Add initial Z-Wave config panel (#5937)

* Add Z-Wave config panel

* Add config to Z-Wave dependencies

* Lint

* lint

* Add tests

* Remove temp workaround

* Lint

* Fix tests

* Address comments

* Fix tests under Py34

homeassistant/components/config/zwave.py

@@ -0,0 +1,78 @@
+"""Provide configuration end points for Z-Wave."""
+import asyncio
+import os
+import voluptuous as vol
+
+from homeassistant.components.http import HomeAssistantView
+from homeassistant.components.zwave import DEVICE_CONFIG_SCHEMA_ENTRY
+from homeassistant.util.yaml import load_yaml, dump
+
+
+DEVICE_CONFIG = 'zwave_device_config.yml'
+
+
+@asyncio.coroutine
+def async_setup(hass):
+    """Setup the hassbian config."""
+    hass.http.register_view(DeviceConfigView)
+    return True
+
+
+class DeviceConfigView(HomeAssistantView):
+    """Configure a Z-Wave device endpoint."""
+
+    url = '/api/config/zwave/device_config/{entity_id}'
+    name = 'api:config:zwave:device_config:update'
+
+    @asyncio.coroutine
+    def get(self, request, entity_id):
+        """Fetch device specific config."""
+        hass = request.app['hass']
+        current = yield from hass.loop.run_in_executor(
+            None, _read, hass.config.path(DEVICE_CONFIG))
+        return self.json(current.get(entity_id, {}))
+
+    @asyncio.coroutine
+    def post(self, request, entity_id):
+        """Validate config and return results."""
+        try:
+            data = yield from request.json()
+        except ValueError:
+            return self.json_message('Invalid JSON specified', 400)
+
+        try:
+            # We just validate, we don't store that data because
+            # we don't want to store the defaults.
+            DEVICE_CONFIG_SCHEMA_ENTRY(data)
+        except vol.Invalid as err:
+            print(data, err)
+            return self.json_message('Message malformed: {}'.format(err), 400)
+
+        hass = request.app['hass']
+        path = hass.config.path(DEVICE_CONFIG)
+        current = yield from hass.loop.run_in_executor(
+            None, _read, hass.config.path(DEVICE_CONFIG))
+        current.setdefault(entity_id, {}).update(data)
+
+        yield from hass.loop.run_in_executor(
+            None, _write, hass.config.path(path), current)
+
+        return self.json({
+            'result': 'ok',
+        })
+
+
+def _read(path):
+    """Read YAML helper."""
+    if not os.path.isfile(path):
+        with open(path, 'w'):
+            pass
+        return {}
+
+    return load_yaml(path)
+
+
+def _write(path, data):
+    """Write YAML helper."""
+    with open(path, 'w') as outfile:
+        dump(data, outfile)