34 lines
1.6 KiB
JavaScript
34 lines
1.6 KiB
JavaScript
import { env } from '$env/dynamic/public';
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// --- "passport stamps" reverse geocoding -----------------------------------
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// Reverse-geocodes a lat/lng pair into a { city, country } pair using the
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// Google Maps Geocoding API (REST), reusing the same PUBLIC_MAPS_KEY the
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// Maps JavaScript API loader already uses (see MapView.svelte) - the
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// Geocoding API must be enabled for this key in the Google Cloud Console for
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// this to work.
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//
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// Walks the first result's address_components looking for the 'locality'
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// type for the city name (falling back to 'administrative_area_level_1',
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// e.g. a state/province, for rural areas with no locality) and the 'country'
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// type for the country name. Returns { city: 'Unknown', country: 'Unknown' }
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// if the request fails or no results come back, so a failed lookup never
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// blocks stamp creation - it just produces a generically-labeled stamp.
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export async function reverseGeocode(lat, lng) {
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try {
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const url = `https://maps.googleapis.com/maps/api/geocode/json?latlng=${lat},${lng}&key=${env.PUBLIC_MAPS_KEY}`;
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const res = await fetch(url);
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const data = await res.json();
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const components = data.results?.[0]?.address_components ?? [];
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const findType = (type) => components.find(c => c.types.includes(type))?.long_name;
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return {
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city: findType('locality') ?? findType('administrative_area_level_1') ?? 'Unknown',
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country: findType('country') ?? 'Unknown'
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};
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} catch (err) {
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console.error('[stamps] reverse geocode failed:', err);
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return { city: 'Unknown', country: 'Unknown' };
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}
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}
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