extracted http client

src/lib/utils/httpclient.h

@@ -0,0 +1,111 @@
+/*
+ * ebusd - daemon for communication with eBUS heating systems.
+ * Copyright (C) 2018 John Baier <ebusd@ebusd.eu>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIB_UTILS_HTTP_H_
+#define LIB_UTILS_HTTP_H_
+
+#include <unistd.h>
+#include <cstdint>
+#include <string>
+#include "lib/utils/tcpsocket.h"
+
+
+/** typedef for referencing @a sockaddr_in within namespace. */
+typedef struct sockaddr_in socketaddress;
+
+namespace ebusd {
+
+/** \file lib/utils/http.h */
+
+using std::string;
+using std::ifstream;
+
+/**
+ * Helper class for handling HTTP client requests.
+ */
+class HttpClient {
+
+ public:
+  /**
+   * Constructor.
+   */
+  HttpClient() : m_socket(nullptr), m_bufferSize(0), m_buffer(nullptr) {}
+
+  /**
+   * Destructor.
+   */
+  ~HttpClient() {
+    if (m_socket) {
+      delete m_socket;
+      m_socket = nullptr;
+    }
+    if (m_buffer) {
+      free(m_buffer);
+      m_buffer = nullptr;
+    }
+  }
+
+  /**
+   * Connect to the specified server.
+   * @param host the host name to connect to.
+   * @param port the port to connect to.
+   * @param timeout the timeout in seconds, defaults to 5 seconds.
+   * @param userAgent the optional user agent to send in the request header.
+   * @return true on success, false on connect failure.
+   */
+  bool connect(const string& host, uint16_t port, const string& userAgent = "", int timeout = 5);
+
+  /**
+   * Execute a GET request.
+   * @param uri the URI string.
+   * @param body the optional body to send.
+   * @param response the response body from the server (or the HTTP header on error).
+   * @return true on success, false on error.
+   */
+  bool get(const string& uri, const string& body, string& response);
+
+  /**
+   * Execute a POST request.
+   * @param uri the URI string.
+   * @param body the optional body to send.
+   * @param response the response body from the server (or the HTTP header on error).
+   * @return true on success, false on error.
+   */
+  bool post(const string& uri, const string& body, string& response);
+
+  /**
+   * Execute an arbitrary request.
+   * @param uri the URI string.
+   * @param body the optional body to send.
+   * @param response the response body from the server (or the HTTP header on error).
+   * @return true on success, false on error.
+   */
+  bool request(const string& method, const string& uri, const string& body, string& response);
+
+private:
+  TCPClient m_client;
+  string m_host;
+  string m_userAgent;
+  TCPSocket* m_socket;
+  size_t m_bufferSize;
+  char* m_buffer;
+};
+
+}  // namespace ebusd
+
+#endif  //LIB_UTILS_HTTP_H_