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