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annotate Core/HttpServer/HttpOutput.cpp @ 1517:4f8c8ef114db

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Aug 2015 10:32:34 +0200
parents d73a2178b319
children 8bd0d897763f
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1 /**
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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
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "HttpOutput.h"
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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
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42 #include <iostream>
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43 #include <vector>
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44 #include <stdio.h>
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45 #include <boost/lexical_cast.hpp>
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47
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48 namespace Orthanc
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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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61 HttpOutput::StateMachine::~StateMachine()
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62 {
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63 if (state_ != State_Done)
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64 {
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65 //asm volatile ("int3;");
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66 //LOG(ERROR) << "This HTTP answer does not contain any body";
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67 }
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69 if (hasContentLength_ && contentPosition_ != contentLength_)
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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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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);
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81 }
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82
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83 status_ = status;
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84 }
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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 }
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93
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94 hasContentLength_ = true;
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95 contentLength_ = length;
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96 }
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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) + "\"");
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107 }
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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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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()
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134 {
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135 if (state_ != State_WritingHeader)
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136 {
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137 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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138 }
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139
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140 headers_.clear();
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141 }
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142
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143 void HttpOutput::StateMachine::SendBody(const void* buffer, size_t length)
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144 {
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145 if (state_ == State_Done)
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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
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156 }
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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
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163 if (state_ == State_WritingHeader)
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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());
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194 state_ = State_WritingBody;
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195 }
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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
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204 if (length > 0)
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205 {
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206 stream_.Send(false, buffer, length);
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207 contentPosition_ += length;
330
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208 }
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209
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210 if (!hasContentLength_ ||
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211 contentPosition_ == contentLength_)
330
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212 {
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213 state_ = State_Done;
330
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214 }
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215 }
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216
207
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217
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218 HttpCompression HttpOutput::GetPreferredCompression(size_t bodySize) const
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219 {
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220 #if 0
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221 // TODO Do not compress small files?
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222 if (bodySize < 512)
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223 {
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224 return HttpCompression_None;
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225 }
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226 #endif
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227
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228 // Prefer "gzip" over "deflate" if the choice is offered
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229
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230 if (isGzipAllowed_)
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231 {
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232 return HttpCompression_Gzip;
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233 }
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234 else if (isDeflateAllowed_)
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235 {
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236 return HttpCompression_Deflate;
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237 }
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238 else
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239 {
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240 return HttpCompression_None;
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241 }
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242 }
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243
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244
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245 void HttpOutput::SendMethodNotAllowed(const std::string& allowed)
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246 {
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247 stateMachine_.ClearHeaders();
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248 stateMachine_.SetHttpStatus(HttpStatus_405_MethodNotAllowed);
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249 stateMachine_.AddHeader("Allow", allowed);
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250 stateMachine_.SendBody(NULL, 0);
0
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251 }
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252
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253
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254 void HttpOutput::SendStatus(HttpStatus status)
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255 {
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256 if (status == HttpStatus_200_Ok ||
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257 status == HttpStatus_301_MovedPermanently ||
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258 status == HttpStatus_401_Unauthorized ||
473
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diff changeset
259 status == HttpStatus_405_MethodNotAllowed)
0
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260 {
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261 LOG(ERROR) << "Please use the dedicated methods to this HTTP status code in HttpOutput";
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262 throw OrthancException(ErrorCode_ParameterOutOfRange);
0
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263 }
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264
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265 stateMachine_.ClearHeaders();
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266 stateMachine_.SetHttpStatus(status);
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267 stateMachine_.SendBody(NULL, 0);
339
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268 }
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269
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270
0
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271 void HttpOutput::Redirect(const std::string& path)
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272 {
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273 stateMachine_.ClearHeaders();
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274 stateMachine_.SetHttpStatus(HttpStatus_301_MovedPermanently);
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275 stateMachine_.AddHeader("Location", path);
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276 stateMachine_.SendBody(NULL, 0);
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277 }
908
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278
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279
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280 void HttpOutput::SendUnauthorized(const std::string& realm)
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281 {
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282 stateMachine_.ClearHeaders();
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283 stateMachine_.SetHttpStatus(HttpStatus_401_Unauthorized);
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284 stateMachine_.AddHeader("WWW-Authenticate", "Basic realm=\"" + realm + "\"");
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285 stateMachine_.SendBody(NULL, 0);
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286 }
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287
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288 void HttpOutput::SendBody(const void* buffer,
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289 size_t length)
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290 {
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291 if (length == 0)
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292 {
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293 stateMachine_.SendBody(NULL, 0);
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294 }
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295 else
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296 {
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297 HttpCompression compression = GetPreferredCompression(length);
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298
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299 switch (compression)
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300 {
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301 case HttpCompression_None:
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302 {
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303 stateMachine_.SendBody(buffer, length);
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304 break;
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305 }
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306
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307 case HttpCompression_Gzip:
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308 case HttpCompression_Deflate:
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309 {
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310 std::string compressed, encoding;
