParameterOutOfRange); | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 | |
| 200 bool HttpContentNegociation::Apply(const HttpHeaders& headers) | |
| 201 { | |
| 202 HttpHeaders::const_iterator accept = headers.find("accept"); | |
| 203 if (accept != headers.end()) | |
| 204 { | |
| 205 return Apply(accept->second); | |
| 206 } | |
| 207 else | |
| 208 { | |
| 209 return Apply("*/*"); | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 | |
| 214 bool HttpContentNegociation::Apply(const std::string& accept) | |
| 215 { | |
| 216 // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1 | |
| 217 // https://en.wikipedia.org/wiki/Content_negotiation | |
| 218 // http://www.newmediacampaigns.com/blog/browser-rest-http-accept-headers | |
| 219 | |
| 220 Tokens mediaRanges; | |
| 221 Toolbox::TokenizeString(mediaRanges, accept, ','); | |
| 222 | |
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223 std::unique_ptr<Reference> bestMatch; |
| 1783 | 224 |
| 225 for (Tokens::const_iterator it = mediaRanges.begin(); | |
| 226 it != mediaRanges.end(); ++it) | |
| 227 { | |
| 228 Tokens parameters; | |
| 229 Toolbox::TokenizeString(parameters, *it, ';'); | |
| 230 | |
| 231 if (parameters.size() > 0) | |
| 232 { | |
| 233 float quality = GetQuality(parameters); | |
| 234 | |
| 235 std::string type, subtype; | |
| 236 if (SplitPair(type, subtype, parameters[0], '/')) | |
| 237 { | |
| 238 for (Handlers::const_iterator it2 = handlers_.begin(); | |
| 239 it2 != handlers_.end(); ++it2) | |
| 240 { | |
| 241 if (it2->IsMatch(type, subtype)) | |
| 242 { | |
| 243 SelectBestMatch(bestMatch, *it2, type, subtype, quality); | |
| 244 } | |
| 245 } | |
| 246 } | |
| 247 } | |
| 248 } | |
| 249 | |
| 250 if (bestMatch.get() == NULL) // No match was found | |
| 251 { | |
| 252 return false; | |
| 253 } | |
| 254 else | |
| 255 { | |
| 256 bestMatch->handler_.Call(); | |
| 257 return true; | |
| 258 } | |
| 259 } | |
| 260 } |