Add PDF output option for events log

lib/www/server/api/middleware/event/get/index.js

@@ -2,6 +2,7 @@ const json = require('./json');
 const geojson = require('./geojson');
 const seis = require('./seis');
 const html = require('./html');
+const pdf = require('./pdf');
 
 module.exports = async function (req, res, next) {
 	try {
@@ -10,6 +11,7 @@ module.exports = async function (req, res, next) {
 			"application/geo+json": geojson,
 			"application/vnd.seis+json": seis,
 			"text/html": html,
+			"application/pdf": pdf
 		};
 		
 		const mimetype = (handlers[req.query.mime] && req.query.mime) || req.accepts(Object.keys(handlers));

lib/www/server/api/middleware/event/get/pdf.js

@@ -0,0 +1,42 @@
+const fs = require('fs/promises');
+const Path = require('path');
+const crypto = require('crypto');
+const { event, sequence, configuration } = require('../../../../lib/db');
+const { transform } = require('../../../../lib/sse');
+const render = require('../../../../lib/render');
+const { url2pdf } = require('../../../../lib/selenium');
+
+function tmpname (tmpdir="/dev/shm") {
+	return Path.join(tmpdir, crypto.randomBytes(16).toString('hex')+".tmp");
+}
+
+const pdf = async function (req, res, next) {
+	const fname = tmpname();
+	try {
+		const query = req.query;
+		query.sequence = req.params.sequence;
+		const events = await event.list(req.params.project, query);
+		const sequences = await sequence.list(req.params.project, query);
+		const seis = transform(events, sequences, {projectId: req.params.project});
+		const templates = await configuration.get(req.params.project, "sse/templates");
+		const template = templates[0].template;
+		
+		const html = await render(seis, template);
+		
+		await fs.writeFile(fname, html);
+		const pdf = Buffer.from(await url2pdf("file://"+fname), "base64");
+		
+		res.status(200).send(pdf);
+		next();
+	} catch (err) {
+		if (err.message.startsWith("template")) {
+			next({message: err.message});
+		} else {
+			next(err);
+		}
+	} finally {
+		await fs.unlink(fname);
+	}
+};
+
+module.exports = pdf;