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annotate Core/HttpServer/HttpOutput.cpp @ 2763:293659218a6a Orthanc-0.9.3

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 17 Jul 2018 09:41:59 +0200
parents f967bdf8534e
children 7962563129c9
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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
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40 #include <iostream>
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41 #include <vector>
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42 #include <stdio.h>
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43 #include <boost/lexical_cast.hpp>
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45
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46 namespace Orthanc
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47 {
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48 HttpOutput::StateMachine::StateMachine(IHttpOutputStream& stream,
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49 bool isKeepAlive) :
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50 stream_(stream),
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51 state_(State_WritingHeader),
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52 status_(HttpStatus_200_Ok),
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53 hasContentLength_(false),
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54 contentPosition_(0),
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55 keepAlive_(isKeepAlive)
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56 {
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57 }
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58
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59 HttpOutput::StateMachine::~StateMachine()
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60 {
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61 if (state_ != State_Done)
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62 {
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63 //asm volatile ("int3;");
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64 //LOG(ERROR) << "This HTTP answer does not contain any body";
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65 }
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67 if (hasContentLength_ && contentPosition_ != contentLength_)
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68 {
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69 LOG(ERROR) << "This HTTP answer has not sent the proper number of bytes in its body";
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70 }
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71 }
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74 void HttpOutput::StateMachine::SetHttpStatus(HttpStatus status)
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75 {
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76 if (state_ != State_WritingHeader)
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77 {
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78 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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79 }
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80
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81 status_ = status;
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82 }
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85 void HttpOutput::StateMachine::SetContentLength(uint64_t length)
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86 {
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87 if (state_ != State_WritingHeader)
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88 {
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89 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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90 }
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91
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92 hasContentLength_ = true;
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93 contentLength_ = length;
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94 }
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95
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96 void HttpOutput::StateMachine::SetContentType(const char* contentType)
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97 {
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98 AddHeader("Content-Type", contentType);
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99 }
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101 void HttpOutput::StateMachine::SetContentFilename(const char* filename)
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102 {
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103 // TODO Escape double quotes
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104 AddHeader("Content-Disposition", "filename=\"" + std::string(filename) + "\"");
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105 }
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106
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107 void HttpOutput::StateMachine::SetCookie(const std::string& cookie,
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108 const std::string& value)
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109 {
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110 if (state_ != State_WritingHeader)
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111 {
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112 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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113 }
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115 // TODO Escape "=" characters
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116 AddHeader("Set-Cookie", cookie + "=" + value);
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117 }
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120 void HttpOutput::StateMachine::AddHeader(const std::string& header,
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121 const std::string& value)
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122 {
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123 if (state_ != State_WritingHeader)
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124 {
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125 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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126 }
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128 headers_.push_back(header + ": " + value + "\r\n");
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129 }
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130
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131 void HttpOutput::StateMachine::ClearHeaders()
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132 {
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133 if (state_ != State_WritingHeader)
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134 {
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135 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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136 }
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137
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138 headers_.clear();
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139 }
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140
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141 void HttpOutput::StateMachine::SendBody(const void* buffer, size_t length)
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142 {
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143 if (state_ == State_Done)
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144 {
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145 if (length == 0)
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146 {
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147 return;
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148 }
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149 else
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150 {
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151 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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152 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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153 }
910
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154 }
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155
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156 if (state_ == State_WritingMultipart)
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157 {
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158 throw OrthancException(ErrorCode_InternalError);
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159 }
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160
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161 if (state_ == State_WritingHeader)
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162 {
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163 // Send the HTTP header before writing the body
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164
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165 stream_.OnHttpStatusReceived(status_);
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166
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167 std::string s = "HTTP/1.1 " +
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168 boost::lexical_cast<std::string>(status_) +
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169 " " + std::string(EnumerationToString(status_)) +
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170 "\r\n";
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171
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172 if (keepAlive_)
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173 {
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174 s += "Connection: keep-alive\r\n";
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175 }
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176
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177 for (std::list<std::string>::const_iterator
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178 it = headers_.begin(); it != headers_.end(); ++it)
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179 {
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180 s += *it;
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181 }
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182
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183 if (status_ != HttpStatus_200_Ok)
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184 {
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185 hasContentLength_ = false;
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186 }
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187
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188 uint64_t contentLength = (hasContentLength_ ? contentLength_ : length);
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189 s += "Content-Length: " + boost::lexical_cast<std::string>(contentLength) + "\r\n\r\n";
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190
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191 stream_.Send(true, s.c_str(), s.size());
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192 state_ = State_WritingBody;
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193 }
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194
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195 if (hasContentLength_ &&
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196 contentPosition_ + length > contentLength_)
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197 {
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198 LOG(ERROR) << "The body size exceeds what was declared with SetContentSize()";
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199 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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200 }
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201
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202 if (length > 0)
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203 {
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204 stream_.Send(false, buffer, length);
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205 contentPosition_ += length;
330
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206 }
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207
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208 if (!hasContentLength_ ||
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209 contentPosition_ == contentLength_)
330
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210 {
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211 state_ = State_Done;
330
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212 }
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213 }
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214
207
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215
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216 void HttpOutput::SendMethodNotAllowed(const std::string& allowed)
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217 {
