Files
alpinebits_python/src/alpine_bits_python/alpinebits_server.py
2025-11-27 18:57:45 +01:00

830 lines
29 KiB
Python

"""AlpineBits Server for handling hotel data exchange.
This module provides an asynchronous AlpineBits server that can handle various
OTA (OpenTravel Alliance) actions for hotel data exchange. Currently implements
handshaking functionality with configurable supported actions and capabilities.
"""
import inspect
import json
import re
from abc import ABC
from dataclasses import dataclass
from datetime import datetime
from enum import Enum
from typing import Any, Optional, override
from xsdata.formats.dataclass.serializers.config import SerializerConfig
from xsdata_pydantic.bindings import XmlParser, XmlSerializer
from alpine_bits_python.alpine_bits_helpers import (
create_res_notif_push_message,
create_res_retrieve_response,
)
from alpine_bits_python.logging_config import get_logger
from .const import HttpStatusCode
from .db import Customer, Reservation
from .generated.alpinebits import (
OtaNotifReportRq,
OtaNotifReportRs,
OtaPingRq,
OtaPingRs,
OtaReadRq,
WarningStatus,
)
from .reservation_service import ReservationService
# Configure logging
_LOGGER = get_logger(__name__)
def dump_json_for_xml(json_content: Any) -> str:
"""Dump JSON content as a pretty-printed string for embedding in XML.
Adds newlines before and after the JSON block for better readability in XML.
"""
return json.dumps(json_content)
class AlpineBitsActionName(Enum):
"""Enum for AlpineBits action names with capability and request name mappings."""
# Format: (capability_name, actual_request_name)
OTA_PING = ("action_OTA_Ping", "OTA_Ping:Handshaking")
OTA_READ = ("action_OTA_Read", "OTA_Read:GuestRequests")
OTA_HOTEL_AVAIL_NOTIF = ("action_OTA_HotelAvailNotif", "OTA_HotelAvailNotif")
OTA_HOTEL_RES_NOTIF_GUEST_REQUESTS = ( ## Push Action for Guest Requests
"action_OTA_HotelResNotif_GuestRequests",
"OTA_HotelResNotif:GuestRequests",
)
OTA_HOTEL_NOTIF_REPORT = (
"action_OTA_Read", # if read is supported this is also supported
"OTA_NotifReport:GuestRequests",
)
OTA_HOTEL_DESCRIPTIVE_CONTENT_NOTIF_INVENTORY = (
"action_OTA_HotelDescriptiveContentNotif_Inventory",
"OTA_HotelDescriptiveContentNotif:Inventory",
)
OTA_HOTEL_DESCRIPTIVE_CONTENT_NOTIF_INFO = (
"action_OTA_HotelDescriptiveContentNotif_Info",
"OTA_HotelDescriptiveContentNotif:Info",
)
OTA_HOTEL_DESCRIPTIVE_INFO_INVENTORY = (
"action_OTA_HotelDescriptiveInfo_Inventory",
"OTA_HotelDescriptiveInfo:Inventory",
)
OTA_HOTEL_DESCRIPTIVE_INFO_INFO = (
"action_OTA_HotelDescriptiveInfo_Info",
"OTA_HotelDescriptiveInfo:Info",
)
OTA_HOTEL_RATE_PLAN_NOTIF_RATE_PLANS = (
"action_OTA_HotelRatePlanNotif_RatePlans",
"OTA_HotelRatePlanNotif:RatePlans",
)
OTA_HOTEL_RATE_PLAN_BASE_RATES = (
"action_OTA_HotelRatePlan_BaseRates",
"OTA_HotelRatePlan:BaseRates",
)
OTA_HOTEL_INV_COUNT_NOTIF_FREE_ROOMS = (
"action_OTA_HotelInvCountNotif",
"OTA_HotelInvCountNotif:FreeRooms",
)
def __init__(self, capability_name: str, request_name: str):
self.capability_name = capability_name
self.request_name = request_name
@classmethod
def get_by_capability_name(
cls, capability_name: str
) -> Optional["AlpineBitsActionName"]:
"""Get action enum by capability name."""
for action in cls:
if action.capability_name == capability_name:
return action
return None
@classmethod
def get_by_request_name(cls, request_name: str) -> Optional["AlpineBitsActionName"]:
"""Get action enum by request name."""
for action in cls:
if action.request_name == request_name:
return action
return None
class Version(str, Enum):
"""Enum for AlpineBits versions."""
