Refactor embed.js.erb with layers.yml

app/assets/javascripts/embed.js.erb

@@ -1,5 +1,6 @@
 //= depend_on settings.yml
 //= depend_on settings.local.yml
+//= depend_on layers.yml
 //= require leaflet/dist/leaflet-src
 //= require leaflet.osm
 //= require i18n
@@ -15,42 +16,44 @@ I18n.default_locale = <%= I18n.default_locale.to_json %>;
 I18n.fallbacks = true;
 
 window.onload = function () {
-  var query = (window.location.search || "?").slice(1),
-      args = {};
+  const args = Object.fromEntries(new URLSearchParams(window.location.search));
 
-  var pairs = query.split("&");
-  for (var i = 0; i < pairs.length; i++) {
-    var parts = pairs[i].split("=");
-    args[parts[0]] = decodeURIComponent(parts[1] || "");
-  }
-
-  var mapnikOptions = {
+  const tileOptions = {
+    mapnik: {
 <% if Settings.key?(:tile_cdn_url) %>
-    url: <%= Settings.tile_cdn_url.to_json %>
+      url: <%= Settings.tile_cdn_url.to_json %>
 <% end %>
+    }
   };
 
-  var thunderforestOptions = {
+  const apiKeys = {
 <% if Settings.key?(:thunderforest_key) %>
-    apikey: <%= Settings.thunderforest_key.to_json %>
+    THUNDERFOREST_KEY: <%= Settings.thunderforest_key.to_json %>
 <% end %>
   };
 
   var map = L.map("map");
   map.attributionControl.setPrefix("");
   map.removeControl(map.attributionControl);
 
-  if (args.layer === "cyclosm") {
-    new L.OSM.CyclOSM().addTo(map);
-  } else if (args.layer === "cyclemap" || args.layer === "cycle map") {
-    new L.OSM.CycleMap(thunderforestOptions).addTo(map);
-  } else if (args.layer === "transportmap") {
-    new L.OSM.TransportMap(thunderforestOptions).addTo(map);
-  } else if (args.layer === "hot") {
-    new L.OSM.HOT().addTo(map);
-  } else {
-    new L.OSM.Mapnik(mapnikOptions).addTo(map);
-  }
+  const layers = <%=
+    YAML.load_file(Rails.root.join("config/layers.yml"))
+      .select { |entry| entry["canEmbed"] }
+      .each_with_object({}) do |entry, obj|
+        obj[entry["layerId"]] = {
+          layer: entry["leafletOsmId"],
+          apiKeyId: entry["apiKeyId"]
+        }.compact
+      end.to_json
+    %>;
+  const layerId = (args.layer || "").replaceAll(/\s/g, "");
+  const layerConfig = layers[layerId] || layers.mapnik;
+  const { layer, ...options } = {
+    layer: layerConfig.layer,
+    apikey: apiKeys[layerConfig.apiKeyId],
+    ...tileOptions[layerId]
+  };
+  new L.OSM[layer](options).addTo(map);
 
   if (args.marker) {
     L.marker(args.marker.split(","), { icon: L.icon({
@@ -62,23 +65,16 @@ window.onload = function () {
     }) }).addTo(map);
   }
 
-  if (args.bbox) {
-    var bbox = args.bbox.split(",");
-    map.fitBounds([
-      L.latLng(bbox[1], bbox[0]),
-      L.latLng(bbox[3], bbox[2])
-    ]);
-  } else {
-    map.fitWorld();
-  }
+  const bbox = (args.bbox || "-180,-90,180,90").split(",");
+  map.fitBounds([[bbox[1], bbox[0]], [bbox[3], bbox[2]]]);
 
   map.addControl(new L.Control.OSMReportAProblem());
 };
 
 L.Control.OSMReportAProblem = L.Control.Attribution.extend({
   options: {
     position: "bottomright",
-    prefix: "<a href=\"https://www.openstreetmap.org/fixthemap?lat={x}&lon={y}&zoom={z}\" target=\"_blank\">" + I18n.t("javascripts.embed.report_problem") + "</a>"
+    prefix: `<a href="https://www.openstreetmap.org/fixthemap?lat={x}&lon={y}&zoom={z}" target="_blank">${I18n.t("javascripts.embed.report_problem")}</a>`
   },
 
   onAdd: function (map) {