190 lines
10 KiB
JavaScript
190 lines
10 KiB
JavaScript
/**
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* useMapProvider.js — resolve the active map engine ("provider").
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*
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* Resolution order (first defined wins) — matches resolveMapProvider below EXACTLY:
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* 1. profile-config `provider` — per-map, set in the profile-config JSON
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* 2. ?provider= in the page URL — read here directly, so any generated leaf page can be
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* flipped from the URL without the host doing anything
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* 3. window.MAP_PROVIDER — host global, for a host that sets it programmatically
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* 4. 'auto' — the default: Mapbox WHEN A TOKEN IS AVAILABLE, else MapLibre
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*
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* Valid values: 'mapbox' | 'maplibre' | 'auto'. Anything else is treated as 'auto'.
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*
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* ★ 'auto' (2026-09-25, by project decision). The public repo carries NO Mapbox token, so a default
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* of 'mapbox' gave every keyless visitor a map that could not draw and a paste-a-token prompt.
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* 'auto' asks the token ladder instead: a token in this element's profile-config (`tk`), or one
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* published page-wide (window.MAP_TOKEN — the generated leaf's ?tk= / pasted / baked / fetched rungs,
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* the studio's ⚙ Settings, and any element handed a `tk` all land there, see useSharedMapToken)
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* means Mapbox, exactly as before. No token anywhere means MapLibre, keyless, with zero requests to
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* Mapbox. An explicit provider (rungs 1-3) always wins.
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* The decision is taken when the map is created: a token that arrives LATER does not swap a map
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* that already drew with MapLibre (a host that fetches its token should set it before mounting, or
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* set provider:'mapbox' explicitly).
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*
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* documentation/how-to.md ("Swap the map engine") carries the same order; keep the two in sync, and
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* treat THIS function as the authority when they disagree.
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*/
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import { inject } from 'vue'
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export const MAP_PROVIDERS = ['mapbox', 'maplibre']
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export const DEFAULT_PROVIDER = 'auto'
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/** Unwrap a ref/computed to its config object; pass plain objects through. */
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function unwrapConfig(profileConfig) {
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if (profileConfig && typeof profileConfig === 'object'
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&& 'value' in profileConfig && !('provider' in profileConfig) && !('profile' in profileConfig)) {
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return profileConfig.value
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}
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return profileConfig
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}
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/**
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* Is a Mapbox token available to this map? The element's own `tk`, or the page-wide token
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* (window.MAP_TOKEN, which useSharedMapToken bridges to every element's published tk).
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*/
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export function hasMapToken(cfg) {
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// The embed snippets ship tk:"YOUR_MAPBOX_TOKEN" as a placeholder; an unfilled one is not a token.
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const real = (v) => typeof v === 'string' && !!v.trim() && !/^YOUR_/.test(v.trim())
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if (real(cfg?.tk)) return true
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// A token service to ask (profile-config.tokenUrl) counts: the element fetches it before the map starts.
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if (/^https?:\/\//i.test(String(cfg?.tokenUrl || ''))) return true
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if (typeof window === 'undefined') return false
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return real(window.MAP_TOKEN) || real(window.__doxaMapToken) || !!window.__doxaMapTokenPending
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}
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/**
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* Resolve the provider from a profile-config (object or ref) + window fallback.
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* Always returns a concrete engine ('mapbox' | 'maplibre'); 'auto' is decided here. `token` is a
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* token the caller holds outside the config (useMapInstance's accessToken); it counts as available.
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* Pure — safe to call outside a Vue setup().
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*/
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export function resolveMapProvider(profileConfig, { token } = {}) {
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const cfg = unwrapConfig(profileConfig)
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return explicitMapProvider(cfg) || (hasMapToken(cfg) || hasMapToken({ tk: token }) ? 'mapbox' : 'maplibre')
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}
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/** The engine someone ASKED for (rungs 1-3), or '' when the default ('auto') decides. */
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export function explicitMapProvider(profileConfig) {
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const cfg = unwrapConfig(profileConfig)
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const fromConfig = cfg?.provider
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const fromUrl = typeof location !== 'undefined'
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? new URLSearchParams(location.search).get('provider') : undefined
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const fromWindow = typeof window !== 'undefined' ? window.MAP_PROVIDER : undefined
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const raw = String(fromConfig || fromUrl || fromWindow || DEFAULT_PROVIDER).toLowerCase().trim()
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return MAP_PROVIDERS.includes(raw) ? raw : ''
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}
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/** Human-readable engine label for a badge / UI. */
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export function providerLabel(provider) {
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return provider === 'maplibre' ? 'MapLibre' : 'Mapbox'
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}
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/** Convenience for use inside a Vue setup() — injects the provided profileConfig. */
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export function useMapProvider() {
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const profileConfig = inject('profileConfig', null)
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return resolveMapProvider(profileConfig)
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}
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/** True when this map instance is a Mapbox GL map (vs MapLibre). Per-instance runtime
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* sniff — works even on dual-engine pages where both globals are loaded. */
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export function isMapboxMap(map) {
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return typeof window !== 'undefined' && !!window.mapboxgl && map instanceof window.mapboxgl.Map
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}
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/**
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* The engine namespace that built THIS map: window.maplibregl or window.mapboxgl. Use it for
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* everything constructed alongside a map (Marker, Popup, a second Map, controls) instead of
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* the bare `mapboxgl` global.
