Synology Chat as a notification platform (#12596)

* first attempt at synology chat as a notification platform

* quick fix

* houndci and coverage

* Cleanup

Some cleanup of the file

* Ugh underscore

* Use string formatting

* Remove `CONF_NAME`

.coveragerc

@@ -509,6 +509,7 @@ omit =
     homeassistant/components/notify/simplepush.py
     homeassistant/components/notify/slack.py
     homeassistant/components/notify/smtp.py
+    homeassistant/components/notify/synology_chat.py
     homeassistant/components/notify/syslog.py
     homeassistant/components/notify/telegram.py
     homeassistant/components/notify/telstra.py

homeassistant/components/notify/synology_chat.py

@@ -0,0 +1,53 @@
+"""
+SynologyChat platform for notify component.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/notify.synology_chat/
+"""
+import logging
+import json
+
+import requests
+import voluptuous as vol
+
+from homeassistant.components.notify import (
+    BaseNotificationService, PLATFORM_SCHEMA)
+from homeassistant.const import CONF_RESOURCE
+import homeassistant.helpers.config_validation as cv
+
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_RESOURCE): cv.url,
+})
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def get_service(hass, config, discovery_info=None):
+    """Get the Synology Chat notification service."""
+    resource = config.get(CONF_RESOURCE)
+
+    return SynologyChatNotificationService(resource)
+
+
+class SynologyChatNotificationService(BaseNotificationService):
+    """Implementation of a notification service for Synology Chat."""
+
+    def __init__(self, resource):
+        """Initialize the service."""
+        self._resource = resource
+
+    def send_message(self, message="", **kwargs):
+        """Send a message to a user."""
+        data = {
+            'text': message
+        }
+
+        to_send = 'payload={}'.format(json.dumps(data))
+
+        response = requests.post(self._resource, data=to_send, timeout=10)
+
+        if response.status_code not in (200, 201):
+            _LOGGER.exception(
+                "Error sending message. Response %d: %s:",
+                response.status_code, response.reason)