Add CSV event import.

Closes #336

lib/www/server/api/middleware/event/import/csv.js

@@ -0,0 +1,146 @@
+const Busboy = require('busboy');
+const { parse } = require('csv-parse/sync');
+
+async function middleware(req, res, next) {
+	const contentType = req.headers['content-type'] || '';
+	let csvText = null;
+	let filename = null;
+
+	if (req.params.filename && contentType.startsWith('text/csv')) {
+		csvText = typeof req.body === 'string' ? req.body : req.body.toString('utf8');
+		filename = req.params.filename;
+		processCsv();
+	} else if (contentType.startsWith('multipart/form-data')) {
+		const busboy = Busboy({ headers: req.headers });
+		let found = false;
+		busboy.on('file', (name, file, info) => {
+			if (found) {
+				file.resume();
+				return;
+			}
+			if (info.mimeType === 'text/csv') {
+				found = true;
+				filename = info.filename || 'unnamed.csv';
+				csvText = '';
+				file.setEncoding('utf8');
+				file.on('data', (data) => { csvText += data; });
+				file.on('end', () => {});
+			} else {
+				file.resume();
+			}
+		});
+		busboy.on('field', () => {}); // Ignore fields
+		busboy.on('finish', () => {
+			if (!found) {
+				return next();
+			}
+			processCsv();
+		});
+		req.pipe(busboy);
+		return;
+	} else {
+		return next();
+	}
+
+	function processCsv() {
+		let records;
+		try {
+			records = parse(csvText, {
+				relax_quotes: true,
+				quote: '"',
+				escape: '"',
+				skip_empty_lines: true,
+				trim: true
+			});
+		} catch (e) {
+			return res.status(400).json({ error: 'Invalid CSV' });
+		}
+		if (!records.length) {
+			return res.status(400).json({ error: 'Empty CSV' });
+		}
+		const headers = records[0].map(h => h.toLowerCase().trim());
+		const rows = records.slice(1);
+		let lastDate = null;
+		let lastTime = null;
+		const currentDate = new Date().toISOString().slice(0, 10);
+		const currentTime = new Date().toISOString().slice(11, 19);
+		const events = [];
+		for (let row of rows) {
+			let object = { labels: [] };
+			for (let k = 0; k < headers.length; k++) {
+				let key = headers[k];
+				let val = row[k] ? row[k].trim() : '';
+				if (!key) continue;
+				if (['remarks', 'event', 'comment', 'comments', 'text'].includes(key)) {
+					object.remarks = val;
+				} else if (key === 'label') {
+					if (val) object.labels.push(val);
+				} else if (key === 'labels') {
+					if (val) object.labels.push(...val.split(';').map(l => l.trim()).filter(l => l));
+				} else if (key === 'sequence' || key === 'seq') {
+					if (val) object.sequence = Number(val);
+				} else if (['point', 'shot', 'shotpoint'].includes(key)) {
+					if (val) object.point = Number(val);
+				} else if (key === 'date') {
+					object.date = val;
+				} else if (key === 'time') {
+					object.time = val;
+				} else if (key === 'timestamp') {
+					object.timestamp = val;
+				} else if (key === 'latitude') {
+					object.latitude = parseFloat(val);
+				} else if (key === 'longitude') {
+					object.longitude = parseFloat(val);
+				}
+			}
+			if (!object.remarks) continue;
+			let useSeqPoint = Number.isFinite(object.sequence) && Number.isFinite(object.point);
+			let tstamp = null;
+			if (!useSeqPoint) {
+				if (object.timestamp) {
+					tstamp = new Date(object.timestamp);
+				}
+				if (!tstamp || isNaN(tstamp.getTime())) {
+					let dateStr = object.date || lastDate || currentDate;
+					let timeStr = object.time || lastTime || currentTime;
+					if (timeStr.length === 5) timeStr += ':00';
+					let full = `${dateStr}T${timeStr}.000Z`;
+					tstamp = new Date(full);
+					if (isNaN(tstamp.getTime())) continue;
+				}
+				if (object.date) lastDate = object.date;
+				if (object.time) lastTime = object.time;
+			}
+			let event = {
+				remarks: object.remarks,
+				labels: object.labels,
+				meta: {
+					author: "*CSVImport*",
+					"*CSVImport*": {
+						filename,
+						tstamp: new Date().toISOString()
+					}
+				}
+			};
+			if (!isNaN(object.latitude) && !isNaN(object.longitude)) {
+				event.meta.geometry = {
+					type: "Point",
+					coordinates: [object.longitude, object.latitude]
+				};
+			}
+			if (useSeqPoint) {
+				event.sequence = object.sequence;
+				event.point = object.point;
+			} else if (tstamp) {
+				event.tstamp = tstamp.toISOString();
+			} else {
+				continue;
+			}
+			events.push(event);
+		}
+		req.body = events;
+		next();
+	}
+}
+
+module.exports = middleware;