ref: 9dba115d62fda3ad59a77b837763327faef695b3
research/scraper.py
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#!/bin/python """ js interface: http://www.ztm.poznan.pl/themes/ztm/dist/js/app.js nodes: http://www.ztm.poznan.pl/goeuropa-api/all-nodes stops in node: http://www.ztm.poznan.pl/goeuropa-api/node_stops/{node:symbol} stops: http://www.ztm.poznan.pl/goeuropa-api/stops-nodes bike stations: http://www.ztm.poznan.pl/goeuropa-api/bike-stations """ import json import hashlib import os import re import sqlite3 import sys import time import requests from bs4 import BeautifulSoup import secrets def remove_options(text): return re.sub('(<select[^>]*>([^<]*<option[^>]*>[^<]*</option>)+[^<]*</select>)','', text) def get_validity(): """ get timetable validity """ session = requests.session() index = session.get('https://www.ztm.poznan.pl/goeuropa-api/index', verify='bundle.pem') option = re.search('<option value="[0-9]{8}" selected', index.text).group() return option.split('"')[1] def get_nodes(checksum): """ get nodes """ session = requests.session() index = session.get('https://www.ztm.poznan.pl/goeuropa-api/all-nodes', verify='bundle.pem') new_checksum = hashlib.sha512(index.text.encode('utf-8')).hexdigest() if checksum == new_checksum: return None return [(stop['symbol'], stop['name']) for stop in json.loads(index.text)], new_checksum def get_stops(node, checksum): """ get stops """ session = requests.session() index = session.get('https://www.ztm.poznan.pl/goeuropa-api/node_stops/{}'.format(node), verify='bundle.pem') new_checksum = hashlib.sha512(index.text.encode('utf-8')).hexdigest() if checksum == new_checksum: return None stops = [] for stop in json.loads(index.text): stop_id = stop['stop']['id'] number = re.findall("\\d+", stop['stop']['symbol'])[0] lat = stop['stop']['lat'] lon = stop['stop']['lon'] directions = ', '.join(['{} → {}'.format(transfer['name'], transfer['headsign']) for transfer in stop['transfers']]) stops.append((stop_id, node, number, lat, lon, directions)) return stops, new_checksum def get_lines(checksum): """ get lines """ session = requests.session() index = session.get('https://www.ztm.poznan.pl/goeuropa-api/index', verify='bundle.pem') index = re.sub('route-modal-[0-9a-f]{7}', '', index.text) index = remove_options(index) new_checksum = hashlib.sha512(index.encode('utf-8')).hexdigest() if new_checksum == checksum: return None soup = BeautifulSoup(index, 'html.parser') lines = {line['data-lineid']: line.text for line in soup.findAll(attrs={'class': re.compile(r'.*\blineNo-bt\b.*')})} return lines, new_checksum def get_route(line_id): """ get routes """ session = requests.session() index = session.get('https://www.ztm.poznan.pl/goeuropa-api/line-info/{}'.format(line_id), verify='bundle.pem') soup = BeautifulSoup(index.text, 'html.parser') directions = soup.findAll(attrs={'class': re.compile(r'.*\baccordion-item\b.*')}) routes = {} for direction in directions: direction_id = direction['data-directionid'] route = [{'id': stop.find('a')['data-stopid'], 'name': stop['data-name'], 'onDemand': re.search('stop-onDemand', str(stop['class'])) != None} for stop in direction.findAll(attrs={'class': re.compile(r'.*\bstop-itm\b.*')})] routes[direction_id] = route return routes def get_stop_times(stop_id, line_id, direction_id, checksum): """ get timetable """ session = requests.session() index = session.post('https://www.ztm.poznan.pl/goeuropa-api/stop-info/{}/{}'. format(stop_id, line_id), data={'directionId': direction_id}, verify='bundle.pem') index = re.sub('route-modal-[0-9a-f]{7}', '', index.text) index = remove_options(index) new_checksum = hashlib.sha512(index.encode('utf-8')).hexdigest() if new_checksum == checksum: return None soup = BeautifulSoup(index, 'html.parser') legends = {} for row in soup.find(attrs={'class': re.compile(r'.*\blegend-box\b.*')}).findAll('li'): row = row.text.split('-') row[0] = row[0].rstrip() row[1] = row[1].lstrip() if row[0] != '_': legends[row[0]] = '-'.join(row[1:]) schedules = {} for mode in soup.findAll(attrs={'class': re.compile(r'.*\bmode-tab\b.*')}): mode_name = mode['data-mode'] schedule = {row.find('th').text: [ {'time': minute.text, 'lowFloor': re.search('n-line', str(minute['class'])) != None} for minute in row.findAll('a')] for row in mode.find(attrs={'class': re.compile(r'.*\bscheduler-hours\b.