Migrate Mailgun to use the webhook component

.coveragerc

@@ -209,7 +209,6 @@ omit =
     homeassistant/components/lutron_caseta.py
     homeassistant/components/*/lutron_caseta.py
 
-    homeassistant/components/mailgun.py
     homeassistant/components/*/mailgun.py
 
     homeassistant/components/matrix.py

homeassistant/components/ifttt/__init__.py

@@ -4,18 +4,15 @@
 For more details about this component, please refer to the documentation at
 https://home-assistant.io/components/ifttt/
 """
-from ipaddress import ip_address
 import json
 import logging
-from urllib.parse import urlparse
 
 import requests
 import voluptuous as vol
 
 import homeassistant.helpers.config_validation as cv
-from homeassistant import config_entries
 from homeassistant.const import CONF_WEBHOOK_ID
-from homeassistant.util.network import is_local
+from homeassistant.helpers import config_entry_flow
 
 REQUIREMENTS = ['pyfttt==0.3']
 DEPENDENCIES = ['webhook']
@@ -100,43 +97,11 @@ async def async_unload_entry(hass, entry):
     hass.components.webhook.async_unregister(entry.data[CONF_WEBHOOK_ID])
     return True
 
-
-@config_entries.HANDLERS.register(DOMAIN)
-class ConfigFlow(config_entries.ConfigFlow):
-    """Handle an IFTTT config flow."""
-
-    async def async_step_user(self, user_input=None):
-        """Handle a user initiated set up flow."""
-        if self._async_current_entries():
-            return self.async_abort(reason='one_instance_allowed')
-
-        try:
-            url_parts = urlparse(self.hass.config.api.base_url)
-
-            if is_local(ip_address(url_parts.hostname)):
-                return self.async_abort(reason='not_internet_accessible')
-        except ValueError:
-            # If it's not an IP address, it's very likely publicly accessible
-            pass
-
-        if user_input is None:
-            return self.async_show_form(
-                step_id='user',
-            )
-
-        webhook_id = self.hass.components.webhook.async_generate_id()
-        webhook_url = \
-            self.hass.components.webhook.async_generate_url(webhook_id)
-
-        return self.async_create_entry(
-            title='IFTTT Webhook',
-            data={
-                CONF_WEBHOOK_ID: webhook_id
-            },
-            description_placeholders={
-                'applet_url': 'https://ifttt.com/maker_webhooks',
-                'webhook_url': webhook_url,
-                'docs_url':
-                'https://www.home-assistant.io/components/ifttt/'
-            }
-        )
+config_entry_flow.register_webhook_flow(
+    DOMAIN,
+    'IFTTT Webhook',
+    {
+        'applet_url': 'https://ifttt.com/maker_webhooks',
+        'docs_url': 'https://www.home-assistant.io/components/ifttt/'
+    }
+)

homeassistant/components/mailgun/.translations/en.json

@@ -0,0 +1,18 @@
+{
+  "config": {
+    "title": "Mailgun",
+    "step": {
+      "user": {
+        "title": "Set up the Mailgun Webhook",
+        "description": "Are you sure you want to set up Mailgun?"
+      }
+    },
+    "abort": {
+      "one_instance_allowed": "Only a single instance is necessary.",
+      "not_internet_accessible": "Your Home Assistant instance needs to be accessible from the internet to receive Mailgun messages."
+    },
+    "create_entry": {
+      "default": "To send events to Home Assistant, you will need to setup [Webhooks with Mailgun]({mailgun_url}).\n\nFill in the following info:\n\n- URL: `{webhook_url}`\n- Method: POST\n- Content Type: application/x-www-form-urlencoded\n\nSee [the documentation]({docs_url}) on how to configure automations to handle incoming data."
+    }
+  }
+}

