266 lines
7.7 KiB
Python
Executable file
266 lines
7.7 KiB
Python
Executable file
#!/usr/bin/python3
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"""Reverse geocode: convert lat/lon to Wikidata item & Wikimedia Commons category."""
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import random
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import typing
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import sqlalchemy.exc
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from flask import Flask, jsonify, redirect, render_template, request, url_for
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from sqlalchemy.orm.query import Query
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from werkzeug.wrappers import Response
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import geocode
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from geocode import database, model, scotland, wikidata
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city_of_london_qid = "Q23311"
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app = Flask(__name__)
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app.config.from_object("config.default")
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database.init_app(app)
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Tags = typing.Mapping[str, str]
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def get_random_lat_lon() -> tuple[float, float]:
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"""Select random lat/lon within the UK."""
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south, east = 50.8520, 0.3536
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north, west = 53.7984, -2.7296
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mul = 10000
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lat = random.randrange(int(south * mul), int(north * mul)) / mul
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lon = random.randrange(int(west * mul), int(east * mul)) / mul
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return lat, lon
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def do_lookup(
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elements: "Query[model.Polygon]", lat: str | float, lon: str | float
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) -> wikidata.WikidataDict:
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"""Do lookup."""
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try:
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hit = osm_lookup(elements, lat, lon)
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except wikidata.QueryError as e:
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return {
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"query": e.query,
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"error": e.r.text,
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"query_url": "https://query.wikidata.org/#" + e.query,
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}
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return wikidata.build_dict(hit, lat, lon)
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def lat_lon_to_wikidata(lat: str | float, lon: str | float) -> dict[str, typing.Any]:
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"""Lookup lat/lon and find most appropriate Wikidata item."""
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scotland_code = scotland.get_scotland_code(lat, lon)
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elements: typing.Any
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if scotland_code:
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rows = wikidata.lookup_scottish_parish_in_wikidata(scotland_code)
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hit = wikidata.commons_from_rows(rows)
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elements = []
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result = wikidata.build_dict(hit, lat, lon)
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return {"elements": elements, "result": result}
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elements = model.Polygon.coords_within(lat, lon)
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result = do_lookup(elements, lat, lon)
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# special case because the City of London is admin_level=6 in OSM
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if result.get("wikidata") == city_of_london_qid:
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return {"elements": elements, "result": result}
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admin_level = result.get("admin_level")
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if not admin_level:
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return {"elements": elements, "result": result}
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assert isinstance(admin_level, int)
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if admin_level >= 7:
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return {"elements": elements, "result": result}
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row = wikidata.geosearch(lat, lon)
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if row:
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hit = wikidata.commons_from_rows([row])
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elements = []
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result = wikidata.build_dict(hit, lat, lon)
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return {"elements": elements, "result": result}
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def get_admin_level(tags: Tags) -> int | None:
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"""Read admin_level from tags."""
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admin_level_tag = tags.get("admin_level")
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return (
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int(admin_level_tag) if admin_level_tag and admin_level_tag.isdigit() else None
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)
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def hit_from_wikidata_tag(tags: Tags) -> wikidata.Hit | None:
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"""Check element for a wikidata tag."""
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return (
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{
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"wikidata": qid,
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"commons_cat": commons,
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}
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if "wikidata" in tags
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and (commons := wikidata.qid_to_commons_category(qid := tags["wikidata"]))
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else None
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)
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def hit_from_ref_gss_tag(tags: Tags) -> wikidata.Hit | None:
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"""Check element for rss:gss tag."""
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gss = tags.get("ref:gss")
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return wikidata.get_commons_cat_from_gss(gss) if gss else None
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def hit_from_name(
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tags: Tags, lat: str | float, lon: str | float
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) -> wikidata.Hit | None:
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"""Use name to look for hit."""
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if not (name := tags.get("name")):
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return None
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if name.endswith(" CP"): # civil parish
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name = name[:-3]
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rows = wikidata.lookup_wikidata_by_name(name, lat, lon)
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return wikidata.commons_from_rows(rows) if len(rows) == 1 else None
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def osm_lookup(
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elements: "Query[model.Polygon]", lat: str | float, lon: str | float
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) -> wikidata.Hit | None:
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"""OSM lookup."""
