Mercurial > hg > orthanc
annotate Core/HttpServer/HttpOutput.cpp @ 1519:8bd0d897763f
refactoring: IHttpStreamAnswer
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 11 Aug 2015 13:15:16 +0200 |
parents | 4f8c8ef114db |
children | 3606278d305e |
rev | line source |
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0 | 1 /** |
59 | 2 * Orthanc - A Lightweight, RESTful DICOM Store |
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics |
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4 * Department, University Hospital of Liege, Belgium |
0 | 5 * |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
136 | 10 * |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
0 | 22 * |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
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33 #include "../PrecompiledHeaders.h" |
0 | 34 #include "HttpOutput.h" |
35 | |
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36 #include "../Logging.h" |
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37 #include "../OrthancException.h" |
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38 #include "../Toolbox.h" |
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39 #include "../Compression/GzipCompressor.h" |
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40 #include "../Compression/ZlibCompressor.h" |
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41 |
324 | 42 #include <iostream> |
0 | 43 #include <vector> |
44 #include <stdio.h> | |
45 #include <boost/lexical_cast.hpp> | |
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46 |
0 | 47 |
59 | 48 namespace Orthanc |
0 | 49 { |
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50 HttpOutput::StateMachine::StateMachine(IHttpOutputStream& stream, |
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51 bool isKeepAlive) : |
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52 stream_(stream), |
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53 state_(State_WritingHeader), |
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54 status_(HttpStatus_200_Ok), |
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55 hasContentLength_(false), |
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56 contentPosition_(0), |
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57 keepAlive_(isKeepAlive) |
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58 { |
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59 } |
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60 |
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61 HttpOutput::StateMachine::~StateMachine() |
910 | 62 { |
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63 if (state_ != State_Done) |
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64 { |
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65 //asm volatile ("int3;"); |
1200 | 66 //LOG(ERROR) << "This HTTP answer does not contain any body"; |
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67 } |
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68 |
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69 if (hasContentLength_ && contentPosition_ != contentLength_) |
910 | 70 { |
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71 LOG(ERROR) << "This HTTP answer has not sent the proper number of bytes in its body"; |
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72 } |
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73 } |
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74 |
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75 |
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76 void HttpOutput::StateMachine::SetHttpStatus(HttpStatus status) |
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77 { |
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78 if (state_ != State_WritingHeader) |
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79 { |
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80 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
910 | 81 } |
82 | |
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83 status_ = status; |
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84 } |
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85 |
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86 |
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87 void HttpOutput::StateMachine::SetContentLength(uint64_t length) |
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88 { |
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89 if (state_ != State_WritingHeader) |
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90 { |
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91 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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92 } |
910 | 93 |
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94 hasContentLength_ = true; |
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95 contentLength_ = length; |
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96 } |
910 | 97 |
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98 void HttpOutput::StateMachine::SetContentType(const char* contentType) |
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99 { |
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100 AddHeader("Content-Type", contentType); |
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101 } |
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102 |
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103 void HttpOutput::StateMachine::SetContentFilename(const char* filename) |
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104 { |
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105 // TODO Escape double quotes |
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106 AddHeader("Content-Disposition", "filename=\"" + std::string(filename) + "\""); |
910 | 107 } |
108 | |
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109 void HttpOutput::StateMachine::SetCookie(const std::string& cookie, |
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110 const std::string& value) |
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111 { |
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112 if (state_ != State_WritingHeader) |
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113 { |
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114 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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115 } |
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116 |
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117 // TODO Escape "=" characters |
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118 AddHeader("Set-Cookie", cookie + "=" + value); |
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119 } |
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120 |
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121 |
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122 void HttpOutput::StateMachine::AddHeader(const std::string& header, |
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123 const std::string& value) |
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124 { |
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125 if (state_ != State_WritingHeader) |
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126 { |
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127 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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128 } |
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129 |
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130 headers_.push_back(header + ": " + value + "\r\n"); |
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131 } |
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132 |
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133 void HttpOutput::StateMachine::ClearHeaders() |
910 | 134 { |
135 if (state_ != State_WritingHeader) | |
136 { | |
137 throw OrthancException(ErrorCode_BadSequenceOfCalls); | |
138 } | |
139 | |
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140 headers_.clear(); |
910 | 141 } |
142 | |
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143 void HttpOutput::StateMachine::SendBody(const void* buffer, size_t length) |
910 | 144 { |
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145 if (state_ == State_Done) |
910 | 146 { |
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147 if (length == 0) |
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148 { |
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149 return; |
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150 } |
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151 else |
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152 { |
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153 LOG(ERROR) << "Because of keep-alive connections, the entire body must be sent at once or Content-Length must be given"; |
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154 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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155 } |
910 | 156 } |
157 | |
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158 if (state_ == State_WritingMultipart) |
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159 { |
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160 throw OrthancException(ErrorCode_InternalError); |
