departure point can be null

background.js

@@ -17,8 +17,8 @@ let gpxTrack = null;
  */
 function toWGS84(point) {
   // convert LV95 into the civilian system
-  let y_aux = (point[0] - 2600000) / 1000000;
+  const y_aux = (point[0] - 2600000) / 1000000;
-  let x_aux = (point[1] - 1200000) / 1000000;
+  const x_aux = (point[1] - 1200000) / 1000000;
 
   // calculate longitude and latitude in the unit 10000"
   let lat = 16.9023892 +
@@ -26,7 +26,7 @@ function toWGS84(point) {
     0.270978 * Math.pow(y_aux, 2) -
     0.002528 * Math.pow(x_aux, 2) -
     0.0447 * Math.pow(y_aux, 2) * x_aux -
-    0.0140 * Math.pow(x_aux, 3);
+    0.014 * Math.pow(x_aux, 3);
 
   let lon = 2.6779094 +
     4.728982 * y_aux +
@@ -35,8 +35,8 @@ function toWGS84(point) {
     0.0436 * Math.pow(y_aux, 3);
 
   // unit 10000" to 1" and seconds to degrees (dec)
-  lat = lat * 100 / 36;
+  lat = (lat * 100) / 36;
-  lon = lon * 100 / 36;
+  lon = (lon * 100) / 36;
 
   return { lat: lat, lon: lon };
 }
@@ -48,7 +48,7 @@ function toWGS84(point) {
  * @returns Track point xml node for gpx.
  */
 function toTrackPoint(point) {
-  let wgs84Point = toWGS84(point);
+  const wgs84Point = toWGS84(point);
   return `<trkpt lat="${wgs84Point.lat}" lon="${wgs84Point.lon}"/>`;
 }
 
@@ -58,7 +58,7 @@ function toTrackPoint(point) {
  * @returns Way point xml node for gpx.
  */
 function toWayPoint(point) {
-  let wgs84Point = toWGS84(point.geom.coordinates);
+  const wgs84Point = toWGS84(point.geom.coordinates);
   return `
     <wpt lat="${wgs84Point.lat}" lon="${wgs84Point.lon}">
         <ele>${point.altitude}</ele>
@@ -73,7 +73,6 @@ function toWayPoint(point) {
  * @returns Combined route number, id and route title.
  */
 function trackTitle(geoJson) {
-  const route = geoJson.segments[0];
   const book = geoJson.book_route_number
     ? `${geoJson.book_route_number} - `
     : "";
@@ -88,18 +87,25 @@ function trackTitle(geoJson) {
  * @returns Simple gpx string.
  */
 function toGpx(geoJson) {
-  let trackSegments = geoJson.segments.map((segment) => {
+  const trackSegments = geoJson.segments
-    if (segment.geom == null) return "";
+    .map((segment) => {
-    return `<trkseg>
+      if (segment.geom == null) return "";
+      return `<trkseg>
              ${segment.geom.coordinates.map(toTrackPoint).join("")}
          </trkseg>`;
-  }).join("");
+    })
+    .join("");
 
-  let endPoint = geoJson.end_point ? toWayPoint(geoJson.end_point) : "";
+  const departurePoint = geoJson.departure_point
-  let waypoints = geoJson.waypoints
+    ? toWayPoint(geoJson.departure_point)
-    ? geoJson.waypoints.map((wp) => {
+    : "";
-      return toWayPoint(wp.reference_poi);
+  const endPoint = geoJson.end_point ? toWayPoint(geoJson.end_point) : "";
-    }).join("")
+  const waypoints = geoJson.waypoints
+    ? geoJson.waypoints
+      .map((wp) => {
+        return toWayPoint(wp.reference_poi);
+      })
+      .join("")
     : "";
 
