343 lines
11 KiB
Python
343 lines
11 KiB
Python
import csv
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import json
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from dataclasses import dataclass
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from datetime import datetime
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from pathlib import Path
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from typing import Any
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import requests
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import typer
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BASE_URL = "https://www.nightjet.com"
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BASE_DIR = "out"
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CSV_LOWEST_FILE = "lowest.csv"
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CSV_ALL_PRICES_PATTERN = "all_prices_%%DATE%%.csv"
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NOTIFICATION_CHANNEL = "nightjet-price-notifier"
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START_STATION = "8096003" # BerlinHBF
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END_STATION = "8796001" # Paris Est
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TRAVEL_DATE = "2025-10-14"
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def dprint(txt) -> None:
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print(f"{datetime.now()}: {txt}")
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def request_init_token(endpoint: str = "/nj-booking-ocp/init/start") -> str:
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headers = {
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"Referer": "https://www.nightjet.com",
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"Content-Type": "application/json",
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}
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body = {"lang": "en"}
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resp_json = requests.post(
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f"{BASE_URL}{endpoint}", data=json.dumps(body), headers=headers
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).json()
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token = resp_json["token"]
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dprint(f"Received init token: {token}")
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return token
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def request_connections(
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token: str,
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start_station: int,
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end_station: int,
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travel_date: datetime,
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endpoint: str = "/nj-booking-ocp/connection",
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) -> list[Any]:
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uri = f"{BASE_URL}{endpoint}/{start_station}/{end_station}/{travel_date.strftime('%Y-%m-%d')}"
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headers = {
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"Accept": "application/json",
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"Accept-Language": "en-US,en;q=0.5",
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"Referer": "https://www.nightjet.com/en/ticket-buchen/",
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"x-token": token,
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"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0",
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}
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resp_json = requests.get(
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uri,
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headers=headers,
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).json()
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return resp_json["connections"]
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TRAVELLER_BIRTHDATE = "2000-07-15" # TODO: randomize a little
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def connection_data_to_booking_requests(connections) -> list[dict[str, Any]]:
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b_requests = []
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for c in connections:
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train = c["trains"][0]
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dep = train["departure"]["utc"]
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req = {
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"njFrom": c["from"]["number"], # from station,
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"njTo": c["to"]["number"], # to station
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"njDep": dep, # departure time,
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"maxChanges": 0,
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"connections": 1,
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"filter": {
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"njTrain": train["train"], # train number
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"njDeparture": dep, # departure time again
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},
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"objects": [ # traveller
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{"type": "person", "birthDate": TRAVELLER_BIRTHDATE, "cards": []}
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],
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"relations": [],
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"lang": "en",
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}
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b_requests.append(req)
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dprint(
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f"Crafted booking request {c['from']['name']} -> {c['to']['name']}: {train['departure']['local']}-{train['arrival']['local']}."
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)
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return b_requests
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def request_bookings(
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token: str, booking_req: dict[str, Any], endpoint: str = "/nj-booking-ocp/offer/get"
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) -> dict[Any, Any]:
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headers = {
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"Accept": "application/json",
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"Accept-Language": "en-US,en;q=0.5",
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"Content-Type": "application/json",
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"Referer": "https://www.nightjet.com/en/ticket-buchen/",
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"Origin": "https://www.nightjet.com",
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"x-token": token,
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"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0",
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}
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resp_json = requests.post(
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f"{BASE_URL}{endpoint}", headers=headers, data=json.dumps(booking_req)
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).json()
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dprint(
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f"Requested prices ({booking_req['njFrom']} -> {booking_req['njTo']} at {booking_req['njDep']})."
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)
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return resp_json
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def json_extract(obj, key):
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"""Recursively fetch values from nested JSON."""
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arr = []
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def extract(obj, arr, key):
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"""Recursively search for values of key in JSON tree."""
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if isinstance(obj, dict):
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for k, v in obj.items():
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if isinstance(v, (dict, list)):
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extract(v, arr, key)
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elif k == key:
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arr.append(v)
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elif isinstance(obj, list):
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for item in obj:
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extract(item, arr, key)
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return arr
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values = extract(obj, arr, key)
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return values
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@dataclass
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class Price:
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id: str
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name: str
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price: float
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dt_from: datetime
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dt_to: datetime
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def extract_prices(bookings_dict: list[dict[Any, Any]]) -> list[Price]:
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prices = []
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# .result[].connections[].offers[].reservation.reservationSegments[].compartments[].objects
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for booking in bookings_dict:
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for reservation in booking["result"]:
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for connection in reservation["connections"]:
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for offer in connection["offers"]:
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for reservation in offer["reservation"]["reservationSegments"]:
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for compartment in reservation["compartments"]:
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id = compartment["externalIdentifier"]
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name = compartment["name"]["en"]
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# filter undesired compartments
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if id in ["sideCorridorCoach_2"]:
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continue
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# print all compartment identifiers w/ full name
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# dprint(f"{id}: {name}")
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# only keep those with a price (i.e. bookable?)
