Add endpoint for retrieving real-time data as GeoJSON

lib/www/server/api/index.js

@@ -134,6 +134,9 @@ app.map({
 // 	},
 	'/navdata/': {
 		get: [ mw.navdata.get ],
+		'gis/:featuretype(line|point)': {
+			get: [ mw.gis.navdata.get ]
+		}
 	}
 //
 // 	'/user': {

lib/www/server/api/middleware/gis/index.js

@@ -1,3 +1,4 @@
 module.exports = {
-	project: require('./project')
+	project: require('./project'),
+	navdata: require('./navdata')
 };

lib/www/server/api/middleware/gis/navdata/get.js

@@ -0,0 +1,40 @@
+
+const { gis } = require('../../../../lib/db');
+
+function makeOptions (query) {
+	const options = {};
+
+	if (query.hasOwnProperty("limit")) {
+		options.limit = Math.abs(Number(query.limit));
+	}
+
+	if (query.hasOwnProperty("bbox")) {
+		options.bbox = query.bbox
+			.split(",")
+			.slice(0, 4)
+			.map( (n, i) => (i % 2) ? Number(n) % 90 : Number(n) % 180 );
+
+		if (options.bbox.some(n => isNaN(n))) {
+			delete options.bbox;
+		}
+	}
+
+	return options;
+}
+
+module.exports = async function (req, res, next) {
+
+	const handler = req.params.featuretype == "point"
+		? gis.navdata.get.points
+		: gis.navdata.get.lines;
+
+	const options = makeOptions(req.query);
+
+	try {
+		res.status(200).send(await handler(options));
+		next();
+	} catch (err) {
+		next(err);
+	}
+
+};

lib/www/server/api/middleware/gis/navdata/index.js

@@ -0,0 +1,3 @@
+module.exports = {
+	get: require('./get')
+};