Add Monzo integration

.coveragerc

@@ -810,6 +810,8 @@ omit =
     homeassistant/components/moehlenhoff_alpha2/binary_sensor.py
     homeassistant/components/moehlenhoff_alpha2/climate.py
     homeassistant/components/moehlenhoff_alpha2/sensor.py
+    homeassistant/components/monzo/__init__.py
+    homeassistant/components/monzo/api.py
     homeassistant/components/motion_blinds/__init__.py
     homeassistant/components/motion_blinds/coordinator.py
     homeassistant/components/motion_blinds/cover.py

.strict-typing

@@ -300,6 +300,7 @@ homeassistant.components.minecraft_server.*
 homeassistant.components.mjpeg.*
 homeassistant.components.modbus.*
 homeassistant.components.modem_callerid.*
+homeassistant.components.monzo.*
 homeassistant.components.moon.*
 homeassistant.components.mopeka.*
 homeassistant.components.motionmount.*

CODEOWNERS

@@ -867,6 +867,8 @@ build.json @home-assistant/supervisor
 /tests/components/moehlenhoff_alpha2/ @j-a-n
 /homeassistant/components/monoprice/ @etsinko @OnFreund
 /tests/components/monoprice/ @etsinko @OnFreund
+/homeassistant/components/monzo/ @jakemartin-icl
+/tests/components/monzo/ @jakemartin-icl
 /homeassistant/components/moon/ @fabaff @frenck
 /tests/components/moon/ @fabaff @frenck
 /homeassistant/components/mopeka/ @bdraco

homeassistant/components/monzo/__init__.py

@@ -0,0 +1,68 @@
+"""The Monzo integration."""
+
+from __future__ import annotations
+
+from datetime import timedelta
+import logging
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import aiohttp_client, config_entry_oauth2_flow
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
+
+from .api import AuthenticatedMonzoAPI
+from .const import DOMAIN
+from .data import MonzoData, MonzoSensorData
+
+PLATFORMS: list[Platform] = [Platform.SENSOR]
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Set up Monzo from a config entry."""
+    implementation = (
+        await config_entry_oauth2_flow.async_get_config_entry_implementation(
+            hass, entry
+        )
+    )
+
+    async def async_get_monzo_api_data() -> MonzoSensorData:
+        monzo_data: MonzoData = hass.data[DOMAIN][entry.entry_id]
+        accounts = await external_api.user_account.accounts()
+        pots = await external_api.user_account.pots()
+        monzo_data.accounts = accounts
+        monzo_data.pots = pots
+        return MonzoSensorData(accounts=accounts, pots=pots)
+
+    session = config_entry_oauth2_flow.OAuth2Session(hass, entry, implementation)
+
+    external_api = AuthenticatedMonzoAPI(
+        aiohttp_client.async_get_clientsession(hass), session
+    )
+
+    coordinator = DataUpdateCoordinator(
+        hass,
+        logging.getLogger(__name__),
+        name=DOMAIN,
+        update_method=async_get_monzo_api_data,
+        update_interval=timedelta(minutes=1),
+    )
+    hass.data.setdefault(DOMAIN, {})
+    hass.data[DOMAIN][entry.entry_id] = MonzoData(external_api, coordinator)
+
+    await coordinator.async_config_entry_first_refresh()
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Unload a config entry."""
+    data = hass.data[DOMAIN]
+
+    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
+
+    if unload_ok and entry.entry_id in data:
+        data.pop(entry.entry_id)
+
+    return unload_ok

homeassistant/components/monzo/api.py

@@ -0,0 +1,26 @@
+"""API for Monzo bound to Home Assistant OAuth."""
+
+from aiohttp import ClientSession
+from monzopy import AbstractMonzoApi
+
+from homeassistant.helpers import config_entry_oauth2_flow
+
+
+class AuthenticatedMonzoAPI(AbstractMonzoApi):
+    """A Monzo API instance with authentication tied to an OAuth2 based config entry."""
+
+    def __init__(
+        self,
+        websession: ClientSession,
+        oauth_session: config_entry_oauth2_flow.OAuth2Session,
+    ) -> None:
+        """Initialize Monzo auth."""
+        super().__init__(websession)
+        self._oauth_session = oauth_session
+
+    async def async_get_access_token(self) -> str:
+        """Return a valid access token."""
+        if not self._oauth_session.valid_token:
+            await self._oauth_session.async_ensure_token_valid()
+
+        return str(self._oauth_session.token["access_token"])

homeassistant/components/monzo/application_credentials.py

@@ -0,0 +1,15 @@
+"""application_credentials platform the Monzo integration."""
+
+from homeassistant.components.application_credentials import AuthorizationServer
+from homeassistant.core import HomeAssistant
+
+OAUTH2_AUTHORIZE = "https://auth.monzo.com"
+OAUTH2_TOKEN = "https://api.monzo.com/oauth2/token"
+
+
+async def async_get_authorization_server(hass: HomeAssistant) -> AuthorizationServer:
+    """Return authorization server."""
+    return AuthorizationServer(
+        authorize_url=OAUTH2_AUTHORIZE,
+        token_url=OAUTH2_TOKEN,
+    )

