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#!/usr/bin/env python3
# vim:tabstop=4 softtabstop=4 shiftwidth=4 textwidth=160 smarttab expandtab colorcolumn=160
#
# Copyright (C) 2021 Birte Kristina Friesel
#
# SPDX-License-Identifier: BSD-2-Clause
import argparse
import aiohttp
from aiohttp import web
from datetime import datetime
import json
headers = {
"Access-Control-Allow-Origin": "*",
"Content-Type": "application/json; charset=utf-8",
}
occupancy_map = {"MANY_SEATS": 1, "FEW_SEATS": 2, "STANDING_ONLY": 3}
occupancy_cache = dict()
eva_to_name = dict()
class EFA:
def __init__(self, url, proximity_search=False):
self.dm_url = url + "/XML_DM_REQUEST"
self.dm_post_data = {
"command": "",
"deleteAssignedStops_dm": "1",
"help": "Hilfe",
"itdLPxx_id_dm": ":dm",
"itdLPxx_mapState_dm": "",
"itdLPxx_mdvMap2_dm": "",
"itdLPxx_mdvMap_dm": "3406199:401077:NAV3",
"itdLPxx_transpCompany": "vrr",
"itdLPxx_view": "",
"language": "de",
"mode": "direct",
"nameInfo_dm": "invalid",
"nameState_dm": "empty",
"outputFormat": "JSON",
"ptOptionsActive": "1",
"requestID": "0",
"reset": "neue Anfrage",
"sessionID": "0",
"submitButton": "anfordern",
"typeInfo_dm": "invalid",
"type_dm": "stop",
"useProxFootSearch": "0",
"useRealtime": "1",
}
if proximity_search:
self.dm_post_data["useProxFootSearch"] = "1"
async def get_departures(self, place, name, ts):
self.dm_post_data.update(
{
"itdDateDay": ts.day,
"itdDateMonth": ts.month,
"itdDateYear": ts.year,
"itdTimeHour": ts.hour,
"itdTimeMinute": ts.minute,
"name_dm": name,
}
)
if place is None:
self.dm_post_data.pop("placeInfo_dm", None)
self.dm_post_data.pop("placeState_dm", None)
self.dm_post_data.pop("place_dm", None)
else:
self.dm_post_data.update(
{"placeInfo_dm": "invalid", "placeState_dm": "empty", "place_dm": place}
)
departures = list()
async with aiohttp.ClientSession() as session:
async with session.post(self.dm_url, data=self.dm_post_data) as response:
# EFA may return JSON with a text/html Content-Type, which response.json() does not like.
departures = json.loads(await response.text())
return departures
async def get_departures(request):
efa_url = request.query.get("url", None)
place = request.query.get("place", None)
name = request.query.get("name", None)
if not efa_url:
return web.HTTPBadRequest(text="missing url=... parameter")
if not name:
return web.HTTPBadRequest(text="missing name=... parameter")
now = datetime.now()
reply = await EFA(efa_url).get_departures(place, name, now)
return web.Response(body=json.dumps(reply), headers=headers)
def get_occupancy(occupancy):
try:
return occupancy_map[occupancy]
except KeyError:
return None
def build_occupancy_response(departure_list, eva, now):
train_data = dict()
for departure in departure_list:
try:
occupancy = departure["occupancy"]
train_no = departure["servingLine"]["trainNum"]
train_data[train_no] = {"occupancy": get_occupancy(occupancy)}
except KeyError:
pass
reply = {"train": train_data}
occupancy_cache[eva] = (now, reply)
return web.Response(body=json.dumps(reply), headers=headers)
async def get_occupancy_by_eva(request):
try:
eva = int(request.match_info.get("eva"))
except ValueError:
return web.HTTPBadRequest(text="EVA must be a number")
try:
station, optid = eva_to_name[eva]
except KeyError:
return web.HTTPNotFound(text="Unknown EVA")
now = datetime.now()
if eva in occupancy_cache and now.timestamp() - occupancy_cache[eva][0] < 300:
return web.Response(body=json.dumps(occupancy_cache[eva][1]), headers=headers)
reply = await EFA("https://app.vrr.de/standard").get_departures(None, station, now)
if reply.get("departureList", None):
return build_occupancy_response(reply["departureList"], eva, now.timestamp())
reply = await EFA(
"https://app.vrr.de/standard", proximity_search=True
).get_departures(None, optid, now)
return build_occupancy_response(
reply.get("departureList", list()), eva, now.timestamp()
)
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()
with open("share/vrr.json", "r") as f:
for eva, (name, optid) in json.load(f).items():
eva_to_name[int(eva)] = name, optid
app = web.Application()
# legacy route
app.add_routes([web.get(f"{args.prefix}{{eva}}.json", get_occupancy_by_eva)])
app.add_routes([web.get(f"{args.prefix}departures", get_departures)])
app.add_routes(
[web.get(f"{args.prefix}occupancy-by-eva/{{eva}}.json", get_occupancy_by_eva)]
)
web.run_app(app, host="localhost", port=args.port)
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