Add export functions for SeisJSON data.

These functions abstract the creation of SeisJSON payloads
and their various representations as GeoJSON, HTML or PDF.

lib/www/server/lib/sse/present/filename.js

@@ -0,0 +1,19 @@
+const path = require('path');
+
+function filename(sequenceOrFilename, extension) {
+	if (typeof sequenceOrFilename === "string") {
+		const name = sequenceOrFilename;
+		return path.basename(name, path.extname(name))+extension;
+	} else if (typeof sequenceOrFilename === "object") {
+		const sequence = sequenceOrFilename;
+		const lineName = sequence?.meta?.lineName;
+		const fileName = lineName
+			? `${lineName}-NavLog${extension}`
+			: `sequence-${sequence?.sequence}${extension}`;
+		return fileName;
+	} else {
+		return "SequenceData"+extension;
+	}
+}
+
+module.exports = filename;

lib/www/server/lib/sse/present/geojson.js

@@ -0,0 +1,29 @@
+const transform = require('../transform');
+const prepare = require('../prepare');
+const filename = require('./filename');
+
+
+function makeGeoJSON (events) {
+	return {
+		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;
+		})
+	};
+}
+
+async function geojson ({project, sequence}) {
+	const {events, sequences} = await prepare(project, {sequence});
+	const data = makeGeoJSON(events);
+	const name = filename(sequences.find(i => i.sequence == sequence), ".geojson");
+
+	return { name, data, mimetype: "application/geo+json" };
+}
+
+module.exports = geojson;

lib/www/server/lib/sse/present/html.js

@@ -0,0 +1,21 @@
+const db = require('../../db');
+const render = require('../../render');
+const seisjson = require('./seisjson');
+const filename = require('./filename');
+
+// FIXME Refactor when able
+const defaultTemplatePath = require('path').resolve(__dirname, "../../../../../../etc/default/templates/sequence.html.njk");
+
+
+async function html ({project, sequence}, seisdata) {
+	const sequenceData = async () => db.sequence.get(project, sequence, {summary: true});
+
+	const template = (await db.configuration.get(project, "sse/templates/0/template")) || defaultTemplatePath;
+	const json = seisdata?.data ?? await seisjson({project, sequence});
+	const data = await render(json, template);
+	const name = filename(seisdata?.name || await sequenceData(), ".html");
+
+	return { name, data, mimetype: "text/html" };
+}
+
+module.exports = html;

lib/www/server/lib/sse/present/index.js

@@ -0,0 +1,8 @@
+
+module.exports = {
+// 	csv:  require('./csv'),
+	geojson:  require('./geojson'),
+	html:  require('./html'),
+	pdf:  require('./pdf'),
+	seisjson:  require('./seisjson'),
+};

lib/www/server/lib/sse/present/pdf.js

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+const fs = require('fs/promises');
+const Path = require('path');
+const crypto = require('crypto');
+const { url2pdf } = require('../../selenium');
+const html = require('./html');
+const filename = require('./filename');
+
+
+function tmpname (tmpdir="/dev/shm") {
+	return Path.join(tmpdir, crypto.randomBytes(16).toString('hex')+".tmp");
+}
+
+async function makePDF (text) {
+	const fname = tmpname();
+	try {
+		await fs.writeFile(fname, text);
+		const pdf = Buffer.from(await url2pdf("file://"+fname), "base64");
+		return pdf;
+	} catch (err) {
+		if (err.message.startsWith("template")) {
+			throw {message: err.message};
+		} else {
+			throw err;
+		}
+	} finally {
+		await fs.unlink(fname);
+	}
+}
+
+async function pdf ({project, sequence}, seisdata) {
+
+	const htmlData = await html({project, sequence}, seisdata);
+	const text = htmlData.data;
+	const data = await makePDF(text);
+	const name = filename(seisdata?.name, ".pdf");
+
+	return { name, data, mimetype: "application/pdf" };
+}
+
+module.exports = pdf;

lib/www/server/lib/sse/present/seisjson.js

@@ -0,0 +1,14 @@
+const transform = require('../transform');
+const prepare = require('../prepare');
+const filename = require('./filename');
+
+
+async function seisjson ({project, sequence}) {
+	const {events, sequences} = await prepare(project, {sequence});
+	const data = transform(events, sequences, {projectId: project});
+	const name = filename(sequences.find(i => i.sequence == sequence), ".json");
+
+	return { name, data, mimetype: "application/vnd.seis+json" };
+}
+
+module.exports = seisjson;