Add binary format middleware for sequence data.

It responds to the MIME type:
application/dougal-map-sequence+octet-stream

lib/www/server/api/middleware/sequence/get/binary.js

@@ -0,0 +1,61 @@
+
+const { sequence } = require('../../../../lib/db');
+const { MSGTYPE, encode } = require('../../../../lib/binary');
+
+module.exports = async function (req, res, next) {
+
+	try {
+		const json = await sequence.get(req.params.project, req.params.sequence, req.query);
+
+		let msgType, geometry, error;
+		switch (req.query.geometry) {
+			case "F":
+			case "FINAL":
+				msgType = MSGTYPE.FINAL_OPT;
+				geometry = "geometryfinal";
+				error = "errorfinal";
+				break;
+			case "f":
+			case "final":
+				msgType = MSGTYPE.FINAL;
+				geometry = "geometryfinal";
+				error = "errorfinal";
+				break;
+			case "R":
+			case "RAW":
+				msgType = MSGTYPE.RAW_OPT;
+				geometry = "geometryraw";
+				error = "errorraw";
+				break;
+			case "r":
+			case "raw":
+				msgType = MSGTYPE.RAW;
+				geometry = "geometryraw";
+				error = "errorraw";
+				break;
+			case "P":
+			case "PREPLOT":
+				msgType = MSGTYPE.PREPLOT_RAWERROR_OPT;
+				geometry = "geometrypreplot";
+				error = ["errorfinal", "errorraw"];
+				break;
+			case "p":
+			case "preplot":
+			default:
+				msgType = MSGTYPE.PREPLOT;
+				geometry = "geometrypreplot";
+				break;
+		}
+
+		const endianness = req.query.endianness != "big";
+
+		const data = encode(json, geometry, error, msgType, endianness);
+		console.log("bundle", data);
+
+		res.status(200).send(Buffer.from(data));
+		next();
+	} catch (err) {
+		next(err);
+	}
+
+};

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

@@ -1,11 +1,13 @@
 const json = require('./json');
 const geojson = require('./geojson');
+const binary = require('./binary');
 
 module.exports = async function (req, res, next) {
 	try {
 		const handlers = {
 			"application/json": json,
 			"application/geo+json": geojson,
+			"application/dougal-map-sequence+octet-stream": binary
 		};
 
 		const mimetype = (handlers[req.query.mime] && req.query.mime) || req.accepts(Object.keys(handlers));