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218 stateMachine_.ClearHeaders();
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219 stateMachine_.SetHttpStatus(HttpStatus_405_MethodNotAllowed);
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220 stateMachine_.AddHeader("Allow", allowed);
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221 stateMachine_.SendBody(NULL, 0);
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222 }
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223
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224
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225 void HttpOutput::SendStatus(HttpStatus status)
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226 {
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227 if (status == HttpStatus_200_Ok ||
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228 status == HttpStatus_301_MovedPermanently ||
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229 status == HttpStatus_401_Unauthorized ||
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230 status == HttpStatus_405_MethodNotAllowed)
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231 {
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232 LOG(ERROR) << "Please use the dedicated methods to this HTTP status code in HttpOutput";
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233 throw OrthancException(ErrorCode_ParameterOutOfRange);
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234 }
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235
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236 stateMachine_.ClearHeaders();
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237 stateMachine_.SetHttpStatus(status);
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238 stateMachine_.SendBody(NULL, 0);
339
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239 }
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240
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241
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242 void HttpOutput::Redirect(const std::string& path)
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243 {
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244 stateMachine_.ClearHeaders();
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245 stateMachine_.SetHttpStatus(HttpStatus_301_MovedPermanently);
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246 stateMachine_.AddHeader("Location", path);
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247 stateMachine_.SendBody(NULL, 0);
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248 }
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249
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250
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251 void HttpOutput::SendUnauthorized(const std::string& realm)
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252 {
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253 stateMachine_.ClearHeaders();
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254 stateMachine_.SetHttpStatus(HttpStatus_401_Unauthorized);
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255 stateMachine_.AddHeader("WWW-Authenticate", "Basic realm=\"" + realm + "\"");
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256 stateMachine_.SendBody(NULL, 0);
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257 }
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258
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259 void HttpOutput::SendBody(const void* buffer, size_t length)
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260 {
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261 stateMachine_.SendBody(buffer, length);
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262 }
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263
1113
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264 void HttpOutput::SendBody(const std::string& str)
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265 {
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266 if (str.size() == 0)
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267 {
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268 stateMachine_.SendBody(NULL, 0);
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269 }
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270 else
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271 {
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272 stateMachine_.SendBody(str.c_str(), str.size());
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273 }
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274 }
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275
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276 void HttpOutput::SendBody()
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277 {
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278 stateMachine_.SendBody(NULL, 0);
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279 }
1430
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280
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281
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282 void HttpOutput::StateMachine::StartMultipart(const std::string& subType,
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283 const std::string& contentType)
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284 {
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285 if (subType != "mixed" &&
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286 subType != "related")
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287 {
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288 throw OrthancException(ErrorCode_ParameterOutOfRange);
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289 }
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290
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291 if (keepAlive_)
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292 {
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293 LOG(ERROR) << "Multipart answers are not implemented together with keep-alive connections";
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294 throw OrthancException(ErrorCode_NotImplemented);
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295 }
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296
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297 if (state_ != State_WritingHeader)
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298 {
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299 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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300 }
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301
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302 if (status_ != HttpStatus_200_Ok)
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303 {
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304 SendBody(NULL, 0);
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305 return;
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306 }
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307
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308 stream_.OnHttpStatusReceived(status_);
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309
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310 std::string header = "HTTP/1.1 200 OK\r\n";
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311
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312 // Possibly add the cookies
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313 for (std::list<std::string>::const_iterator
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314 it = headers_.begin(); it != headers_.end(); ++it)
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315 {
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316 if (!Toolbox::StartsWith(*it, "Set-Cookie: "))
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317 {
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318 LOG(ERROR) << "The only headers that can be set in multipart answers are Set-Cookie (here: " << *it << " is set)";
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319 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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320 }
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321
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322 header += *it;
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323 }
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324
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325 multipartBoundary_ = Toolbox::GenerateUuid();
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326 multipartContentType_ = contentType;
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327 header += "Content-Type: multipart/related; type=multipart/" + subType + "; boundary=" + multipartBoundary_ + "\r\n\r\n";
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328
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329 stream_.Send(true, header.c_str(), header.size());
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330 state_ = State_WritingMultipart;
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331 }
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332
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333
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334 void HttpOutput::StateMachine::SendMultipartItem(const void* item, size_t length)
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335 {
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336 std::string header = "--" + multipartBoundary_ + "\n";
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337 header += "Content-Type: " + multipartContentType_ + "\n";
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338 header += "Content-Length: " + boost::lexical_cast<std::string>(length) + "\n";
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339 header += "MIME-Version: 1.0\n\n";
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340
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341 stream_.Send(false, header.c_str(), header.size());
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342
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343 if (length > 0)
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344 {
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345 stream_.Send(false, item, length);
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346 }
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347
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348 stream_.Send(false, "\n", 1);
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349 }
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350
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351
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352 void HttpOutput::StateMachine::CloseMultipart()
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353 {
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354 if (state_ != State_WritingMultipart)
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355 {
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356 throw OrthancException(ErrorCode_BadSequenceOfCalls);
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357 }
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358
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359 // The two lines below might throw an exception, if the client has
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360 // closed the connection. Such an error is ignored.
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361 try
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362 {
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363 std::string header = "--" + multipartBoundary_ + "--\n";
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364 stream_.Send(false, header.c_str(), header.size());
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365 }
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366 catch (OrthancException&)
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367 {
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368 }
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369
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370 state_ = State_Done;
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371 }
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372
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373
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374 void HttpOutput::SendMultipartItem(const std::string& item)
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375 {
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376 if (item.size() > 0)
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377 {
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378 stateMachine_.SendMultipartItem(item.c_str(), item.size());
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379 }
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380 else
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381 {
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382 stateMachine_.SendMultipartItem(NULL, 0);
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383 }
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384 }
0
3959d33612cc initial commit
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diff changeset
385 }