*')}). findAll('tr')} schedule_2 = {hour: times for hour, times in schedule.items() if times != []} schedule = [] for hour, deps in schedule_2.items(): for dep in deps: schedule.append((hour, *describe(dep['time'], legends), dep['lowFloor'])) schedules[mode_name] = schedule return schedules, new_checksum def describe(dep_time, legend): """ describe departure """ desc = [] while re.match('^\\d+$', dep_time) is None: if dep_time[-1] != ',': desc.append(legend[dep_time[-1]]) dep_time = dep_time[:-1] return (int(dep_time), '; '.join(desc)) def main(): """ main function """ updating = False changed = False if os.path.exists('timetable.db'): updating = True with sqlite3.connect('timetable.db') as connection: try: cursor = connection.cursor() if updating: cursor.execute("select value from metadata where key = 'validFrom'") current_valid_from = cursor.fetchone()[0] if get_validity() <= current_valid_from: return 304 else: cursor.execute('create table metadata(key TEXT PRIMARY KEY, value TEXT)') cursor.execute('create table checksums(checksum TEXT, for TEXT, id TEXT)') cursor.execute('create table nodes(symbol TEXT PRIMARY KEY, name TEXT)') cursor.execute('create table stops(id TEXT PRIMARY KEY, symbol TEXT \ references node(symbol), number TEXT, lat REAL, lon REAL, \ headsigns TEXT)') cursor.execute('create table lines(id TEXT PRIMARY KEY, number TEXT)') cursor.execute('create table timetables(id TEXT PRIMARY KEY, stop_id TEXT references stop(id), \ line_id TEXT references line(id), headsign TEXT)') cursor.execute('create table departures(id INTEGER PRIMARY KEY, \ timetable_id TEXT references timetable(id), \ hour INTEGER, minute INTEGER, mode TEXT, \ lowFloor INTEGER, modification TEXT)') cursor.execute("delete from metadata where key = 'validFrom'") validity = get_validity() print(validity) cursor.execute("insert into metadata values('validFrom', ?)", (validity,)) cursor.execute("select checksum from checksums where for = 'nodes'") checksum = cursor.fetchone() if checksum != None: checksum = checksum[0] else: checksum = '' nodes_result = get_nodes(checksum) if nodes_result is not None: nodes, checksum = nodes_result cursor.execute('delete from nodes') cursor.execute("delete from checksums where for = 'nodes'") cursor.execute("insert into checksums values(?, 'nodes', null)", (checksum,)) # update cursor.executemany('insert into nodes values(?, ?)', nodes) changed = True else: cursor.execute('select * from nodes') nodes = cursor.fetchall() nodes = [(sym, nam) for sym, nam, _ in nodes] nodes_no = len(nodes) node_i = 1 for symbol, _ in nodes: sys.stdout.flush() cursor.execute("select checksum from checksums where for = 'node' and id = ?", (symbol,)) checksum = cursor.fetchone() if checksum != None: checksum = checksum[0] else: checksum = '' stops_result = get_stops(symbol, checksum) if stops_result is not None: stops, checksum = stops_result cursor.execute('delete from stops where symbol = ?', (symbol,)) cursor.executemany('insert into stops values(?, ?, ?, ?, ?, ?)', stops) cursor.execute("update checksums set checksum = ? where for = 'node' and id = ?", (checksum, symbol)) changed = True node_i += 1 cursor.execute("select checksum from checksums where for = 'lines'") checksum = cursor.fetchone() if checksum != None: checksum = checksum[0] else: checksum = '' lines_result = get_lines(checksum) if lines_result is not None: lines, checksum = lines_result cursor.execute('delete from lines') cursor.execute("delete from checksums where for = 'lines'") cursor.execute("insert into checksums values(?, 'lines', null)", (checksum,)) # update cursor.executemany('insert into lines values(?, ?)', lines.items()) changed = True else: cursor.execute('select * from lines') lines = cursor.fetchall() lines_no = len(lines) line_i = 1 for line_id, _ in lines.items(): route = get_route(line_id) routes_no = len(route) route_i = 1 for direction, stops in route.items(): stops_no = len(stops) stop_i = 1 for stop in stops: timetable_id = secrets.token_hex(4) sys.stdout.flush() cursor.execute("select checksum from checksums where for = 'timetable' and id = ?", (timetable_id,)) checksum = cursor.fetchone() if checksum != None: checksum = checksum[0] else: checksum = '' stop_times = get_stop_times(stop['id'], line_id, direction, checksum) if stop_times is not None: timetables, checksum = stop_times cursor.execute('delete from timetables where line_id = ? and stop_id = ?', (line_id, stop['id'])) cursor.execute('insert into timetables values(?, ?, ?, ?)', (timetable_id, stop['id'], line_id, stops[-1]['name'])) cursor.execute("insert into checksums values(?, 'timetable', ?)", (checksum, timetable_id)) changed = True cursor.execute('delete from departures where timetable_id = ?', (timetable_id,)) for mode, times in timetables.items(): cursor.executemany('insert into departures values(null, ?, ?, ?, ?, ?, \ ?)', [(timetable_id, hour, minute, mode, lowfloor, desc) for hour, minute, desc, lowfloor in times]) stop_i += 1 sys.stdout.flush() route_i += 1 line_i += 1 except KeyboardInterrupt: return 404 if changed: return 0 return 304 if __name__ == '__main__': exit(main()) |