Zoneminder component (#3795)

* Initial Zoneminder commit

* Fixing bug when ZM sets its function to 'None'

* Adding zoneminder to coverage

* Quick Doc fix

* Update zoneminder.py

Doc Fix

* making the url base optional

homeassistant/components/sensor/zoneminder.py

@@ -0,0 +1,93 @@
+"""
+Support for Zoneminder Sensors.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.zoneminder/
+"""
+import logging
+
+import homeassistant.components.zoneminder as zoneminder
+from homeassistant.helpers.entity import Entity
+
+_LOGGER = logging.getLogger(__name__)
+
+DEPENDENCIES = ['zoneminder']
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Setup Zoneminder platform."""
+    sensors = []
+
+    monitors = zoneminder.get_state('api/monitors.json')
+    for i in monitors['monitors']:
+        sensors.append(
+            ZMSensorMonitors(int(i['Monitor']['Id']), i['Monitor']['Name'])
+        )
+        sensors.append(
+            ZMSensorEvents(int(i['Monitor']['Id']), i['Monitor']['Name'])
+        )
+
+    add_devices(sensors)
+
+
+class ZMSensorMonitors(Entity):
+    """Get the status of each monitor."""
+
+    def __init__(self, monitor_id, monitor_name):
+        """Initiate monitor sensor."""
+        self._monitor_id = monitor_id
+        self._monitor_name = monitor_name
+        self._state = None
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return "%s Status" % self._monitor_name
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._state
+
+    def update(self):
+        """Update the sensor."""
+        monitor = zoneminder.get_state(
+            'api/monitors/%i.json' % self._monitor_id
+        )
+        if monitor['monitor']['Monitor']['Function'] is None:
+            self._state = "None"
+        else:
+            self._state = monitor['monitor']['Monitor']['Function']
+
+
+class ZMSensorEvents(Entity):
+    """Get the number of events for each monitor."""
+
+    def __init__(self, monitor_id, monitor_name):
+        """Initiate event sensor."""
+        self._monitor_id = monitor_id
+        self._monitor_name = monitor_name
+        self._state = None
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return "%s Events" % self._monitor_name
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement of this entity, if any."""
+        return 'Events'
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._state
+
+    def update(self):
+        """Update the sensor."""
+        event = zoneminder.get_state(
+            'api/events/index/MonitorId:%i.json' % self._monitor_id
+        )
+
+        self._state = event['pagination']['count']