V2024_10 = "2024-10"
V2022_10 = "2022-10"
# Add other versions as needed
class AlpineBitsClientInfo:
"""Wrapper for username, password, client_id."""
def __init__(self, username: str, password: str, client_id: str | None = None):
self.username = username
self.password = password
self.client_id = client_id
@dataclass
class AlpineBitsResponse:
"""Response data structure for AlpineBits actions."""
xml_content: str
status_code: HttpStatusCode = HttpStatusCode.OK
def __post_init__(self):
"""Validate that status code is one of the allowed values."""
if self.status_code not in [200, 400, 401, 500]:
raise ValueError(
"Invalid status code %s. Must be 200, 400, 401, or 500",
self.status_code,
)
# Abstract base class for AlpineBits Action
class AlpineBitsAction(ABC):
"""Abstract base class for handling AlpineBits actions."""
name: AlpineBitsActionName
version: (
Version | list[Version]
) # list of versions in case action supports multiple versions
async def handle(
self,
action: str,
request_xml: str,
version: Version,
client_info: AlpineBitsClientInfo,
dbsession=None,
server_capabilities=None,
) -> AlpineBitsResponse:
"""Handle the incoming request XML and return response XML.
Default implementation returns "not implemented" error.
Override this method in subclasses to provide actual functionality.
Args:
action: The action to perform (e.g., "OTA_PingRQ")
request_xml: The XML request body as string
version: The AlpineBits version
Returns:
AlpineBitsResponse with error or actual response
"""
return_string = f"Error: Action {action} not implemented"
return AlpineBitsResponse(return_string, HttpStatusCode.BAD_REQUEST)
async def check_version_supported(self, version: Version) -> bool:
"""Check if the action supports the given version.
Args:
version: The AlpineBits version to check
Returns:
True if supported, False otherwise
"""
if isinstance(self.version, list):
return version in self.version
return version == self.version
class ServerCapabilities:
"""Automatically discovers AlpineBitsAction implementations and generates capabilities."""
def __init__(self):
self.action_registry: dict[AlpineBitsActionName, type[AlpineBitsAction]] = {}
self._discover_actions()
self.capability_dict = None
def _discover_actions(self):
"""Discover all AlpineBitsAction implementations in the current module."""
current_module = inspect.getmodule(self)
for _name, obj in inspect.getmembers(current_module):
if (
inspect.isclass(obj)
and issubclass(obj, AlpineBitsAction)
and obj != AlpineBitsAction
):
# Check if this action is actually implemented (not just returning default)
if self._is_action_implemented(obj):
action_instance = obj()
if hasattr(action_instance, "name"):
# Use capability attribute as registry key
self.action_registry[action_instance.name] = obj
def _is_action_implemented(self, action_class: type[AlpineBitsAction]) -> bool:
"""Check if an action is actually implemented or just uses the default behavior.
This is a simple check - in practice, you might want more sophisticated detection.
"""
return "handle" in action_class.__dict__
def create_capabilities_dict(self) -> None:
"""Generate the capabilities dictionary based on discovered actions."""
versions_dict = {}
for action_enum, action_class in self.action_registry.items():
action_instance = action_class()
# Get supported versions for this action
if isinstance(action_instance.version, list):
supported_versions = action_instance.version
else:
supported_versions = [action_instance.version]
# Add action to each supported version
for version in supported_versions:
version_str = version.value
if version_str not in versions_dict:
versions_dict[version_str] = {"version": version_str, "actions": []}
action_dict = {"action": action_enum.capability_name}
# Add supports field if the action has custom supports
if hasattr(action_instance, "supports") and action_instance.supports:
action_dict["supports"] = action_instance.supports
versions_dict[version_str]["actions"].append(action_dict)
self.capability_dict = {"versions": list(versions_dict.values())}
# filter duplicates in actions for each version
for version in self.capability_dict["versions"]:
seen_actions = set()
unique_actions = []
for action in version["actions"]:
if action["action"] not in seen_actions:
seen_actions.add(action["action"])
unique_actions.append(action)
version["actions"] = unique_actions
# remove action_OTA_Ping from version 2024-10
for version in self.capability_dict["versions"]:
if version["version"] == "2024-10":
version["actions"] = [
action
for action in version["actions"]
if action.get("action") != "action_OTA_Ping"
]
def get_capabilities_dict(self) -> dict:
"""Get capabilities as a dictionary. Generates if not already created."""
