dougal-software/lib/www/server/api/middleware/event/sequence/get/geojson.js

const { transform, prepare } = require('../../../../../lib/sse');

const geojson = async function (req, res, next) {
	try {
		const query = req.query;
		query.sequence = req.params.sequence;
		const {events, sequences} = await prepare(req.params.project, query);
		const response = {
			type: "FeatureCollection",
			features: events.filter(event => event.geometry).map(event => {
				const feature = {
					type: "Feature",
					geometry: event.geometry,
					properties: event
				};
				delete feature.properties.geometry;
				return feature;
			})
		};
		if ("download" in query || "d" in query) {
			const extension = "geojson";
			// Get the sequence number(s) (more than one sequence can be selected)
			const seqNums = query.sequence.split(";");
			// If we've only been asked for a single sequence, get its line name
			const lineName = (sequences.find(i => i.sequence == seqNums[0]) || {})?.meta?.lineName;
			const filename = (seqNums.length  == 1 && lineName)
				? `${lineName}-NavLog.${extension}`
				: `${req.params.project}-${query.sequence}.${extension}`;
			res.set("Content-Disposition", `attachment; filename="${filename}"`);
		}
		res.status(200).send(response);
		next();
	} catch (err) {
		next(err);
	}
}

module.exports = geojson;