Add telegram channel and message

src/channels/TelegramChannel.php

@@ -0,0 +1,100 @@
+<?php
+
+namespace tuyakhov\notifications\channels;
+
+use tuyakhov\notifications\NotifiableInterface;
+use tuyakhov\notifications\NotificationInterface;
+use tuyakhov\notifications\messages\TelegramMessage;
+use yii\base\Component;
+use yii\di\Instance;
+use yii\helpers\ArrayHelper;
+use yii\httpclient\Client;
+
+class TelegramChannel extends Component implements ChannelInterface
+{
+    /**
+     * @var BaseActiveRecord|string
+     */
+    public $model = 'app\additional\notification\Notification';
+
+    /**
+     * @var Client|array|string
+     */
+    public $httpClient;
+
+    /**
+     * @var string
+     */
+    public $api_url = "https://api.telegram.org/bot";
+
+    /**
+     * @var string
+     */
+    public $bot_id;
+
+    /**
+     * @var string
+     */
+    public $bot_token;
+
+    /**
+     * @var string
+     */
+    public $parse_mode = null;
+
+    const PARSE_MODE_HTML = "HTML";
+
+    const PARSE_MODE_MARKDOWN = "Markdown";
+
+    /**
+     * @throws \yii\base\InvalidConfigException
+     */
+    public function init()
+    {
+        parent::init();
+
+        if(!isset($this->bot_id) || !isset($this->bot_token)){
+            throw new InvalidConfigException("Bot id or bot token is undefined");
+        }
+
+        if (!isset($this->httpClient)) {
+            $this->httpClient = [
+                'class' => Client::className(),
+            ];
+        }
+        $this->httpClient = Instance::ensure($this->httpClient, Client::className());
+    }
+
+    /**
+     * @param NotifiableInterface $recipient
+     * @param NotificationInterface $notification
+     * @return mixed
+     */
+    public function send(NotifiableInterface $recipient, NotificationInterface $notification)
+    {
+        /** @var TelegramMessage $message */
+        $message = $notification->exportFor('telegram');
+        $text = "*{$message->subject}*\n{$message->body}";
+        $chatId = $recipient->routeNotificationFor('telegram');
+
+        $data = [
+            "chat_id" => $chatId,
+            "text" => $text,
+        ];
+        if($this->parse_mode != null){
+            $data["parse_mode"] = $this->parse_mode;
+        }
+
+        $resultUrl = $this->createUrl();
+        return $this->httpClient->createRequest()
+            ->setMethod('post')
+            ->setUrl($resultUrl)
+            ->setData($data)
+            ->send();
+    }
+
+    private function createUrl()
+    {
+        return $this->api_url . $this->bot_id . ":" . $this->bot_token . "/sendmessage";
+    }
+}

src/messages/TelegramMessage.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace tuyakhov\notifications\messages;
+
+class TelegramMessage extends AbstractMessage
+{
+}