mohamad
d4ec85add4
Add independent map profiles, offline city lookup, bundled world artwork and collision-free portrait placement with optional person details. Deploy with updated requirements, migrations 0029-0031 and collectstatic.
36 lines
1.5 KiB
Python
36 lines
1.5 KiB
Python
"""Offline city resolution. No requests or personal data leave the server."""
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from functools import lru_cache
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import unicodedata
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from django.core.exceptions import ValidationError
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def normalize(value):
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return ''.join(c for c in unicodedata.normalize('NFKD', value.casefold().strip()) if not unicodedata.combining(c))
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@lru_cache(maxsize=1)
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def gazetteer():
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import geonamescache
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return geonamescache.GeonamesCache()
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def resolve_city(country, city):
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data = gazetteer()
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country_key = normalize(country)
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codes = [c['iso'] for c in data.get_countries().values() if country_key in (normalize(c['name']), c['iso'].lower(), c['iso3'].lower())]
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if not codes:
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raise ValidationError({'country': 'Enter a country name or ISO code, e.g. Canada or CA.'})
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city_key = normalize(city)
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country_cities = [c for c in data.get_cities().values() if c['countrycode'] in codes]
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# Prefer the city's canonical name over another town's historical aliases.
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# E.g. Tehran is also listed as an alias of Tiran in GeoNames.
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matches = [c for c in country_cities if normalize(c['name']) == city_key]
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if not matches:
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matches = [c for c in country_cities if city_key in {
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normalize(alias) for alias in c.get('alternatenames', [])
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}]
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if len(matches) != 1:
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raise ValidationError({'city': 'City not found or ambiguous. Use coordinates for small towns or cities with the same name.'})
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return matches[0]['latitude'], matches[0]['longitude']
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