Add UpCloud platform (#12011)

* Add UpCloud platform

* Update upcloud-api to 0.4.1

* Update upcloud-api to 0.4.2

* Convert UpCloud to use Entity, helpers.dispatcher

* Lint

homeassistant/components/switch/upcloud.py

@@ -0,0 +1,52 @@
+"""
+Support for interacting with UpCloud servers.
+
+For more details about this component, please refer to the documentation at
+https://home-assistant.io/components/switch.upcloud/
+"""
+import logging
+
+import voluptuous as vol
+
+from homeassistant.const import STATE_OFF
+import homeassistant.helpers.config_validation as cv
+from homeassistant.components.switch import (SwitchDevice, PLATFORM_SCHEMA)
+from homeassistant.components.upcloud import (
+    UpCloudServerEntity, CONF_SERVERS, DATA_UPCLOUD)
+
+_LOGGER = logging.getLogger(__name__)
+
+DEPENDENCIES = ['upcloud']
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_SERVERS): vol.All(cv.ensure_list, [cv.string]),
+})
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Set up the UpCloud server switch."""
+    upcloud = hass.data[DATA_UPCLOUD]
+
+    servers = config.get(CONF_SERVERS)
+
+    devices = [UpCloudSwitch(upcloud, uuid) for uuid in servers]
+
+    add_devices(devices, True)
+
+
+class UpCloudSwitch(UpCloudServerEntity, SwitchDevice):
+    """Representation of an UpCloud server switch."""
+
+    def __init__(self, upcloud, uuid):
+        """Initialize a new UpCloud server switch."""
+        UpCloudServerEntity.__init__(self, upcloud, uuid)
+
+    def turn_on(self, **kwargs):
+        """Start the server."""
+        if self.state == STATE_OFF:
+            self.data.start()
+
+    def turn_off(self, **kwargs):
+        """Stop the server."""
+        if self.is_on:
+            self.data.stop()