if self.capability_dict is None:
self.create_capabilities_dict()
return self.capability_dict
def get_supported_actions(self) -> list[str]:
"""Get list of all supported action names."""
return list(self.action_registry.keys())
# Sample Action Implementations for demonstration
class PingAction(AlpineBitsAction):
"""Implementation for OTA_Ping action (handshaking)."""
def __init__(self, config: dict = {}):
self.name = AlpineBitsActionName.OTA_PING
self.version = [
Version.V2024_10,
Version.V2022_10,
] # Supports multiple versions
self.config = config
@override
async def handle(
self,
action: str,
request_xml: str,
version: Version,
client_info: AlpineBitsClientInfo,
server_capabilities: None | ServerCapabilities = None,
) -> AlpineBitsResponse:
"""Handle ping requests."""
if request_xml is None:
return AlpineBitsResponse(
"Error: Xml Request missing", HttpStatusCode.BAD_REQUEST
)
if server_capabilities is None:
return AlpineBitsResponse(
"Error: Something went wrong", HttpStatusCode.INTERNAL_SERVER_ERROR
)
# Parse the incoming request XML and extract EchoData
parser = XmlParser()
try:
parsed_request = parser.from_string(request_xml, OtaPingRq)
echo_data_client = json.loads(parsed_request.echo_data)
except Exception:
return AlpineBitsResponse(
"Error: Invalid XML request", HttpStatusCode.BAD_REQUEST
)
# compare echo data with capabilities, create a dictionary containing the matching capabilities
capabilities_dict = server_capabilities.get_capabilities_dict()
_LOGGER.debug("Capabilities of Server: %s", capabilities_dict)
matching_capabilities = {"versions": []}
# Iterate through client's requested versions
for client_version in echo_data_client.get("versions", []):
client_version_str = client_version.get("version", "")
# Find matching server version
for server_version in capabilities_dict["versions"]:
if server_version["version"] == client_version_str:
# Found a matching version, now find common actions
matching_version = {"version": client_version_str, "actions": []}
# Get client's requested actions for this version
client_actions = {
action.get("action", ""): action
for action in client_version.get("actions", [])
}
server_actions = {
action.get("action", ""): action
for action in server_version.get("actions", [])
}
# Find common actions
for action_name in client_actions:
if action_name in server_actions:
# Use server's action definition (includes our supports)
matching_version["actions"].append(
server_actions[action_name]
)
# Only add version if there are common actions
if matching_version["actions"]:
matching_capabilities["versions"].append(matching_version)
break
# Debug print to see what we matched
# Create successful ping response with matched capabilities
capabilities_json_str = dump_json_for_xml(matching_capabilities)
warning = OtaPingRs.Warnings.Warning(
status=WarningStatus.ALPINEBITS_HANDSHAKE,
type_value="11",
content=[capabilities_json_str],
)
warning_response = OtaPingRs.Warnings(warning=[warning])
client_response_echo_data = parsed_request.echo_data
response_ota_ping = OtaPingRs(
version="7.000",
warnings=warning_response,
echo_data=client_response_echo_data,
success="",
)
config = SerializerConfig(
pretty_print=True, xml_declaration=True, encoding="UTF-8"
)
serializer = XmlSerializer(config=config)
response_xml = serializer.render(
response_ota_ping, ns_map={None: "http://www.opentravel.org/OTA/2003/05"}
)
return AlpineBitsResponse(response_xml, HttpStatusCode.OK)
def strip_control_chars(s):
# Remove all control characters (ASCII < 32 and DEL)
return re.sub(r"[\x00-\x1F\x7F]", "", s)
def validate_hotel_authentication(
username: str, password: str, hotelid: str, config: dict
) -> bool:
"""Validate hotel authentication based on username, password, and hotel ID.