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161 } |
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162 |
910 | 163 if (state_ == State_WritingHeader) |
164 { | |
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165 // Send the HTTP header before writing the body |
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166 |
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167 stream_.OnHttpStatusReceived(status_); |
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168 |
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169 std::string s = "HTTP/1.1 " + |
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170 boost::lexical_cast<std::string>(status_) + |
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171 " " + std::string(EnumerationToString(status_)) + |
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172 "\r\n"; |
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173 |
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174 if (keepAlive_) |
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175 { |
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176 s += "Connection: keep-alive\r\n"; |
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177 } |
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178 |
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179 for (std::list<std::string>::const_iterator |
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180 it = headers_.begin(); it != headers_.end(); ++it) |
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181 { |
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182 s += *it; |
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183 } |
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184 |
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185 if (status_ != HttpStatus_200_Ok) |
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186 { |
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187 hasContentLength_ = false; |
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188 } |
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189 |
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190 uint64_t contentLength = (hasContentLength_ ? contentLength_ : length); |
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191 s += "Content-Length: " + boost::lexical_cast<std::string>(contentLength) + "\r\n\r\n"; |
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192 |
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193 stream_.Send(true, s.c_str(), s.size()); |
910 | 194 state_ = State_WritingBody; |
195 } | |
196 | |
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197 if (hasContentLength_ && |
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198 contentPosition_ + length > contentLength_) |
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199 { |
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200 LOG(ERROR) << "The body size exceeds what was declared with SetContentSize()"; |
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201 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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202 } |
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203 |
910 | 204 if (length > 0) |
205 { | |
911 | 206 stream_.Send(false, buffer, length); |
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207 contentPosition_ += length; |
330 | 208 } |
209 | |
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210 if (!hasContentLength_ || |
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211 contentPosition_ == contentLength_) |
330 | 212 { |
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213 state_ = State_Done; |
330 | 214 } |
215 } | |
216 | |
207 | 217 |
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218 void HttpOutput::StateMachine::CloseBody() |
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219 { |
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220 switch (state_) |
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221 { |
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222 case State_WritingHeader: |
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223 LOG(ERROR) << "Closing the HTTP body, but the header has not been sent yet"; |
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224 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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225 |
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226 case State_WritingBody: |
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227 if (!hasContentLength_ || |
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228 contentPosition_ == contentLength_) |
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229 { |
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230 state_ = State_Done; |
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231 } |
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232 else |
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233 { |
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234 LOG(ERROR) << "The body size has not reached what was declared with SetContentSize()"; |
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235 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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236 } |
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237 |
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238 break; |
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239 |
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240 case State_WritingMultipart: |
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241 LOG(ERROR) << "Cannot invoke CloseBody() with multipart outputs"; |
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242 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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243 |
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244 case State_Done: |
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245 return; // Ignore |
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246 |
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247 default: |
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248 throw OrthancException(ErrorCode_InternalError); |
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249 } |
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250 } |
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251 |
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252 |
1517 | 253 HttpCompression HttpOutput::GetPreferredCompression(size_t bodySize) const |
254 { | |
255 #if 0 | |
256 // TODO Do not compress small files? | |
257 if (bodySize < 512) | |
258 { | |
259 return HttpCompression_None; | |
260 } | |
261 #endif | |
262 | |
263 // Prefer "gzip" over "deflate" if the choice is offered | |
264 | |
265 if (isGzipAllowed_) | |
266 { | |
267 return HttpCompression_Gzip; | |
268 } | |
269 else if (isDeflateAllowed_) | |
270 { | |
271 return HttpCompression_Deflate; | |
272 } | |
273 else | |
274 { | |
275 return HttpCompression_None; | |
276 } | |
277 } | |
278 | |
279 | |
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280 void HttpOutput::SendMethodNotAllowed(const std::string& allowed) |
0 | 281 { |
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282 stateMachine_.ClearHeaders(); |
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283 stateMachine_.SetHttpStatus(HttpStatus_405_MethodNotAllowed); |
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284 stateMachine_.AddHeader("Allow", allowed); |
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285 stateMachine_.SendBody(NULL, 0); |
0 | 286 } |
287 | |
288 | |
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289 void HttpOutput::SendStatus(HttpStatus status) |
0 | 290 { |
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291 if (status == HttpStatus_200_Ok || |
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292 status == HttpStatus_301_MovedPermanently || |
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293 status == HttpStatus_401_Unauthorized || |
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294 status == HttpStatus_405_MethodNotAllowed) |
0 | 295 { |
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296 LOG(ERROR) << "Please use the dedicated methods to this HTTP status code in HttpOutput"; |
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297 throw OrthancException(ErrorCode_ParameterOutOfRange); |
0 | 298 } |
299 | |
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300 stateMachine_.ClearHeaders(); |
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301 stateMachine_.SetHttpStatus(status); |
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302 stateMachine_.SendBody(NULL, 0); |
339 | 303 } |
304 | |
305 | |
0 | 306 void HttpOutput::Redirect(const std::string& path) |
307 { | |
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308 stateMachine_.ClearHeaders(); |
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309 stateMachine_.SetHttpStatus(HttpStatus_301_MovedPermanently); |
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310 stateMachine_.AddHeader("Location", path); |
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311 stateMachine_.SendBody(NULL, 0); |
0 | 312 } |
908
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313 |