homeassistant/components/monzo/config_flow.py

@@ -0,0 +1,52 @@
+"""Config flow for Monzo."""
+
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+import voluptuous as vol
+
+from homeassistant.config_entries import ConfigFlowResult
+from homeassistant.const import CONF_TOKEN
+from homeassistant.helpers import config_entry_oauth2_flow
+
+from .const import DOMAIN
+
+
+class MonzoFlowHandler(
+    config_entry_oauth2_flow.AbstractOAuth2FlowHandler, domain=DOMAIN
+):
+    """Handle a config flow."""
+
+    DOMAIN = DOMAIN
+
+    oauth_data: dict[str, Any]
+
+    @property
+    def logger(self) -> logging.Logger:
+        """Return logger."""
+        return logging.getLogger(__name__)
+
+    async def async_step_await_approval_confirmation(
+        self, user_input: dict[str, Any] | None = None
+    ) -> ConfigFlowResult:
+        """Wait for the user to confirm in-app approval."""
+        if user_input is not None:
+            return self.async_create_entry(title=DOMAIN, data={**self.oauth_data})
+
+        data_schema = vol.Schema({vol.Required("confirm"): bool})
+
+        return self.async_show_form(
+            step_id="await_approval_confirmation", data_schema=data_schema
+        )
+
+    async def async_oauth_create_entry(self, data: dict[str, Any]) -> ConfigFlowResult:
+        """Create an entry for the flow."""
+        user_id = str(data[CONF_TOKEN]["user_id"])
+        await self.async_set_unique_id(user_id)
+        self._abort_if_unique_id_configured()
+
+        self.oauth_data = data
+
+        return await self.async_step_await_approval_confirmation()

homeassistant/components/monzo/const.py

@@ -0,0 +1,3 @@
+"""Constants for the Monzo integration."""
+
+DOMAIN = "monzo"

homeassistant/components/monzo/data.py

@@ -0,0 +1,24 @@
+"""Dataclass for Monzo data."""
+
+from dataclasses import dataclass, field
+from typing import Any
+
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
+
+from .api import AuthenticatedMonzoAPI
+
+
+@dataclass(kw_only=True)
+class MonzoSensorData:
+    """A dataclass for holding sensor data returned by the DataUpdateCoordinator."""
+
+    accounts: list[dict[str, Any]] = field(default_factory=list)
+    pots: list[dict[str, Any]] = field(default_factory=list)
+
+
+@dataclass
+class MonzoData(MonzoSensorData):
+    """A dataclass for holding data stored in hass.data."""
+
+    external_api: AuthenticatedMonzoAPI
+    coordinator: DataUpdateCoordinator[MonzoSensorData]

homeassistant/components/monzo/entity.py

@@ -0,0 +1,47 @@
+"""Base entity for Monzo."""
+
+from __future__ import annotations
+
+from collections.abc import Callable
+from typing import Any
+
+from homeassistant.helpers.device_registry import DeviceEntryType, DeviceInfo
+from homeassistant.helpers.update_coordinator import (
+    CoordinatorEntity,
+    DataUpdateCoordinator,
+)
+
+from .const import DOMAIN
+from .data import MonzoSensorData
+
+
+class MonzoBaseEntity(CoordinatorEntity[DataUpdateCoordinator[MonzoSensorData]]):
+    """Common base for Monzo entities."""
+
+    _attr_attribution = "Data provided by Monzo"
+    _attr_has_entity_name = True
+
+    def __init__(
+        self,
+        coordinator: DataUpdateCoordinator[MonzoSensorData],
+        index: int,
+        device_model: str,
+        data_accessor: Callable[[MonzoSensorData], list[dict[str, Any]]],
+    ) -> None:
+        """Initialize sensor."""
+        super().__init__(coordinator)
+        self.index = index
+        self._data_accessor = data_accessor
+
+        self._attr_device_info = DeviceInfo(
+            entry_type=DeviceEntryType.SERVICE,
+            identifiers={(DOMAIN, str(self.data["id"]))},
+            manufacturer="Monzo",
+            model=device_model,
+            name=self.data["name"],
+        )
+
+    @property
+    def data(self) -> dict[str, Any]:
+        """Shortcut to access coordinator data for the entity."""
+        return self._data_accessor(self.coordinator.data)[self.index]

homeassistant/components/monzo/manifest.json

@@ -0,0 +1,10 @@
+{
+  "domain": "monzo",
+  "name": "Monzo",
+  "codeowners": ["@jakemartin-icl"],
+  "config_flow": true,
+  "dependencies": ["application_credentials"],
+  "documentation": "https://www.home-assistant.io/integrations/monzo",
+  "iot_class": "cloud_polling",
+  "requirements": ["monzopy==1.1.0"]
+}