Example config
alpine_bits_auth:
- hotel_id: "123"
hotel_name: "Frangart Inn"
username: "alice"
password: !secret ALICE_PASSWORD
"""
if not config or "alpine_bits_auth" not in config:
return False
auth_list = config["alpine_bits_auth"]
for auth in auth_list:
if (
auth.get("hotel_id") == hotelid
and auth.get("username") == username
and auth.get("password") == password
):
return True
return False
# look for hotelid in config
class ReadAction(AlpineBitsAction):
"""Implementation for OTA_Read action."""
def __init__(self, config: dict = {}):
self.name = AlpineBitsActionName.OTA_READ
self.version = [Version.V2024_10, Version.V2022_10]
self.config = config
async def handle(
self,
action: str,
request_xml: str,
version: Version,
client_info: AlpineBitsClientInfo,
dbsession=None,
server_capabilities=None,
) -> AlpineBitsResponse:
"""Handle read requests."""
clean_action = strip_control_chars(str(action)).strip()
clean_expected = strip_control_chars(self.name.value[1]).strip()
if clean_action != clean_expected:
return AlpineBitsResponse(
f"Error: Invalid action {action}, expected {self.name.value[1]}",
HttpStatusCode.BAD_REQUEST,
)
if dbsession is None:
return AlpineBitsResponse(
"Error: Something went wrong", HttpStatusCode.INTERNAL_SERVER_ERROR
)
read_request = XmlParser().from_string(request_xml, OtaReadRq)
hotel_read_request = read_request.read_requests.hotel_read_request
hotelid = hotel_read_request.hotel_code
hotelname = hotel_read_request.hotel_name
if hotelname is None:
hotelname = "unknown"
if hotelid is None:
return AlpineBitsResponse(
"Error: Unauthorized Read Request. No target hotel specified. Check credentials",
HttpStatusCode.UNAUTHORIZED,
)
if not validate_hotel_authentication(
client_info.username, client_info.password, hotelid, self.config
):
return AlpineBitsResponse(
f"Error: Unauthorized Read Request for this specific hotel {hotelname}. Check credentials",
HttpStatusCode.UNAUTHORIZED,
)
start_date = None
"""When given, the server will send only inquiries generated after the Start timestamp, regardless
whether the client has retrieved them before or not."""
if hotel_read_request.selection_criteria is not None:
start_date = datetime.fromisoformat(
hotel_read_request.selection_criteria.start
)
# Use ReservationService to query reservations
reservation_service = ReservationService(dbsession)
if start_date:
_LOGGER.info("Filtering reservations from start date %s", start_date)
reservation_customer_pairs = (
await reservation_service.get_reservations_with_filters(
start_date=start_date, hotel_code=hotelid
)
)
elif client_info.username or client_info.client_id:
# Remove reservations that have been acknowledged via username (preferred) or client_id
reservation_customer_pairs = (
await reservation_service.get_unacknowledged_reservations(
username=client_info.username,
client_id=client_info.client_id,
hotel_code=hotelid
)
)
else:
reservation_customer_pairs = (
await reservation_service.get_reservations_with_filters(
hotel_code=hotelid
)
)
_LOGGER.info(
"Querying reservations and customers for hotel %s from database",
hotelid,
)
for reservation, customer in reservation_customer_pairs:
_LOGGER.info(
"Retrieving reservation %s for customer %s %s",
reservation.id,
customer.given_name,
customer.surname,
)
res_retrive_rs = create_res_retrieve_response(
reservation_customer_pairs, config=self.config
)
config = SerializerConfig(
pretty_print=True, xml_declaration=True, encoding="UTF-8"
)
serializer = XmlSerializer(config=config)
response_xml = serializer.render(
res_retrive_rs, ns_map={None: "http://www.opentravel.org/OTA/2003/05"}
)
return AlpineBitsResponse(response_xml, HttpStatusCode.OK)
class NotifReportReadAction(AlpineBitsAction):
"""Necessary for read action to follow specification. Clients need to report acknowledgements."""