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314 |
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315 void HttpOutput::SendUnauthorized(const std::string& realm) |
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316 { |
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317 stateMachine_.ClearHeaders(); |
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318 stateMachine_.SetHttpStatus(HttpStatus_401_Unauthorized); |
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319 stateMachine_.AddHeader("WWW-Authenticate", "Basic realm=\"" + realm + "\""); |
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320 stateMachine_.SendBody(NULL, 0); |
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321 } |
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322 |
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323 void HttpOutput::SendBody(const void* buffer, |
1517 | 324 size_t length) |
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325 { |
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326 if (length == 0) |
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327 { |
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328 stateMachine_.SendBody(NULL, 0); |
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329 } |
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330 else |
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331 { |
1517 | 332 HttpCompression compression = GetPreferredCompression(length); |
333 | |
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334 switch (compression) |
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335 { |
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336 case HttpCompression_None: |
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337 { |
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338 stateMachine_.SendBody(buffer, length); |
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339 break; |
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340 } |
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341 |
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342 case HttpCompression_Gzip: |
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343 case HttpCompression_Deflate: |
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344 { |
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345 std::string compressed, encoding; |
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346 |
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347 if (compression == HttpCompression_Deflate) |
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348 { |
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349 encoding = "deflate"; |
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350 ZlibCompressor compressor; |
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351 // Do not prefix the buffer with its uncompressed size, to be compatible with "deflate" |
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352 compressor.SetPrefixWithUncompressedSize(false); |
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353 compressor.Compress(compressed, buffer, length); |
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354 } |
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355 else |
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356 { |
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357 encoding = "gzip"; |
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358 GzipCompressor compressor; |
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359 compressor.Compress(compressed, buffer, length); |
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360 } |
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361 |
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362 LOG(TRACE) << "Compressing a HTTP answer using " << encoding; |
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363 |
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364 // The body is empty, do not use Deflate compression |
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365 if (compressed.size() == 0) |
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366 { |
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367 stateMachine_.SendBody(NULL, 0); |
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368 } |
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369 else |
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370 { |
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371 stateMachine_.AddHeader("Content-Encoding", encoding); |
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372 stateMachine_.SendBody(compressed.c_str(), compressed.size()); |
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373 } |
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374 |
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375 break; |
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376 } |
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377 |
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378 default: |
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379 throw OrthancException(ErrorCode_NotImplemented); |
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380 } |
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381 } |
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382 } |
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383 |
1517 | 384 void HttpOutput::SendBody(const std::string& str) |
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385 { |
1517 | 386 SendBody(str.size() == 0 ? NULL : str.c_str(), str.size()); |
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387 } |
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388 |
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|
389 void HttpOutput::SendEmptyBody() |
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390 { |
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|
391 stateMachine_.SetContentLength(0); |
1113
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|
392 stateMachine_.SendBody(NULL, 0); |
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|
393 stateMachine_.CloseBody(); |
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394 } |
1430
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|
395 |
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|
396 |
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|
397 void HttpOutput::StateMachine::StartMultipart(const std::string& subType, |
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|
398 const std::string& contentType) |
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399 { |
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|
400 if (subType != "mixed" && |
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401 subType != "related") |
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402 { |
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|
403 throw OrthancException(ErrorCode_ParameterOutOfRange); |
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404 } |
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|
405 |
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|
406 if (keepAlive_) |
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|
407 { |
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|
408 LOG(ERROR) << "Multipart answers are not implemented together with keep-alive connections"; |
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409 throw OrthancException(ErrorCode_NotImplemented); |
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410 } |
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|
411 |
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|
412 if (state_ != State_WritingHeader) |
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413 { |
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|
414 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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415 } |
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416 |
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|
417 if (status_ != HttpStatus_200_Ok) |
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|
418 { |
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419 SendBody(NULL, 0); |
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420 return; |
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421 } |
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422 |
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|
423 stream_.OnHttpStatusReceived(status_); |
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424 |
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|
425 std::string header = "HTTP/1.1 200 OK\r\n"; |
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426 |
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|
427 // Possibly add the cookies |
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428 for (std::list<std::string>::const_iterator |
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429 it = headers_.begin(); it != headers_.end(); ++it) |
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430 { |
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431 if (!Toolbox::StartsWith(*it, "Set-Cookie: ")) |
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432 { |
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433 LOG(ERROR) << "The only headers that can be set in multipart answers are Set-Cookie (here: " << *it << " is set)"; |
