Add Jellyfin integration (#44401)

* Initial commit after scaffold setup

* Add initial config flow

* Create initial entity

* Ready for testing

* Can browse, no result yet

* Further improvements. Browsing is working.
Now need to work on proper stream URL

* Two valid URLs. Do not play in HA

* First working version for music

* Add thumbnail

* Includes Artist->Album hierarchy

* Add sorting of artists, albums and tracks

* Remove code for video libraries

* Improved code styling

* Optimize configuration flow

* Fix unit tests for config flow

* Fix import order

* Conform to style requirements

* Use empty string as media type for non playables

* 100% code coverage config_flow

* Type async_get_media_source

* Final docsctring fix after rebase

* Add __init__ and media_source files to .coveragerc

* Fix testing issues after rebase

* Fix string format issues and relative const import

* Remove unused manifest entries

* Raise ConfigEntry exceptions, not log errors

* Upgrade dependency to avoid WARNING on startup

* Change to builtin tuple and list (deprecation)

* Log broad exceptions

* Add strict typing

* Further type fixes after rebase

* Retry when cannot connect, otherwise fail setup

* Remove unused CONFIG_SCHEMA

* Enable strict typing checks

* FlowResultDict -> FlowResult

* Code quality improvements

* Resolve mypy.ini merge conflict

* Use unique userid generated by Jellyfin

* Update homeassistant/components/jellyfin/config_flow.py

Remove connection class from config flow

Co-authored-by: Milan Meulemans <milan.meulemans@live.be>

* Minor changes for additional checks after rebase

* Remove title from string and translations

* Changes wrt review

* Fixes based on rebase and review suggestions

* Move client initialization to separate file

* Remove persistent_notification, add test const.py

Co-authored-by: Milan Meulemans <milan.meulemans@live.be>

homeassistant/components/jellyfin/config_flow.py

@@ -0,0 +1,62 @@
+"""Config flow for the Jellyfin integration."""
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+import voluptuous as vol
+
+from homeassistant import config_entries
+from homeassistant.const import CONF_PASSWORD, CONF_URL, CONF_USERNAME
+from homeassistant.data_entry_flow import FlowResult
+
+from .client_wrapper import CannotConnect, InvalidAuth, create_client, validate_input
+from .const import DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+
+STEP_USER_DATA_SCHEMA = vol.Schema(
+    {
+        vol.Required(CONF_URL): str,
+        vol.Required(CONF_USERNAME): str,
+        vol.Required(CONF_PASSWORD): str,
+    }
+)
+
+
+class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
+    """Handle a config flow for Jellyfin."""
+
+    VERSION = 1
+
+    async def async_step_user(
+        self, user_input: dict[str, Any] | None = None
+    ) -> FlowResult:
+        """Handle a user defined configuration."""
+        if self._async_current_entries():
+            return self.async_abort(reason="single_instance_allowed")
+
+        errors: dict[str, str] = {}
+
+        if user_input is not None:
+            client = create_client()
+            try:
+                userid = await validate_input(self.hass, user_input, client)
+            except CannotConnect:
+                errors["base"] = "cannot_connect"
+            except InvalidAuth:
+                errors["base"] = "invalid_auth"
+            except Exception as ex:  # pylint: disable=broad-except
+                errors["base"] = "unknown"
+                _LOGGER.exception(ex)
+            else:
+                await self.async_set_unique_id(userid)
+                self._abort_if_unique_id_configured()
+
+                return self.async_create_entry(
+                    title=user_input[CONF_URL], data=user_input
+                )
+
+        return self.async_show_form(
+            step_id="user", data_schema=STEP_USER_DATA_SCHEMA, errors=errors
+        )