def __init__(self, config: dict = {}):
self.name = AlpineBitsActionName.OTA_HOTEL_NOTIF_REPORT
self.version = [Version.V2024_10, Version.V2022_10]
self.config = config
async def handle(
self,
action: str,
request_xml: str,
version: Version,
client_info: AlpineBitsClientInfo,
dbsession=None,
server_capabilities=None,
) -> AlpineBitsResponse:
"""Handle read requests."""
notif_report = XmlParser().from_string(request_xml, OtaNotifReportRq)
# we can't check hotel auth here, because this action does not contain hotel info
warnings = notif_report.warnings
notif_report_details = notif_report.notif_details
success_message = OtaNotifReportRs(version="7.000", success="")
if client_info.client_id is None:
return AlpineBitsResponse(
"ERROR:no valid client id provided", HttpStatusCode.BAD_REQUEST
)
config = SerializerConfig(
pretty_print=True, xml_declaration=True, encoding="UTF-8"
)
serializer = XmlSerializer(config=config)
response_xml = serializer.render(
success_message, ns_map={None: "http://www.opentravel.org/OTA/2003/05"}
)
if (warnings is None and notif_report_details is None) or (
notif_report_details is not None
and notif_report_details.hotel_notif_report is None
):
return AlpineBitsResponse(
response_xml, HttpStatusCode.OK
) # Nothing to process
if dbsession is None:
return AlpineBitsResponse(
"Error: Something went wrong", HttpStatusCode.INTERNAL_SERVER_ERROR
)
# Use ReservationService to record acknowledgements
reservation_service = ReservationService(dbsession)
for entry in (
notif_report_details.hotel_notif_report.hotel_reservations.hotel_reservation
): # type: ignore
md5_unique_id = entry.unique_id.id
await reservation_service.record_acknowledgement(
client_id=client_info.client_id, unique_id=md5_unique_id, username=client_info.username
)
return AlpineBitsResponse(response_xml, HttpStatusCode.OK)
class PushAction(AlpineBitsAction):
"""Creates the necessary xml for OTA_HotelResNotif:GuestRequests."""
def __init__(self, config: dict = {}):
self.name = AlpineBitsActionName.OTA_HOTEL_RES_NOTIF_GUEST_REQUESTS
self.version = [Version.V2024_10, Version.V2022_10]
self.config = config
async def handle(
self,
action: str,
request_xml: tuple[Reservation, Customer],
version: Version,
client_info: AlpineBitsClientInfo,
dbsession=None,
server_capabilities=None,
) -> AlpineBitsResponse:
"""Create push request XML."""
xml_push_request = create_res_notif_push_message(
request_xml, config=self.config
)
config = SerializerConfig(
pretty_print=True, xml_declaration=True, encoding="UTF-8"
)
serializer = XmlSerializer(config=config)
xml_push_request = serializer.render(
xml_push_request, ns_map={None: "http://www.opentravel.org/OTA/2003/05"}
)
return AlpineBitsResponse(xml_push_request, HttpStatusCode.OK)
class AlpineBitsServer:
"""Asynchronous AlpineBits server for handling hotel data exchange requests.
This server handles various OTA actions and implements the AlpineBits protocol
for hotel data exchange. It maintains a registry of supported actions and
their capabilities, and can respond to handshake requests with its capabilities.
"""
def __init__(self, config: dict | None = None):
self.capabilities = ServerCapabilities()
self._action_instances = {}
self.config = config
self._initialize_action_instances()
def _initialize_action_instances(self):
"""Initialize instances of all discovered action classes."""
for capability_name, action_class in self.capabilities.action_registry.items():
_LOGGER.info(f"Initializing action instance for {capability_name}")
self._action_instances[capability_name] = action_class(config=self.config)
def get_capabilities(self) -> dict:
"""Get server capabilities."""
return self.capabilities.get_capabilities_dict()
async def handle_request(
self,
request_action_name: str,
request_xml: str | tuple[Reservation, Customer],
client_info: AlpineBitsClientInfo,
version: str = "2024-10",
dbsession=None,
) -> AlpineBitsResponse:
"""Handle an incoming AlpineBits request by routing to appropriate action handler.