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if "objects" not in compartment:
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continue
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price = compartment["objects"][0]["price"]
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prices.append(
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Price(
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id,
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name,
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price,
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dt_from=datetime.strptime(
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offer["validityPeriodFrom"],
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"%Y-%m-%dT%H:%M:%S.%f%z",
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),
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dt_to=datetime.strptime(
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offer["validityPeriodTo"],
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"%Y-%m-%dT%H:%M:%S.%f%z",
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),
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)
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)
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return prices
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def_time = datetime.fromtimestamp(0.0)
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def get_lowest_price(prices: list[Price]) -> Price:
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lowest = Price("", "", 10000000.0, def_time, def_time)
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for p in prices:
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if p.price < lowest.price:
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lowest = p
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return lowest
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def dump_all_prices_to_csv(prices: list[Price], fpath: Path) -> None:
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fstr = str(fpath)
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fpath_replaced = Path(
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fstr.replace("%%DATE%%", str(int(datetime.now().timestamp())))
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)
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with open(fpath_replaced, "w") as f:
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writer = csv.writer(f)
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writer.writerow(["id", "price", "ts_from", "ts_to", "name"])
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writer.writerows(
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[
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[
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price.id,
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price.price,
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price.dt_from.timestamp(),
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price.dt_to.timestamp(),
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price.name,
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]
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for price in prices
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]
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)
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dprint(f"Dumped current query snapshot into: {fpath_replaced}.")
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def add_to_csv(price: Price, file: Path) -> None:
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if not file.is_file():
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with open(file, "w") as f:
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csv.writer(f).writerow(["id", "price", "ts_from", "ts_to", "name"])
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with open(file, "a") as f:
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csv.writer(f).writerow(
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[
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price.id,
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price.price,
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price.dt_from.timestamp(),
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price.dt_to.timestamp(),
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price.name,
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]
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)
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def get_last_price_from_csv(file: Path) -> Price | None:
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if not file.is_file():
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return
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with open(file) as f:
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last = next(reversed(list(csv.reader(f))))
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return Price(
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id=last[0],
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price=float(last[1]),
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dt_from=datetime.fromtimestamp(float(last[2])),
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dt_to=datetime.fromtimestamp(float(last[3])),
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name=last[4],
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)
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def notify_user(previous: Price, new: Price, channel: str) -> None:
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requests.post(
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f"https://ntfy.sh/{channel}",
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data=f"from {previous.price} -> {new.price} ({new.name}: {new.dt_from.strftime('%Y-%m-%d %H:%M')} - {new.dt_to.strftime('%Y-%m-%d %H:%M')})",
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headers={
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"Title": f"Nightjet train price went {'down' if new.price < previous.price else 'up'}",
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"Priority": "urgent" if new.price < previous.price else "default",
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"Tags": "green_circle" if new.price < previous.price else "orange_circle",
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},
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)
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def query(start_station: int, end_station: int, travel_date: datetime) -> list[Price]:
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token = request_init_token()
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connections = request_connections(token, start_station, end_station, travel_date)
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booking_requests = connection_data_to_booking_requests(connections)
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bookings = [request_bookings(token, req) for req in booking_requests]
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prices = extract_prices(bookings)
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return prices
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## CLI
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app = typer.Typer()
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@app.command()
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def main(
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start_station: int = typer.Option(
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START_STATION, help="Departure station number. (default: Berlin Hbf)"
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),
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end_station: int = typer.Option(
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END_STATION, help="Destination station number. (default: Paris Est)"
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),
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travel_date: str = typer.Option(help="Travel day to search from. (YYYY-MM-DD)"),
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notification_channel: str = typer.Option(
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NOTIFICATION_CHANNEL, help="ntfy channel to inform user on."
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),
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base_output_directory: Path = typer.Option(
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Path(BASE_DIR), help="Directory in which to output all result files."
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),
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lowest_prices_filename: str = typer.Option(
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CSV_LOWEST_FILE, help="Filename for collecting lowest found prices."
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),
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price_snapshot_pattern: str = typer.Option(
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CSV_ALL_PRICES_PATTERN,
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help="Filename pattern for saving all prices of each query. Takes %%DATE%% as pattern to replace with current unix timestamp.",
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),
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dump_price_snapshot: bool = typer.Option(
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True, help="Dump _all_ queried prices into a timestamped csv file."
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),
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):
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base_output_directory.mkdir(exist_ok=True, parents=True)
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lowest_prices_path = base_output_directory.joinpath(lowest_prices_filename)
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price_snapshot_path = base_output_directory.joinpath(price_snapshot_pattern)
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try:
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date_obj = datetime.strptime(travel_date, "%Y-%m-%d")
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except ValueError:
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typer.echo(f"Invalid date format: {travel_date}. Use YYYY-MM-DD", err=True)
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raise typer.Exit(1)
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prices = query(
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start_station=start_station, end_station=end_station, travel_date=date_obj
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)
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# create a snapshot of all current prices
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if dump_price_snapshot:
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dump_all_prices_to_csv(prices, price_snapshot_path)
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# extract the lowest and the last lowest price
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new = get_lowest_price(prices)
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previous = get_last_price_from_csv(lowest_prices_path)
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# if the price changed, add it to lowest prices
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if not previous or new.price != previous.price:
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dprint(f"PRICE CHANGE. {previous} -> {new}")
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add_to_csv(new, lowest_prices_path)
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notify_user(
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previous
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or Price(
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"",
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"No previous price",
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0.0,
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datetime.fromtimestamp(0),
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datetime.fromtimestamp(0),
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),
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new,
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notification_channel,
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)
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if __name__ == "__main__":
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app()
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