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311
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312 if (compression == HttpCompression_Deflate)
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313 {
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314 encoding = "deflate";
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315 ZlibCompressor compressor;
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316 // Do not prefix the buffer with its uncompressed size, to be compatible with "deflate"
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317 compressor.SetPrefixWithUncompressedSize(false);
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318 compressor.Compress(compressed, buffer, length);
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319 }
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320 else
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321 {
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322 encoding = "gzip";
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323 GzipCompressor compressor;
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diff changeset
324 compressor.Compress(compressed, buffer, length);
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325 }
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326
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327 LOG(TRACE) << "Compressing a HTTP answer using " << encoding;
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diff changeset
328
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329 // The body is empty, do not use Deflate compression
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330 if (compressed.size() == 0)
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331 {
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332 stateMachine_.SendBody(NULL, 0);
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333 }
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diff changeset
334 else
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diff changeset
335 {
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diff changeset
336 stateMachine_.AddHeader("Content-Encoding", encoding);
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337 stateMachine_.SendBody(compressed.c_str(), compressed.size());
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diff changeset
338 }
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diff changeset
339
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diff changeset
340 break;
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diff changeset
341 }
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diff changeset
342
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343 default:
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344 throw OrthancException(ErrorCode_NotImplemented);
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diff changeset
345 }
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diff changeset
346 }
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diff changeset
347 }
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diff changeset
348
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diff changeset
349 void HttpOutput::SendBody(const std::string& str)
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diff changeset
350 {
1517
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diff changeset
351 SendBody(str.size() == 0 ? NULL : str.c_str(), str.size());
1511
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diff changeset
352 }
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diff changeset
353
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diff changeset
354 void HttpOutput::SendBody()
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diff changeset
355 {
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diff changeset
356 stateMachine_.SendBody(NULL, 0);
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diff changeset
357 }
1430
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diff changeset
358
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diff changeset
359
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
360 void HttpOutput::StateMachine::StartMultipart(const std::string& subType,
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
361 const std::string& contentType)
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diff changeset
362 {
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diff changeset
363 if (subType != "mixed" &&
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
364 subType != "related")
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
365 {
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
366 throw OrthancException(ErrorCode_ParameterOutOfRange);
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
367 }
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diff changeset
368
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
369 if (keepAlive_)
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diff changeset
370 {
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
371 LOG(ERROR) << "Multipart answers are not implemented together with keep-alive connections";
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diff changeset
372 throw OrthancException(ErrorCode_NotImplemented);
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diff changeset
373 }
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parents: 1288
diff changeset
374
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
375 if (state_ != State_WritingHeader)
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diff changeset
376 {
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
377 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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diff changeset
378 }
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diff changeset
379
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
380 if (status_ != HttpStatus_200_Ok)
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diff changeset
381 {
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diff changeset
382 SendBody(NULL, 0);
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
383 return;
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
384 }
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
385
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
386 stream_.OnHttpStatusReceived(status_);
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diff changeset
387
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
388 std::string header = "HTTP/1.1 200 OK\r\n";
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
389
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
390 // Possibly add the cookies
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diff changeset
391 for (std::list<std::string>::const_iterator
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diff changeset
392 it = headers_.begin(); it != headers_.end(); ++it)
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
393 {
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
394 if (!Toolbox::StartsWith(*it, "Set-Cookie: "))
ad94a3583b07 Plugins can send answers as multipart messages
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
395 {
ad94a3583b07 Plugins can send answers as multipart messages
Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
396 LOG(ERROR) << "The only headers that can be set in multipart answers are Set-Cookie (here: " << *it << " is set)";
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
397 throw OrthancException(ErrorCode_BadSequenceOfCalls);
ad94a3583b07 Plugins can send answers as multipart messages
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diff changeset
398 }
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399
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400 header += *it;
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401 }
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402
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403 multipartBoundary_ = Toolbox::GenerateUuid();
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404 multipartContentType_ = contentType;
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405 header += "Content-Type: multipart/related; type=multipart/" + subType + "; boundary=" + multipartBoundary_ + "\r\n\r\n";
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406
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407 stream_.Send(true, header.c_str(), header.size());
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408 state_ = State_WritingMultipart;
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409 }
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410
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411
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412 void HttpOutput::StateMachine::SendMultipartItem(const void* item, size_t length)
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413 {
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414 std::string header = "--" + multipartBoundary_ + "\n";
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415 header += "Content-Type: " + multipartContentType_ + "\n";
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416 header += "Content-Length: " + boost::lexical_cast<std::string>(length) + "\n";
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417 header += "MIME-Version: 1.0\n\n";
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418
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419 stream_.Send(false, header.c_str(), header.size());
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420
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421 if (length > 0)
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422 {
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423 stream_.Send(false, item, length);
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424 }
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425
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426 stream_.Send(false, "\n", 1);
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427 }
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428
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429
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430 void HttpOutput::StateMachine::CloseMultipart()
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431 {
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432 if (state_ != State_WritingMultipart)
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433 {
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434 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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435 }
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436
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437 // The two lines below might throw an exception, if the client has
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438 // closed the connection. Such an error is ignored.
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439 try
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440 {
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441 std::string header = "--" + multipartBoundary_ + "--\n";
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442 stream_.Send(false, header.c_str(), header.size());
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443 }
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444 catch (OrthancException&)
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445 {
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446 }
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447
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448 state_ = State_Done;
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449 }
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450
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451
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452 void HttpOutput::SendMultipartItem(const std::string& item)
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453 {
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454 if (item.size() > 0)
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455 {
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456 stateMachine_.SendMultipartItem(item.c_str(), item.size());
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457 }
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458 else
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459 {
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460 stateMachine_.SendMultipartItem(NULL, 0);
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461 }
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462 }
0
3959d33612cc initial commit
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463 }