Args:
request_action_name: The action name from the request (e.g., "OTA_Read:GuestRequests")
request_xml: The XML request body. Gets passed to the action handler. In case of PushRequest can be the data to be pushed
version: The AlpineBits version (defaults to "2024-10")
Returns:
AlpineBitsResponse with the result
"""
# Convert string version to enum
try:
version_enum = Version(version)
except ValueError:
return AlpineBitsResponse(
f"Error: Unsupported version {version}", HttpStatusCode.BAD_REQUEST
)
# Find the action by request name
action_enum = AlpineBitsActionName.get_by_request_name(request_action_name)
_LOGGER.info(
f"Handling request for action: {request_action_name} with action enum: {action_enum}"
)
if not action_enum:
return AlpineBitsResponse(
f"Error: Unknown action {request_action_name}",
HttpStatusCode.BAD_REQUEST,
)
# Check if we have an implementation for this action
if action_enum not in self._action_instances:
return AlpineBitsResponse(
f"Error: Action {request_action_name} is not implemented",
HttpStatusCode.BAD_REQUEST,
)
action_instance: AlpineBitsAction = self._action_instances[action_enum]
# Check if the action supports the requested version
if not await action_instance.check_version_supported(version_enum):
return AlpineBitsResponse(
f"Error: Action {request_action_name} does not support version {version}",
HttpStatusCode.BAD_REQUEST,
)
# Handle the request
try:
# Special case for ping action - pass server capabilities
if action_enum == AlpineBitsActionName.OTA_HOTEL_RES_NOTIF_GUEST_REQUESTS:
action_instance: PushAction
if request_xml is None or not isinstance(request_xml, tuple):
return AlpineBitsResponse(
"Error: Invalid data for push request",
HttpStatusCode.BAD_REQUEST,
)
return await action_instance.handle(
action=request_action_name,
request_xml=request_xml,
version=version_enum,
client_info=client_info,
)
if action_enum == AlpineBitsActionName.OTA_PING:
return await action_instance.handle(
action=request_action_name,
request_xml=request_xml,
version=version_enum,
server_capabilities=self.capabilities,
client_info=client_info,
)
return await action_instance.handle(
action=request_action_name,
request_xml=request_xml,
version=version_enum,
dbsession=dbsession,
client_info=client_info,
)
except Exception as e:
# print stack trace for debugging
import traceback
traceback.print_exc()
return AlpineBitsResponse(
f"Error: Internal server error while processing {request_action_name}: {e!s}",
HttpStatusCode.INTERNAL_SERVER_ERROR,
)
def get_supported_request_names(self) -> list[str]:
"""Get all supported request names (not capability names)."""
request_names = []
for capability_name in self._action_instances:
action_enum = AlpineBitsActionName.get_by_capability_name(capability_name)
if action_enum:
request_names.append(action_enum.request_name)
return sorted(request_names)
def is_action_supported(
self, request_action_name: str, version: str | None = None
) -> bool:
"""Check if a request action is supported.
Args:
request_action_name: The request action name (e.g., "OTA_Read:GuestRequests")
version: Optional version to check
Returns:
True if supported, False otherwise
"""
action_enum = AlpineBitsActionName.get_by_request_name(request_action_name)
if not action_enum:
return False
capability_name = action_enum.capability_name
if capability_name not in self._action_instances:
return False
if version:
try:
version_enum = Version(version)
action_instance = self._action_instances[capability_name]
# This would need to be async, but for simplicity we'll just check if version exists
if isinstance(action_instance.version, list):
return version_enum in action_instance.version
return action_instance.version == version_enum
except ValueError:
return False
return True
# Ensure FreeRoomsAction is registered with ServerCapabilities discovery
from .free_rooms_action import FreeRoomsAction # noqa: E402,F401