Add YAML and CSV support to project configuration GET endpoint

lib/www/server/api/middleware/project/configuration/get.js

@@ -1,13 +1,61 @@
-
+const YAML = require('yaml');
+const { stringify } = require('csv-stringify/sync');
 const { project } = require('../../../../lib/db');
+const { flatEntries } = require('../../../../lib/utils/flatEntries');
+
+
+function json (req, res, next) {
+	if (res.locals.payload) {
+		res.status(200).send(res.locals.payload);
+	} else {
+		res.status(404).send({message: "Not found"});
+	}
+	next();
+}
+
+function yaml (req, res, next) {
+	if (res.locals.payload) {
+		res.status(200).send(YAML.stringify(res.locals.payload));
+	} else {
+		res.status(404).send({message: "Not found"});
+	}
+	next();
+}
+
+function csv (req, res, next) {
+
+	if (res.locals.payload) {
+		const fields = [ "key", "value" ];
+		const delimiter = req.query.delimiter ?? ",";
+		const text = stringify([fields, ...flatEntries(res.locals.payload)], {delimiter});
+
+		res.status(200).send(text);
+	} else {
+		res.status(404).send({message: "Not found"});
+	}
+	next();
+}
 
 module.exports = async function (req, res, next) {
-
 	try {
-		res.status(200).send(await project.configuration.get(req.params.project));
-		next();
+		const handlers = {
+			"application/json": json,
+			"application/yaml": yaml,
+			"text/csv": csv
+		};
+
+		const mimetype = (handlers[req.query.mime] && req.query.mime) || req.accepts(Object.keys(handlers));
+
+		if (mimetype) {
+			res.locals.payload = await project.configuration.get(req.params.project);
+
+			res.set("Content-Type", mimetype);
+			await handlers[mimetype](req, res, next);
+		} else {
+			res.status(406).send();
+			next();
+		}
 	} catch (err) {
 		next(err);
 	}
-
-};
+}