Added cameras menu: one can get image from camera

CamerasMenuUserState.cs

@@ -0,0 +1,111 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Telegram.Bot;
+using Telegram.Bot.Args;
+using Telegram.Bot.Types.InputFiles;
+using Telegram.Bot.Types.ReplyMarkups;
+using ZaoBot.OpenHab;
+
+namespace ZaoBot
+{
+	class CameraConfigData
+	{
+		public string name;
+		public string url;
+	}
+
+	class CamerasMenuUserState : IUserState
+	{
+		public const string CMD_BACK = "Назад";
+
+		ITelegramBotClient botClient;
+		private JsonDocument config;
+		List<CameraConfigData> cameras;
+		OpenHabClient openhab;
+
+		public CamerasMenuUserState(ITelegramBotClient botClient, JsonDocument config, OpenHabClient openhab)
+		{
+			this.botClient = botClient;
+			this.config = config;
+			this.openhab = openhab;
+			cameras = new List<CameraConfigData>();
+			foreach (var element in config.RootElement.GetProperty("cameras").EnumerateObject())
+			{
+				var cam = new CameraConfigData()
+				{
+					name = element.Name,
+					url = element.Value.GetString(),
+				};
+				cameras.Add(cam);
+			}
+		}
+
+		public async Task<IUserState> ProcessMessage(IUserState previous, MessageEventArgs e)
+		{
+			if (e.Message.Text == CMD_BACK)
+			{
+				var newState = new MainMenuUserState(botClient, config, openhab);
+				await newState.ProcessMessage(this, e);
+				return newState;
+			}
+			var response = "Выберите камеру";
+
+			foreach (var cam in cameras)
+			{
+				if (e.Message.Text == cam.name)
+				{
+					try
+					{
+						SendCameraImage(e.Message.Chat, cam);
+					}
+					catch (Exception ex)
+					{
+						await botClient.SendTextMessageAsync(chatId: e.Message.Chat,
+						  text: "Error: " + ex.Message);
+					}
+				}
+			}
+			var buttons = new KeyboardButton[cameras.Count + 1][];
+			for (int i = 0; i < cameras.Count; i++)
+			{
+				buttons[i] = new KeyboardButton[] { cameras[i].name };
+			}
+			buttons[cameras.Count] = new KeyboardButton[] { CMD_BACK };
+
+			var replyKeyboardMarkup = new ReplyKeyboardMarkup(
+			   buttons,
+			   resizeKeyboard: true
+		   );
+
+			await botClient.SendTextMessageAsync(
+			  chatId: e.Message.Chat,
+			  text: response,
+			  replyMarkup: replyKeyboardMarkup
+			);
+			return this;
+		}
+
+		private async void SendCameraImage(Telegram.Bot.Types.Chat chat, CameraConfigData cam)
+		{
+			using (WebClient client = new WebClient())
+			{
+				await client.DownloadFileTaskAsync(
+					new System.Uri(cam.url),
+					"temp.jpg"
+				);
+				using (Stream stream = File.OpenRead("temp.jpg"))
+				{
+					await botClient.SendDocumentAsync(
+						chatId: chat,
+						document: new InputOnlineFile(content: stream, fileName: cam.name + ".jpg")
+					);
+				}
+			}
+		}
+	}
+}

MainMenuUserState.cs

@@ -17,6 +17,7 @@ namespace ZaoBot
 		const string CMD_STATUS = "Статус";
 		const string CMD_LEFT_GATE = "Открой левые ворота";
 		const string CMD_RIGHT_GATE = "Открой правые ворота";
+		const string CMD_CAMERAS = "Камеры";
 
 		ITelegramBotClient botClient;
 		private JsonDocument config;
@@ -64,6 +65,12 @@ namespace ZaoBot
 					await newState.ProcessMessage(this, e);
 					return newState;
 				}
+				else if (e.Message.Text == CMD_CAMERAS)
+				{
+					var newState = new CamerasMenuUserState(botClient, config, openhab);
+					await newState.ProcessMessage(this, e);
+					return newState;
+				}
 				else if (e.Message.Text == "")
 				{
 					response = "Превед!";
@@ -81,6 +88,7 @@ namespace ZaoBot
 						new KeyboardButton[] { CMD_WEATHER },
 						new KeyboardButton[] { CMD_LEFT_GATE, CMD_RIGHT_GATE },
 						new KeyboardButton[] { CMD_STATUS },
+						new KeyboardButton[] { CMD_CAMERAS },
 				},
 				resizeKeyboard: true
 			);

OpenHab/OpenHabClient.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Net.Http;
+using System.Net.Http.Headers;
 using System.Text;
 using System.Text.Json;
 using System.Threading.Tasks;
@@ -10,11 +11,17 @@ namespace ZaoBot.OpenHab
 	class OpenHabClient
 	{
 		private string url;
+		private string token;
 		HttpClient http = new HttpClient();
 
-		public OpenHabClient(string url)
+		public OpenHabClient(string url, string token = "")
 		{
 			this.url = url;
+			this.token = token;
+			if (!string.IsNullOrEmpty(token))
+			{
+				http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", token + ":");
+			}
 		}
 
 		public async Task<ItemState> GetItemState(string item)