Add layer-type switching to use dark tiles

[rails.git] / app / assets / javascripts / embed.js.erb

diff --git a/app/assets/javascripts/embed.js.erb b/app/assets/javascripts/embed.js.erb
index 36b23666a92f8ebe61481ba8d508d014a76b60bf..34a8b68bcf8740e880fcb6e7574ce8adc169e75b 100644 (file)
--- a/app/assets/javascripts/embed.js.erb
+++ b/app/assets/javascripts/embed.js.erb
@@ -1,75 +1,88 @@
-//= require leaflet
+//= depend_on settings.yml
+//= depend_on settings.local.yml
+//= depend_on layers.yml
+//= require leaflet/dist/leaflet-src
 //= require leaflet.osm
 //= require i18n
 //= require i18n/embed
 
-window.onload = function () {
-  if (navigator.languages) {
-    I18n.locale = navigator.languages[0];
-  } else if (navigator.language) {
-    I18n.locale = navigator.language;
-  }
+if (navigator.languages) {
+  I18n.locale = navigator.languages[0];
+} else if (navigator.language) {
+  I18n.locale = navigator.language;
+}
 
-  var query = (window.location.search || '?').substr(1),
-      args  = {};
+I18n.default_locale = <%= I18n.default_locale.to_json %>;
+I18n.fallbacks = true;
 
-  var pairs = query.split('&');
-  for (var i = 0; i < pairs.length; i++) {
-    var parts = pairs[i].split('=');
-    args[parts[0]] = decodeURIComponent(parts[1] || '');
-  }
+window.onload = function () {
+  const args = Object.fromEntries(new URLSearchParams(window.location.search));
+
+  const tileOptions = {
+    mapnik: {
+<% if Settings.key?(:tile_cdn_url) %>
+      url: <%= Settings.tile_cdn_url.to_json %>
+<% end %>
+    }
+  };
 
-  var thunderforestOptions = {
-<% if defined?(THUNDERFOREST_KEY) %>
-    apikey: <%= THUNDERFOREST_KEY.to_json %>
+  const apiKeys = {
+<% if Settings.key?(:thunderforest_key) %>
+    THUNDERFOREST_KEY: <%= Settings.thunderforest_key.to_json %>
 <% end %>
   };
 
   var map = L.map("map");
-  map.attributionControl.setPrefix('');
+  map.attributionControl.setPrefix("");
   map.removeControl(map.attributionControl);
 
-  if (!args.layer || args.layer === "mapnik" || args.layer === "osmarender" || args.layer === "mapquest") {
-    new L.OSM.Mapnik().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);
-  }
+  const isDarkTheme = args.theme === "dark" || (args.theme !== "light" && window.matchMedia("(prefers-color-scheme: dark)").matches);
+  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"],
+          darkLayer: entry["leafletOsmDarkId"],
+          apiKeyId: entry["apiKeyId"]
+        }.compact
+      end.to_json
+    %>;
+  const layerId = (args.layer || "").replaceAll(" ", "");
+  const layerConfig = layers[layerId] || layers.mapnik;
+  const { layer, ...options } = {
+    layer: layerConfig.darkLayer && isDarkTheme ? layerConfig.darkLayer : 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({
-      iconUrl: <%= asset_path('images/marker-icon.png').to_json %>,
+    L.marker(args.marker.split(","), { icon: L.icon({
+      iconUrl: <%= asset_path('leaflet/dist/images/marker-icon.png').to_json %>,
       iconSize: new L.Point(25, 41),
       iconAnchor: new L.Point(12, 41),
-      shadowUrl: <%= asset_path('images/marker-shadow.png').to_json %>,
+      shadowUrl: <%= asset_path('leaflet/dist/images/marker-shadow.png').to_json %>,
       shadowSize: new L.Point(41, 41)
-    })}).addTo(map);
+    }) }).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="http://www.openstreetmap.org/fixthemap?lat={x}&lon={y}&zoom={z}" target="_blank">'+I18n.t('javascripts.embed.report_problem')+'</a>'
+    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>`
   },
 
   onAdd: function (map) {
     var container = L.Control.Attribution.prototype.onAdd.call(this, map);
 
-    map.on('moveend', this._update, this);
+    map.on("moveend", this._update, this);
 
     return container;
   },
@@ -79,8 +92,8 @@ L.Control.OSMReportAProblem = L.Control.Attribution.extend({
 
     this._container.innerHTML =
       this._container.innerHTML
-        .replace('{x}', this._map.getCenter().lat)
-        .replace('{y}', this._map.getCenter().lng)
-        .replace('{z}', this._map.getZoom());
+        .replace("{x}", this._map.getCenter().lat)
+        .replace("{y}", this._map.getCenter().lng)
+        .replace("{z}", this._map.getZoom());
   }
 });