Add curl initialization.

include/instance.hpp

@@ -17,6 +17,8 @@
 #ifndef MASTODONPP_INSTANCE_HPP
 #define MASTODONPP_INSTANCE_HPP
 
+#include <curl/curl.h>
+
 #include <string>
 
 namespace mastodonpp
@@ -41,10 +43,30 @@ public:
      *  @since  0.1.0
      */
     explicit Instance(string instance, string access_token);
+    ~Instance();
 
 private:
     const string _instance;
     string _access_token;
+    CURL *_connection;
+    char _curl_buffer_error[CURL_ERROR_SIZE];
+    string _curl_buffer;
+
+
+    /*!
+     *  @brief  libcurl write callback function.
+     *
+     *  @since  0.1.0
+     */
+    static int writer(char *data, size_t size, size_t nmemb,
+                      string *writerData);
+
+    /*!
+     *  @brief  Setup libcurl connection.
+     *
+     *  @since  0.1.0
+     */
+    void setup_curl();
 };
 
 } // namespace mastodonpp

src/CMakeLists.txt

@@ -1,5 +1,7 @@
 include(GNUInstallDirs)
 
+find_package(CURL REQUIRED)
+
 # Write version in header.
 configure_file ("version.hpp.in"
   "${PROJECT_BINARY_DIR}/version.hpp" @ONLY)
@@ -22,9 +24,8 @@ target_include_directories(${PROJECT_NAME}
   "$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>"
   "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>")
 
-# target_link_libraries(${PROJECT_NAME}
-#   PRIVATE
-#   PUBLIC)
+target_link_libraries(${PROJECT_NAME}
+  PRIVATE CURL::libcurl)
 
 
 install(TARGETS ${PROJECT_NAME}

src/instance.cpp

@@ -15,6 +15,7 @@
  */
 
 #include "instance.hpp"
+#include "exceptions.hpp"
 
 #include <utility>
 
@@ -26,6 +27,53 @@ using std::move;
 Instance::Instance(string instance, string access_token)
     : _instance{move(instance)}
     , _access_token{move(access_token)}
-{}
+    , _connection{curl_easy_init()}
+{
+    setup_curl();
+}
+Instance::~Instance()
+{
+    curl_easy_cleanup(_connection);
+}
+
+int Instance::writer(char *data, size_t size, size_t nmemb, string *writerData)
+{
+    if(writerData == nullptr)
+    {
+        return 0;
+    }
+
+    writerData->append(data, size*nmemb);
+
+    return static_cast<int>(size * nmemb);
+}
+
+void Instance::setup_curl()
+{
+    if (_connection == nullptr)
+    {
+        throw CURLException{CURLE_FAILED_INIT, "Failed to initialize curl."};
+    }
+
+    CURLcode code{curl_easy_setopt(_connection, CURLOPT_ERRORBUFFER,
+                                   _curl_buffer_error)};
+    if (code != CURLE_OK)
+    {
+        throw CURLException{code, "Failed to set error buffer."};
+    }
+
+    code = curl_easy_setopt(_connection, CURLOPT_WRITEFUNCTION, writer);
+    if (code != CURLE_OK)
+    {
+        throw CURLException{code, "Failed to set writer", _curl_buffer_error};
+    }
+
+    code = curl_easy_setopt(_connection, CURLOPT_WRITEDATA, &_curl_buffer);
+    if (code != CURLE_OK)
+    {
+        throw CURLException{code, "Failed to set write data",
+                _curl_buffer_error};
+    }
+}
 
 } // namespace mastodonpp