find_broken_buildings.py

import overpass
import json
from urllib.request import urlopen
from bs4 import BeautifulSoup
import argparse


def get_data_From_area(terc, user, date):
    query = """
[out:json]
[timeout:1200]
;
area
  ["boundary"="administrative"]
  ["admin_level"="9"]
  ["teryt:terc"="%s"]
  ["type"="boundary"]
->.boundryarea;
(
  way
    (changed:"%s")
    (user:"%s")
    (area.boundryarea)
    ["building"];
);
out meta bb qt;
""" % (
        terc,
        date,
        user,
    )
    return json.loads(overpass.query(query))


def xml_to_json(data):
    bs = BeautifulSoup(data)
    way = bs.find("way")
    element = dict(way.attrs)
    element["nodes"] = list(map(lambda x: int(x.get("ref")), way.find_all("nd")))
    element["tags"] = dict((x.get("k"), x.get("v")) for x in way.find_all("tag"))
    return element


def osm_api_get(url):
    url = "https://api.openstreetmap.org/%s" % (url,)
    return xml_to_json(urlopen(url))


def get_history(obj):
    ret = {}
    for i in obj["elements"]:
        ret[i["id"]] = osm_api_get(
            "/api/0.6/%s/%s/%s" % (i["type"], i["id"], int(i["version"]) - 1)
        )
    return ret


def main():
    parser = argparse.ArgumentParser(description="finds buildings with removed nodes")
    parser.add_argument("--terc", help="TERYT terc code for area", required=True)
    parser.add_argument("--user", help="User name doing changes", required=True)
    parser.add_argument(
        "--date", help="Date in ISO format, ex. 2015-10-01T00:00:00Z", required=True
    )
    args = parser.parse_args()

    ways = get_data_From_area(args.terc, args.user, args.date)
    history = get_history(ways)

    ret = []
    for i in ways["elements"]:
        if (
            len(set(i["nodes"]).symmetric_difference(set(history[i["id"]]["nodes"])))
            > 0
        ):
            ret.append(i["id"])
    print(",".join(map(str, ret)))


if __name__ == "__main__":
    main()