mirror of
https://github.com/n30nex/CartoLite-Server.git
synced 2026-10-17 20:09:56 +00:00
36 lines
1.7 KiB
JavaScript
36 lines
1.7 KiB
JavaScript
const key = process.env.CARTO_BASEMAP_API_KEY?.trim()
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if (!key) throw new Error('CARTO_BASEMAP_API_KEY is required')
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const tileJSON = await checkedFetch(
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`https://tiles.basemaps.cartocdn.com/vector/carto.streets/v1/tiles.json?key=${encodeURIComponent(key)}`,
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'TileJSON',
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'application/json',
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)
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const metadata = JSON.parse(new TextDecoder().decode(tileJSON.body))
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const template = metadata.tiles?.[0]
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if (typeof template !== 'string') throw new Error('CARTO TileJSON has no vector tile template')
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const tileURL = new URL(template.replace('{z}', '0').replace('{x}', '0').replace('{y}', '0'))
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tileURL.searchParams.set('key', key)
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const vector = await checkedFetch(tileURL, 'vector PBF', 'protobuf')
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const glyphURL = new URL('https://tiles.basemaps.cartocdn.com/fonts/Open%20Sans%20Regular/0-255.pbf')
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glyphURL.searchParams.set('key', key)
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const glyph = await checkedFetch(glyphURL, 'glyph PBF', 'protobuf')
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console.log(JSON.stringify({
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tileJSON: { status: tileJSON.status, type: tileJSON.type, bytes: tileJSON.bytes },
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vector: { status: vector.status, type: vector.type, bytes: vector.bytes },
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glyph: { status: glyph.status, type: glyph.type, bytes: glyph.bytes },
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}))
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async function checkedFetch(url, label, expectedType) {
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const response = await fetch(url, { headers: { accept: '*/*' }, signal: AbortSignal.timeout(5_000) })
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const body = new Uint8Array(await response.arrayBuffer())
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const bytes = body.byteLength
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const type = response.headers.get('content-type')?.split(';', 1)[0] ?? ''
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if (!response.ok || bytes === 0 || !type.includes(expectedType)) {
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throw new Error(`${label} failed authorization or content validation (status ${response.status}, type ${type || 'missing'}, bytes ${bytes})`)
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}
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return { status: response.status, type, bytes, body }
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}
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