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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | import { ArkErrors } from 'arktype';
import {
GeocodeJSONPointFeature,
GeocodeJSONProperties,
GeoJSONFeatureCollection,
} from '$lib/geojson.js';
const NominatimResponseSchemas = {
Reverse: GeoJSONFeatureCollection(GeocodeJSONPointFeature),
Forward: GeoJSONFeatureCollection(GeocodeJSONPointFeature),
};
function formatAddress({
housenumber,
street,
city,
country,
postcode,
name,
}: (typeof GeocodeJSONProperties)['infer']['geocoding']) {
return [[name], [housenumber, street], [postcode, city], [country]]
.map((fragment) => fragment.join(' ').trim())
.filter((fragment) => Boolean(fragment))
.join(', ');
}
/**
* @see https://nominatim.org/release-docs/develop/api/Reverse/
* @param param0 coordinates
*/
export async function coordinatesToAddress({
latitude,
longitude,
}: {
latitude: number;
longitude: number;
}): Promise<string | null> {
const response = await fetch(
`https://nominatim.openstreetmap.org/reverse?${new URLSearchParams({
format: 'geocodejson',
lon: longitude.toString(),
lat: latitude.toString(),
addressdetails: '1',
})}`
);
const data = NominatimResponseSchemas.Reverse(await response.json());
if (data instanceof ArkErrors) {
console.warn(
`Failed to reverse-geocode lon=${longitude}, lat=${latitude} with Nominatim:`,
response,
data
);
return null;
}
const [result] = data.features;
return formatAddress(result.properties.geocoding);
}
let coordinatesSuggestionAbortController = new AbortController();
/**
*
* @see https://nominatim.org/release-docs/develop/api/Search/
* @yields { label: name of the place, to display, longitude, latitude }
*/
export async function* suggestCoordinates(query: string): AsyncIterable<{
label: string;
longitude: number;
latitude: number;
}> {
coordinatesSuggestionAbortController.abort('new search started');
coordinatesSuggestionAbortController = new AbortController();
const response = await fetch(
`https://nominatim.openstreetmap.org/search?${new URLSearchParams({
format: 'geocodejson',
addressdetails: '1',
q: query,
limit: '5',
})}`,
{
signal: coordinatesSuggestionAbortController.signal,
}
);
const data = NominatimResponseSchemas.Forward(await response.json());
if (data instanceof ArkErrors) {
console.warn(`Failed to geocoe "${query}" with Nominatim:`, response, data);
return;
}
for (const { geometry, properties } of data.features) {
const [lon, lat] = geometry.coordinates;
yield {
label: formatAddress(properties.geocoding),
longitude: lon,
latitude: lat,
};
}
}
|