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ret: wikidata.Hit | None
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for e in elements:
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assert isinstance(e, model.Polygon)
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assert e.tags
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tags: typing.Mapping[str, str] = e.tags
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admin_level: int | None = get_admin_level(tags)
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if not admin_level and tags.get("boundary") not in ("political", "place"):
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continue
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if not (
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(hit := hit_from_wikidata_tag(tags))
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or (hit := hit_from_ref_gss_tag(tags))
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or (hit := hit_from_name(tags, lat, lon))
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):
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continue
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hit["admin_level"] = admin_level
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hit["element"] = e.osm_id
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hit["geojson"] = typing.cast(str, e.geojson_str)
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return hit
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has_wikidata_tag = [e for e in elements if e.tags.get("wikidata")]
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if len(has_wikidata_tag) != 1:
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return None
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e = has_wikidata_tag[0]
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assert e.tags
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qid = e.tags["wikidata"]
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return {
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"wikidata": qid,
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"element": e.osm_id,
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"geojson": typing.cast(str, e.geojson_str),
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"commons_cat": wikidata.qid_to_commons_category(qid),
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"admin_level": admin_level,
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}
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def redirect_to_detail(q: str) -> Response:
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"""Redirect to detail page."""
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lat, lon = [v.strip() for v in q.split(",", 1)]
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return redirect(url_for("detail_page", lat=lat, lon=lon))
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@app.errorhandler(sqlalchemy.exc.OperationalError)
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def handle_database_error(error: Exception) -> tuple[str, int]:
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"""Show error screen on database error."""
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return render_template("database_error.html"), 500
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@app.route("/")
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def index() -> str | Response:
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"""Index page."""
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database.session.execute("SELECT 1")
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q = request.args.get("q")
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if q and q.strip():
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return redirect_to_detail(q)
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lat, lon = request.args.get("lat"), request.args.get("lon")
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if lat is not None and lon is not None:
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result = lat_lon_to_wikidata(lat, lon)["result"]
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result.pop("element", None)
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result.pop("geojson", None)
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return jsonify(result)
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samples = sorted(geocode.samples, key=lambda row: row[2])
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return render_template("index.html", samples=samples)
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@app.route("/random")
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def random_location() -> str | Response:
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"""Return detail page for random lat/lon."""
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lat, lon = get_random_lat_lon()
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return build_detail_page(lat, lon)
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@app.route("/wikidata_tag")
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def wikidata_tag() -> str:
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"""Lookup Wikidata tag for lat/lon."""
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lat_str, lon_str = request.args["lat"], request.args["lon"]
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lat, lon = float(lat_str), float(lon_str)
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scotland_code = scotland.get_scotland_code(lat, lon)
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elements: typing.Any
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if scotland_code:
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rows = wikidata.lookup_scottish_parish_in_wikidata(scotland_code)
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hit = wikidata.commons_from_rows(rows)
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elements = []
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result = wikidata.build_dict(hit, lat, lon)
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else:
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elements = model.Polygon.coords_within(lat, lon)
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result = do_lookup(elements, lat, lon)
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return render_template(
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"wikidata_tag.html", lat=lat, lon=lon, result=result, elements=elements
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)
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def build_detail_page(lat: float, lon: float) -> str:
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"""Run lookup and build detail page."""
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try:
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reply = lat_lon_to_wikidata(lat, lon)
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except wikidata.QueryError as e:
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query, r = e.args
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return render_template("query_error.html", lat=lat, lon=lon, query=query, r=r)
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element = reply["result"].pop("element", None)
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geojson = reply["result"].pop("geojson", None)
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return render_template(
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"detail.html",
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lat=lat,
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lon=lon,
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str=str,
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element_id=element,
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geojson=geojson,
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**reply,
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)
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@app.route("/detail")
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def detail_page() -> Response | str:
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"""Detail page."""
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database.session.execute("SELECT 1")
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try:
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lat_str, lon_str = request.args["lat"], request.args["lon"]
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lat, lon = float(lat_str), float(lon_str)
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except TypeError:
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return redirect(url_for("index"))
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return build_detail_page(lat, lon)
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if __name__ == "__main__":
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app.run(host="0.0.0.0")
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