Publish LumaOps source

dependencies/hueplusplus-1.2.0/examples/UsernameConfig.cpp

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+/**
+    \file UsernameConfig.cpp
+    Copyright Notice\n
+    Copyright (C) 2021  Jan Rogall		- developer\n
+
+    This file is part of hueplusplus.
+
+    hueplusplus is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    hueplusplus 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with hueplusplus.  If not, see <http://www.gnu.org/licenses/>.
+
+    \example{lineno} UsernameConfig.cpp
+    This example reads the username and mac address from a config file.
+**/
+
+#include <algorithm>
+#include <fstream>
+#include <iomanip>
+#include <iostream>
+
+#include <hueplusplus/Bridge.h>
+
+#ifdef _MSC_VER
+#include <hueplusplus/WinHttpHandler.h>
+
+using SystemHttpHandler = hueplusplus::WinHttpHandler;
+
+#else
+#include <hueplusplus/LinHttpHandler.h>
+
+using SystemHttpHandler = hueplusplus::LinHttpHandler;
+
+#endif
+
+namespace hue = hueplusplus;
+
+// Reads a json config file.
+// filename: Path to the config file
+// returns parsed json or an empty object if not successful.
+nlohmann::json readConfigFile(const std::string& filename)
+{
+    std::ifstream stream(filename);
+    try
+    {
+        nlohmann::json result = nlohmann::json::object();
+        if (stream)
+        {
+            stream >> result;
+        }
+        return result;
+    }
+    catch (const nlohmann::json::exception&)
+    {
+        // Ignore parse errors
+        return nlohmann::json::object();
+    }
+}
+
+// Saves a json file.
+// filename: Path to the config file
+// config: Json value to save
+void saveConfigFile(const std::string& filename, const nlohmann::json& config)
+{
+    std::ofstream stream(filename);
+    stream << std::setw(4) << config;
+}
+
+// Connects to a bridge and returns it
+// username: Already existing username, can be left empty.
+// macAddress: MAC address of the bridge, can be left empty.
+// throws std::runtime_error when the bridge was not found.
+// returns a connected bridge.
+hue::Bridge connectToBridge(const std::string& username, const std::string& macAddress)
+{
+    hue::BridgeFinder finder(std::make_shared<SystemHttpHandler>());
+
+    std::vector<hue::BridgeFinder::BridgeIdentification> bridges = finder.findBridges();
+
+    for (const auto& bridge : bridges)
+    {
+        std::cout << "Bridge: " << bridge.mac << " at " << bridge.ip << '\n';
+    }
+    if (bridges.empty())
+    {
+        std::cout << "Found no bridges\n";
+        throw std::runtime_error("no bridges found");
+    }
+
+    if (macAddress.empty())
+    {
+        std::cout << "No bridge given, connecting to first one.\n";
+        return finder.getBridge(bridges.front());
+    }
+    if (!username.empty())
+    {
+        finder.addUsername(macAddress, username);
+    }
+    auto it = std::find_if(
+        bridges.begin(), bridges.end(), [&](const auto& identification) { return identification.mac == macAddress; });
+    if (it == bridges.end())
+    {
+        std::cout << "Given bridge not found\n";
+        throw std::runtime_error("bridge not found");
+    }
+    return finder.getBridge(*it);
+}
+
+// Connects to a bridge. The steps are:
+// - read "config.json" for an existing config
+// - connect to the bridge
+// - save the username to the config file for the next run
+// 
+// Also prints out the IP and username.
+int main(int argc, char** argv)
+{
+
+    const std::string filename = "config.json";
+    try
+    {
+
+        nlohmann::json config = readConfigFile(filename);
+        const std::string username = config.value("username", "");
+        const std::string macAddress = config.value("mac", "");
+        hue::Bridge hue = connectToBridge(username, macAddress);
+
+        // Store updated information into file
+        config["username"] = hue.getUsername();
+        config["mac"] = hue.config().getMACAddress();
+        saveConfigFile(filename, config);
+
+        std::cout << "Connected to bridge. IP: " << hue.getBridgeIP() << ", username: " << hue.getUsername() << '\n';
+    }
+    catch (...)
+    { }
+
+    std::cout << "Press enter to exit\n";
+    std::cin.get();
+
+    return 0;
+}