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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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31
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32
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33 #include "PrecompiledHeaders.h"
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34 #include "HttpClient.h"
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35
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36 #include "Toolbox.h"
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37 #include "OrthancException.h"
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38
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39 #include <string.h>
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40 #include <curl/curl.h>
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41
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42
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43 namespace Orthanc
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44 {
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45 struct HttpClient::PImpl
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46 {
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47 CURL* curl_;
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48 struct curl_slist *postHeaders_;
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49 };
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50
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51
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52 static CURLcode CheckCode(CURLcode code)
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53 {
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54 if (code != CURLE_OK)
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55 {
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56 throw OrthancException("libCURL error: " + std::string(curl_easy_strerror(code)));
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57 }
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58
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59 return code;
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60 }
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61
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62
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63 static size_t CurlCallback(void *buffer, size_t size, size_t nmemb, void *payload)
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64 {
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65 std::string& target = *(static_cast<std::string*>(payload));
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66
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67 size_t length = size * nmemb;
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68 if (length == 0)
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69 return 0;
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70
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71 size_t pos = target.size();
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72
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73 target.resize(pos + length);
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74 memcpy(&target.at(pos), buffer, length);
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75
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76 return length;
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77 }
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78
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79
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80 void HttpClient::Setup()
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81 {
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82 pimpl_->postHeaders_ = NULL;
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83 if ((pimpl_->postHeaders_ = curl_slist_append(pimpl_->postHeaders_, "Expect:")) == NULL)
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84 {
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85 throw OrthancException(ErrorCode_NotEnoughMemory);
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86 }
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87
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88 pimpl_->curl_ = curl_easy_init();
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89 if (!pimpl_->curl_)
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90 {
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91 curl_slist_free_all(pimpl_->postHeaders_);
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92 throw OrthancException(ErrorCode_NotEnoughMemory);
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93 }
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94
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95 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_WRITEFUNCTION, &CurlCallback));
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96 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HEADER, 0));
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97 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_FOLLOWLOCATION, 1));
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98
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99 #if ORTHANC_SSL_ENABLED == 1
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100 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_SSL_VERIFYPEER, 0));
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101 #endif
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102
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103 // This fixes the "longjmp causes uninitialized stack frame" crash
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104 // that happens on modern Linux versions.
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105 // http://stackoverflow.com/questions/9191668/error-longjmp-causes-uninitialized-stack-frame
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106 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_NOSIGNAL, 1));
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107
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108 url_ = "";
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109 method_ = HttpMethod_Get;
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110 lastStatus_ = HttpStatus_200_Ok;
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111 isVerbose_ = false;
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112 timeout_ = 0;
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113 }
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114
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115
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116 HttpClient::HttpClient() : pimpl_(new PImpl)
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117 {
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118 Setup();
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119 }
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120
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121
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122 HttpClient::HttpClient(const HttpClient& other) : pimpl_(new PImpl)
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123 {
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124 Setup();
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125
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126 if (other.IsVerbose())
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127 {
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128 SetVerbose(true);
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129 }
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130
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131 if (other.credentials_.size() != 0)
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132 {
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133 credentials_ = other.credentials_;
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134 }
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135 }
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136
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137
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138 HttpClient::~HttpClient()
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139 {
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140 curl_easy_cleanup(pimpl_->curl_);
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141 curl_slist_free_all(pimpl_->postHeaders_);
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142 }
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143
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144
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145 void HttpClient::SetVerbose(bool isVerbose)
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146 {
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147 isVerbose_ = isVerbose;
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148
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149 if (isVerbose_)
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150 {
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151 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_VERBOSE, 1));
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152 }
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153 else
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154 {
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155 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_VERBOSE, 0));
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156 }
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157 }
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158
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159
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160 bool HttpClient::Apply(std::string& answer)
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161 {
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162 answer.clear();
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163 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_URL, url_.c_str()));
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164 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_WRITEDATA, &answer));
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165
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166 // Reset the parameters from previous calls to Apply()
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167 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, NULL));
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168 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPGET, 0L));
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169 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POST, 0L));
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170 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_NOBODY, 0L));
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171 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CUSTOMREQUEST, NULL));
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172 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, NULL));
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173 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, 0));
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174 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_PROXY, NULL));
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175
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176 // Set timeouts
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177 if (timeout_ <= 0)
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178 {
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179 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_TIMEOUT, 10)); /* default: 10 seconds */
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180 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CONNECTTIMEOUT, 10)); /* default: 10 seconds */
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181 }
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182 else
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183 {
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184 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_TIMEOUT, timeout_));
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185 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CONNECTTIMEOUT, timeout_));
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186 }
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187
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188 if (credentials_.size() != 0)
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189 {
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190 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_USERPWD, credentials_.c_str()));
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191 }
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192
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193 if (proxy_.size() != 0)
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194 {
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195 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_PROXY, proxy_.c_str()));
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196 }
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197
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198 switch (method_)
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199 {
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200 case HttpMethod_Get:
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201 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPGET, 1L));
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202 break;
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203
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204 case HttpMethod_Post:
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205 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POST, 1L));
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206 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, pimpl_->postHeaders_));
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207 break;
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208
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209 case HttpMethod_Delete:
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210 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_NOBODY, 1L));
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211 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CUSTOMREQUEST, "DELETE"));
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212 break;
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213
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214 case HttpMethod_Put:
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215 // http://stackoverflow.com/a/7570281/881731: Don't use
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216 // CURLOPT_PUT if there is a body
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217
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218 // CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_PUT, 1L));
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219
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220 curl_easy_setopt(pimpl_->curl_, CURLOPT_CUSTOMREQUEST, "PUT"); /* !!! */
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221 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, pimpl_->postHeaders_));
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222 break;
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223
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224 default:
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225 throw OrthancException(ErrorCode_InternalError);
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226 }
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227
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228
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229 if (method_ == HttpMethod_Post ||
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230 method_ == HttpMethod_Put)
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231 {
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232 if (postData_.size() > 0)
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233 {
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234 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, postData_.c_str()));
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235 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, postData_.size()));
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236 }
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237 else
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238 {
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239 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, NULL));
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240 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, 0));
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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 // Do the actual request
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246 CheckCode(curl_easy_perform(pimpl_->curl_));
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247
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248 long status;
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249 CheckCode(curl_easy_getinfo(pimpl_->curl_, CURLINFO_RESPONSE_CODE, &status));
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250
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251 if (status == 0)
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252 {
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253 // This corresponds to a call to an inexistent host
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254 lastStatus_ = HttpStatus_500_InternalServerError;
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255 }
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256 else
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257 {
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258 lastStatus_ = static_cast<HttpStatus>(status);
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259 }
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260
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261 return (status >= 200 && status < 300);
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262 }
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263
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264
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265 bool HttpClient::Apply(Json::Value& answer)
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266 {
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267 std::string s;
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268 if (Apply(s))
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269 {
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270 Json::Reader reader;
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271 return reader.parse(s, answer);
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272 }
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273 else
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274 {
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275 return false;
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276 }
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277 }
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278
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279
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280 void HttpClient::SetCredentials(const char* username,
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281 const char* password)
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282 {
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283 credentials_ = std::string(username) + ":" + std::string(password);
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284 }
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285
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286
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287 void HttpClient::GlobalInitialize()
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288 {
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289 CheckCode(curl_global_init(CURL_GLOBAL_DEFAULT));
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290 }
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291
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292 void HttpClient::GlobalFinalize()
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293 {
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294 curl_global_cleanup();
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295 }
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296 }
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