   const routeTitle = trackTitle(geoJson);
@@ -111,7 +117,7 @@ function toGpx(geoJson) {
         xsi:schemaLocation="http://www.topografix.com/GPX/1/0 http://www.topografix.com/GPX/1/0/gpx.xsd"
         version="1.0"
         creator="SAC-Tourenportal GPX Downloader">
-      ${toWayPoint(geoJson.departure_point)}
+      ${departurePoint}
       ${toWayPoint(geoJson.destination_poi)}
       ${waypoints}
       ${endPoint}
@@ -123,7 +129,7 @@ function toGpx(geoJson) {
     `;
 
   const parser = new DOMParser();
-  let xmlDoc = parser.parseFromString(xmlString, "text/xml");
+  const xmlDoc = parser.parseFromString(xmlString, "text/xml");
 
   return new XMLSerializer().serializeToString(xmlDoc.documentElement);
 }
@@ -132,26 +138,26 @@ function toGpx(geoJson) {
  * Intercept the download of GeoJSON data and save it for the background script.
  */
 function listener(details) {
-  let filter = browser.webRequest.filterResponseData(details.requestId);
+  const filter = browser.webRequest.filterResponseData(details.requestId);
-  let decoder = new TextDecoder("utf-8");
+  const decoder = new TextDecoder("utf-8");
-  let encoder = new TextEncoder();
+  const encoder = new TextEncoder();
 
-  let data = [];
+  const data = [];
   filter.ondata = (event) => {
     data.push(event.data);
   };
 
-  filter.onstop = async (event) => {
+  filter.onstop = async (_event) => {
-    let blob = new Blob(data, { type: "text/html" });
+    const blob = new Blob(data, { type: "text/html" });
-    let buffer = await blob.arrayBuffer();
+    const buffer = await blob.arrayBuffer();
-    let str = decoder.decode(buffer);
+    const str = decoder.decode(buffer);
 
     updateActiveTab(browser.tabs);
 
     filter.write(encoder.encode(str));
     filter.close();
 
-    let geoJson = JSON.parse(str);
+    const geoJson = JSON.parse(str);
     const routeTitle = trackTitle(geoJson);
     gpxTrack = { title: routeTitle, data: toGpx(geoJson) };
   };
@@ -182,10 +188,10 @@ function handleClick(tab) {
     return;
   }
 
-  let blob = new Blob([gpxTrack.data], { type: "application/gpx+xml" });
+  const blob = new Blob([gpxTrack.data], { type: "application/gpx+xml" });
-  let objectURL = URL.createObjectURL(blob);
+  const objectURL = URL.createObjectURL(blob);
 
-  let downloading = browser.downloads.download({
+  const downloading = browser.downloads.download({
     url: objectURL,
     filename: `${gpxTrack.title}.gpx`,
     saveAs: true,
@@ -202,14 +208,14 @@ function handleClick(tab) {
 /**
  * Update the download icon and text.
  */
-function updateActiveTab(tabs) {
+function updateActiveTab(_tabs) {
   function updateTab(tabs) {
     if (tabs[0]) {
       updateIcon(tabs[0]);
     }
   }
 
-  let gettingActiveTab = browser.tabs.query({
+  const gettingActiveTab = browser.tabs.query({
     active: true,
     currentWindow: true,
   });

manifest.json

@@ -1,19 +1,15 @@
 {
-
     "manifest_version": 2,
     "name": "SAC Route Portal GPX Downloader",
-    "version": "0.7",
+    "version": "0.8",
     "developer": {
         "name": "Sebastian Hugentobler",
         "url": "https://code.vanwa.ch/sebastian/sac-route-portal-gpx-fx"
     },
-
     "description": "Download gpx tracks from the sac route portal.",
-
     "icons": {
         "48": "icons/map.png"
     },
-
     "permissions": [
         "activeTab",
         "downloads",
@@ -21,13 +17,13 @@
         "webRequestBlocking",
         "https://www.sac-cas.ch/*"
     ],
-    
     "background": {
-        "scripts": ["background.js"]
+        "scripts": [
+            "background.js"
+        ]
     },
-
     "browser_action": {
         "default_icon": "icons/map.png",
         "default_title": "To GPX"
-      }
+    }
 }