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434 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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435 } |
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436 |
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437 header += *it; |
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438 } |
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439 |
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440 multipartBoundary_ = Toolbox::GenerateUuid(); |
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441 multipartContentType_ = contentType; |
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442 header += "Content-Type: multipart/related; type=multipart/" + subType + "; boundary=" + multipartBoundary_ + "\r\n\r\n"; |
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443 |
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444 stream_.Send(true, header.c_str(), header.size()); |
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445 state_ = State_WritingMultipart; |
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446 } |
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447 |
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448 |
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449 void HttpOutput::StateMachine::SendMultipartItem(const void* item, size_t length) |
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450 { |
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451 std::string header = "--" + multipartBoundary_ + "\n"; |
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452 header += "Content-Type: " + multipartContentType_ + "\n"; |
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453 header += "Content-Length: " + boost::lexical_cast<std::string>(length) + "\n"; |
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454 header += "MIME-Version: 1.0\n\n"; |
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455 |
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456 stream_.Send(false, header.c_str(), header.size()); |
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457 |
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458 if (length > 0) |
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459 { |
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460 stream_.Send(false, item, length); |
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461 } |
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462 |
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463 stream_.Send(false, "\n", 1); |
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464 } |
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465 |
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466 |
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467 void HttpOutput::StateMachine::CloseMultipart() |
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468 { |
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469 if (state_ != State_WritingMultipart) |
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470 { |
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471 throw OrthancException(ErrorCode_BadSequenceOfCalls); |
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472 } |
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473 |
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474 // The two lines below might throw an exception, if the client has |
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475 // closed the connection. Such an error is ignored. |
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476 try |
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477 { |
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478 std::string header = "--" + multipartBoundary_ + "--\n"; |
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479 stream_.Send(false, header.c_str(), header.size()); |
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480 } |
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481 catch (OrthancException&) |
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482 { |
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483 } |
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484 |
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485 state_ = State_Done; |
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486 } |
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487 |
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488 |
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489 void HttpOutput::SendMultipartItem(const std::string& item) |
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490 { |
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491 if (item.size() > 0) |
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492 { |
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493 stateMachine_.SendMultipartItem(item.c_str(), item.size()); |
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494 } |
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495 else |
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496 { |
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497 stateMachine_.SendMultipartItem(NULL, 0); |
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498 } |
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499 } |
1519
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500 |
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501 |
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502 void HttpOutput::Answer(IHttpStreamAnswer& stream) |
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503 { |
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504 stateMachine_.SetContentLength(stream.GetContentLength()); |
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505 |
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506 std::string contentType = stream.GetContentType(); |
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507 if (contentType.empty()) |
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508 { |
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509 contentType = "application/octet-stream"; |
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510 } |
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511 |
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512 stateMachine_.SetContentType(contentType.c_str()); |
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513 |
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514 std::string filename; |
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515 if (stream.HasContentFilename(filename)) |
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516 { |
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517 SetContentFilename(filename.c_str()); |
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518 } |
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519 |
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520 HttpCompression compression = stream.GetHttpCompression(isGzipAllowed_, isDeflateAllowed_); |
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521 |
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522 switch (compression) |
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523 { |
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524 case HttpCompression_None: |
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525 break; |
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526 |
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527 case HttpCompression_Gzip: |
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528 stateMachine_.AddHeader("Content-Encoding", "gzip"); |
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529 break; |
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530 |
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531 case HttpCompression_Deflate: |
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532 stateMachine_.AddHeader("Content-Encoding", "deflate"); |
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533 break; |
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534 |
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535 default: |
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536 throw OrthancException(ErrorCode_ParameterOutOfRange); |
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537 } |
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538 |
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539 while (stream.ReadNextChunk()) |
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540 { |
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541 stateMachine_.SendBody(stream.GetChunkContent(), |
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542 stream.GetChunkSize()); |
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543 } |
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|
544 |
8bd0d897763f
refactoring: IHttpStreamAnswer
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
1517
diff
changeset
|
545 stateMachine_.CloseBody(); |
8bd0d897763f
refactoring: IHttpStreamAnswer
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
1517
diff
changeset
|
546 } |
8bd0d897763f
refactoring: IHttpStreamAnswer
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
1517
diff
changeset
|
547 |
0 | 548 } |