homeassistant/components/mailgun/__init__.py

@@ -0,0 +1,67 @@
+"""
+Support for Mailgun.
+
+For more details about this component, please refer to the documentation at
+https://home-assistant.io/components/mailgun/
+"""
+
+import voluptuous as vol
+
+import homeassistant.helpers.config_validation as cv
+from homeassistant.const import CONF_API_KEY, CONF_DOMAIN, CONF_WEBHOOK_ID
+from homeassistant.helpers import config_entry_flow
+
+DOMAIN = 'mailgun'
+API_PATH = '/api/{}'.format(DOMAIN)
+DEPENDENCIES = ['webhook']
+MESSAGE_RECEIVED = '{}_message_received'.format(DOMAIN)
+CONF_SANDBOX = 'sandbox'
+DEFAULT_SANDBOX = False
+
+CONFIG_SCHEMA = vol.Schema({
+    vol.Optional(DOMAIN): vol.Schema({
+        vol.Required(CONF_API_KEY): cv.string,
+        vol.Required(CONF_DOMAIN): cv.string,
+        vol.Optional(CONF_SANDBOX, default=DEFAULT_SANDBOX): cv.boolean,
+        vol.Optional(CONF_WEBHOOK_ID): cv.string,
+    }),
+}, extra=vol.ALLOW_EXTRA)
+
+
+async def async_setup(hass, config):
+    """Set up the Mailgun component."""
+    if DOMAIN not in config:
+        return True
+
+    hass.data[DOMAIN] = config[DOMAIN]
+    return True
+
+
+async def handle_webhook(hass, webhook_id, request):
+    """Handle incoming webhook with Mailgun inbound messages."""
+    data = dict(await request.post())
+    data['webhook_id'] = webhook_id
+    hass.bus.async_fire(MESSAGE_RECEIVED, data)
+
+
+async def async_setup_entry(hass, entry):
+    """Configure based on config entry."""
+    hass.components.webhook.async_register(
+        entry.data[CONF_WEBHOOK_ID], handle_webhook)
+    return True
+
+
+async def async_unload_entry(hass, entry):
+    """Unload a config entry."""
+    hass.components.webhook.async_unregister(entry.data[CONF_WEBHOOK_ID])
+    return True
+
+config_entry_flow.register_webhook_flow(
+    DOMAIN,
+    'Mailgun Webhook',
+    {
+        'mailgun_url':
+            'https://www.mailgun.com/blog/a-guide-to-using-mailguns-webhooks',
+        'docs_url': 'https://www.home-assistant.io/components/mailgun/'
+    }
+)

homeassistant/components/mailgun/strings.json

@@ -0,0 +1,18 @@
+{
+  "config": {
+    "title": "Mailgun",
+    "step": {
+      "user": {
+        "title": "Set up the Mailgun Webhook",
+        "description": "Are you sure you want to set up Mailgun?"
+      }
+    },
+    "abort": {
+      "one_instance_allowed": "Only a single instance is necessary.",
+      "not_internet_accessible": "Your Home Assistant instance needs to be accessible from the internet to receive Mailgun messages."
+    },
+    "create_entry": {
+      "default": "To send events to Home Assistant, you will need to setup [Webhooks with Mailgun]({mailgun_url}).\n\nFill in the following info:\n\n- URL: `{webhook_url}`\n- Method: POST\n- Content Type: application/x-www-form-urlencoded\n\nSee [the documentation]({docs_url}) on how to configure automations to handle incoming data."
+    }
+  }
+}

homeassistant/components/notify/mailgun.py

@@ -8,7 +8,8 @@
 
 import voluptuous as vol
 
-from homeassistant.components.mailgun import CONF_SANDBOX, DATA_MAILGUN
+from homeassistant.components.mailgun import (
+    CONF_SANDBOX, DOMAIN as MAILGUN_DOMAIN)
 from homeassistant.components.notify import (
     PLATFORM_SCHEMA, BaseNotificationService, ATTR_TITLE, ATTR_TITLE_DEFAULT,
     ATTR_DATA)
@@ -35,7 +36,7 @@
 
