[WIP] New addon: EasyCurl

include/kafka/addons/EasyCurl.h

@@ -0,0 +1,178 @@
+#pragma once
+
+#include <kafka/Project.h>
+
+#include <curl/curl.h>
+
+#include <chrono>
+#include <memory>
+#include <string>
+#include <vector>
+
+
+namespace KAFKA_API {
+
+class EasyCurlPostRequest
+{
+public:
+    EasyCurlPostRequest(const std::string& url)
+        : _handle(curl_easy_init()),
+          _headerList(new (curl_slist*)(nullptr))
+    {
+        setUrl(url);
+    }
+
+    EasyCurlPostRequest& setUrl(const std::string& url)
+    {
+        _url = url;
+
+        curl_easy_setopt(_handle.get(), CURLOPT_URL, _url.c_str());
+
+        return *this;
+    }
+
+    EasyCurlPostRequest& setHeaders(const std::vector<std::string>& headers)
+    {
+        _headers = headers;
+
+        for (const std::string& header: _headers)
+        {
+            *_headerList = curl_slist_append(*_headerList, header.c_str());
+        }
+
+        curl_easy_setopt(_handle.get(), CURLOPT_HTTPHEADER, *_headerList);
+
+        return *this;
+    }
+
+    EasyCurlPostRequest& setPayload(const std::string& payload)
+    {
+        _payload = payload;
+
+        curl_easy_setopt(_handle.get(), CURLOPT_POSTFIELDSIZE, _payload.size());
+        curl_easy_setopt(_handle.get(), CURLOPT_POSTFIELDS, _payload.c_str());
+
+        return *this;
+    }
+
+    EasyCurlPostRequest& setVerbose(bool flag = true)
+    {
+        curl_easy_setopt(_handle.get(), CURLOPT_VERBOSE, flag ? 1L : 0L);
+
+        return *this;
+    }
+
+    EasyCurlPostRequest& setCookie(const std::string& cookie)
+    {
+        _cookie = cookie;
+
+        curl_easy_setopt(_handle.get(), CURLOPT_COOKIE, _cookie.c_str());
+
+        return *this;
+    }
+
+    EasyCurlPostRequest& setConnectionTimeout(std::chrono::milliseconds timeout)
+    {
+        curl_easy_setopt(_handle.get(), CURLOPT_CONNECTTIMEOUT_MS, timeout.count());
+
+        return *this;
+    }
+
+    EasyCurlPostRequest& setTimeout(std::chrono::milliseconds timeout)
+    {
+        curl_easy_setopt(_handle.get(), CURLOPT_TIMEOUT_MS, timeout.count());
+
+        return *this;
+    }
+
+    EasyCurlPostRequest& setFollowLocation(bool flag = true)
+    {
+         curl_easy_setopt(_handle.get(), CURLOPT_FOLLOWLOCATION, flag ? 1L : 0L);
+
+         return *this;
+    }
+
+    EasyCurlPostRequest& setNoprogress(bool flag = true)
+    {
+        curl_easy_setopt(_handle.get(), CURLOPT_NOPROGRESS, flag ? 1L : 0L);
+
+        return *this;
+    }
+
+    CURLcode send()
+    {
+        _respBody.clear();
+        curl_easy_setopt(_handle.get(), CURLOPT_WRITEFUNCTION, writeCallback);
+        curl_easy_setopt(_handle.get(), CURLOPT_WRITEDATA, &_respBody);
+
+        _respHeaders.clear();
+        curl_easy_setopt(_handle.get(), CURLOPT_HEADERFUNCTION, headerCallback);
+        curl_easy_setopt(_handle.get(), CURLOPT_HEADERDATA, &_respHeaders);
+
+        // https://curl.se/libcurl/c/curl_easy_strerror.html
+        return curl_easy_perform(_handle.get());
+    }
+
+    std::string responseBody() const
+    {
+        return _respBody;
+    }
+
+    std::vector<std::string> responseHeaders() const
+    {
+        return _respHeaders;
+    }
+
+    std::string contentType()
+    {
+        char *contentType = nullptr;
+        curl_easy_getinfo(_handle.get(), CURLINFO_CONTENT_TYPE, &contentType);
+        return contentType;
+    }
+
+
+private:
+    struct HandleCleaner { void operator()(CURL* p) { curl_easy_cleanup(p); } };
+    struct HeadersCleaner { void operator()(curl_slist** pp) { curl_slist_free_all(*pp); } };
+
+    std::unique_ptr<CURL, HandleCleaner>         _handle;
+    std::unique_ptr<curl_slist*, HeadersCleaner> _headerList;
+
+    std::string              _url;
+
+    std::vector<std::string> _headers;
+    std::string              _payload;
+
+    std::string              _cookie;
+
+    std::string              _respBody;
+    std::vector<std::string> _respHeaders;
+
+    static std::size_t writeCallback(char *ptr, std::size_t size, size_t nmemb, void *userdata)
+    {
+        std::string* writeBuffer = (std::string*)userdata;
+        std::size_t realsize = size * nmemb;
+
+        (*writeBuffer) += std::string(ptr, realsize);
+
+        return realsize;
+     }
+
+    static std::size_t headerCallback(char *ptr, std::size_t size, size_t nmemb, void *userdata)
+    {
+        std::vector<std::string>* headersBuffer = static_cast<std::vector<std::string>*>(userdata);
+        std::size_t realsize = size * nmemb;
+
+        std::size_t headerSize = (realsize >= 2 && ptr[realsize - 2] == '\r' && ptr[realsize - 1] == '\n') ? realsize - 2 : realsize;
+
+        if (headerSize > 0)
+        {
+            headersBuffer->emplace_back(ptr, headerSize);
+        }
+
+        return realsize;
+     }
+};
+
+} // end of KAFKA_API
+