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1 /**
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2 * Palantir - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
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4 * Belgium
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5 *
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6 * Permission is hereby granted, free of charge, to any person
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7 * obtaining a copy of this software and associated documentation
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8 * files (the "Software"), to deal in the Software without
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9 * restriction, including without limitation the rights to use, copy,
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10 * modify, merge, publish, distribute, sublicense, and/or sell copies
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11 * of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be
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15 * included in all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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21 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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22 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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24 * SOFTWARE.
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25 **/
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26
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27
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28 #include "HttpClient.h"
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29
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30 #include <string.h>
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31 #include <curl/curl.h>
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32
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33
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34 namespace Palantir
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35 {
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36 struct HttpClient::PImpl
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37 {
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38 CURL* curl_;
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39 struct curl_slist *postHeaders_;
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40 };
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41
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42
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43 static CURLcode CheckCode(CURLcode code)
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44 {
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45 if (code != CURLE_OK)
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46 {
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47 throw HttpException("CURL: " + std::string(curl_easy_strerror(code)));
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48 }
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49
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50 return code;
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51 }
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52
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53
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54 static size_t CurlCallback(void *buffer, size_t size, size_t nmemb, void *payload)
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55 {
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56 std::string& target = *(static_cast<std::string*>(payload));
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57
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58 size_t length = size * nmemb;
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59 if (length == 0)
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60 return 0;
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61
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62 size_t pos = target.size();
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63
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64 target.resize(pos + length);
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65 memcpy(&target.at(pos), buffer, length);
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66
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67 return length;
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68 }
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69
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70
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71 HttpClient::HttpClient() : pimpl_(new PImpl)
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72 {
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73 pimpl_->postHeaders_ = NULL;
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74 if ((pimpl_->postHeaders_ = curl_slist_append(pimpl_->postHeaders_, "Expect:")) == NULL)
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75 {
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76 throw HttpException("HttpClient: Not enough memory");
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77 }
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78
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79 pimpl_->curl_ = curl_easy_init();
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80 if (!pimpl_->curl_)
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81 {
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82 curl_slist_free_all(pimpl_->postHeaders_);
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83 throw HttpException("HttpClient: Not enough memory");
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84 }
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85
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86 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_WRITEFUNCTION, &CurlCallback));
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87 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HEADER, 0));
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88 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_FOLLOWLOCATION, 1));
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89
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90 url_ = "";
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91 method_ = HttpMethod_Get;
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92 lastStatus_ = HttpStatus_200_Ok;
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93 isVerbose_ = false;
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94 }
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95
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96
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97 HttpClient::~HttpClient()
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98 {
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99 curl_easy_cleanup(pimpl_->curl_);
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100 curl_slist_free_all(pimpl_->postHeaders_);
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101 }
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102
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103
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104 void HttpClient::SetVerbose(bool isVerbose)
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105 {
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106 isVerbose_ = isVerbose;
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107
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108 if (isVerbose_)
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109 {
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110 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_VERBOSE, 1));
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111 }
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112 else
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113 {
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114 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_VERBOSE, 0));
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115 }
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116 }
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117
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118
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119 bool HttpClient::Apply(std::string& answer)
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120 {
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121 answer.clear();
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122 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_URL, url_.c_str()));
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123 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_WRITEDATA, &answer));
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124 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, NULL));
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125
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126 switch (method_)
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127 {
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128 case HttpMethod_Get:
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129 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPGET, 1L));
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130 break;
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131
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132 case HttpMethod_Post:
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133 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POST, 1L));
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134 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_HTTPHEADER, pimpl_->postHeaders_));
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135
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136 if (postData_.size() > 0)
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137 {
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138 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, postData_.c_str()));
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139 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, postData_.size()));
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140 }
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141 else
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142 {
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143 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDS, NULL));
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144 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_POSTFIELDSIZE, 0));
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145 }
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146
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147 break;
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148
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149 case HttpMethod_Delete:
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150 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_NOBODY, 1L));
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151 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_CUSTOMREQUEST, "DELETE"));
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152 break;
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153
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154 case HttpMethod_Put:
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155 CheckCode(curl_easy_setopt(pimpl_->curl_, CURLOPT_PUT, 1L));
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156 break;
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157
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158 default:
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159 throw HttpException("HttpClient: Internal error");
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160 }
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161
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162 // Do the actual request
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163 CheckCode(curl_easy_perform(pimpl_->curl_));
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164
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165 long status;
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166 CheckCode(curl_easy_getinfo(pimpl_->curl_, CURLINFO_RESPONSE_CODE, &status));
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167
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168 if (status == 0)
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169 {
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170 // This corresponds to a call to an inexistent host
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171 lastStatus_ = HttpStatus_500_InternalServerError;
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172 }
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173 else
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174 {
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175 lastStatus_ = static_cast<HttpStatus>(status);
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176 }
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177
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178 return (status >= 200 && status < 300);
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179 }
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180
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181
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182 bool HttpClient::Apply(Json::Value& answer)
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183 {
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184 std::string s;
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185 if (Apply(s))
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186 {
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187 Json::Reader reader;
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188 return reader.parse(s, answer);
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189 }
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190 else
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191 {
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192 return false;
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193 }
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194 }
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195 }
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