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diff --git a/data/extensions/{b7f9d2cd-d772-4302-8c3f-eb941af36f76}/assets/javascripts/helpers/google-maps.js b/data/extensions/{b7f9d2cd-d772-4302-8c3f-eb941af36f76}/assets/javascripts/helpers/google-maps.js
new file mode 100644
index 0000000..2ba924b
--- /dev/null
+++ b/data/extensions/{b7f9d2cd-d772-4302-8c3f-eb941af36f76}/assets/javascripts/helpers/google-maps.js
@@ -0,0 +1,52 @@
+const targets = /https?:\/\/(((www|maps)\.)?(google\.).*(\/maps)|maps\.(google\.).*)/;
+const redirects = ["https://openstreetmap.org"];
+const mapCentreRegex = /@(-?\d[0-9.]*),(-?\d[0-9.]*),(\d{1,2})[.z]/;
+const dataLatLngRegex = /(!3d|!4d)(-?[0-9]{1,10}.[0-9]{1,10})/g;
+const placeRegex = /\/place\/(.*)\//;
+const travelModes = {
+  driving: "fossgis_osrm_car",
+  walking: "fossgis_osrm_foot",
+  bicycling: "fossgis_osrm_bike",
+  transit: "fossgis_osrm_car", // not implemented on OSM, default to car.
+};
+const layers = {
+  none: "S",
+  transit: "T",
+  traffic: "S", // not implemented on OSM, default to standard.
+  bicycling: "C",
+};
+function addressToLatLng(address, callback) {
+  const xmlhttp = new XMLHttpRequest();
+  xmlhttp.onreadystatechange = () => {
+    if (xmlhttp.readyState === XMLHttpRequest.DONE) {
+      if (xmlhttp.status === 200) {
+        const json = JSON.parse(xmlhttp.responseText)[0];
+        if (json) {
+          callback(
+            `${json.lat}%2C${json.lon}`,
+            `${json.boundingbox[2]},${json.boundingbox[1]},${json.boundingbox[3]},${json.boundingbox[0]}`
+          );
+        }
+      } else {
+        console.info("Error: Status is " + xmlhttp.status);
+      }
+    }
+  };
+  xmlhttp.open(
+    "GET",
+    `https://nominatim.openstreetmap.org/search/${address}?format=json&limit=1`,
+    false
+  );
+  xmlhttp.send();
+}
+
+export default {
+  targets,
+  redirects,
+  mapCentreRegex,
+  dataLatLngRegex,
+  placeRegex,
+  travelModes,
+  layers,
+  addressToLatLng,
+};