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#!/usr/bin/env python3
# vim:tabstop=4 softtabstop=4 shiftwidth=4 textwidth=160 smarttab expandtab colorcolumn=160
#
# Copyright (C) 2021 Daniel Friesel
#
# SPDX-License-Identifier: BSD-2-Clause
import argparse
import aiohttp
from aiohttp import web
from datetime import datetime
import dateutil.parser
from jinja2 import Environment, FileSystemLoader, select_autoescape
import json
import os
headers = {
"Access-Control-Allow-Origin": "*",
"Content-Type": "text/html; charset=utf-8",
}
ajax_headers = {
"Access-Control-Allow-Origin": "*",
"Content-Type": "application/json; charset=utf-8",
}
db_rest_api = os.getenv("NVM_DB_REST_API", "https://v5.db.transport.rest")
env = Environment(loader=FileSystemLoader("templates"), autoescape=select_autoescape())
class Departure:
def __init__(self, obj):
self.__dict__.update(obj)
if not "cancelled" in obj:
self.cancelled = False
self.classes = str()
self.station_name = None
self.stop_name = None
self.stop_name = obj.get("stop", dict()).get("name", None)
self.station_name = obj.get("station", dict()).get("name", self.stop_name)
if "," in self.direction:
self.direction, self.suffix = self.direction.split(",", maxsplit=1)
else:
self.suffix = None
if "line" in obj:
self.line = Line(self.line)
try:
self.when = dateutil.parser.parse(self.when)
except TypeError:
self.when = None
try:
self.plannedWhen = dateutil.parser.parse(self.plannedWhen)
except TypeError:
self.plannedWhen = None
if self.cancelled:
self.classes += " cancelled"
if self.when:
self.sort_by = self.when.timestamp()
elif self.plannedWhen:
self.sort_by = self.plannedWhen.timestamp()
else:
self.sort_by = 0
if self.delay:
self.delay = self.delay // 60
self.delay = f"{self.delay:+.0f}"
def set_relative(self, now):
minutes = (self.sort_by - now) // 60
if minutes < 1:
self.relativeWhen = "sofort"
elif minutes < 60:
self.relativeWhen = f"{minutes:.0f} min"
else:
self.relativeWhen = f"{minutes//60:.0f}h {minutes%60:.0f}min"
class Line:
def __init__(self, obj):
self.__dict__.update(obj)
self.css_class = str()
if self.product.startswith("national"):
self.css_class = "longdistance"
elif self.product == "tram":
# str.removeprefix requires Python ≥ 3.9
if self.name.startswith("STR "):
self.name = self.name[4:]
self.css_class = "tram"
elif self.product == "suburban":
self.css_class = "suburban"
elif self.product == "subway":
self.css_class = "subway"
elif self.product == "bus":
if self.name.startswith("Bus "):
self.name = self.name[4:]
self.css_class = "bus"
async def show_departure_board(request):
try:
eva = int(request.match_info.get("eva"))
except ValueError:
return web.HTTPBadRequest(text="EVA must be a number at the moment")
async with aiohttp.ClientSession() as session:
async with session.get(
f"{db_rest_api}/stops/{eva}/departures?results=60&duration=120&stopovers=true"
) as response:
departures = await response.json()
if type(departures) is dict and departures.get("error", False):
return web.HTTPNotFound(body=json.dumps(departures), headers=headers)
departures = list(map(Departure, departures))
station_name_freq = dict()
now = datetime.now().timestamp()
for departure in departures:
departure.set_relative(now)
station_name_freq[departure.station_name] = (
station_name_freq.get(departure.station_name, 0) + 1
)
if station_name_freq:
station_name = max(station_name_freq.keys(), key=lambda k: station_name_freq[k])
else:
station_name = "NVM"
departure_board = env.get_template("departure_list.html")
return web.Response(
body=departure_board.render(title=station_name, departures=departures),
headers=headers,
)
async def redirect_to_departure_board(request):
stop_name = request.query["name"]
async with aiohttp.ClientSession() as session:
async with session.get(
f"{db_rest_api}/locations?query={stop_name}&poi=false&addresses=false"
) as response:
stops = await response.json()
stops_page = env.get_template("stops.html")
return web.Response(
body=stops_page.render(title=f"Suche nach „{stop_name}“", stops=stops),
headers=headers,
)
async def show_landing_page(request):
landing_page = env.get_template("landing_page.html")
return web.Response(
body=landing_page.render(title="NVM"),
headers=headers,
)
async def ajax_geolocation(request):
request_data = await request.json()
lat = request_data["lat"]
lon = request_data["lon"]
async with aiohttp.ClientSession() as session:
async with session.get(
f"{db_rest_api}/stops/nearby?latitude={lat}&longitude={lon}"
) as response:
departures = await response.json()
return web.Response(
body=json.dumps(departures),
headers=ajax_headers,
)
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="eva to efa gateway")
parser.add_argument("--port", type=int, metavar="PORT", default=8080)
parser.add_argument("--prefix", type=str, metavar="PATH", default="/")
args = parser.parse_args()
app = web.Application()
app.router.add_get(args.prefix, show_landing_page)
app.router.add_get(f"{args.prefix}board/{{eva}}", show_departure_board)
app.router.add_post(f"{args.prefix}geolocation", ajax_geolocation)
app.router.add_get(f"{args.prefix}find/stop", redirect_to_departure_board)
app.router.add_static(f"{args.prefix}static", "static")
web.run_app(app, host="localhost", port=args.port)
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