Added initial CurlConnection class in anticipation of downloading motor data from ThrustCurve.org

CMakeLists.txt

@@ -25,6 +25,7 @@ enable_testing()
 
 add_subdirectory(src/gui)
 add_subdirectory(src/sim)
+add_subdirectory(src/Utils)
 
 #find_package(wxWidgets REQUIRED gl core base)
 #include(${wxWidgets_USE_FILE})

src/Utils/CMakeLists.txt

@@ -0,0 +1,6 @@
+find_package(CURL)
+
+add_library(utils
+   CurlConnection.cpp)
+
+target_link_libraries(utils curl jsoncpp ssl crypto) 

src/Utils/CurlConnection.cpp

@@ -0,0 +1,71 @@
+#include "CurlConnection.h"
+
+#include <vector>
+#include <iostream>
+
+#include <time.h>
+
+#include <curl/curl.h>
+
+namespace
+{
+   size_t curlCallback(void* content, size_t size, size_t nmemb, std::string* buffer)
+{
+   buffer->append(static_cast<char*>(content), size*nmemb);
+   return size*nmemb;
+}
+}
+
+namespace Utils
+{
+
+CurlConnection::CurlConnection()
+{
+   curl_global_init(CURL_GLOBAL_ALL);
+   curl = curl_easy_init();
+}
+
+std::string CurlConnection::get(const std::string& url,
+                                const std::vector<std::string>& extraHttpHeaders)
+{
+   std::string str_result;
+   std::string post_data = "";
+   std::string action = "GET";
+   if(curl)
+   {
+      curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
+      curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curlCallback);
+      curl_easy_setopt(curl, CURLOPT_WRITEDATA, &str_result);
+      curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
+      curl_easy_setopt(curl, CURLOPT_ENCODING, "gzip");
+
+      if(!extraHttpHeaders.empty())
+      {
+         struct curl_slist *chunk = NULL;
+         for(int i = 0; i < extraHttpHeaders.size(); ++i)
+         {
+            chunk = curl_slist_append(chunk, extraHttpHeaders[i].c_str());
+         }
+         curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
+      }
+
+      if(post_data.size() > 0 || action == "POST" || action == "PUT" || action == "DELETE")
+      {
+         if(action == "PUT" || action == "DELETE")
+         {
+            curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, action.c_str());
+         }
+         curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post_data.c_str());
+      }
+      res = curl_easy_perform(curl);
+
+      if(res != CURLE_OK)
+      {
+         std::cout << "There was an error: " << curl_easy_strerror(res) << "\n";
+      }
+   }
+
+   return str_result;
+}
+
+} // namespace Utils

src/Utils/CurlConnection.h

@@ -0,0 +1,29 @@
+#ifndef _APPRESETAPI_H_
+#define _APPRESETAPI_H_
+
+#include <string>
+#include <curl/curl.h>
+#include <vector>
+
+namespace Utils
+{
+
+class CurlConnection
+{
+public:
+   CurlConnection();
+
+   std::string get(const std::string& url, const std::vector<std::string>& extraHttpHeaders);
+
+
+private:
+   CURL* curl;
+   CURLcode res;
+
+};
+
+void initCurl(const std::string& host);
+
+} // namespace utils
+
+#endif // _APPRESETAPI_H_