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*
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* ★ WHY. Every generated leaf <head> used to load mapbox-gl.js statically, whatever the provider,
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* so a bare `new mapboxgl.Popup()` always found a global, even on a MapLibre map (where it
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* built a MAPBOX popup and attached it to a MapLibre map). Removing that static peer (a visitor-IP
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* leak to api.mapbox.com under MapLibre) turns each of those into a ReferenceError on the first
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* pin select or click, and the poster's hidden map into 'mapboxgl global not found'.
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* Asking the MAP which engine it is removes the dependency on what else the page loaded.
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* @param {object} map the live map instance
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* @returns {object|undefined} the engine namespace, or undefined when neither is loaded
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*/
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export function engineFor(map) {
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if (typeof window === 'undefined') return undefined
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const ml = window.maplibregl, mb = window.mapboxgl
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if (ml && ml.Map && map instanceof ml.Map) return ml
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if (mb && mb.Map && map instanceof mb.Map) return mb
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return mb || ml
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}
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/** Mapbox-Standard-only lighting paint props, per engine. MapLibre rejects layers whose
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* paint carries unknown properties (the whole layer is dropped → invisible pins), so
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* spread this instead of writing '<kind>-emissive-strength' literally.
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*
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* ★ `kind` EXISTS BECAUSE THE CIRCLE CASE WAS NOT THE ONLY ONE. This helper was hardcoded to
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* 'circle', while fill, line and clustering layers still wrote the literal — so those layers kept
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* being dropped by MapLibre for exactly the reason written above. MEASURED on countries-map by
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* listening to the map's own `error` event, which is the ONLY place it surfaces:
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* layers.regions-fill.paint.fill-emissive-strength: unknown property
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* layers.regions-border.paint.line-emissive-strength: unknown property
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* addLayer() does NOT throw for this — it accepts the call, emits an error event, and silently
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* omits the layer. getLayer() then returns undefined and the map simply renders without it, which
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* is why it read as "the fills do not paint" rather than as an error.
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* @param {object} map the live map instance
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* @param {'circle'|'fill'|'line'} [kind='circle']
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*/
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/**
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* ── PROJECTION, PER ENGINE ───────────────────────────────────────────────────────────────────────
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* ONE place for an API that is shaped differently on each engine, gathered from 12 call sites across
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* 9 plugins (SPEC-LIBRARY-CURATION.md, candidate C2). The asymmetry:
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*
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* Mapbox getProjection() -> { name } setProjection('mercator')
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* MapLibre getProjection() -> { type } | undefined setProjection({ type: 'mercator' })
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*
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* Passing the Mapbox shape to MapLibre THROWS. That is not hypothetical: it was measured on
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* regions-dashboard, where the throw aborted the camera fly so opening a region dashboard never
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* framed its region (rega confirmed the fix by eye, rows 13/14).
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*
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* WHAT THE 12 SITES DID BEFORE, and why one helper is worth it:
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* · NINE passed a bare string, so on MapLibre the projection silently never changed. Eight wrapped
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* it in try/catch and swallowed the throw; doxa-simple-map did NOT, so there it threw uncaught.
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* · TWO had already solved it independently and differently — pplr-data-maps' setProjectionFor()
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* (instance-tested, the shape adopted here) and regions-dashboard's pair (config-derived, which
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* is weaker: it trusts what the page was configured with rather than what the map IS).
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* · ONE probed by exception, trying the object form and falling back to the string on throw.
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*
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* THE ENGINE IS READ FROM THE INSTANCE, never from config. A page can be configured for one engine
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* and hold a map built by the other (a fallback, a second map, an auto-engine decision), and the
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* object-vs-string question is a fact about the INSTANCE.
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*
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* BOTH RETURN SOMETHING OBSERVABLE, on upg100-plugin's argument: a precondition that bails without
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* recording that it bailed is indistinguishable, at the rendered layer, from the request never
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* arriving. setProjectionOn returns whether it applied; projectionOf returns null rather than
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* throwing. Callers that do not care may ignore it, and all 12 existing sites do.
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*/
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/** The current projection NAME on either engine, or null. Handles {name}, {type} and undefined. */
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export function projectionOf(map) {
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try {
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const p = map && typeof map.getProjection === 'function' ? map.getProjection() : null
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return (p && (p.name || p.type)) || null
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} catch (_) { return null }
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}
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/**
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* Set the projection on either engine. Returns true when it applied, false when it could not —
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* a style that does not support the projection is a legitimate false, not an error.
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*/
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export function setProjectionOn(map, name) {
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if (!map || !name || typeof map.setProjection !== 'function') return false
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const ml = typeof window !== 'undefined' ? window.maplibregl : null
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const wantsObject = !!(ml && ml.Map && map instanceof ml.Map)
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try {
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map.setProjection(wantsObject ? { type: name } : name)
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return true
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} catch (_) {
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// The style cannot take it (Mapbox Standard pins some projections): keep the current one.
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return false
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}
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}
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export function emissivePaint(map, kind = 'circle') {
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return isMapboxMap(map) ? { [`${kind}-emissive-strength`]: 1 } : {}
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}
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