 def get_service(hass, config, discovery_info=None):
     """Get the Mailgun notification service."""
-    data = hass.data[DATA_MAILGUN]
+    data = hass.data[MAILGUN_DOMAIN]
     mailgun_service = MailgunNotificationService(
         data.get(CONF_DOMAIN), data.get(CONF_SANDBOX),
         data.get(CONF_API_KEY), config.get(CONF_SENDER),

homeassistant/config_entries.py

@@ -143,6 +143,7 @@ async def async_step_discovery(info):
     'ifttt',
     'ios',
     'lifx',
+    'mailgun',
     'mqtt',
     'nest',
     'openuv',

homeassistant/helpers/config_entry_flow.py

@@ -1,7 +1,10 @@
 """Helpers for data entry flows for config entries."""
 from functools import partial
+from ipaddress import ip_address
+from urllib.parse import urlparse
 
 from homeassistant import config_entries
+from homeassistant.util.network import is_local
 
 
 def register_discovery_flow(domain, title, discovery_function,
@@ -12,6 +15,14 @@ def register_discovery_flow(domain, title, discovery_function,
                 connection_class))
 
 
+def register_webhook_flow(domain, title, description_placeholder,
+                          allow_multiple=False):
+    """Register flow for webhook integrations."""
+    config_entries.HANDLERS.register(domain)(
+        partial(WebhookFlowHandler, domain, title, description_placeholder,
+                allow_multiple))
+
+
 class DiscoveryFlowHandler(config_entries.ConfigFlow):
     """Handle a discovery config flow."""
 
@@ -84,3 +95,50 @@ async def async_step_import(self, _):
             title=self._title,
             data={},
         )
+
+
+class WebhookFlowHandler(config_entries.ConfigFlow):
+    """Handle a webhook config flow."""
+
+    VERSION = 1
+
+    def __init__(self, domain, title, description_placeholder,
+                 allow_multiple):
+        """Initialize the discovery config flow."""
+        self._domain = domain
+        self._title = title
+        self._description_placeholder = description_placeholder
+        self._allow_multiple = allow_multiple
+
+    async def async_step_user(self, user_input=None):
+        """Handle a user initiated set up flow to create a webhook."""
+        if not self._allow_multiple and self._async_current_entries():
+            return self.async_abort(reason='one_instance_allowed')
+
+        try:
+            url_parts = urlparse(self.hass.config.api.base_url)
+
+            if is_local(ip_address(url_parts.hostname)):
+                return self.async_abort(reason='not_internet_accessible')
+        except ValueError:
+            # If it's not an IP address, it's very likely publicly accessible
+            pass
+
+        if user_input is None:
+            return self.async_show_form(
+                step_id='user',
+            )
+
+        webhook_id = self.hass.components.webhook.async_generate_id()
+        webhook_url = \
+            self.hass.components.webhook.async_generate_url(webhook_id)
+
+        self._description_placeholder['webhook_url'] = webhook_url
+
+        return self.async_create_entry(
+            title=self._title,
+            data={
+                'webhook_id': webhook_id
+            },
+            description_placeholders=self._description_placeholder
+        )

tests/components/ifttt/test_init.py

@@ -1,5 +1,5 @@
 """Test the init file of IFTTT."""
-from unittest.mock import Mock, patch
+from unittest.mock import patch
 
 from homeassistant import data_entry_flow
 from homeassistant.core import callback
@@ -36,13 +36,3 @@ def handle_event(event):
     assert len(ifttt_events) == 1
     assert ifttt_events[0].data['webhook_id'] == webhook_id
     assert ifttt_events[0].data['hello'] == 'ifttt'
-
-
-async def test_config_flow_aborts_external_url(hass, aiohttp_client):
-    """Test setting up IFTTT and sending webhook."""
-    hass.config.api = Mock(base_url='http://192.168.1.10')
-    result = await hass.config_entries.flow.async_init('ifttt', context={
-        'source': 'user'
-    })
-    assert result['type'] == data_entry_flow.RESULT_TYPE_ABORT
-    assert result['reason'] == 'not_internet_accessible'

tests/components/mailgun/__init__.py

@@ -0,0 +1 @@
+"""Tests for the Mailgun component."""